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2010 Cadillac CTS Sedan AWD V6-3.6L Page 381

- Device Ignition 1 (ON and START) Circuit Short to Battery

DTC B1370 06

- Device Ignition 1 (ON and START) Circuit Short to Ground or Open

DTC B1380 01

- Device Ignition ACCESSORY Circuit Short to Battery

DTC B1380 06

- Device Ignition ACCESSORY Circuit Short to Ground or Open

DTC B1440 00

- Power Mode Master Input Circuits Mismatch

DTC B1441 01

- Device Ignition OFF, RUN, and CRANK Circuit Short to Battery

DTC B1441 06

- Device Ignition OFF, RUN, and CRANK Circuit Short to Ground or Open

Diagnostic Fault Information

Circuit/System Description

The vehicle power mode master (PMM) is the body control module (BCM). The ignition switch is a low current switch with multiple discrete

ignition switch signals to the PMM for determination of the power mode. The PMM receives the ignition switch signals, and additionally a

reference voltage signal from the BCM, through the ignition switch, and back to the BCM. There are redundancies within the PMM system that can

allow operation of certain subsystems when there are faults in the ignition switch circuits. Other information such as serial data input from other

modules and DTCs is also used to determine what power mode signals and information is transmitted by the PMM. The BCM logic uses all this

information to identify the operator's desired power mode and activate specific discrete signals, and serial data messages for the operation of

different subsystems as necessary. Other modules which have switched voltage inputs may operate in a default mode if the PMM serial data

message does not match what the individual module can detect from its own connections.

The PMM will activate relays and other direct outputs of the PMM as needed according to the calculated power mode. Some relays controlled by

the BCM are switched ignition voltage outputs that are pass through circuits within the BCM directly from the ignition switch. If these circuits short

to ground, the B+ circuit fuse to the ignition switch will open.

Conditions for Running the DTC

B1370 01

Ignition switch is in the OFF or ACC positions.

B1370 06, B1380 01, B1441 01, B1441 06

Ignition switch is in the START position.

B1380 06, B1440 00

Ignition switch is in the RUN position.

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2010 Cadillac CTS Sedan AWD V6-3.6L Page 822

Action Taken When the DTC Sets

* DTCs P06AC, P06AD, and P06AE are Type C DTCs.

* The TCM allows the vehicle to operate in transmission protection mode.

Conditions for Clearing the DTC

DTCs P06AC, P06AD, and P06AE are Type C DTCs.

Diagnostic Aids

During a road test, the TCM Power-Up temperature should steadily increase to a normal operating temperature, and then stabilize.

Reference Information

Schematic Reference

Automatic Transmission Controls Schematics (See: Transmission and Drivetrain/Automatic Transmission/Transaxle/Diagrams)

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)

Description and Operation

Electronic Component Description (See: Transmission and Drivetrain/Automatic Transmission/Transaxle/Description and Operation/Electronic

Component Description)

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, clear the DTCs with a scan tool.

2. Operate the vehicle at 64 km/h (40 mph) for 10 minutes. Monitor the TCM Power-Up Temperature parameter and the TCM Temperature

parameter with a scan tool. The TCM Power-Up Temperature parameter and the TCM Temperature parameter should be within 10掳C (18掳F)

of each other.

瀚慖f the TCM Power-Up Temperature parameter is not within the specified value of the TCM Temperature parameter, then replace the Q8

control solenoid valve assembly.

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.

Repair Instructions

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

* Control solenoid valve assembly replacement. Refer to Control Module References (See: Testing and Inspection/Programming and

Relearning) for replacement, setup, and programming.

* Perform the Service Fast Learn Adapts (See: Transmission and Drivetrain/Automatic Transmission/Transaxle/Testing and

Inspection/Programming and Relearning/Service Fast Learn Adapts) following all transmission related repairs.

P06AD

DTC P06AC, P06AD, or P06AE

Diagnostic Instructions

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2010 Cadillac CTS Sedan AWD V6-3.6L Page 90

the deployment loop in order to deploy an inflatable restraint module. There are 2 shorting bars used within the module connector which will short

together both high and low circuits, when the connector is disconnected. This will help to prevent unwanted deployment of the inflator module

during servicing.

Conditions for Running the DTC

Ignition voltage is between 9-16 V.

Conditions for Setting the DTC

B0014 01, B0015 01, B0016 01, B0019 01, B0020 01, B0021 01, B0022 01, B0023 01

The inflatable restraint module high and/or low circuit is shorted to voltage for 120 milliseconds.

B0014 02, B0015 02, B0016 02, B0019 02, B0020 02, B0021 02, B0022 02, B0023 02

The inflatable restraint module high and/or low circuit is shorted to ground for 120 milliseconds.

B0014 04, B0015 04, B0016 04, B0019 04, B0020 04, B0021 04, B0022 04, B0023 04

The inflatable restraint module high and/or low circuit is open for 120 milliseconds.

B0014 0D, B0015 0D, B0016 0D, B0019 0D, B0020 0D, B0021 0D, B0022 0D, B0023 0D

The inflatable restraint module deployment loop resistance is greater than 3.9 ohm for 120 milliseconds.

B0014 0E, B0015 0E, B0016 0E, B0019 0E, B0020 0E, B0021 0E, B0022 0E, B0023 0E

The inflatable restraint module deployment loop resistance is less than 1.1 ohm for 120 milliseconds.

Action Taken When the DTC Sets

* The SDM requests the instrument panel cluster (IPC) to illuminate the AIR BAG indicator ON.

* The SDM will store a DTC, however if an event occurs the system will still attempt deployments.

Conditions for Clearing the DTC

* The condition for setting the DTC no longer exists.

* A history DTC will clear once 100 malfunction-free ignition cycles have occurred.

