2010 Cadillac Truck SRX FWD V6-3.0L Page 2176

2010 Cadillac Truck SRX FWD V6-3.0L Page 2176

DTC Descriptor

DTC U2099 00

- High Speed Communication Enable Circuit

Diagnostic Fault Information

Circuit/System Description

The body control module (BCM) activates the serial data communication enable circuit, when the ignition key is in ACC, ON or START. The serial

data communication enable circuit wakes up the modules for serial data buss communication.

Conditions for Running the DTC

* The system voltage is between 9-16 volts.

* The vehicle power mode master requires serial data communication to occur.

Conditions for Setting the DTC

The BCM senses a short to ground on the serial data communication enable circuit.

Action Taken When the DTC Sets

* The output command is turned off while the malfunction is present.

* The modules use a default value for the missing parameters until the next ignition cycle.

* The module(s) is never signaled, therefore the specific subsystem(s) will not function.

* The vehicle will not start while the circuit is shorted to ground.

Conditions for Clearing the DTC

* A current DTC clears when the malfunction is no longer present.

* A history DTC clears when the module ignition cycle counter reaches the reset threshold of 50, without a repeat of the malfunction.

Diagnostic Aids

* Use the DMM MIN/MAX function to capture/locate intermittent conditions.

* Short to ground will also set multiple history no communication codes for GMLAN high speed modules.

Reference Information

Schematic Reference

Data Communication Schematics (See: Powertrain Management/Computers and Control Systems/Information Bus/Diagrams/Electrical Diagrams)

Connector End View Reference

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

Description and Operation

Data Link Communications Description and Operation (See: Powertrain Management/Computers and Control Systems/Information

Bus/Description and Operation)

Electrical Information Reference

* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit

Testing/Circuit Testing)

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

Procedures/Connector Repairs/Connector Repairs)

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

Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)

* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring

Repairs/Wiring Repairs)

Circuit/System Testing

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DTC Descriptor

DTC C0280 54

- Stability System Active Too Long High Temperature

Circuit/System Description

The solenoid valves are integral parts of the brake pressure modulator valve assembly. The brake pressure modulator valve assembly contains an

isolation solenoid valve and a dump solenoid valve for each wheel and a traction control/stability control supply solenoid valve and isolation

solenoid valve for each brake circuit. The solenoid valves are not engaged during normal system operation. When the ABS, traction control or

stability control operation is required the electronic brake control module (EBCM) turns the required solenoid valves ON.

Conditions for Running the DTC

Ignition ON

Conditions for Setting the DTC

Stability control is active for more than 15 s.

Action Taken When the DTC Sets

* The EBCM disables the stability control for the duration of the ignition cycle.

* The traction control/stability control-active indicator turns ON.

Conditions for Clearing the DTC

The condition for setting the DTC is no longer present.

Diagnostic Aids

DTC can set because of extended operation of ABS, traction control or stability control.

Reference Information

Schematic Reference

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

Connector End View Reference

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

Description and Operation

ABS Description and Operation (See: Brakes and Traction Control/Antilock Brakes / Traction Control Systems/Description and Operation)

Electrical Information Reference

* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit

Testing/Circuit Testing)

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

Procedures/Connector Repairs/Connector Repairs)

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

Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)

* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/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 ON, verify that DTC C0186, C0196, C019B, or C0710 is not set as a present DTC.

瀚慖f any listed DTC is present, refer to Diagnostic Trouble Code (DTC) List - Vehicle (See: Diagnostic Trouble Code

Descriptions/Diagnostic Trouble Code (DTC) List - Vehicle) to diagnose that DTC prior to this diagnostic.

2. Ignition OFF, inspect the B99 Steering Wheel Angle Sensor and B119 Multi-axis Acceleration Sensor for correct installation.

瀚慖f loose or incorrect installation is diagnosed, correct the installation of the component.

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DTC Descriptor

DTC B3600 03

- Passenger Compartment Dimming Request Signal Circuit Voltage Below Threshold

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.

Conditions for Setting the DTC

The BCM detects a short to ground or an open/high resistance in the I/P dimmer switch signal circuit.

Actions Taken When the DTC Sets

* The I/P dimmer switch will not operate.

* The I/P dimming lamps will not illuminate.

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.

Reference Information

Schematic Reference

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

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. With a scan tool clear the DTC.

