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- Passenger Compartment Temp Sensor Circuit Short to Ground or Open

Diagnostic Fault Information

Circuit/System Description

The HVAC control module monitors the air temperature sensors with a low reference circuit and 5-volt signal circuit. The HVAC control module

monitors the voltage drop across the sensor. When the ambient air temperatures are cold, the resistance of the sensor is high and the voltage signals

are high. When the ambient air temperatures are hot, the resistance of the sensors is low and the voltage signals are low.

Conditions for Running the DTC

Ignition ON.

Conditions for Setting the DTC

* The HVAC control module detects the sensor signal circuit is less than -35掳C (-39掳F).

* The HVAC control module detects the sensor signal circuit is greater than 85掳C (185掳F).

Action Taken When the DTC Sets

The HVAC control module uses a default air temperature value for further automatic control calculations. The default values are not displayed on

the scan tool. The DIC will display the SERVICE A/C SYSTEM message.

Conditions for Clearing the DTC

* The DTC will become history if the HVAC control module no longer detects a failure.

* The history DTC will clear after 50 fault-free ignition cycles.

Reference Information

Schematic Reference

HVAC Schematics (See: Heating and Air Conditioning/Diagrams/Electrical Diagrams)

Connector End View Reference

Component Connector End Views (See: Diagrams/Connector Views)

Description and Operation

Automatic HVAC Description and Operation (See: Heating and Air Conditioning/Description and Operation/HVAC - Automatic)

Electrical Information Reference

* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/Circuit Testing/Circuit Testing)

* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/Connector Repairs/Connector Repairs)

* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/Circuit

Testing/Testing for Intermittent Conditions and Poor Connections)

* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/Wiring Repairs/Wiring Repairs)

Scan Tool Reference

Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information

Circuit/System Verification

Ignition ON, observe the appropriate scan tool Air Temp Sensor parameter. The reading should be between -35掳C (-39掳F) and 85掳C (185掳F) and

change with air temperature changes.

Circuit/System Testing

1. Ignition OFF, disconnect the harness connector at the appropriate air temperature sensor.

2. Ignition OFF, test for less than 10 ohms between the following low reference circuit terminal and ground.

* Inside air temperature sensor terminal 2.

* Ambient temperature sensor terminal B.

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Circuit/System Description

North America

The brake pedal position sensor is used to sense the action of the driver application of the brake pedal. The brake pedal position sensor provides an

analog voltage signal that will increase as the brake pedal is applied. The body control module (BCM) provides a low reference signal and a 5 V

reference voltage to the brake pedal position sensor. When the variable signal reaches a voltage threshold indicating the brakes have been applied,

the BCM will apply battery voltage to the right and left stop lamp control circuits, transmission control module (TCM), engine control module

(ECM), and center high mounted stop lamp (CHMSL) control circuit.

European

The brake pedal position sensor is used to sense the action of the driver application of the brake pedal. The brake pedal position sensor provides an

analog voltage signal that will increase as the brake pedal is applied. The body control module (BCM) provides a low reference signal and a 5 V

reference voltage to the brake pedal position sensor. When the variable signal reaches a voltage threshold indicating the brakes have been applied,

the BCM will apply battery voltage to stop lamp relay coil side control circuit, transmission control module (TCM), engine control module (ECM),

and center high mounted stop lamp (CHMSL). When the stop lamp relay receives battery voltage from the BCM, the relay coil is energized and the

stop lamp relay switch contacts close applying battery voltage from the STOP LAMPS fuse to illuminate the rear stop lamps and trailer stop lamps.

Conditions for Running the DTC

* Battery voltage must be between 9-16 V.

* Brakes APPLIED.

Conditions for Setting the DTC

DTC C0277 06 will set for the following conditions:

* The BCM detects a short to ground or an open/high resistance in the brake pedal position sensor signal circuit.

* The BCM detects a short to ground or an open/high resistance in the brake pedal position sensor 5 V reference circuit.

DTC C0277 07 will set for the following conditions:

* The BCM detects a short to battery voltage in the brake pedal position sensor signal circuit.

* The BCM detects an open/high resistance in the brake pedal position sensor low reference circuit.

C0277 09

The BCM detects the brake pedal position sensor signal is changing faster than possible under normal operating conditions.

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DTC P080A

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System

Check - Vehicle) prior to using this diagnostic procedure.

* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an

overview of the diagnostic approach.

* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure

Instructions)provides an overview of each diagnostic category.

DTC Descriptor

DTC P080A

- Clutch Pedal Position (CPP) Not Learned

Circuit/System Description

The clutch pedal position (CPP) is a three wire sensor, connected to a 5-volt reference circuit, a low reference circuit, and a signal circuit. The

engine control module (ECM) supplies 5-volts to the CPP sensor, and also provides a sensor ground path on the low reference circuit. The CPP

sensor sends a voltage signal to the ECM on the signal circuit. The voltage on the signal circuit will vary from a voltage less than or equal to 5-volts

when the clutch pedal is released to a voltage less than or equal to 1.5-volts when the clutch pedal is applied.

Conditions for Running the DTC

Clutch pedal fully applied.

Conditions for Setting the DTC

Clutch pedal position not learned.

Action Taken When the DTC Sets

P080A is a Type B DTC.

Conditions for Clearing the MIL/DTC

P080A is a Type B DTC.

Reference Information

Schematic Reference

Manual Transmission Schematics (See: Transmission and Drivetrain/Manual Transmission/Transaxle/Diagrams/Electrical Diagrams/Aisin AY6 -

Manual Transmission)

Connector End View Reference

Component Connector End Views (See: Diagrams/Connector Views)

Description and Operation

Transmission System Description and Operation (See: Transmission and Drivetrain/Manual Transmission/Transaxle/Description and

Operation/Aisin AY6 - Manual Transmission)

Electrical Information Reference

* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/Circuit Testing/Circuit Testing)

* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/Connector Repairs/Connector Repairs)

* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/Circuit

Testing/Testing for Intermittent Conditions and Poor Connections)

* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/Wiring Repairs/Wiring Repairs)

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions (See: Diagnostic Trouble Code Descriptions/Powertrain Diagnostic Trouble Code

(DTC) Type Definitions)

Scan Tool Reference

Control Module References (See: Testing and Inspection/Programming and Relearning)for scan tool information.

Circuit/System Verification

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* Driver roof rail module terminal B and SDM terminal 18 X2

* Passenger roof rail module terminal B and SDM terminal 54 X2

* Left side impact module terminal 1 and SDM terminal 14 X2

* Right side impact module terminal 1 and SDM terminal 15 X2

* Driver seat belt pretensioner terminal 2 and SDM terminal 10 X2

* Passenger seat belt pretensioner terminal 2 and SDM terminal 11 X2

瀚慖f greater than the specified range, test the control circuit for an open/high resistance.

12. If all circuits test normal, replace the SDM.

Repair Instructions

Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.

* Instrument Panel Inflatable Restraint Module Replacement (See: Restraints and Safety Systems/Air Bag Systems/Air Bag/Service and

Repair/Removal and Replacement/Instrument Panel Inflatable Restraint Module Replacement)

* Roof Side Rail Inflatable Restraint Module Replacement (See: Restraints and Safety Systems/Air Bag Systems/Air Bag/Service and

Repair/Removal and Replacement/Roof Side Rail Inflatable Restraint Module Replacement)

* Seat Belt Retractor Pretensioner Replacement - Front (W2E) (See: Restraints and Safety Systems/Seat Belt Systems/Seat Belt

Tensioner/Service and Repair/Removal and Replacement/Seat Belt Retractor Pretensioner Replacement - Front (W2E))Seat Belt Retractor

Pretensioner Replacement - Front (AQ9) (See: Restraints and Safety Systems/Seat Belt Systems/Seat Belt Tensioner/Service and

Repair/Removal and Replacement/Seat Belt Retractor Pretensioner Replacement - Front (AQ9))

* SIR/SRS Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/Wiring Repairs/SIR/SRS Wiring Repairs)

* Control Module References (See: Testing and Inspection/Programming and Relearning) for SDM replacement, setup, and programming

B0021

DTC B0014-B0045

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System

Check - Vehicle) prior to using this diagnostic procedure.

* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an

overview of the diagnostic approach.

* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure

Instructions) provides an overview of each diagnostic category.

DTC Descriptors

DTC B0014 01

- Driver Side Deployment Loop Short to Battery - Seat Air Bag

DTC B0014 02

- Driver Side Deployment Loop Short to Ground - Seat Air Bag

DTC B0014 04

- Driver Side Deployment Loop Open Circuit - Seat Air Bag

DTC B0014 0D

- Driver Side Deployment Loop Resistance Above Threshold - Seat Air Bag

DTC B0014 0E

- Driver Side Deployment Loop Resistance Below Threshold - Seat Air Bag

DTC B0015 01

- Driver Pretensioner Deployment Loop Short to Battery - Retractor

DTC B0015 02

- Driver Pretensioner Deployment Loop Short to Ground - Retractor

DTC B0015 04

- Driver Pretensioner Deployment Loop Open Circuit - Retractor

DTC B0015 0D

- Driver Pretensioner Deployment Loop Resistance Above Threshold - Retractor

DTC B0015 0E

- Driver Pretensioner Deployment Loop Resistance Below Threshold - Retractor

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DTC B3821 or B3824

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System

Check - Vehicle) prior to using this diagnostic procedure.

* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an

overview of the diagnostic approach.

* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure

Instructions) provides an overview of each diagnostic category.

DTC Descriptors

DTC B3821 00

- Left Rear Window Relay Power Circuit

DTC B3824 00

- Right Rear Window Relay Power Circuit

Diagnostic Fault Information

Circuit/System Description

The body control module (BCM) monitors the window lockout command from the driver door module (DDM). When the rear window switch

operation is authorized, the BCM signal voltage drops approximately 5 volts to the rear window switches allowing for normal window operation

from the rear switches. If the rear window lockout function is commanded, the BCM signal voltage is at B+ voltage which disables the rear window

switches and the rear windows will only operate when the BCM receives a command from the driver master control.

Conditions for Running the DTC

* Battery voltage is between 9-16 volts.

* The ignition is ON.

Conditions for Setting the DTC

B3821 00

The BCM detects a fault in the left rear window lockout circuit.

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* The fuel level is greater than 10 %.

* The throttle position (TP) is between 0-70 %.

* The DTCs run continuously when the above conditions are met for 3 s.

P2A00 or P2A03

* DTCs P0030, P0036, P0053, P0054, P0068, P0101, P0102, P0103, P0106, P0107, P0108, P0112, P0113, P0116, P0117, P0118, P0120,

P0121, P0122, P0123, P0128, P0131, P0132, P0133, P0134, P0135, P0137, P0138, P0140, P0141, P0171, P0172, P0174, P0175, P0201,

P0202, P0203, P0204, P0205, P0206, P0207, P0208, P0220, P0222, P0223, P0300, P0301, P0302, P0303, P0304, P0305, P0306, P0307,

P0308, P0442, P0443, P0446, P0449, P0455, P0496, P1133, P1516, P2101, P2119, P2135, P2176 are not set.

* The engine is running.

* The system voltage is between 10-32 V.

* The ECT Sensor parameter is more than 0掳C (32掳F).

* DTCs P2A00 and P2A03 run continuously when the above conditions are met.

Conditions for Setting the DTC

P0131, P0137, P0151, or P0157

* The ECM detects that the HO2S voltage is less than 50 mV.

* The DTCs set within 50 s when the above condition is met.

P0132, P0138, P0152, or P0158

* The ECM detects that the HO2S voltage is greater than 1,050 mV.

* The DTCs set within 50 s when the above condition is met.

P2A00 or P2A03

* The ECM detects that the Fuel Control Loop Status parameter is open.

* DTCs P2A00 and P2A03 set within 30 s when the above condition is met.

Action Taken When the DTC Sets

DTCs P0131, P0132, P0137, P0138, P0151, P0152, P0158, P2A00 and P2A03 are Type B DTCs.

Conditions for Clearing the MIL/DTC

DTCs P0131, P0132, P0137, P0138, P0151, P0152, P0158, P2A00 and P2A03 are Type B DTCs.

Reference Information

Schematic Reference

Engine Controls Schematics (LLT) (See: Diagrams/Electrical Diagrams/Powertrain Management/System Diagram)Engine Controls Schematics

(LF1) (See: Diagrams/Electrical Diagrams/Powertrain Management/System Diagram)

Connector End View Reference

Component Connector End Views (See: Diagrams/Connector Views)

Electrical Information Reference

* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/Circuit Testing/Circuit Testing)

* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/Connector Repairs/Connector Repairs)

* Heated Oxygen Sensor Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/Wiring Repairs/Heated

Oxygen Sensor Wiring Repairs)

* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/Circuit

Testing/Testing for Intermittent Conditions and Poor Connections)

* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/Wiring Repairs/Wiring Repairs)

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions (See: Diagnostic Trouble Code Descriptions/Powertrain Diagnostic Trouble Code

(DTC) Type Definitions)

Scan Tool Reference

Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information

Circuit/System Verification

1. Ignition ON, observe the DTC information with a scan tool. Verify no B52 HO2S heater DTCs are set.

瀚慖f a B52 HO2S heater DTC is set, refer to Diagnostic Trouble Code (DTC) List - Vehicle (See: Diagnostic Trouble Code

Descriptions/Diagnostic Trouble Code (DTC) List - Vehicle).

2. Engine running, observe the appropriate scan tool B52 HO2S voltage parameter. The reading should be within the range of 50-1,050 mV.

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DTC B2375 01

- Left Seat Assembly Horizontal Position Sensor Circuit Short to Battery

DTC B2375 06

- Left Seat Assembly Horizontal Position Sensor Circuit Short to Ground or Open

DTC B2375 5A

- Left Seat Assembly Horizontal Position Sensor Circuit Plausibility Failure

Diagnostic Fault Information

Circuit/System Description

The position sensor that set this diagnostic trouble code (DTC) is either attached to the seat directional motor drive cable or directly to the motor it

monitors. It receives a 5 V reference and low reference from the memory seat module (MSM). The sensor sends a voltage signal that varies with the

movement of the seat through the signal circuit to the MSM. Then based on this voltage signal, the MSM determines the position of the seat.

Conditions for Running the DTC

The MSM must be powered.

Conditions for Setting the DTC

B1825 01, B1850 01, B2355 01, B2365 01, or B2375 01

If the MSM sees the analog input from this sensor is greater than 4.75 V, the sensor will be considered out of range and the MSM will set this DTC.

B1825 06, B1850 06, B2355 06, B2365 06, or B2375 06

If the MSM sees the analog input from this sensor is less than 0.22 V, the sensor will be considered out of range and the MSM will set this DTC.

B1825 5A, B1850 5A, B2355 5A, B2365 5A, or B2375 5A

This DTC will set, if the MSM is controlling a motor in one direction and its position sensor is tracking the motor in the opposite direction. The

sensor is either mounted or wired incorrectly, or the polarity of the motor control circuits are reversed.

Action Taken When the DTC Sets

The MSM disables the memory recall and easy exit/entry action commands of the motor monitored by the sensor. The motor will respond to

manual positioning commands.

Conditions for Clearing the DTC

* The current DTC will clear and set to history, when the MSM sees the analog input from the sensor as between 0.22 V and 4.75 V and the

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B2652 - B3121

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Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.

* Driver or Passenger Seat Back Cushion Heater Replacement (KA1) (See: Body and Frame/Seats/Seat Temperature Element/Service and

Repair/Driver or Passenger Seat Back Cushion Heater Replacement (KA1))

* Driver Seat Cushion Heater Replacement (KA1) (See: Body and Frame/Seats/Service and Repair/Driver Seat Cushion Heater Replacement

(KA1))

* Passenger Seat Cushion Heater Replacement (KA1) (See: Body and Frame/Seats/Service and Repair/Passenger Seat Cushion Heater

Replacement (KA1))

* Control Module References (See: Testing and Inspection/Programming and Relearning) for MSM replacement, setup, and programming

B2509

DTC B2508 or B2509

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System

Check - Vehicle) prior to using this diagnostic procedure.

* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an

overview of the diagnostic approach.

* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure

Instructions) provides an overview of each diagnostic category.

DTC Descriptors

DTC B2508 01

- Seat Heater Relay Circuit Short to Battery

DTC B2508 02

- Seat Heater Relay Circuit Short to Ground

Diagnostic Fault Information

Circuit/System Description

The driver and passenger seat heating elements are controlled by a common high current relay internal to the memory seat module (MSM) and by

individual low side element control circuits. The MSM connects the heated seat heater element supply voltage circuits for both seats to a common

reference point. This reference point is biased to approximately 2.5 V. Before the MSM will allow heated seat operation, it checks to see if this

reference voltage is shorted to ground or voltage. Once the module verifies that it is not closing to a shorted heating element, it allows for heated

seat operation. The module will then continue to monitor the heating elements for a shorted circuit.

Conditions for Running the DTC

The MSM must be powered.

Conditions for Setting the DTC

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The ECM controls the heater by grounding the control circuit with a solid state device called a driver. The driver is equipped with a feedback

circuit that is pulled-up to voltage. The ECM can determine if the control circuit is open, shorted to ground, or shorted to a voltage by monitoring

the feedback voltage.

The HO2S utilizes the following circuits:

* A signal circuit

* A low reference circuit

* An ignition voltage circuit

* A heater control circuit

Conditions for Running the DTC

P0030, P0031, P0032, P0050, P0051, P0052

* The ignition voltage is between 10-18 volts.

* The engine speed is greater than 80 RPM, 240 RPM for LLT.

* The HO2S heater is commanded ON and OFF at least once during the ignition cycle.

* The HO2S heater is commanded ON-LLT only.

* The DTCs run continuously when the above conditions are met-5 seconds for LLT.

P0036, P0037, P0038, P0056, P0057, P0058

* The ignition voltage is between 10-18 volts.

* The engine speed is greater than 80 RPM.

* The HO2S heater is commanded ON and OFF at least once during the ignition cycle.

* The HO2S 2 is at operating temperature.

* The DTCs run continuously when the above conditions are met for greater than 500 mS.

Conditions for Setting the DTC

P0030, P0036, P0050, and P0056

The ECM detects an open in the heater circuits of the HO2S when the heater is commanded OFF. The condition exists for greater than 4 seconds or

a cumulative of 30 seconds.

P0031, P0037, P0051, and P0057

The ECM detects a short to ground in the heater circuits of the HO2S when the heater is commanded OFF. The condition exists for greater than 4

seconds or a cumulative of 30 seconds.