Reference Information

Schematic Reference

SIR Schematics (See: Diagrams/Electrical Diagrams/Air Bag Systems)

Connector End View Reference

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

Description and Operation

SIR System Description and Operation (See: Restraints and Safety Systems/Air Bag Systems/Description and Operation/SIR System Description

and Operation)

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

Special Tools

* J 38715-A SIR Driver/Passenger Load Tool

* SA9409Z-A SIR Driver/Passenger Load Tool

Circuit/System Testing

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2010 Cadillac CTS Sedan AWD V6-3.6L Page 918

Circuit Description

The heated oxygen sensor (HO2S) heater reduces the time required for the oxygen sensor to reach operating temperature and maintains the

operating temperature during extended idle periods. When the ignition is turned to the ON position, ignition voltage is supplied directly to the

sensor heater. The engine control module (ECM) controls the heater operation by first modulating the control circuit to ground when the sensors are

cold. This prevents the possibility of thermal shock to the sensor, from condensation build-up on the sensor, by controlling the sensors rate of

heating. After a predetermined amount of time, the ECM commands the heaters ON continuously. Once the sensor reaches operating temperature,

the ECM may modulate the heater control circuit to ground, to maintain a desired temperature.

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.

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Component Testing

1. Remove the intake manifold and disconnect the appropriate fuel injector.

2. Verify the resistance of each fuel injector with one of the following methods:

* If the engine coolant temperature (ECT) sensor is between 10-32掳C (50-90掳F), the resistance of each fuel injector should be 1.25-1.75

ohm.

瀚慖f not within the specified range, replace the fuel injector.

* If the ECT sensor is not between 10-32掳C (50-90掳F), measure and record the resistance of each fuel injector with a DMM. Subtract the

lowest resistance value from the highest resistance value. The difference between the lowest value and the highest value should be equal

to or less than 0.45 ohm.

瀚慖f the difference is more than 0.45 ohm, add all of the fuel injector resistance values to obtain a total resistance value. Divide the total

resistance value by the number of fuel injectors to obtain an average resistance value. Subtract the lowest individual fuel injector

resistance value from the average resistance value. Compute the difference between the highest individual fuel injector resistance

value and the average resistance value. Replace the fuel injector that displays the greatest difference above or below the average.

Repair Instructions

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

* Fuel Injector Replacement (See: Powertrain Management/Fuel Delivery and Air Induction/Fuel Injector/Service and Repair/Fuel Injector

Replacement)

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

P0204

DTC P0201-P0206, P0261, P0262, P0264, P0265, P0267, P0268, P0270, P0271, P0273, P0274, P0276, P0277, P2146, P2149, P2152, P2155,

P216A, or P216D (w/LLT)

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 P0201

- Cylinder 1 Injector Control Circuit

DTC P0202

- Cylinder 2 Injector Control Circuit

DTC P0203

- Cylinder 3 Injector Control Circuit

DTC P0204

- Cylinder 4 Injector Control Circuit

DTC P0205

- Cylinder 5 Injector Control Circuit

DTC P0206

- Cylinder 6 Injector Control Circuit

DTC P0261

- Cylinder 1 Injector Control Circuit Low Voltage

DTC P0262

- Cylinder 1 Injector Control Circuit High Voltage

DTC P0264

- Cylinder 2 Injector Control Circuit Low Voltage

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Note: The connector and connector position assurance (CPA) may seat independent of each other. Both the connector and CPA should seat

with an audible and/or tactile click. The CPA isolates the shorting-bars within the connector allowing the deployment circuit to operate

properly.

1. Verify that the appropriate inflator restraint module connector and the CPA are engaged.

瀚慖f the connector or CPA is not properly engaged, make the appropriate repair.

2. Ignition OFF, disconnect the harness connector at the appropriate inflator restraint module.

3. With the appropriate load tool adaptor, connect J 38715-A in place of the inflator restraint module.

4. Ignition ON, with a scan tool, verify DTC is set as current.

瀚慖f the DTC is not set or is set as history, cycle ignition OFF, disconnect the J 38715-A and the adapter, reconnect the harness connector

at the inflatable restraint module and cycle the ignition ON. If the DTC resets after reconnecting the module, replace the inflatable

restraint module.

5. Disconnect the harness connector at the SDM.

6. Ignition ON, test for less than 1 V 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)

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

7. Test for less than 1 V 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 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

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* Seat horizontal motor sensor terminal C

* Seat front vertical motor sensor terminal C LHD)

* Seat front vertical motor sensor terminal A RHD)

* Seat rear vertical motor sensor terminal A (LHD)

* Seat rear vertical motor sensor terminal C (RHD)

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 MSM.

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

* Seat horizontal motor sensor terminal A

* Seat front vertical motor sensor terminal A (LHD)

* Seat front vertical motor sensor terminal C (RHD)

* Seat rear vertical motor sensor terminal C (LHD)

* Seat rear vertical motor sensor terminal A (RHD)

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 MSM.

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 MSM.

4. Verify the appropriate scan tool driver seat sensor parameter is less than 1.0 V.

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

5. Install a 3 A fused jumper wire between the appropriate signal circuit terminal and 5 V reference circuit terminal listed below. Verify the

appropriate scan tool driver seat position sensor parameter is greater than 4.75 V.

* Seat horizontal position sensor terminal B and terminal A

* Seat front vertical position sensor terminal B and terminal A (LHD)

* Seat front vertical position sensor terminal B and terminal C (RHD)

* Seat rear vertical position sensor terminal B and terminal C (LHD)

* Seat rear vertical position sensor terminal B and terminal A (RHD)

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

MSM.