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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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DTC Descriptor

DTC C0280 54

- Stability System Active Too Long High Temperature

Circuit/System Description

The solenoid valves are integral parts of the brake pressure modulator valve assembly. The brake pressure modulator valve assembly contains an

isolation solenoid valve and a dump solenoid valve for each wheel and a traction control/stability control supply solenoid valve and isolation

solenoid valve for each brake circuit. The solenoid valves are not engaged during normal system operation. When the ABS, traction control or

stability control operation is required the electronic brake control module (EBCM) turns the required solenoid valves ON.

Conditions for Running the DTC

Ignition ON

Conditions for Setting the DTC

Stability control is active for more than 15 s.

Action Taken When the DTC Sets

* The EBCM disables the stability control for the duration of the ignition cycle.

* The traction control/stability control-active indicator turns ON.

Conditions for Clearing the DTC

The condition for setting the DTC is no longer present.

Diagnostic Aids

DTC can set because of extended operation of ABS, traction control or stability control.

Reference Information

Schematic Reference

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

Connector End View Reference

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

Description and Operation

ABS Description and Operation (See: Brakes and Traction Control/Antilock Brakes / Traction Control Systems/Description and Operation)

Electrical Information Reference

* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit

Testing/Circuit Testing)

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

Procedures/Connector Repairs/Connector Repairs)

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

Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)

* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/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 ON, verify that DTC C0186, C0196, C019B, or C0710 is not set as a present DTC.

瀚慖f any listed DTC is present, refer to Diagnostic Trouble Code (DTC) List - Vehicle (See: Diagnostic Trouble Code

Descriptions/Diagnostic Trouble Code (DTC) List - Vehicle) to diagnose that DTC prior to this diagnostic.

2. Ignition OFF, inspect the B99 Steering Wheel Angle Sensor and B119 Multi-axis Acceleration Sensor for correct installation.

瀚慖f loose or incorrect installation is diagnosed, correct the installation of the component.

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DTC Descriptor

DTC B1016 00

- Vehicle Identification Number (VIN) Information Not Programmed

Circuit/System Description

After a loss of battery power has been restored, the theft deterrent module (TDM) will perform a check on the stored vehicle identification number

(VIN). If the VIN is CORRECT, the TDM will run the VIN Timer for a programmable length of time, typically 10 minutes. The TDM will send a

message via the serial data circuit to the instrument panel cluster (IPC) to illuminate the SECURITY indicator. After the VIN Timer has timed out,

the security indicator will turn OFF. If the VIN is INCORRECT, the TDM will send the fuel disable password to the engine control module (ECM),

via the serial data circuit. The immobilizer system considers this to be a tamper and will not allow the vehicle to start. The TDM will send a

message via the serial data circuit to the IPC to flash the SECURITY indicator.

Conditions for Running the DTC

Ignition ON

Conditions for Setting the DTC

* The VIN check flag of the TDM is true.

* The TDM has determined that the battery has been reconnected after a battery disconnect.

Action Taken When the DTC Sets

* The vehicle will not start.

* The TDM sends the fuel disable message via the serial data circuit to the ECM.

* The TDM sends a message to the IPC to illuminate the SECURITY indicator.

Conditions for Clearing the DTC

The TDM clears the current DTC when the correct VIN information is present.

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

With a scan tool, verify DTC B1016 is not set.

If DTC is set, program the TDM. If DTC resets, 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

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DTC Descriptor

DTC C0186 5A

- Lateral Acceleration Sensor Circuit Not Plausible

DTC C0186 71

- Lateral Acceleration Sensor Circuit Invalid Data

DTC C0196 00

- Yaw Rate Circuit Malfunction

DTC C0196 5A

- Yaw Rate Signal Not Plausible

DTC C019B 5A

- Yaw Rate Signal Not Plausible

DTC C0287 4B

- Longitudinal Acceleration Sensor Circuit Calibration Not Learned

DTC C0287 5A

- Longitudinal Acceleration Sensor Circuit Not Plausible

DTC C0287 71

- Longitudinal Acceleration Sensor Circuit Invalid Data

Diagnostic Fault Information

Circuit/System Description

The yaw rate, lateral acceleration and longitudinal acceleration sensors are combined into one multi-axis acceleration sensor, external to the

electronic brake control module (EBCM). The EBCM supplies a 12 V reference voltage to the multi-axis acceleration sensor. The multi-axis

acceleration sensor communicates with the EBCM via the high speed controller area network (CAN) serial data circuit. The EBCM activates the

stability control function depending on multi-axis acceleration sensor input.