P0032, P0038, P0052, and P0058

The ECM detects a short to voltage in the heater circuits of the HO2S when the heater is commanded ON. The condition exists for greater than 4

seconds or a cumulative of 30 seconds.

Action Taken When the DTC Sets

DTCs P0030, P0031, P0032, P0036, P0037, P0038, P0050, P0051, P0052, P0056, P0057, and P0058 are Type B DTCs.

Conditions for Clearing the MIL/DTC

DTCs P0030, P0031, P0032, P0036, P0037, P0038, P0050, P0051, P0052, P0056, P0057, and P0058 are Type B DTCs.

Diagnostic Aids

* If the condition is intermittent, move the related harnesses and connectors, with the engine operating, while monitoring the scan tool Circuit

Test Status parameters for the component. The circuit status parameters change from OK or Not Run to Fault if there is a condition with the

circuit or a connection.

* An open fuse in the HO2S heater circuit may be caused by the heater element in one of the sensors. The condition may not be present until

the sensor operates for a period of time. If no fault is present in the heater circuit, monitor the amperage of each heater using the DMM to

determine if one of the heater elements is the cause of the open fuse. Inspect the sensor pigtail or the harness for contacting the exhaust

system.

Reference Information

Schematic Reference

Engine Controls Schematics (LLT) (See: Diagrams/Electrical Diagrams/Powertrain Management/System Diagram)Engine Controls Schematics

(LF1) (See: Diagrams/Electrical Diagrams/Powertrain Management/System Diagram)

Connector End View Reference

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Circuit/System Verification

1. Ignition ON, observe the scan tool DTC information. Verify no other DTC is set.

瀚慖f any other DTC is set, refer to Diagnostic Trouble Code (DTC) List - Vehicle (See: Diagnostic Trouble Code Descriptions/Diagnostic

Trouble Code (DTC) List - Vehicle).

2. Engine idling, observe the appropriate scan tool HO2S voltage parameter. The voltage should fluctuate above and below the range of

401-519 mV.

3. Observe the DTC information with a scan tool. DTC P013A, P013C, P013E, and P014A should not set.

4. Operate the vehicle within the Conditions for Running the DTC to verify the DTC does not reset. You may also operate the vehicle within the

conditions that you observed from the Freeze Frame/Failure Records data.

Circuit/System Testing

1. Ignition OFF, disconnect the harness connector at the appropriate HO2S.

2. Ignition ON, verify that the scan tool HO2S voltage parameter is between 400-520 mV.

瀚慖f less than the specified range, test the signal circuit terminal B for a short to ground. If the circuit/connections test normal, replace the

ECM.

瀚慖f greater than the specified range, test the signal circuit terminal B for a short to voltage. If the circuit/connections test normal, replace

the ECM.

3. Connect a 3 A fused jumper wire between the signal circuit terminal B and ground. Verify the scan tool HO2S voltage parameter is less than

60 mV.

瀚慖f greater than the specified range, test the signal circuit for an open/high resistance. If the circuit/connections test normal, replace the

ECM.

4. Connect a 3 A fused jumper wire between the signal circuit terminal B and the low reference circuit terminal A. Verify the scan tool HO2S

voltage parameter is less than 60 mV.

瀚慖f greater than the specified range, test the low reference circuit for an open/high resistance or for a short to voltage. If the

circuit/connections test normal, replace the ECM.

5. Verify that none of the following conditions exist:

* Lean or rich condition.

* Water intrusion in the HO2S harness connector

* HO2S wiring harness damage

* Incorrect RTV sealant

* Low or high fuel system pressure-Refer to Fuel System Diagnosis (See: Powertrain Management/Computers and Control

Systems/Testing and Inspection/Component Tests and General Diagnostics/Fuel System Diagnosis).

* Fuel that is contaminated-Refer to Alcohol/Contaminants-in-Fuel Diagnosis (with Special Tool) (See: Powertrain

Management/Computers and Control Systems/Testing and Inspection/Component Tests and General

Diagnostics/Alcohol/Contaminants-in-Fuel Diagnosis (with Special Tool))Alcohol/Contaminants-in-Fuel Diagnosis (without Special

Tool) (See: Powertrain Management/Computers and Control Systems/Testing and Inspection/Component Tests and General

Diagnostics/Alcohol/Contaminants-in-Fuel Diagnosis (without Special Tool)).

* Fuel saturation of the evaporative emission (EVAP) canister

* Exhaust leaks near the HO2S

* Engine vacuum leaks

* Engine oil consumption

* Engine coolant consumption

瀚慖f you find any of the above conditions, repair as necessary.

6. If all conditions test normal, replace the appropriate HO2S.

Repair Instructions

Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.

* Heated Oxygen Sensor Replacement - Bank 1 Sensor 2 (LF1) (See: Powertrain Management/Computers and Control Systems/Oxygen

Sensor/Service and Repair)Heated Oxygen Sensor Replacement - Bank 1 Sensor 2 (LLT) (See: Powertrain Management/Computers and

Control Systems/Oxygen Sensor/Service and Repair)

* Heated Oxygen Sensor Replacement - Bank 2 Sensor 2 (LF1) (See: Powertrain Management/Computers and Control Systems/Oxygen

Sensor/Service and Repair)Heated Oxygen Sensor Replacement - Bank 2 Sensor 2 (LLT) (See: Powertrain Management/Computers and

Control Systems/Oxygen Sensor/Service and Repair)

* Control Module References (See: Testing and Inspection/Programming and Relearning) for engine control module replacement, setup, and

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B1340 42

This DTC will set if the module calibration is not programmed.

B1340 4B

This DTC will set if the module calibration is not learned.

Action Taken When the DTC Sets

All movement related to the steering column motors are aborted.

Conditions for Clearing the DTC

* The current DTC will clear and set the code to history, 3 seconds after no motor movement is requested or the current is no longer

mismatched, and the power mode changes to OFF then back to ACC or RUN.

* The history DTC will clear after 50 consecutive fault-free ignition cycles have occurred.

Diagnostic Aids

The scan tool may reference the Memory Seat Module (MSM) as the Driver Position Module.

Reference Information

Schematic Reference

* Driver Seat Schematics (See: Body and Frame/Seats/Diagrams/Electrical Diagrams/Driver Seat Schematics)

* Tilt/Telescoping Steering Column Schematics (See: Diagrams/Electrical Diagrams/Steering/Steering Column/Tilt/Telescoping Steering

Column Schematics)

Connector End View Reference

Component Connector End Views (See: Diagrams/Connector Views)

Description and Operation

Memory Seats Description and Operation (See: Body and Frame/Seats/Description and Operation/Memory Seats)

Electrical Information Reference

* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/Circuit Testing/Circuit Testing)

* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/Connector Repairs/Connector Repairs)

* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/Circuit

Testing/Testing for Intermittent Conditions and Poor Connections)

* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/Wiring Repairs/Wiring Repairs)

Scan Tool Reference

Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information

Circuit/System Testing

B1340 0B

1. Ignition ON, use a scan tool to clear the current and history diagnostic trouble code.

2. Determine which motor set this DTC by operating the motors listed below one at a time in both directions. Check for the DTC to set between

each motor test.

* Steering Column Tilt motor

* Steering Column Telescope motor

3. Clear the diagnostic trouble codes.

4. Ignition OFF, disconnect the harness connector at the appropriate steering column motor for which the DTC set.

5. Ignition ON, operate the motor adjuster switch in both directions. DTC B1340 0B should not set.

瀚慖f the DTC sets, test for a short between the appropriate motor control circuits listed below. If the circuits test normal, replace the MSM.

* Steering column telescope motor terminal C and terminal D

* Steering column tilt motor terminal A and terminal B

6. Test the appropriate control circuits listed below for a high resistance. If the circuits test normal, test or replace the steering column.

* Steering column telescope motor terminal C and terminal D

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Scan Tool Reference

Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information

Circuit/System Verification

1. Verify that the following DTCs are not set: U1814, B1428.

瀚慖f either of the DTCs are set, refer to Diagnostic Trouble Code (DTC) List - Vehicle (See: Diagnostic Trouble Code

Descriptions/Diagnostic Trouble Code (DTC) List - Vehicle).

2. With a scan tool, access BCM, Power Mode data display list and compare all parameters listed with the corresponding ignition key position.

The PMM Power Mode Parameters table below illustrates the correct state of these input parameters in correspondence to the ignition switch

position. The circuits which the individual parameters are related to are in parentheses.

Circuit/System Testing

Important: You must perform the Circuit/System Verification before proceeding with Circuit/System Testing.

1. Connect a test lamp between each fuse test terminal of the ignition switch B+ circuit fuse and ground. The test lamp should illuminate.

瀚慖f the test lamp does not illuminate, test the circuits listed below for a short to ground. If all circuits test OK, replace the BCM.

* B+ terminal 2

* Ignition terminal 1

* Ignition terminal 3

* Ignition terminal 4

* Ignition, BCM terminal 19, X4

* Ignition, BCM terminal 21, X4

2. Disconnect the harness connector at the ignition switch.

3. Connect a test lamp between the B+ circuit terminal 2 and ground. The test lamp should illuminate.

瀚慖f the test lamp does not illuminate, test the B+ circuit for an open/high resistance.

Important: The ignition switch component test must be performed before proceeding with this test to verify the integrity of the

switch.