6. If all circuits test normal, test or replace the appropriate seat position sensor.

B1850 01 or B1850 06

1. Ignition OFF, disconnect the harness connector at the lumbar motor.

2. Test for less than 2 Ohms between the appropriate low reference circuit terminal listed below and ground:

* Terminal C (LHD)

* Terminal D (RHD)

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 MSM.

3. Ignition ON, test for 4.8 - 5.2 V between the appropriate 5 V reference circuit terminal listed below and ground:

* Terminal D (LHD)

* Terminal C (RHD)

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 MSM.

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 MSM.

4. Verify the scan tool Lumbar Sensor parameter is less than 1.0 V.

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

5. Install a 3 A fused jumper wire between the signal circuit terminal E and the appropriate 5 V reference circuit terminal listed below. Verify

the scan tool Lumbar Sensor parameter is greater than 4.75 V.

* Terminal D (LHD)

* Terminal C (RHD)

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

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Connector End View Reference

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

Description and Operation

Electronic Suspension Control Description and Operation (See: Steering and Suspension/Suspension/Suspension Control ( Automatic - Electronic

)/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)

Scan Tool Reference

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

Circuit/System Verification

Ignition ON, observe the scan tool Position Sensor Data parameters while the vehicle is jounced. The readings should vary between 0.35-4.75 volts.

Circuit/System Testing

1. Ignition OFF, disconnect the harness connector at the appropriate suspension position sensor.

2. Ignition OFF, test for less than 1 ohm between the low reference circuit terminal C and ground.

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

module.

3. Ignition ON, test for 4.8-5.2 volts between the 5-volt reference circuit terminal A and ground.

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

replace the ESC module.

瀚慖f greater than the specified range, test the 5-volt reference circuit for a short to voltage. If the circuit tests normal, replace the ESC

module.

4. Verify the scan tool position sensor parameter is less than 0.35 volt.

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

module.

5. Install a 3A fused jumper wire between the signal circuit terminal B and the 5-volt reference circuit terminal A. Verify the scan tool position

sensor parameter is greater than 4.75 volts.

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

ESC module.

6. If all circuits test normal, test or replace the applicable suspension position sensor.

Component Testing

1. Install a 3A fused jumper wire between the 5-volt reference terminal A and 5 volts. Install a jumper wire between the low reference terminal

C and ground.

2. Sweep the suspension position sensor through the entire range while monitoring the voltage between the signal terminal B and the low

reference terminal C. The range should vary between 0.35-4.75 volts without any spikes or dropouts.

瀚慖f not within the specified range or if it is erratic, replace the suspension position sensor.

Repair Instructions

* Electronic Suspension Front Position Sensor Replacement (See: Sensors and Switches/Sensors and Switches - Steering and

Suspension/Sensors and Switches - Suspension/Ride Height Sensor/Service and Repair/Electronic Suspension Front Position Sensor

Replacement)

* Electronic Suspension Rear Position Sensor Replacement (See: Sensors and Switches/Sensors and Switches - Steering and

Suspension/Sensors and Switches - Suspension/Ride Height Sensor/Service and Repair/Electronic Suspension Rear Position Sensor

Replacement)

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

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2. Perform any adjustment, programming or setup procedures that are required when a component or module is removed or replaced.

3. Clear the DTCs.

4. Use the scan tool Diagnostic Counter Reset output control function to bypass the 3 consecutive ignition cycle requirement for setting a DTC.

This will ensure that if a DTC was to be reset during the repair verification process, it will be displayed on the scan tool.

5. Turn OFF the ignition for 60 seconds.

6. Turn ON the ignition.

7. If the repair was related to a DTC, duplicate the Conditions for Running the DTC and use the Freeze Frame/Failure Records, if applicable, in

order to verify the DTC does not reset. If the DTC resets or another DTC is present, refer to the and perform the appropriate diagnostic

procedure

C0585

DTC C0575, C0580, C0585, or C0590

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 C0575 01

- Left Front Actuator Circuit - Short To Battery

DTC C0575 02

- Left Front Actuator Circuit - Short To Ground

DTC C0575 04

- Left Front Actuator Circuit - Open Circuit

DTC C0580 01

- Right Front Actuator Circuit - Short To Battery

DTC C0580 02

- Right Front Actuator Circuit - Short To Ground

DTC C0580 04

- Right Front Actuator Circuit - Open Circuit

DTC C0585 01

- Left Rear Actuator Circuit - Short To Battery

DTC C0585 02

- Left Rear Actuator Circuit - Short To Ground

DTC C0585 04

- Left Rear Actuator Circuit - Open Circuit

DTC C0590 01

- Right Rear Actuator Circuit - Short To Battery

DTC C0590 02

- Right Rear Actuator Circuit - Short To Ground

DTC C0590 04

- Right Rear Actuator Circuit - Open Circuit

Diagnostic Fault Information

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2010 Cadillac CTS Sedan AWD V6-3.6L Page 407

Handle Replacement (Without ATH) (See: Body and Frame/Doors, Hood and Trunk/Doors/Rear Door/Rear Door Handle/Rear Door

Exterior Handle/Service and Repair/Rear Side Door Outside Handle Replacement (Without ATH))

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

setup, and programming

B1535

DTC B1534 or B1535

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 B1534 02

- Left Rear Door Handle Switch Circuit

DTC B1535 02

- Right Rear Door Handle Switch Circuit

Diagnostic Fault Information

Circuit/System Description

The left and right rear door handle switch signal circuit provides inputs to the keyless entry control module when the appropriate rear exterior door

handle switch is activated. This input allows the keyless entry control module to detect a door open request. When the left or right rear door handle

is activated, the switch closes and the voltage signal from the keyless entry control module is pulled to ground, the keyless entry control module

will then send a command to the appropriate door module to unlock and unlatch the door.

Conditions for Running the DTC

The system voltage is 9-16 V.