Conditions for Running the DTC

Ignition ON

Conditions for Setting the DTC

C0186 5A

* The lateral acceleration sensor signal offset is out of specified range.

* The lateral acceleration sensor signal is not plausible with the yaw rate sensor signal, steering angle sensor signal and vehicle speed.

C0186 71

The EBCM received an invalid lateral acceleration sensor signal.

C0196 00

The yaw rate sensor signal is not plausible.

C0196 5A

* The yaw rate sensor offset is out of specified range.

* The yaw rate sensor signal is not plausible with the lateral acceleration sensor signal, steering angle sensor signal and vehicle speed.

C019B 5A

The yaw rate sensor signal is out of specified range.

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DTC Descriptor

DTC B1001 00

- Option Configuration Error

DTC B1001 45

- Option Configuration Error Variant Not Programmed

DTC B1001 46

- Option Configuration Error

DTC B1001 4B

- Option Configuration Error Calibration Not Learned

Circuit/System Description

Some control modules must be configured with serial numbers, vehicle options, or other information. If a control module was not properly

configured after installation, that module may set DTC B1001.

Conditions for Running the DTC

Battery voltage is between 9-16 volts and data link communications operate normally.

Conditions for Setting the DTC

The control module is not configured properly.

Conditions for Clearing the DTC

* A current DTC clears when the malfunction is no longer present.

* A history DTC clears when the module ignition cycle counter reaches the reset threshold, without a repeat of the malfunction.

Circuit/System Verification

1. Program or configure the module or related module that set DTC B1001. The module should successfully configure.

瀚慖f the module will not configure, replace the module that set the DTC.

2. With a scan tool, clear the DTC.

3. Ignition OFF, remove the scan tool, open and close the drivers door.

4. Wait 60 seconds, then recheck for DTCs. DTC B1001 should not set.

瀚慖f DTC B1001 sets, replace the 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 control module replacement, setup, and programming

Supplemental Inflatable Restraints (PPS)

DTC B1001 (PPS)

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 B1001 00

- Option Configuration Error

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DTC Descriptor

DTC U2142 00

- Lost Communication With Yaw Rate Sensor (YRS)

Circuit/System Description

Modules connected to the CAN bus serial data circuits monitor for serial data communications during normal vehicle operation. Operating

information and commands are exchanged among the modules. The modules have prerecorded information about what messages are needed to be

exchanged on the serial data circuits. The messages are supervised and also, some periodic messages are used by the receiver module as an

availability indication of the transmitter module. Each message contains the identification number of the transmitter module.

The electronic brake control module (EBCM) activates the other modules connected to the CAN serial data circuits by applying voltage when the

ignition key is in ACC, ON or START. The EBCM, Yaw Rate and Lateral Acceleration Sensor are the only modules connected to the CAN bus

serial data circuits. For more information on CAN bus serial data refer to Data Link Communications Description and Operation (See: Powertrain

Management/Computers and Control Systems/Information Bus/Description and Operation).

Conditions for Running the DTC

* The system voltage is between 9-16 volts.

* The vehicle power mode master requires serial data communication to occur.

Conditions for Setting the DTC

A supervised periodic message that includes the transmitter module availability has not been received.

Action Taken When the DTC Sets

* The vehicle stability enhancement system (VSES), if equipped, and traction control system (TCS) will not function.

* System OFF lamps will illuminate for these systems.

Conditions for Clearing the DTC

* A current DTC clears when the malfunction is no longer present.

* A history DTC clears when the module ignition cycle counter reaches the reset threshold of 50, without a repeat of the malfunction.

Diagnostic Aids

* Sometimes, while diagnosing a specific customer concern or after a repair, you may notice a history U-code present. However, there is no

associated "current" or "active" status. Loss-of- communication U-codes such as these can set for a variety of reasons. Many times, they are

transparent to the vehicle operator and technician, and/or have no associated symptoms. Eventually, they will erase themselves automatically

after a number of fault-free ignition cycles. This condition would most likely be attributed to one of these scenarios:

- A control module on the data communication circuit was disconnected while the communication circuit is awake.

- Power to one or more modules was interrupted during diagnosis.