4. Perform the ignition switch component test. Verify the switch passes the test.

瀚慖f the ignition switch does not test normal, replace the ignition switch.

5. Disconnect the X1 harness connector at the BCM, test for less than 1.0 V between the circuit terminals of the BCM listed below and ground:

* Ignition terminal 4

* Ignition terminal 21

* Ignition terminal 21, X4

瀚慖f greater than specified, test the circuit for a short to voltage.

6. Test for less than 1.0 Ohms between the BCM and the ignition switch on the circuits listed below:

* Ignition terminal 2, X1 and ignition switch terminal 4

* Ignition terminal 21, X1 and ignition switch terminal 3

* Ignition terminal 21, X4 and ignition switch terminal 1

瀚慖f greater than specified, test the circuit for open/high resistance

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DTC B1055 02

- Audio Output 4 Right Rear Circuit Short to Ground (RR Door)

DTC B1055 04

- Audio Output 4 Right Rear Circuit Open (RR Door)

DTC B1065 01

- Audio Output 5 Circuit Short to Battery (Center IP)

DTC B1065 02

- Audio Output 5 Circuit Short to Ground (Center IP)

DTC B1065 04

- Audio Output 5 Circuit Open (Center IP)

DTC B1075 01

- Audio Output 6 Circuit Short to Battery (Subwoofer)

DTC B1075 02

- Audio Output 6 Circuit Short to Ground (Subwoofer)

DTC B1085 01

- Audio Output 7 Circuit Short to Battery (LR Shelf)

DTC B1085 02

- Audio Output 7 Circuit Short to Ground (LR Shelf)

DTC B1085 04

- Audio Output 7 Circuit Open (LR Shelf)

DTC B1095 01

- Audio Output 8 Circuit Short to Battery (RR Shelf)

DTC B1095 02

- Audio Output 8 Circuit Short to Ground (RR Shelf)

DTC B1095 04

- Audio Output 8 Circuit Open (RR Shelf)

DTC B1105 01

- Audio Output 9 Circuit Short to Battery (LF I/P Tweeter)

DTC B1105 02

- Audio Output 9 Circuit Short to Ground (LF I/P Tweeter)

DTC B1105 04

- Audio Output 9 Circuit Open (LF I/P Tweeter)

DTC B1115 01

- Audio Output 10 Circuit Short to Battery (RF I/P Tweeter)

DTC B1115 02

- Audio Output 10 Circuit Short to Ground (RF I/P Tweeter)

DTC B1115 04

- Audio Output 10 Circuit Open (RF I/P Tweeter)

Diagnostic Fault Information

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DTC B0014 0D

- Driver Side Deployment Loop Resistance Above Threshold - Seat Air Bag

DTC B0014 0E

- Driver Side Deployment Loop Resistance Below Threshold - Seat Air Bag

DTC B0015 01

- Driver Pretensioner Deployment Loop Short to Battery - Retractor

DTC B0015 02

- Driver Pretensioner Deployment Loop Short to Ground - Retractor

DTC B0015 04

- Driver Pretensioner Deployment Loop Open Circuit - Retractor

DTC B0015 0D

- Driver Pretensioner Deployment Loop Resistance Above Threshold - Retractor

DTC B0015 0E

- Driver Pretensioner Deployment Loop Resistance Below Threshold - Retractor

DTC B0016 01

- Left Roof Rail Deployment Loop Stage 1 Short to Battery

DTC B0016 02

- Left Roof Rail Deployment Loop Stage 1 Short to Ground

DTC B0016 04

- Left Roof Rail Deployment Loop Stage 1 Open Circuit

DTC B0016 0D

- Left Roof Rail Deployment Loop Stage 1 Resistance Above Threshold

DTC B0016 0E

- Left Roof Rail Deployment Loop Stage 1 Resistance Below Threshold

DTC B0019 01

- Passenger Frontal Deployment Loop Stage 1 Short to Battery

DTC B0019 02

- Passenger Frontal Deployment Loop Stage 1 Short to Ground

DTC B0019 04

- Passenger Frontal Deployment Loop Stage 1 Open Circuit

DTC B0019 0D

- Passenger Frontal Deployment Loop Stage 1 Resistance Above Threshold

DTC B0019 0E

- Passenger Frontal Deployment Loop Stage 1 Resistance Below Threshold

DTC B0020 01

- Passenger Frontal Deployment Loop Stage 2 Short to Battery

DTC B0020 02

- Passenger Frontal Deployment Loop Stage 2 Short to Ground

DTC B0020 04

- Passenger Frontal Deployment Loop Stage 2 Open Circuit

DTC B0020 0D

- Passenger Frontal Deployment Loop Stage 2 Resistance Above Threshold

DTC B0020 0E

- Passenger Frontal Deployment Loop Stage 2 Resistance Below Threshold

DTC B0021 01

- Passenger Side Deployment Loop Short to Battery - Seat Air Bag

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DTC B1085 01

- Audio Output 7 Circuit Short to Battery (LR Shelf)

DTC B1085 02

- Audio Output 7 Circuit Short to Ground (LR Shelf)

DTC B1085 04

- Audio Output 7 Circuit Open (LR Shelf)

DTC B1095 01

- Audio Output 8 Circuit Short to Battery (RR Shelf)

DTC B1095 02

- Audio Output 8 Circuit Short to Ground (RR Shelf)

DTC B1095 04

- Audio Output 8 Circuit Open (RR Shelf)

DTC B1105 01

- Audio Output 9 Circuit Short to Battery (LF I/P Tweeter)

DTC B1105 02

- Audio Output 9 Circuit Short to Ground (LF I/P Tweeter)

DTC B1105 04

- Audio Output 9 Circuit Open (LF I/P Tweeter)

DTC B1115 01

- Audio Output 10 Circuit Short to Battery (RF I/P Tweeter)

DTC B1115 02

- Audio Output 10 Circuit Short to Ground (RF I/P Tweeter)

DTC B1115 04

- Audio Output 10 Circuit Open (RF I/P Tweeter)

Diagnostic Fault Information

Circuit/System Description

Each of the audio output channel circuits (+) and (-) have a varying AC mV signal that is produced by the radio and sent to the amplifier. The

amplifier then processes these signals and passes the audio along with a DC bias voltage to the appropriate speakers. The audio being played on the

system is produced by the varying AC voltage. The AC voltage is what causes the speaker cone to move and produce sound. This voltage will vary

depending on what type of audio is being listened to, talk or music, and type of music, as well as the volume setting of the system. When using a

DMM, each of the audio amplifier output channel circuits will measure approximately 6.5V DC.

Conditions for Running the DTC

* The ignition is in the RUN or ACC position.

* The system voltage is at least 9.5 volts and no more than 15.5 volts.

* All the above conditions are present for greater than 10 seconds.

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DTC P06AC, P06AD, or P06AE

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System

Check - Vehicle) prior to using this diagnostic procedure.

* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an

overview of the diagnostic approach.

* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure

Instructions) provides an overview of each diagnostic category.

DTC Descriptors

DTC P06AC

- Transmission Control Module (TCM) Power Up Temperature Sensor Performance

DTC P06AD

- Transmission Control Module (TCM) Power Up Temperature Sensor Circuit Low Voltage

DTC P06AE

- Transmission Control Module (TCM) Power Up Temperature Sensor Circuit High Voltage

Circuit/System Description

The transmission control module (TCM) power up temperature sensor is located inside of the control solenoid valve assembly which has no

serviceable parts. The TCM power up temperature sensor provides the temperature of the TCM when the TCM power is on. This temperature

reading is used in various shifting and diagnostic routines and also to protect the control solenoid valve assembly and TCM. This fault is handled

inside the TCM and no external circuits are involved.

Conditions for Running the DTC

P06AC

* DTCs P06AC, P0716, P0717, P0722, or P0723 are not set.

* The engine speed is 500 RPM or greater for 5 seconds.

* The ignition voltage is 8.6 volts or greater.

* The TCM power up temperature is between -40 and +150掳C (-40 and +302掳F).

P06AD

* DTCs P06AD, P0716, P0717, P0722, or P0723 are not set.

* The transmission output shaft speed is 200 RPM or greater for 4 minutes.

* The torque converter clutch (TCC) slip speed is 120 RPM or greater for 4 minutes.

* The engine speed is 500 RPM or greater for 5 seconds.

* The ignition voltage is 8.6 volts or greater.

P06AE

* The engine speed is 500 RPM or greater for 5 seconds.

* The ignition voltage is 8.6 volts or greater.

* DTC P06AE has not failed set this ignition.

Conditions for Setting the DTC

P06AC - Condition 1

* Vehicle speed is greater than 8 km/h (5 mph) for 5 minutes.

* TCC slip speed is greater than 150 RPM for 5 minutes.

* The TCM power up temperature is between -40 and +150掳C (-40 and +302掳F).

* The TCM power up temperature has changed by less than 2掳C (3.6掳F) in 100 seconds.

* The transmission fluid temperature (TFT) is 70掳C (158掳F) or greater.

* The TFT has increased by 55掳C (99掳F) since start-up.

Condition 2

* Vehicle speed is 8 km/h (5 mph) or greater for 300 seconds cumulative.

* TCC slip speed is greater than 120 RPM for 300 seconds cumulative.

* The TCM temperature sensor is between 120-150掳C (248-302掳F).

* The TCM power up temperature has changed by less than 2掳C (3.6掳F) in 2 minutes.