Conditions for Setting the DTC

The keyless entry control module detects a short to ground in the left rear or right rear door handle signal circuit.

Action Taken When the DTC Sets

The affected door will not unlock when using the exterior rear door handle.

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.

Reference Information

Schematic Reference

Door Lock/Indicator Schematics (See: Body and Frame/Locks/Diagrams/Electrical Diagrams/Door Lock/Indicator Schematics)

Connector End View Reference

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

Description and Operation

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2010 Cadillac CTS Sedan AWD V6-3.6L Page 512

Repair Instructions

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

* Headlamp Assembly or Headlamp Bulb and/or Cornering, Sidemarker, Park, Turn Signal Bulb Replacement (TT6) (See: Lighting and

Horns/Headlamp/Service and Repair/Removal and Replacement/Headlamp Assembly or Headlamp Bulb and/or Cornering, Sidemarker, Park,

Turn Signal Bulb Replacement (TT6))Headlamp Assembly or Headlamp Bulb and/or Cornering, Sidemarker, Park, Turn Signal Bulb

Replacement (TT7) (See: Lighting and Horns/Headlamp/Service and Repair/Removal and Replacement/Headlamp Assembly or Headlamp

Bulb and/or Cornering, Sidemarker, Park, Turn Signal Bulb Replacement (TT7))Headlamp Assembly or Headlamp Bulb and/or Cornering,

Sidemarker, Park, Turn Signal Bulb Replacement (TT8) (See: Lighting and Horns/Headlamp/Service and Repair/Removal and

Replacement/Headlamp Assembly or Headlamp Bulb and/or Cornering, Sidemarker, Park, Turn Signal Bulb Replacement (TT8))Headlamp

Assembly or Headlamp Bulb and/or Cornering, Sidemarker, Park, Turn Signal Bulb Replacement (Without TT6/TT7/TT8/T84/T85) (See:

Lighting and Horns/Headlamp/Service and Repair/Removal and Replacement/Headlamp Assembly or Headlamp Bulb and/or Cornering,

Sidemarker, Park, Turn Signal Bulb Replacement (Without TT6/TT7/TT8/T84/T8)

* Relay Replacement (Attached to Wire Harness) (See: Power and Ground Distribution/Power Distribution Relay/Service and Repair/Relay

Replacement (Attached to Wire Harness))Relay Replacement (Within an Electrical Center) (See: Power and Ground Distribution/Power

Distribution Relay/Service and Repair/Relay Replacement (Within an Electrical Center))

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

B2610

DTC B2610

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 B2610 00

- Passenger Compartment Dimming 1 Circuit

Diagnostic Fault Information

Circuit/System Description

The instrument panel (I/P) lamp dimmer switch is used to increase and decrease the brightness of the interior backlighting components. The I/P

dimmer switch provides a voltage signal that will increase as the brightness of the lights are increased and decrease as the brightness of the lights

are decreased. The body control module (BCM) provides a low reference signal and a B+ voltage reference to the I/P dimmer switch. When the I/P

dimmer switch is placed in the desired position, the dimmed voltage setting is applied from the I/P dimmer switch through the I/P dimmer switch

signal circuit to the BCM. The BCM interprets the signal and applies the dimmed voltage to the I/P lamps supply voltage circuit and the interior

backlighting components dim to the requested level.

Conditions for Running the DTC

* Battery voltage must be between 9-16 V.

* Park lamps ON.

Conditions for Setting the DTC

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P2729 - U2100

U Code List

Diagnostic Trouble Code (DTC) List - Vehicle

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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

* 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

Perform the Liftgate Calibration (See: Body and Frame/Doors, Hood and Trunk/Trunk / Liftgate/Testing and Inspection/Programming and

Relearning). The liftgate module should learn the travel limits, exit the calibration mode, and B1019 00 will become a history code.

Repair Instructions

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

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

B1020

DTC B1020

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 B1020 00

- Auxiliary Electronic Control Unit (ECU) 1 Performance

Circuit/System Description

The navigation radio communicates with the radio control assembly via serial data. If the radio receives an improper status response message, DTC

B1020 will set.

This DTC indicates an internal ECU fault or a stuck button on the faceplate. No external circuits are involved.

Conditions for Running the DTC

* Ignition is ON or in the 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

The radio receives an improper status response indicating an internal ECU fault or a stuck button on the radio control assembly.

Action Taken when the DTC Sets

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* 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

P014A

DTC P013A, P013C, P013E, or P014A (LLT)

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.

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Repair Instructions

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

* Rear Side Door Window Switch Replacement (See: Windows and Glass/Windows/Service and Repair/Rear Side Door Window Switch

Replacement)

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

B3823

DTC B3819, B3820, B3822, or B3823

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 B3819 00

- Left Rear Window Up Control Circuit

DTC B3820 00

- Left Rear Window Down Control Circuit

DTC B3822 00

- Right Rear Window Up Control Circuit

DTC B3823 00

- Right Rear Window Down Control Circuit

Diagnostic Fault Information

Circuit/System Description

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DTC P0037

- HO2S Heater Control Circuit Low Voltage Bank 1 Sensor 2

DTC P0038

- HO2S Heater Control Circuit High Voltage Bank 1 Sensor 2

DTC P0050

- HO2S Heater Control Circuit Bank 2 Sensor 1

DTC P0051

- HO2S Heater Control Circuit Low Voltage Bank 2 Sensor 1

DTC P0052

- HO2S Heater Control Circuit High Voltage Bank 2 Sensor 1

DTC P0056

- HO2S Heater Control Circuit Bank 2 Sensor 2

DTC P0057

- HO2S Heater Control Circuit Low Voltage Bank 2 Sensor 2

DTC P0058

- HO2S Heater Control Circuit High Voltage Bank 2 Sensor 2

Diagnostic Fault Information

Circuit Description

The heated oxygen sensor (HO2S) heater reduces the time required for the oxygen sensor to reach operating temperature and maintains the

operating temperature during extended idle periods. When the ignition is turned to the ON position, ignition voltage is supplied directly to the

sensor heater. The engine control module (ECM) controls the heater operation by first modulating the control circuit to ground when the sensors are

cold. This prevents the possibility of thermal shock to the sensor, from condensation build-up on the sensor, by controlling the sensors rate of

heating. After a predetermined amount of time, the ECM commands the heaters ON continuously. Once the sensor reaches operating temperature,

the ECM may modulate the heater control circuit to ground, to maintain a desired temperature.