- A low battery condition was present, so some control modules stop communicating when battery voltage drops below a certain threshold.

- Battery power was restored to the vehicle and control modules on the communication circuit did not all re-initialize at the same time.

- If a loss-of-communication U-code appears in history for no apparent reason, it is most likely associated with one of the scenarios above.

These are all temporary conditions and should never be interpreted as an intermittent fault, causing you to replace a part.

* A control module may have a U-code stored in history that does not require any repairs. Issues with late or corrupted messages between

control modules can be temporary with no apparent symptom or complaint; this does not mean the control module is faulty. Do not replace a

control module based only on a history U-code.

* Do not replace a control module reporting a U-code. The U-code identifies which control module needs to be diagnosed for a communication

issue.

* Communication may be available between the BCM and the scan tool with either the low or high speed GMLAN serial data system

inoperative. This condition is due to the BCM using both the low and high speed GMLAN systems.

* Use to determine if the module uses high or low speed GMLAN serial data communications.

* Some control modules may not have internal protection for specific control circuits and may open a B+ or ignition fuse. If a fuse is open and

the B+ or ignition circuit is not shorted to ground, ensure none of the control circuits are shorted to ground before replacing the control

module.

* This diagnostic can be used for any control module that is not communicating, regardless of the type of serial data circuit it is connected to,

providing the vehicle is equipped with the control module.

Reference Information

Schematic Reference

* Data Communication Schematics (See: Powertrain Management/Computers and Control Systems/Information Bus/Diagrams/Electrical

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DTC Descriptor

DTC U2142 00

- Lost Communication With Yaw Rate Sensor (YRS)

Circuit/System Description

Modules connected to the CAN bus serial data circuits monitor for serial data communications during normal vehicle operation. Operating

information and commands are exchanged among the modules. The modules have prerecorded information about what messages are needed to be

exchanged on the serial data circuits. The messages are supervised and also, some periodic messages are used by the receiver module as an

availability indication of the transmitter module. Each message contains the identification number of the transmitter module.

The electronic brake control module (EBCM) activates the other modules connected to the CAN serial data circuits by applying voltage when the

ignition key is in ACC, ON or START. The EBCM, Yaw Rate and Lateral Acceleration Sensor are the only modules connected to the CAN bus

serial data circuits. For more information on CAN bus serial data refer to Data Link Communications Description and Operation (See: Powertrain

Management/Computers and Control Systems/Information Bus/Description and Operation).

Conditions for Running the DTC

* The system voltage is between 9-16 volts.

* The vehicle power mode master requires serial data communication to occur.

Conditions for Setting the DTC

A supervised periodic message that includes the transmitter module availability has not been received.

Action Taken When the DTC Sets

* The vehicle stability enhancement system (VSES), if equipped, and traction control system (TCS) will not function.

* System OFF lamps will illuminate for these systems.

Conditions for Clearing the DTC

* A current DTC clears when the malfunction is no longer present.

* A history DTC clears when the module ignition cycle counter reaches the reset threshold of 50, without a repeat of the malfunction.

Diagnostic Aids

* Sometimes, while diagnosing a specific customer concern or after a repair, you may notice a history U-code present. However, there is no

associated "current" or "active" status. Loss-of- communication U-codes such as these can set for a variety of reasons. Many times, they are

transparent to the vehicle operator and technician, and/or have no associated symptoms. Eventually, they will erase themselves automatically

after a number of fault-free ignition cycles. This condition would most likely be attributed to one of these scenarios:

- A control module on the data communication circuit was disconnected while the communication circuit is awake.

- Power to one or more modules was interrupted during diagnosis.

- A low battery condition was present, so some control modules stop communicating when battery voltage drops below a certain threshold.

- Battery power was restored to the vehicle and control modules on the communication circuit did not all re-initialize at the same time.

- If a loss-of-communication U-code appears in history for no apparent reason, it is most likely associated with one of the scenarios above.

These are all temporary conditions and should never be interpreted as an intermittent fault, causing you to replace a part.

* A control module may have a U-code stored in history that does not require any repairs. Issues with late or corrupted messages between

control modules can be temporary with no apparent symptom or complaint; this does not mean the control module is faulty. Do not replace a

control module based only on a history U-code.

* Do not replace a control module reporting a U-code. The U-code identifies which control module needs to be diagnosed for a communication

issue.