* The TFT is 70掳C (158掳F) or greater.

* The TFT has increased by 55掳C (99掳F) since start-up.

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The liftgate module detects a short to ground in a liftgate motor control circuit.

B396A 04

The liftgate module detects an open/high resistance in a liftgate motor control circuit.

Action Taken When the DTC Sets

The power liftgate will only function in the manual mode.

Conditions for Clearing the DTC

* The DTC will be current for as long as the fault is present.

* When the fault is no longer present, the DTC will be a history DTC.

* A history DTC will clear after 50 ignition cycles.

Diagnostic Aids

Note: Before testing can be performed, the liftgate must be opened. Refer to Opening the Liftgate Without Electrical Power (See: Body and

Frame/Doors, Hood and Trunk/Trunk / Liftgate/Service and Repair/Procedures) for the appropriate procedure.

Note: DTC B396A 01 may set as current or history when the liftgate module detects erratic voltage levels in the electrical system and does not

affect the operation of the power liftgate. If this DTC is set and the liftgate functions normally, clear the DTC.

Whenever the liftgate module loses power or is disconnected, the ignition must be cycled OFF then ON in order to reactivate the liftgate module.

Reference Information

Schematic Reference

Liftgate Schematics (See: Body and Frame/Locks/Diagrams/Electrical Diagrams/Liftgate Schematics)

Connector End View Reference

Component Connector End Views (See: Diagrams/Connector Views)

Description and Operation

Liftgate Description and Operation (See: Body and Frame/Doors, Hood and Trunk/Trunk / Liftgate/Description and Operation/Liftgate

Description and Operation)

Electrical Information Reference

* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/Circuit

Testing/Testing for Intermittent Conditions and Poor Connections)

* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/Circuit Testing/Circuit Testing)

* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/Wiring Repairs/Wiring Repairs)

* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/Connector Repairs/Connector Repairs)

Scan Tool Reference

Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information

Circuit/System Verification

Ignition ON, doors UNLOCKED, observe the function of the liftgate while pressing the S46 liftgate handle switch, the liftgate latch should release

the liftgate and the liftgate should power OPEN.

Circuit/System Testing

1. Ignition OFF, disconnect the X1 harness connector at the K39 liftgate module.

2. Ignition ON, verify that a test lamp illuminates between the B+ circuit terminal 3 and ground.

瀚慖f the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance

3. Ignition OFF, connect the X1 harness connector at the K39 liftgate module and disconnect the harness connector at the M17 liftgate motor

assembly.

4. Test for less than 30k ohms between the control circuit terminal A and ground.

瀚慖f greater than the specified range, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal,

replace the K39 liftgate module.

5. Test for less than 30k ohms between the control circuit terminal B and ground.

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DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions (See: Diagnostic Trouble Code Descriptions/Powertrain Diagnostic Trouble Code

(DTC) Type Definitions)

Scan Tool Reference

Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information

Special Tools

* J 23738-A - Mityvac

* J 35555 - Metal Mityvac

* For equivalent regional tools, refer to Special Tools (See: Powertrain Management/Computers and Control Systems/Tools and Equipment).

Circuit/System Verification

1. Verify that DTC P0641, P0651, or P0697 is not set.

瀚慖f any of the DTCs are set refer to DTC P0641, P0651, P0697, or P06A3 (ECM, LF1) (See: P Code Charts/P0641).

2. Ignition ON, observe the scan tool MAP Sensor parameter. The reading should be between 0.20-4.80 V.

3. Operate the vehicle within the Conditions for Running the DTC to verify the DTC does not reset. You may also operate the vehicle within the

conditions that you observed from the Freeze Frame/Failure Records data.

Circuit/System Testing

1. Ignition OFF for 90 s, disconnect the harness connector at the B74 MAP sensor.

2. Test for less than 5 ohm between the low reference circuit terminal 2 and ground.

瀚慖f greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the K20

ECM.

3. Ignition ON, test for 4.8-5.2 V between the 5 V reference circuit terminal 1 and ground.

瀚慖f less than the specified range, test the 5 V reference circuit for a short to ground or an open/high resistance. If the circuit tests normal,

replace the K20 ECM.

瀚慖f greater than the specified range, test the 5 V reference circuit for a short to voltage. If the circuit tests normal, replace the K20 ECM.

4. Verify the scan tool MAP Sensor parameter is less than 1 kPa (0.2 psi).

瀚慖f greater than the specified range, test the signal circuit terminal 3 for a short to voltage. If the circuit tests normal, replace the K20 ECM.

5. Install a 3 A fused jumper wire between the signal circuit terminal 3 and the 5 V reference circuit terminal 1. Verify the scan tool MAP

Sensor parameter is greater than 127 kPa (18.4 psi).

瀚慖f less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace

the K20 ECM.

6. If the circuits test normal, test or replace the B74 MAP sensor.

Component Testing

Note: You must perform the Circuit/System Testing in order to verify the integrity of the MAP sensor circuits before proceeding with the

Component Testing.

Erratic Signal Test

1. Ignition OFF, remove the B74 MAP sensor.

2. Install a 3 A fused jumper wire between the 5 V reference circuit terminal 1 and the corresponding terminal of the B74 MAP sensor.

3. Install a jumper wire between the low reference circuit terminal 2 of the B74 MAP sensor and ground.

4. Install a jumper wire at terminal 3 of the B74 MAP sensor.

5. Connect a DMM between the jumper wire from terminal 3 of the B74 MAP sensor and ground.

6. Ignition ON, with the J 23738-A - Mityvac or the J 35555 - Metal Mityvac , slowly apply vacuum to the sensor while observing the voltage

on the DMM. The voltage should vary between 0-5 V without any spikes or dropouts.

瀚慖f the voltage reading is erratic, replace the B74 MAP sensor.

Repair Instructions

Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.

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Make sure the object alarm sensors located on the rear vehicle bumper are clear. Remove any snow, mud or ice that may be blocking the sensors.

Reference Information

Schematic Reference

Object Detection Schematics (See: Accessories and Optional Equipment/Collision Avoidance and Parking Assist Systems/Diagrams/Electrical

Diagrams)

Connector End View Reference

Component Connector End Views (See: Diagrams/Connector Views)

Description and Operation

Object Detection Description and Operation (UD7 with Display) (See: Accessories and Optional Equipment/Collision Avoidance and Parking

Assist Systems/Description and Operation/Object Detection Description and Operation (UD7 with Display))Object Detection Description and

Operation (UD7 Audio Only) (See: Accessories and Optional Equipment/Collision Avoidance and Parking Assist Systems/Description and

Operation/Object Detection Description and Operation (UD7 Audio Only))Object Detection Description and Operation (B3T) (See: Accessories

and Optional Equipment/Collision Avoidance and Parking Assist Systems/Description and Operation/Object Detection Description and Operation

(B3T))Object Detection Description and Operation (UVC) (See: Accessories and Optional Equipment/Collision Avoidance and Parking Assist

Systems/Description and Operation/Object Detection Description and Operation (UVC))

Electrical Information Reference

* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/Circuit Testing/Circuit Testing)

* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/Circuit

Testing/Testing for Intermittent Conditions and Poor Connections)

* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/Wiring Repairs/Wiring Repairs)

* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/Connector Repairs/Connector Repairs)

Scan Tool Reference

Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information

Circuit/System Verification

1. Verify that DTC B1E3A is not set.

瀚慖f the DTC is set, refer to DTC B1E3A (See: B Code Charts/B1E3A).

2. Verify that DTC B0958 3A, B0959 3A, B0960 3A, or B0961 3A is not set

瀚慖f DTC is set, replace the appropriate object alarm sensor.

3. Transmission in REVERSE, individually place a suitable object behind each sensor. Verify the appropriate scan tool Rear Region parameter

is between Zone 1 and Zone 4.

Circuit/System Testing

Single Object Alarm Sensor DTC Set

1. Ignition OFF, disconnect the harness connector at the appropriate object alarm sensor.

2. Ignition OFF for 30 seconds, test for less than 20 Ohms between the low reference circuit terminal 2 and ground.

瀚慖f greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the rear

object sensor control module.

3. Ignition ON, transmission in REVERSE, test for 8.0-9.0 V between the voltage reference circuit terminal 1 and ground.

瀚慖f greater than the specified range, test the voltage reference circuit for a short to voltage. If the circuit tests normal, replace the rear object

sensor control module.

瀚慖f less than the specified range, test the voltage reference circuit for a short to ground or an open/high resistance. If the circuit tests

normal, replace the rear object sensor control module.

4. Ignition OFF, remove the malfunctioning object alarm sensor and swap locations with another properly functioning object alarm sensor.

Connect the harness connector at both sensors.

5. Ignition ON, verify DTC is set for the new location in which the malfunctioning object alarm sensor is installed.

瀚慖f the DTC does not set for the new location, test the signal circuit terminal 3 for a short to voltage, short to ground, or an open/high

resistance. If the circuit tests normal, replace the rear object sensor control module.

6. If the DTC sets for the new location in which the malfunctioning object alarm sensor is installed, replace the appropriate object alarm sensor.

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Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information

Circuit/System Verification

Inspect for one tire that has improper air pressure or improper size.

C0267

DTC C0267

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System

Check - Vehicle) prior to using this diagnostic procedure.

* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an

overview of the diagnostic approach.

* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure

Instructions) provides an overview of each diagnostic category.