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.

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B3601 01

The RCDLR detects a voltage level on the control circuit greater than 8 volts when the key capture solenoid is commanded OFF.

B3601 02

The RCDLR detects a voltage level on the control circuit less than 2 volts when the key capture solenoid is commanded ON.

Action Taken When the DTC Sets

* The key capture solenoid output is disabled.

* SERVICE KEYLESS START SYSTEM is displayed on the DIC.

Conditions for Clearing the DTC

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

* A history DTC will clear after 40 malfunction-free ignition cycles.

Reference Information

Schematic Reference

Column Lock Schematics (See: Diagrams/Electrical Diagrams/Steering/Steering Column/Column Lock Schematics)

Connector End View Reference

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

Description and Operation

Immobilizer Description and Operation (without Y41) (See: Accessories and Optional Equipment/Antitheft and Alarm Systems/Description and

Operation/Immobilizer Description and Operation (Without Y41))Immobilizer Description and Operation (with Y41) (See: Accessories and

Optional Equipment/Antitheft and Alarm Systems/Description and Operation/Immobilizer Description and Operation (With Y41))

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

1. With a valid keyless entry transmitter in the vehicle, observe the scan tool Key Capture Solenoid Command parameter while pressing and

releasing the ignition mode switch. The parameter should cycle between Active and Inactive.

2. Command the Key Capture Solenoid ON and OFF with the scan tool while attempting to cycle the igniting from OFF to ON. The ignition

knob should rotate when the solenoid is commanded ON and should not rotate when the solenoid is commanded OFF.

Circuit/System Testing

1. Ignition OFF, disconnect the harness connector at the key capture solenoid.

2. Test for less than 5 ohms between the ground circuit terminal 1 and ground.

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

3. Connect a test lamp between the control circuit terminal 2 and the ground circuit terminal 1.

4. Command the Key Capture Solenoid ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the

commanded states.

瀚慖f the test lamp is always ON, test the control circuit for short to voltage. If the circuit tests normal, replace the RCDLR.

瀚慖f the test lamp is always OFF, test the control circuit for short to ground or an open/high resistance. If the circuit tests normal, replace the

RCDLR.

5. If all circuits tests normal, test or replace the key capture solenoid.

Repair Instructions

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

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DTC Descriptors

B009D 01

- Pedestrian Impact Detection Safing Sensor Short to Battery

B009D 02

- Pedestrian Impact Detection Safing Sensor Short to Ground

B009D 08

- Pedestrian Impact Detection Safing Sensor Signal Invalid/Open Circuit

B009D 39

- Pedestrian Impact Detection Safing Sensor Internal Electronic Failure

B009D 3A

- Pedestrian Impact Detection Safing Sensor Incorrect Component Installed

Diagnostic Fault Information

Circuit/System Description

The pedestrian impact detection system senses and discriminates vehicle impacts and deploys the pedestrian hood hinge actuators in a timely

manner to protect vulnerable pedestrians. The safing sensor provides vehicle acceleration information to the pedestrian impact detection module.

The pedestrian impact detection module uses vehicle acceleration information from the safing sensor and force information from the discrimination

sensor to determine those events when the deployment of the hood hinge actuator is expected. The pedestrian impact detection module provides a

two wire current loop interface to the safing sensor. The pedestrian impact detection module also provides power and ground to the safing sensor

over the same two wire discrete interface. The pedestrian impact detection module monitors the safing sensor for any system malfunction and when

a malfunction is detected, a DTC will be stored in non volatile memory.

Conditions for Running the DTC

Ignition voltage is between 9-16 volts.

Conditions for Setting the DTC

B009D 01

The safing sensor voltage is greater than 3.2 V and the safing sensor voltage is not supplied by the pedestrian impact detection module.

B009D 02

The safing sensor voltage is less than 3.5 V and the safing sensor voltage is being supplied by the pedestrian impact detection module.

B009D 08

The safing sensor high and/or low circuit is open. An open circuit indicates no new data received.

B009D 39

The safing sensor sends an error message or invalid data to the pedestrian impact detection module.

B009D 3A

Invalid safing sensor ID data received by the pedestrian impact detection module

Action Taken When the DTC Sets

* The pedestrian impact detection module commands the DIC to display Service Pedestrian Protection System.

* The pedestrian impact detection module stores DTC in memory.

Conditions for Clearing the DTC

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* DTC P0201, P0202, P0203, P0204, P0205, P0206 P0261, P0262, P0264, P0265, P0267, P0268, P0270, P0271, P0273, P0274, P0276,

P0277, P2146, P2149, P2152, P2155, P216A, or P216D is not set.

* The ignition voltage is greater than 10 volts.

* The engine speed is greater than 240 RPM.

* The air flow into the engine is greater than 220 grams.

* The HO2S 1 heater duty cycle is greater than 90 percent for greater than 5 seconds.

* The evaporative emissions system (EVAP) is not performing an intrusive test.

* The ECM is not commanding the air/fuel mixture lean.

* DTC P0131 and P0151 run continuously once the conditions above exist for greater than 5 seconds.