* Communication may be available between the BCM and the scan tool with either the low or high speed GMLAN serial data system

inoperative. This condition is due to the BCM using both the low and high speed GMLAN systems.

* Use to determine if the module uses high or low speed GMLAN serial data communications.

* Some control modules may not have internal protection for specific control circuits and may open a B+ or ignition fuse. If a fuse is open and

the B+ or ignition circuit is not shorted to ground, ensure none of the control circuits are shorted to ground before replacing the control

module.

* This diagnostic can be used for any control module that is not communicating, regardless of the type of serial data circuit it is connected to,

providing the vehicle is equipped with the control module.

Reference Information

Schematic Reference

* Data Communication Schematics (See: Powertrain Management/Computers and Control Systems/Information Bus/Diagrams/Electrical

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DTC Descriptor

DTC U189A 00

- DC to DC Converter Control Module A Lost Communication With Hybrid Powertrain Control Module

Diagnostic Fault Information

Circuit/System Description

Modules connected to the high and low speed GMLAN serial data circuits monitor for serial data communications during normal vehicle operation.

Operating information and commands are exchanged among the modules. The modules have prerecorded information about what messages are

needed to be exchanged on the serial data circuits, for each virtual network. The messages are supervised and also, some periodic messages are

used by the receiver module as an availability indication of the transmitter module. Each message contains the identification number of the

transmitter module.

The SDGM energizes the wake up signal to activate the accessory DC power control module (APM) and another wake up signal to activate the

hybrid powertrain control module (HPCM) which is inside the drive motor power inverter module (PIM). The HPCM reports all DTC for the APM,

therefore DTC U189A cannot be reported with the HPCM is inoperative.

Conditions for Running the DTC

* The system voltage is between 9-16 volts.

* The vehicle power mode master requires serial data communication to occur.

Conditions for Setting the DTC

* The HPCM does not receive voltage from the SDGM on the wake up signal circuit.

* The wake up circuit between the SDGM and the APM is shorted to voltage.

* Any of the 4 PTLAN circuits connected to the HPCM are open.

Action Taken When the DTC Sets

The modules is never signaled, therefore the specific subsystems may not function. Depending on the fault, the MIL, battery indicator may

illuminate and several DIC messages be present.

Conditions for Clearing the DTC

* A current DTC clears when the malfunction is no longer present.

* A history DTC clears when the module ignition cycle counter reaches the reset threshold of 50, without a repeat of the malfunction.

Diagnostic Aids

* When testing circuits to the SDGM access can be accomplished by removing the instrument panel center trim panel. Note that this procedure

does not allow removal of the SDGM, only access to the connector. Refer to Instrument Panel Center Trim Panel Replacement (Cadillac) (

See: Body and Frame/Interior Moulding / Trim/Dashboard / Instrument Panel/Service and Repair/Instrument Panel Center Trim Panel

Replacement (Cadillac))Instrument Panel Center Trim Panel Replacement (Except Cadillac) (See: Body and Frame/Interior Moulding /

Trim/Dashboard / Instrument Panel/Service and Repair/Instrument Panel Center Trim Panel Replacement (Except Cadillac)).

2010 Cadillac CTS Sedan AWD V6-3.6L Page 177

2010 Cadillac CTS Sedan AWD V6-3.6L Page 177

DTC Descriptor

B0099 00

- Deployment Commanded Circuit

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 discrimination sensor provides discrete force 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 hood actuators deploy only when a

valid signal whose energy is capable of triggering deployment of the hood is present. During a frontal pedestrian impact of sufficient force, the

pedestrian impact detection module will allow current to flow through the deployment loop in order to deploy the hood hinge actuator. The

pedestrian impact detection module provides a minimum of 1.2 amps and a maximum of 1.95 amps of current for a minimum of 2 ms when an

actuator deployment is commanded. The pedestrian impact detection module performs continuous diagnostic tests on the deployment loops to

check for proper circuit continuity. The pedestrian impact detection module sets this DTC in the current ignition cycle when a hood hinge actuator

deployment has been commanded. After a deployment, the hood hinge actuators and the pedestrian impact detection module need to be replaced.

Conditions for Running the DTC

Ignition voltage is between 9-16 volts.

Conditions for Setting the DTC

* The pedestrian impact detection module detects a frontal impact to warrant deployment of the hood hinge actuators.