DTC Descriptor

DTC C0267 00

- Low Brake Fluid Indicated

Diagnostic Fault Information

Circuit/System Description

The brake fluid level switch monitors the level of brake fluid in the master cylinder. When the instrument panel cluster (IPC) sees the brake fluid

level switch input closed, it turns ON the Red Brake Warning indicator and sends a serial data message to the electronic brake control module

(EBCM) that the brake fluid level is low.

Conditions for Running the DTC

Ignition ON.

Conditions for Setting the DTC

* Low brake fluid is detected.

* A short to ground exists on the signal circuit.

Action Taken When the DTC Sets

* The EBCM disables the antilock brake system (ABS)/traction control system (TCS) dynamic rear proportion (DRP) and vehicle stability

enhancement system (VSES).

* A DIC message and/or a warning indicator may be displayed.

Conditions for Clearing the DTC

* The condition for the DTC is no longer present.

* The EBCM clears the history DTC when a current DTC is not detected in 100 consecutive drive cycles.

Reference Information

Schematic Reference

Hydraulic Brake Schematics (See: Brakes and Traction Control/Hydraulic System/Diagrams/Electrical Diagrams)

Connector End View Reference

Component Connector End Views (See: Diagrams/Connector Views)

Description and Operation

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P2729 - U2100

Control Module U Code List

Control Module U Code List

This list includes all Data Communications related U-code DTCs in alphanumeric order with descriptors for all modules. Not all DTCs listed will

be applicable to all vehicles.

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- Audio Output 8 Circuit Open (RR Shelf)

DTC B1105 01

- Audio Output 9 Circuit Short to Battery (LF I/P Tweeter)

DTC B1105 02

- Audio Output 9 Circuit Short to Ground (LF I/P Tweeter)

DTC B1105 04

- Audio Output 9 Circuit Open (LF I/P Tweeter)

DTC B1115 01

- Audio Output 10 Circuit Short to Battery (RF I/P Tweeter)

DTC B1115 02

- Audio Output 10 Circuit Short to Ground (RF I/P Tweeter)

DTC B1115 04

- Audio Output 10 Circuit Open (RF I/P Tweeter)

Diagnostic Fault Information

Circuit/System Description

Each of the audio output channel circuits (+) and (-) have a varying AC mV signal that is produced by the radio and sent to the amplifier. The

amplifier then processes these signals and passes the audio along with a DC bias voltage to the appropriate speakers. The audio being played on the

system is produced by the varying AC voltage. The AC voltage is what causes the speaker cone to move and produce sound. This voltage will vary

depending on what type of audio is being listened to, talk or music, and type of music, as well as the volume setting of the system. When using a

DMM, each of the audio amplifier output channel circuits will measure approximately 6.5V DC.

Conditions for Running the DTC

* The ignition is in the RUN or ACC position.

* The system voltage is at least 9.5 volts and no more than 15.5 volts.

* All the above conditions are present for greater than 10 seconds.

Conditions for Setting the DTC

B1025 01, B1035 01, B1045 01, B1055 01, B1065 01, B1075 01, B1085 01, B1095 01, B1105 01, B1115 01

The amplifier detects a short to voltage on the audio (+) or audio (-) circuit.

B1025 02, B1035 02, B1045 02, B1055 02, B1065 02, B1075 02, B1085 02, B1095 02, B1105 02, B1115 02

The amplifier detects a short to ground on the audio (+) or audio (-) circuit.

B1025 04, B1035 04, B1045 04, B1055 04, B1065 04, B1085 04, B1095 04, B1105 04, B1115 04

The amplifier detects an open on the audio (+) or audio (-) circuit.

Action Taken When the DTC Sets

The amplifier disables the audio output to the speaker with the current fault.

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ECM.

6. Remove the Camshaft Position Actuator Solenoid Valve. Verify the following conditions do not exist with the Camshaft Position Actuator

Solenoid Valve:

* Torn, restricted, mis-positioned, or missing screens at the CMP actuator solenoid

* Engine oil leak between the oil sealing lands of the CMP actuator solenoid. Inspect the lands of the CMP actuator solenoid for nicks.

* Oil seepage at the CMP actuator solenoid connector

瀚慖f a condition is found, replace Camshaft Position Actuator Solenoid Valve.

7. Ignition OFF, swap the Camshaft Position Actuator Solenoid Valve with a Camshaft Position Actuator Solenoid Valve that is operating

correctly.

Note: This step is testing the mechanical CMP actuator for the camshaft that set the DTC.

8. Engine idling. Command the appropriate Camshaft Position Actuator from 0 degrees to 40 degrees and back to zero while observing the

appropriate scan tool Camshaft Position Variance parameters. The Camshaft Position Variance should be less than 2 degrees in each of the

commanded states.

瀚慖f greater than the specified value, replace the mechanical camshaft position actuator.

9. If all circuits/connections test normal, test or replace the Camshaft Position Actuator Solenoid Valve.

Component Testing

1. Ignition OFF, disconnect the harness connector at the appropriate Camshaft Position Actuator Solenoid Valve.

2. Test for 7-12 ohm between the control terminal 2 and the ignition terminal 1 of the solenoid.

瀚慖f not within the specified range, replace the Camshaft Position Actuator Solenoid Valve.

3. Test for infinite resistance between each terminal and the solenoid housing.

瀚慖f not the specified value, replace the Camshaft Position Actuator Solenoid Valve.

Repair Instructions

Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.

* Camshaft Position Actuator Solenoid Valve Solenoid Replacement - Bank 1 (Right Side) Intake (See: Engine, Cooling and

Exhaust/Engine/Actuators and Solenoids - Engine/Variable Valve Timing Solenoid/Service and Repair/Camshaft Position Actuator Solenoid

Valve Solenoid Replacement - Bank 1 (Right Side) Intake)

* Camshaft Position Actuator Solenoid Valve Solenoid Replacement - Bank 1 (Right Side) Exhaust (See: Engine, Cooling and

Exhaust/Engine/Actuators and Solenoids - Engine/Variable Valve Timing Solenoid/Service and Repair/Camshaft Position Actuator Solenoid

Valve Solenoid Replacement - Bank 1 (Right Side) Exhaust)

* Camshaft Position Actuator Solenoid Valve Solenoid Replacement - Bank 2 (Left Side) Intake (See: Engine, Cooling and

Exhaust/Engine/Actuators and Solenoids - Engine/Variable Valve Timing Solenoid/Service and Repair/Camshaft Position Actuator Solenoid

Valve Solenoid Replacement - Bank 2 (Left Side) Intake)

* Camshaft Position Actuator Solenoid Valve Solenoid Replacement - Bank 2 (Left Side) Exhaust (See: Engine, Cooling and

Exhaust/Engine/Actuators and Solenoids - Engine/Variable Valve Timing Solenoid/Service and Repair/Camshaft Position Actuator Solenoid

Valve Solenoid Replacement - Bank 2 (Left Side) Exhaust)

* Camshaft Position Actuator Replacement - Bank 1 (Right Side) Intake (See: Engine, Cooling and Exhaust/Engine/Camshaft, Lifters and

Push Rods/Camshaft/Service and Repair/Camshaft Position Actuator Replacement - Bank 1 (Right Side) Intake)

* Camshaft Position Actuator Replacement - Bank 1 (Right Side) Exhaust (See: Engine, Cooling and Exhaust/Engine/Camshaft, Lifters and

Push Rods/Camshaft/Service and Repair/Camshaft Position Actuator Replacement - Bank 1 (Right Side) Exhaust)

* Camshaft Position Actuator Replacement - Bank 2 (Left Side) Intake (See: Engine, Cooling and Exhaust/Engine/Camshaft, Lifters and Push

Rods/Camshaft/Service and Repair/Camshaft Position Actuator Replacement - Bank 2 (Left Side) Intake)

* Camshaft Position Actuator Replacement - Bank 2 (Left Side) Exhaust (See: Engine, Cooling and Exhaust/Engine/Camshaft, Lifters and

Push Rods/Camshaft/Service and Repair/Camshaft Position Actuator Replacement - Bank 2 (Left Side) Exhaust)

* Control Module References (See: Testing and Inspection/Programming and Relearning) for ECM replacement, setup, and programming

P025A

DTC P025A

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System

Check - Vehicle) prior to using this diagnostic procedure.

* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an

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DTC Descriptor

DTC B1024 11

- Circuit Board Temperature Sensor Above Maximum Threshold

DTC B1024 53

- Circuit Board Temperature Sensor Low

DTC B1024 54

- Circuit Board Temperature Sensor High

Circuit/System Description

The internal module circuitry temperature is monitored. If the an over-heat condition which exceeds the maximum threshold of the internal circuitry

or a malfunctioning temperature sensor is detected, the module will shut down until the internal circuitry cools.

Conditions for Running the DTC

* The radio is in the ON or ACCY position

* The system voltage is at least 9 volts and no more than 16 volts.

Conditions for Setting the DTC

The module detects an over-heat condition or a malfunctioning sensor.

Action Taken When the DTC Sets

Module functionality is suspended.

Conditions for Clearing the DTC

* A current DTC clears when the module temperature returns to an acceptable level.

* A history DTC clears after 100 malfunction-free ignition cycles.

Diagnostic Aids

Extended use of extremely high volume, especially in warm weather conditions, may cause this DTC to set in the audio amplifier. Under these

conditions, it may be normal for this DTC to set to prevent permanent damage to the amplifier circuitry and no repair should be attempted.