Condition 2

* DTC P0116, P0117, P0118, P0119, P0201, P0202, P0203, P0204, P0205, P0206 P0261, P0262, P0264, P0265, P0267, P0268, P0270,

P0271, P0273, P0274, P0276, P0277, P2146, P2149, P2152, P2155, P216A, or P216D is not set.

* The ignition voltage is greater than 10 volts.

* The engine speed is greater than 240 RPM.

* The conditions for a cold start are present.

* The HO2S 1 heater duty cycle is greater than 90 percent.

* DTC P0131 and P0151 run continuously once the conditions above exist for greater than 5 seconds.

Conditions for Setting the DTC

Condition 1

The ECM detects that an HO2S 1 signal voltage is less than 60 mV while the corresponding HO2S 2 voltage is greater than 500 mV.

Condition 2

The ECM detects that an HO2S 1 signal voltage is less than 60 mV after a cold start.

Action Taken when the DTC Sets

DTCs P0131 and P0151 are Type B DTCs.

Conditions for Clearing the MIL/DTC

DTCs P0131 and P0151 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

1. Engine idling, observe the appropriate scan tool HO2S 1 voltage parameter. The voltage should fluctuate above and below the range of

350-550 mV.

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.

Circuit/System Testing

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DTC B1735, B1740, B1745, B1750, B1755, B1760, B1815, or B1820

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 B1735 01

- Seat Front Up Switch Circuit Short to Battery

DTC B1740 01

- Seat Front Down Switch Circuit Short to Battery

DTC B1745 01

- Seat Rear Up Switch Circuit Short to Battery

DTC B1750 01

- Seat Rear Down Switch Circuit Short to Battery

DTC B1755 01

- Seat Assembly Forward Switch Circuit Short to Battery

DTC B1760 01

- Seat Assembly Rearward Switch Circuit Short to Battery

DTC B1815 01

- Seat Recline Forward Switch Circuit Short to Battery

DTC B1820 01

- Seat Recline Rearward Switch Circuit Short to Battery

Diagnostic Fault Information

Circuit/System Description

When the power seat switches are pressed, they send a 12 V signal through the switch signal circuits to the memory seat module (MSM). The MSM

then commands the driver seat and lumbar motors to move in response to the switch signals.

Conditions for Running the DTC

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

B3820 00

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

B3822 00

The BCM detects a fault in the right rear window up circuit.

B3823 00

The BCM detects a fault in the right rear window down circuit.

Action Taken When the DTC Sets

The left or right rear power window will be inoperative from the driver master control.

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.

Reference Information

Schematic Reference

Moveable Window Schematics (See: Windows and Glass/Windows/Diagrams/Electrical Diagrams)

Connector End View Reference

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

Description and Operation

Power Windows Description and Operation (See: Windows and Glass/Windows/Description and Operation/Power Windows 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)

Scan Tool Reference

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

Circuit/System Verification

Ignition ON, command the appropriate rear door window UP and DOWN by using the window switch on the driver master control. The rear door

window should perform UP and DOWN function.

Circuit/System Testing

1. Ignition OFF, disconnect the harness connector at the appropriate rear window switch.

2. Ignition ON, test for greater than 9 volts between the signal circuit terminal A and ground while commanding the rear window UP by using

the window switch on the driver master control.

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

BCM.

3. Test for greater than 9 volts between the signal circuit terminal C and ground while commanding the rear window DOWN by using the

window switch on the driver master control.

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

BCM.

4. If all circuits test normal, replace the rear window switch.

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* Left front sensor circuit terminal 29

* Right front sensor circuit terminal 6

* Left rear sensor circuit terminal 5

* Right rear sensor circuit terminal 2

瀚慖f less than the specified value, test the ignition voltage circuit for a short to ground.

5. Test for infinite resistance between the following signal circuit terminal of the appropriate sensor circuit listed below and ground.

* Left front sensor circuit terminal 28

* Right front sensor circuit terminal 17

* Left rear sensor circuit terminal 4

* Right rear sensor circuit terminal 3

瀚慖f less than the specified value, test the signal circuit for a short to ground.

6. Ignition OFF, disconnect the harness connector at the appropriate wheel speed sensor.

7. Test for less than 2 ohm between the appropriate ignition voltage circuit terminals listed below.

* Left front sensor circuit terminal 29 at the EBCM harness connector and terminal 1 at the wheel speed sensor harness connector.

* Right front sensor circuit terminal 6 at the EBCM harness connector and terminal 1 at the wheel speed sensor harness connector.

* Left rear sensor circuit terminal 5 at the EBCM harness connector and terminal 1 at the wheel speed sensor harness connector.

* Right rear sensor circuit terminal 2 at the EBCM harness connector and terminal 1 at the wheel speed sensor harness connector.

瀚慖f greater than the specified range, test the ignition voltage circuit for an open or high resistance.

8. Test for less than 2 ohm between the appropriate signal circuit terminals listed below.

* Left front sensor circuit terminal 28 at the EBCM harness connector and terminal 2 at the wheel speed sensor harness connector.

* Right front sensor circuit terminal 17 at the EBCM harness connector and terminal 2 at the wheel speed sensor harness connector.

* Left rear sensor circuit terminal 4 at the EBCM harness connector and terminal 2 at the wheel speed sensor harness connector.

* Right rear sensor circuit terminal 3 at the EBCM harness connector and terminal 2 at the wheel speed sensor harness connector.

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

9. If all circuits test normal, replace the appropriate wheel speed sensor. If the DTC resets, replace the EBCM.

Repair Instructions

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

* Front Wheel Speed Sensor Replacement (RWD) (See: Brakes and Traction Control/Antilock Brakes / Traction Control Systems/Wheel

Speed Sensor/Service and Repair/Front Wheel Speed Sensor Replacement)Front Wheel Speed Sensor Replacement (AWD) (See: Brakes

and Traction Control/Antilock Brakes / Traction Control Systems/Wheel Speed Sensor/Service and Repair/Front Wheel Speed Sensor

Replacement)

* Rear Wheel Speed Sensor Replacement (See: Brakes and Traction Control/Antilock Brakes / Traction Control Systems/Wheel Speed

Sensor/Service and Repair/Rear Wheel Speed Sensor Replacement)

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

Park Brake

DTC C056D

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) provide an overview of each diagnostic category.

DTC Descriptors

DTC C056D 34

- ECU Hardware Performance RAM Failure

DTC C056D 35

- ECU Hardware Performance ROM Failure

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2010 Cadillac CTS Sedan AWD V6-3.6L Page 716

Repair Instructions

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

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

C0401

DTC C0401

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 C0401 01

- Transfer Case Oil Temperature Sensor Circuit Short to Battery

DTC P0401 06

- Transfer Case Oil Temperature Sensor Circuit Short to Ground or Open

Diagnostic Fault Information

Circuit/System Description

The temperature sensor is a variable resistor, as the temperature increases the resistance decreases and as the temperature decreases the resistance

increases.

Conditions for Running the DTC

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(DDM) and front passenger door module (PDM) to apply battery voltage to the door courtesy lamps. In the event that any of these lamps were to

remain illuminated for more than 20 minutes with the ignition switch in the OFF position, the BCM will deactivate the inadvertent power courtesy

lamp control circuit to prevent a total battery discharge condition.

Conditions for Running the DTC

Battery voltage must be between 9-16 V.

Conditions for Setting the DTC

B2555 01

The DDM or PDM detects a short to voltage in the courtesy lamp high control circuit.

B2555 02

The DDM or PDM detects a short to ground in the courtesy lamp high control circuit.

Actions Taken When the DTC Sets

The affected door courtesy lamp will not illuminate or remain illuminated depending on the fault that is present.

Conditions for Clearing the DTC

* The condition responsible for setting the DTC no longer exists.

* A history DTC will clear once 100 consecutive malfunction-free ignition cycles have occurred.

Diagnostic Aids

After clearing the DTC, the ignition has to be cycled ON and OFF before the inoperative courtesy lamp will operate.

Reference Information

Schematic Reference

Interior Lights Schematics (See: Diagrams/Electrical Diagrams/Lighting and Horns/System Diagram/Interior Lights Schematics)

Connector End View Reference

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

Description and Operation

Interior Lighting Systems Description and Operation (See: Lighting and Horns/Description and Operation/Interior Lighting Systems 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)

Scan Tool Reference

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

Circuit/System Testing

1. Ignition OFF, disconnect the harness connector at the appropriate front door courtesy lamp.

2. Ignition ON, test for less than 25.0 ohm between the ground circuit terminal B and ground.

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

3. Connect a test lamp between the control circuit terminal A and the ground circuit terminal B.

4. Command the Courtesy Lamps ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the

commanded states.

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

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

replace the BCM.

5. If all circuits test normal, replace the front door courtesy lamp.

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2010 Cadillac CTS Sedan AWD V6-3.6L Page 233

* Air temperature actuator-left terminal 3 and terminal 1

* Air temperature actuator-right terminal 3 and terminal 2

* Mode actuator terminal 3 and terminal 2

* Recirculation actuator terminal 5 and terminal 1

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

replace the HVAC control module.

8. Ignition OFF, test for less than 10 ohms between the following control circuit terminal and ground.

* Air temperature actuator-left terminal 5

* Air temperature actuator-right terminal 5

* Mode actuator terminal 5

* Recirculation actuator terminal 6

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

the HVAC control module.

9. Ignition OFF, test for less than 10 ohms between the following control circuit terminal and ground.

* Air temperature actuator-left terminal 4

* Air temperature actuator-right terminal 4

* Mode actuator terminal 4

* Recirculation actuator terminal 7

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

the HVAC control module.

10. Connect a test lamp between following control circuit terminals.

* Air temperature actuator-left terminal 5 and terminal 4

* Air temperature actuator-right terminal 5 and terminal 4

* Mode actuator terminal 5 and terminal 4

* Recirculation actuator terminal 6 and terminal 7

11. Ignition ON, command the appropriate actuator door in both directions with a scan tool. The test lamp should turn ON and OFF when

commanded in both directions.

瀚慖f the test lamp remains OFF during either of the commands, test for a short to ground on either control circuit. If the circuits test normal,

replace the HVAC control module.

12. If both circuits test normal, test or replace the actuator.

Repair Instructions

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

* Air Inlet Valve Actuator Replacement (Left Hand Drive) (See: Heating and Air Conditioning/Air Door/Air Door Actuator / Motor/Service

and Repair/Air Inlet Valve Actuator Replacement)Air Inlet Valve Actuator Replacement (Right Hand Drive) (See: Application and ID)

* Mode Valve Actuator Replacement (See: Heating and Air Conditioning/Air Door/Air Door Actuator / Motor/Service and Repair/Mode

Valve Actuator Replacement)

* Temperature Valve Actuator Replacement - Left Side (See: Heating and Air Conditioning/Air Door/Air Door Actuator / Motor/Service and

Repair/Temperature Valve Actuator Replacement - Left Side)

* Temperature Valve Actuator Replacement - Right Side (See: Heating and Air Conditioning/Air Door/Air Door Actuator / Motor/Service

and Repair/Temperature Valve Actuator Replacement - Right Side)

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

and programming

B0423

DTC B0248, B0268, B0408, B0413, B0418, B0423, B3761, or B3773

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

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The security indicator will illuminate.