Reference Information

Schematic Reference

Radio/Navigation System Schematics (See: Accessories and Optional Equipment/Diagrams/Electrical Diagrams/Radio/Navigation System

Schematics)

Connector End View Reference

Component Connector End Views (See: Diagrams/Connector Views)

Description and Operation

Radio/Audio System Description and Operation (See: Accessories and Optional Equipment/Description and Operation/Radio/Audio System

Description and Operation)

Electrical Information Reference

* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/Circuit Testing/Circuit Testing)

* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/Connector Repairs/Connector Repairs)

* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/Circuit

Testing/Testing for Intermittent Conditions and Poor Connections)

* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/Wiring Repairs/Wiring Repairs)

Circuit/System Verification

Verify that DTC B1024 is not set.

If the DTC is set, replace the appropriate control module that set the DTC.

Repair Instructions

Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.

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* The engine is not in decel fuel cut-off (DFCO).

* The HO2S 1 is at operating temperature for greater than 10 seconds.

* The internal HO2S 1 resistance is less than 10,000 ohms.

* The HO2S 1 heater is enabled for greater than 120 seconds.

* DTCs P0135 and P0155 run continuously once the above conditions are met for approximately 100 seconds.

P0141 or P0161

* Before the ECM can report DTC P0141 or P0161 failed, DTCs P0036, P0037, P0038, P0056, P0057, and P0058 must run and pass.

* DTCs P0137, P0138, P0140, P0157, P0158, or P0160 are not set.

* The engine speed is greater than 240 RPM.

* The ignition voltage is 10-18 volts.

* The intake air temperature (IAT) is greater than -30掳C (-22掳F).

* After the previous ignition cycle the engine OFF time was greater than 0 seconds.

* The calculated exhaust temperature is 300-750掳C (572-1,382掳F), 300-700掳C (572-1,292掳F) for LLT.

* The engine is not in decel fuel cut-off (DFCO).

* The internal HO2S 2 resistance is less than 10,000 ohms.

* The HO2S 2 heater is enabled for greater than 120 seconds.

* DTCs P0141 and P0161 run continuously once the above conditions are met for approximately 100 seconds.

Conditions for Setting the DTC

P0135 or P0155

The ECM detects that the internal resistance of the HO2S 1 heater is not within the expected range for greater than 12 seconds.

P0141 or P0161

The ECM detects that the internal resistance of the HO2S 2 heater is not within the expected range for greater than 6 seconds.

Action Taken When the DTC Sets

DTCs P0135, P0141, P0155, and P0161 are Type B DTCs.

Conditions for Clearing the MIL/DTC

DTCs P0135, P0141, P0155, and P0161 are Type B DTCs.

Reference Information

Schematic Reference

Engine Controls Schematics (LLT) (See: Diagrams/Electrical Diagrams/Powertrain Management/System Diagram)Engine Controls Schematics

(LF1) (See: Diagrams/Electrical Diagrams/Powertrain Management/System Diagram)

Connector End View Reference

Component Connector End Views (See: Diagrams/Connector Views)

Electrical Information Reference

* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/Circuit Testing/Circuit Testing)

* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/Connector Repairs/Connector Repairs)

* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/Circuit

Testing/Testing for Intermittent Conditions and Poor Connections)

* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/Wiring Repairs/Wiring Repairs)

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions (See: Diagnostic Trouble Code Descriptions/Powertrain Diagnostic Trouble Code

(DTC) Type Definitions)

Scan Tool Reference

Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information

Circuit/System Verification

Note: It may take up to 8 minutes for the DTC to set.

1. With the engine at normal operating temperature, operate the engine above 1,200 RPM for 2 minutes and then allow the engine to idle. DTCs

P0135, P0141, P0155, or P0161 should not set.

2. Operate the vehicle within the Conditions for Running the DTC to verify the DTC does not reset. You may also operate the vehicle within the

conditions that you observed from the Freeze Frame/Failure Records data.

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* Driver roof rail module terminal B

* Passenger roof rail module terminal A

* Left side impact module terminal 1

* Right side impact module terminal 1

* Driver seat belt pretensioner terminal 2

* Passenger seat belt pretensioner terminal 2

瀚慖f greater than the specified range, test the circuit control for a short to voltage.

8. Ignition OFF, test for infinite resistance between the appropriate high control circuit terminal and ground.

* I/P module Stage 1 terminal 1 X1

* I/P module Stage 2 terminal 2 X2

* Driver roof rail module terminal A

* Passenger right roof rail module terminal A (RHD)

* Passenger right roof rail module terminal B

* Left side impact module terminal 2

* Right side impact module terminal 2

* Driver seat belt pretensioner terminal 1

* Passenger seat belt pretensioner terminal 1

瀚慖f not the specified value, test the control circuit for a short to ground.

9. Test for infinite resistance between the appropriate low control circuit terminal and ground.

* I/P module Stage 1 terminal 2 X1

* I/P module Stage 2 terminal 1 X2

* Driver roof rail module terminal B

* Passenger roof rail module terminal A

* Left side impact module terminal A

* Right side impact module terminal A

* Driver seat belt pretensioner terminal 1

* Passenger seat belt pretensioner terminal 1

瀚慖f not the specified value, test the control circuit for a short to ground.

10. Test for less than 1 ohm between the following high control circuit terminals.

* I/P module Stage 1 terminal 1 X1 and SDM terminal 5

* I/P module Stage 2 terminal 2 X2 and SDM terminal 8

* Driver roof rail module terminal A and SDM terminal 17 X2

* Passenger roof rail module terminal A and SDM terminal 53 X2

* Left side impact module terminal 2 and SDM terminal 13 X2

* Right side impact module terminal 2 and SDM terminal 16 X2

* Driver seat belt pretensioner terminal 1 and SDM terminal 9 X2

* Passenger seat belt pretensioner terminal 1 and SDM terminal 12 X2

瀚慖f greater than the specified range, test the control circuit for an open/high resistance.

11. Test for less than 1 ohm between the following low control circuit terminals.

* I/P module Stage 1 terminal 2 X1 and SDM terminal 6

* I/P module Stage 2 terminal 1 X2 and SDM terminal 7

* Driver roof rail module terminal B and SDM terminal 18 X2

* Passenger roof rail module terminal B and SDM terminal 54 X2

* Left side impact module terminal 1 and SDM terminal 14 X2

* Right side impact module terminal 1 and SDM terminal 15 X2

* Driver seat belt pretensioner terminal 2 and SDM terminal 10 X2

* Passenger seat belt pretensioner terminal 2 and SDM terminal 11 X2

瀚慖f greater than the specified range, test the control circuit for an open/high resistance.

12. If all circuits test normal, replace the SDM.

Repair Instructions

Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.

* Instrument Panel Inflatable Restraint Module Replacement (See: Restraints and Safety Systems/Air Bag Systems/Air Bag/Service and

Repair/Removal and Replacement/Instrument Panel Inflatable Restraint Module Replacement)

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* Fuel Injector 3 terminal 9 X117

* Fuel Injector 4 terminal 4 X116

* Fuel Injector 5 terminal 10 X117

* Fuel Injector 6 terminal 6 X116

4. Crank or start the engine while observing the test lamp. The test lamp should flash several times and then stop when the DTC sets.

Note: Four of the injector high voltage supply circuits are paired in the controller with a dual driver, refer to Diagnostic Aids.

瀚慖f the test lamp is always ON, test the high voltage supply circuit for a short to voltage. If the circuit tests normal, replace the ECM.

瀚慖f the test lamp is always OFF, test the high voltage supply circuit for a short to ground or an open/high resistance. If the circuit tests

normal, replace the ECM.

5. Clear the DTC information with a scan tool, then cycle the ignition OFF.

6. Connect a test lamp between B+ and the high voltage control circuit terminal of the appropriate injector listed below.

* Fuel Injector 1 terminal 2 X117

* Fuel Injector 2 terminal 1 X116

* Fuel Injector 3 terminal 3 X117

* Fuel Injector 4 terminal 3 X116

* Fuel Injector 5 terminal 4 X117

* Fuel Injector 6 terminal 5 X116

7. Ignition ON, the test lamp should not illuminate.

瀚慖f the test lamp is ON, test the high voltage control circuit for a short to ground. If the circuit tests normal, replace the ECM.

8. Connect a test lamp between ground and the high voltage control circuit terminal of the appropriate injector listed below.

* Fuel Injector 1 terminal 2 X117

* Fuel Injector 2 terminal 1 X116

* Fuel Injector 3 terminal 3 X117

* Fuel Injector 4 terminal 3 X116

* Fuel Injector 5 terminal 4 X117

* Fuel Injector 6 terminal 5 X116

9. Ignition ON, the test lamp should not illuminate.

瀚慖f the test lamp is ON, test the high voltage control circuit for a short to voltage. If the circuit tests normal, replace the ECM.

10. Clear the DTC information with a scan tool, then cycle the ignition OFF.

11. Ignition OFF, connect a test lamp between the high voltage supply circuit terminal and the high voltage control circuit terminal of the

appropriate injector listed below.