Conditions for Clearing the DTC

* A current DTC B3031 will be cleared upon the successful exit of learn mode.

* A history DTC will be cleared after 100 malfunction-free ignition cycles or when a scan tool is used to clear DTCs.

Reference Information

Schematic Reference

Immobilizer Schematics (See: Accessories and Optional Equipment/Antitheft and Alarm Systems/Diagrams/Electrical Diagrams/Immobilizer

Schematics)

Connector End View Reference

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

Description and Operation

Immobilizer Description and Operation (without Y41) (See: Accessories and Optional Equipment/Antitheft and Alarm Systems/Description and

Operation/Immobilizer Description and Operation (Without Y41))Immobilizer Description and Operation (with Y41) (See: Accessories and

Optional Equipment/Antitheft and Alarm Systems/Description and Operation/Immobilizer Description and Operation (With Y41))

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

Important: When performing the 10-Minute Vehicle Key Relearn Procedure, all keys not learned at that time will be erased and not be

recognized. Perform the Adding Keys procedure on all keys or instruct the customer how to perform the Adding Keys procedure should

all keys not be present at the time of repair.

1. Verify DTC B3055 is not set.

瀚慖f the DTC is set, refer to DTC B3055 (See: B Code Charts/B3055).

2. Verify the scan tool TDM Learn Coded Key parameter displays Yes.

瀚慖f not the specified value, perform the 10 Minute Vehicle Key Relearn procedure. Refer to Replacing Keys (North America except

Canada) (See: Accessories and Optional Equipment/Antitheft and Alarm Systems/Service and Repair/Replacing Keys (North America

except Canada))Replacing Keys (Canada, Europe, and Asia) (See: Application and ID).

3. Perform the 10 Minute Vehicle Key Relearn procedure. Refer to Replacing Keys (North America except Canada) (See: Accessories and

Optional Equipment/Antitheft and Alarm Systems/Service and Repair/Replacing Keys (North America except Canada))Replacing Keys

(Canada, Europe, and Asia) (See: Application and ID). The TDM should exit the learn coded key state and DTC B3031 should clear.

瀚慖f the TDM does not exit the learn coded key state after the programming attempt, replace the TDM.

Repair Instructions

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

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

B3055

DTC B3055

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.

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2010 Cadillac CTS Sedan AWD V6-3.6L Page 655

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

Connector End View Reference

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

Description and Operation

Electronic Parking Brake Control Module Description (See: Brakes and Traction Control/Parking Brake System/Parking Brake Control

Module/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)

Scan Tool Reference

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

Circuit/System Verification

Verify DTC C028B is not set.

If DTC is set, perform the Parking Brake Calibration procedure in Module Setup and perform the Parking Brake Actuator DTC Reset procedure. If

the DTC resets replace the K83 Electric Parking Brake Control Module.

Repair Instructions

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

Control Module References (See: Testing and Inspection/Programming and Relearning) for Electric Parking Brake Module replacement, setup,

and programming.

C028D

DTC C028D

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) provide an overview of each diagnostic category.

DTC Descriptors

DTC C028D 00

- Replace Park Brake Pad Malfunction

Circuit/System Description

The electric parking brake module has an internal motor, apply actuator, release actuator, and temperature sensor. The electric parking brake

module also contains the logic for applying and releasing the park brake when commanded by the electric parking brake switch. When the electric

parking brake module receives a signal from the switch, the internal circuit board temperature is checked to verify it is within operating range

before the module performs the requested operation.

Conditions for Running the DTC

Ignition OFF, ACCESSORY, or RUN mode.

Conditions for Setting the DTC

The electric parking brake module has an internal counter which keeps track of dynamic applies. When the counter reaches the threshold value this

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* The engine is operating in Closed Loop.

* The Ignition 1 voltage is between 10-32 V.

* The fuel level is greater than 10 %.

* The throttle position (TP) is between 3-70 %.

* The DTCs run continuously when the above conditions are met for 2 s.

P0132, P0138, P0152, or P0158

* DTCs P0068, P0101, P0102, P0103, P0106, P0107, P0108, P0112, P0113, P0116, P0117, P0118, P0120, P0121, P0122, P0123, P0128,

P0201, P0202, P0203, P0204, P0205, P0206, P0207, P0208, P0220, P0222, P0223, P0442, P0443, P0446, P0449, P0455, P0496, P1516,

P2101, P2119, P2135, P2176 are not set.

* The engine is operating in Closed Loop.

* The Ignition 1 voltage is between 10-32 V.

* 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)

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2010 Cadillac CTS Sedan AWD V6-3.6L Page 231

Circuit/System Description

The HVAC control module controls the HVAC door actuators to regulate the airflow through the HVAC system. Each actuator consists of an

electric motor and a potentiometer. The module supplies a low reference and 5-volt reference source voltage to the potentiometer. The HVAC

control module monitors the voltage drop across the potentiometer on the door position signal circuit. When the actuator shaft rotates, the voltage

on the door position signal circuit changes. The HVAC module controls the direction of the actuator door by changing the polarity of the control

circuits.

* Air Flow Control 3 is the mode actuator

* Air Flow Control 7 is the recirculation actuator

* Temperature Control 1 is the left temperature actuator

* Temperature Control 2 is the right temperature actuator

Conditions for Running the DTC

* Ignition ON.

* Ignition voltage is between 9-16 volts.

* The HVAC module is ON.

Conditions for Setting the DTC

The actual door position differs from the commanded door position by more than 4 counts or the HVAC control module detects the door position

signal circuit is less than 7 counts or greater than 250 counts.

Action Taken When the DTC Sets

Control A and control B circuits are deactivated for the appropriate actuator.

Conditions for Clearing the DTC

* The DTC becomes history when the HVAC control module no longer detects the condition that set the DTC.

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