* Fuel Injector 1 terminal 8 and terminal 2 X117

* Fuel Injector 2 terminal 2 and terminal 1 X116

* Fuel Injector 3 terminal 9 and terminal 3 X117

* Fuel Injector 4 terminal 4 and terminal 3 X116

* Fuel Injector 5 terminal 10 and terminal 4 X117

* Fuel Injector 6 terminal 6 and terminal 5 X116

12. Crank or start the engine while observing the test lamp. The test lamp should flash several times and then stop when the DTC sets.

瀚慖f the test lamp does not flash, test the high voltage control circuit for an open/high resistance. If the circuit tests normal, replace the

ECM.

Note: Testing for the following steps is performed on the fuel injector side of the multi-way harness connector. It may be necessary to

remove the intake manifold to isolate the condition.

13. Ignition OFF, measure the resistance between the appropriate high voltage supply circuit and ground. The DMM should display OL ohm.

瀚慖f less than the specified range, test the high voltage supply circuit and the high voltage control circuit for a short to ground. If the

circuits/connections test normal, test or replace the appropriate fuel injector(s).

14. Test for 1.5-2.5 ohm between the appropriate high voltage supply circuit and the high voltage control circuit.

瀚慖f less than the specified range, test for a short between the high voltage supply circuit and the high voltage control circuit. If the

circuits/connections test normal, test or replace the appropriate fuel injector(s).

瀚慖f greater than the specified range, test the high voltage supply circuit and the high voltage control circuit for an open/high resistance. If

the circuits/connections test normal, test or replace the appropriate fuel injector.

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Circuit/System Description

The memory seat module (MSM) controls the seat, recline, lumbar, and steering column motors via half bridges that are divided into 2 groups that

are connected to separate power rails internal to the module. The MSM connects all of the motor control circuits on each power rail to a common

reference point whenever they are not in operation. This reference point is biased to approximately 2.5 volts. The MSM checks to see if this

reference voltage is shorted to ground or battery before enabling any seat, lumbar, or steering column motor.

Conditions for Running the DTC

The MSM must be powered.

Conditions for Setting the DTC

B3920 01

The voltage on any power rail 1 motor control circuit exceeds 2.78 volts for 100 ms.

B3920 02

The voltage on any power rail 1 motor control circuit is below 1.47 volts for 100 ms.

B3921 01

The voltage on any power rail 2 motor control circuit exceeds 2.78 volts for 100 ms.

B3921 02

The voltage on any power rail 2 motor control circuit is below 1.47 volts for 100 ms.

Action Taken When the DTC Sets

The MSM will not allow operation of any motor on the power rail for which the DTC was set.

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Circuit/System Description

Without RPO UAV

The vehicle communication interface module (VCIM) uses the cellular phone microphone to allow driver communication with OnStar.

With RPO UAV

The vehicle communication interface module (VCIM) and navigation radio use the cellular phone microphone to allow driver communication with

OnStar, as well as to operate the voice recognition/voice guidance feature of the navigation radio.

Conditions for Running the DTC

* The ignition must be in the RUN or ACC position.

* The system voltage is at least 9.5 volts and no more than 15.5 volts.

* All the above conditions are present for greater than 10 seconds.

Conditions for Setting the DTC

B2455 01

A short to battery is detected on the cellular microphone signal circuit

B2455 02

A short to ground is detected on the cellular microphone signal circuit

B2455 04

A open circuit is detected on the cellular microphone signal circuit

Action Taken When the DTC Sets

* The VCIM and/or navigation radio (RPO UAV) will not receive any signal from the microphone.

* The OnStar status LED turns red.

* Voice recognition will be inoperative

Conditions for Clearing the DTC

* A current DTC clears when the condition for setting the DTC is no longer present.

* A history DTC clears after 50 malfunction-free ignition cycles.

Reference Information

Schematic Reference

OnStar Schematics (See: Accessories and Optional Equipment/Diagrams/Electrical Diagrams/OnStar Schematics)

Connector End View Reference

Component Connector End Views (See: Diagrams/Connector Views)

Description and Operation

OnStar Description and Operation (See: Accessories and Optional Equipment/Description and Operation/OnStar Description and Operation)

Electrical Information Reference

* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/Circuit Testing/Circuit Testing)

* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/Connector Repairs/Connector Repairs)

* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/Circuit

Testing/Testing for Intermittent Conditions and Poor Connections)

* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/Wiring Repairs/Wiring Repairs)

Circuit/System Testing

Without RPO UAV

1. Ignition OFF, disconnect the harness connector at the cellular microphone.

2. Ignition OFF, test for less than 5 ohms between the low reference circuit terminal A and ground.

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* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System

Check - Vehicle) prior to using this diagnostic procedure.

* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an

overview of the diagnostic approach.

* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure

Instructions) provides an overview of each diagnostic category.

DTC Descriptors

DTC P182E

- Internal Mode Switch - Invalid Range

DTC P1915

- Internal Mode Switch Does Not Indicate Park/Neutral (P/N) During Start

Diagnostic Fault Information

Typical Scan Tool Data

Circuit/System Description

The manual shift detent lever with shaft position switch assembly or internal mode switch (IMS) assembly is a sliding contact switch attached to the

control valve body within the transmission. The 4 inputs to the transmission control module (TCM) from the switch indicate which position is

selected by the transmission manual shaft. The input voltage at the TCM is high when the switch is open and low when the switch is closed to

ground. The state of each input is displayed on the scan tool as IMS. The IMS input parameters represented are transmission range signal A, Signal

B, signal C, and signal P.

Conditions for Running the DTC

P182E

* The engine speed is greater than 400 RPM for 5 seconds.

* The ignition voltage is greater than 8.6 volts.

* Engine torque signal is valid.

* DTCs P0101, P0102, P0103, P0106, P0107, P0108, P0171, P0171, or P0172 are not set.

P1915

* No OSS DTCs P0722 or P0723 and are not Fault Active or Test Fail this Key ON.

* The transmission output shaft speed is less than 90 RPM or less.

* The ignition voltage is between 6.0 volts and 18.0 volts.

Conditions for Setting the DTC

P182E

The IMS does not indicate a valid Park, Reverse, Neutral or Drive Range gear position for 7 seconds.

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(LF1) (See: Diagrams/Electrical Diagrams/Powertrain Management/System Diagram)

Connector End View Reference

Component Connector End Views (See: Diagrams/Connector Views)

Description and Operation

Fuel System Description (See: Powertrain Management/Computers and Control Systems/Description and Operation/Fuel System Description)

Electrical Information Reference

* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/Circuit Testing/Circuit Testing)

* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/Connector Repairs/Connector Repairs)

* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/Circuit

Testing/Testing for Intermittent Conditions and Poor Connections)

* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/Wiring Repairs/Wiring Repairs)

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions (See: Diagnostic Trouble Code Descriptions/Powertrain Diagnostic Trouble Code

(DTC) Type Definitions)

Scan Tool Reference

Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information

Circuit/System Verification

1. Observe the DTC information with a scan tool. DTC P0685 or P1682 should not set.

瀚慖f a DTC is set, refer to Diagnostic Trouble Code (DTC) List - Vehicle (See: Diagnostic Trouble Code Descriptions/Diagnostic Trouble

Code (DTC) List - Vehicle).

2. Engine operating, observe the DTC information with a scan tool. DTC P1248, P1249, P124A, P124B, P124C, or P124D should not set.

3. Observe the scan tool Current Misfire Counter parameters. The Current Misfire Counters should not increment.

4. Ignition ON, observe the scan tool Cylinder 1-6 Injector Control Circuit Status parameters. Verify the Injector Control Circuit Status

parameters display OK.

5. Operate the vehicle within the Conditions for Running the DTC to verify the DTC does not reset. You may also operate the vehicle within the

conditions that you observed from the Freeze Frame/Failure Records data.

Circuit/System Testing

1. Ignition OFF, disconnect the appropriate multi-way harness connector X109 or X110, at the rear of the intake manifold.

2. Ignition ON, observe the appropriate scan tool Cylinder 1-6 Injector Control Circuit Status. The parameter should display Open.

瀚慖f not the specified value, test the appropriate high voltage supply circuit, ECM side, for a short to ground or the appropriate high voltage

control circuit, ECM side, for a short to voltage. If the circuits test normal, replace the K20 ECM.

3. Ignition ON, connect a test lamp between the appropriate high voltage supply circuit and the high voltage control circuit. The Injector

Control Circuit Status should transition from Open to OK.

瀚慖f not the specified value, test for the following conditions in the ECM side of the harness:

* An open/high resistance in the high voltage supply circuit

* An open/high resistance in the high voltage control circuit

* A short to ground in the high voltage control circuit

* A short to voltage in the high voltage supply circuit

瀚慖f the circuits test normal, replace the K20 ECM.

Note: Testing for the following steps is performed on the fuel injector side of the multi-way harness connector. It may be necessary to

remove the intake manifold to isolate the condition.

4. Ignition OFF, measure the resistance between the appropriate high voltage supply circuit and ground. The DMM should display OL ohm.

瀚慖f less than the specified range, test the high voltage supply circuit and the high voltage control circuit for a short to ground. If the

circuits/connections test normal, test or replace the appropriate Q17 fuel injector(s).

5. Test for 2-3 ohm between the appropriate high voltage supply circuit and high voltage control circuit.

瀚慖f less than the specified range, test for a short between the high voltage supply circuit and high voltage control circuit. If the

circuits/connections test normal, test or replace the appropriate Q17 fuel injector(s).

瀚慖f greater than the specified range, test the high voltage supply circuit and high voltage control circuit for an open/high resistance. If the