* The pedestrian impact detection module provides a minimum of 1.2 amps and a maximum of 1.95 amps of current for a minimum of 2 ms to

command deployment of the hood hinge actuators

Action Taken When the DTC Sets

* The pedestrian impact detection module commands the DIC to display Reset Hood See Owners Manual for the following two ignition cycles.

* The pedestrian impact detection module commands the DIC to display Service Pedestrian Protection System at the third ignition cycle after

the hood hinge actuators have been deployed until service is performed.

Conditions for Clearing the DTC

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

* A history DTC will clear once 40 malfunction-free ignition cycles have occurred.

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)

* 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

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DTC Descriptor

DTC P1682

- Ignition 1 Switch Circuit 2

Diagnostic Fault Information

Typical Scan Tool Data

Circuit/System Description

There are 2 ignition voltage circuits supplied to the engine control module (ECM). The first ignition circuit is provided by the powertrain relay,

through a fuse. This ignition voltage circuit supplies power to all the internal ECM circuits associated with the throttle actuator control (TAC)

operation. The second ignition voltage circuit is supplied by the run/crank relay through a fuse, and is used to power the remaining internal ECM

circuits. If the ECM detects a voltage difference between the 2 ignition voltage circuits, DTC P1682 will set.

Conditions for Running the DTC

* The ignition is ON.

* System voltage is more than 7 V.

* The powertrain relay is commanded ON.

* DTC P1682 runs continuously when the above conditions are met.

Conditions for Setting the DTC

The ECM detects that the voltage level difference is greater than 3 V between the 2 ignition 1 voltage circuits for less than 1 s.

Action Taken When the DTC Sets

DTC P1682 is a Type A DTC.

Conditions for Clearing the DTC

DTC P1682 is a Type A DTC.

Diagnostic Aids

This test procedure requires that the vehicle battery has passed a load test and is completely charged. Refer to Battery Inspection/Test (See:

Starting and Charging/Testing and Inspection/Component Tests and General Diagnostics/Battery Inspection/Test).

Reference Information

Schematic Reference

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

* Power Distribution Schematics (See: Diagrams/Electrical Diagrams/Starting and Charging/Power and Ground Distribution/System

Diagram/Power Distribution Schematics)

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/General Electrical Diagnostic Procedures/Circuit

Testing/Circuit Testing)

2010 Cadillac Truck Escalade/ESV RWD V8-6.2L Page 2438

2010 Cadillac Truck Escalade/ESV RWD V8-6.2L Page 2438

DTC Descriptor

DTC P1629

- Theft Deterrent Fuel Enable Signal Not Received

Circuit/System Description

The theft deterrent module (TDM) sends the prerelease password to the engine control module (ECM) via the serial data circuit. The ECM then

sends a challenge to the TDM. Both the ECM and TDM perform a calculation on this challenge. If the calculated response from the TDM equals

the calculation performed by the ECM, the ECM will allow vehicle starting.

Conditions for Running the DTC

* Ignition is in the ACCESSORY or RUN position.

* The ECM is not in learn mode.

Conditions for Setting the DTC

The ECM receives does not receive the challenge response from the TDM within the required amount of time.

Action Taken When the DTC Sets

The security indicator will illuminate.

Conditions for Clearing the DTC

* A current DTC P1629 will be cleared when a challenge response is received.

* A history DTC will be cleared after 40 malfunction-free ignition cycles or when a scan tool is used to clear DTCs.

Diagnostic Aids

DTC P1629 is an indicator that the challenge/response was not received within the required time. This does not necessarily indicate a fault is

present with the TDM or ECM. Factors such as a long engine crank, a delay in the serial data communication, or B-codes set in the TDM will cause

DTC P1629 to set. This DTC should not be used as a fault indicator, but rather as a symptom to assist in the diagnosis of these other systems.

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 (See: Accessories and Optional Equipment/Antitheft and Alarm Systems/Description and

Operation/Immobilizer Description and Operation)

Electrical Information Reference

* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit

Testing/Circuit Testing)

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

Procedures/Connector Repairs/Connector Repairs)

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

Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)

* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring

Repairs/Wiring Repairs)

Scan Tool Reference

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

P1631

DTC P1631

Diagnostic Instructions

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DTC Descriptor

DTC P0969

- Pressure Control (PC) Solenoid 3 System Performance

DTC P0970

- Pressure Control (PC) Solenoid 3 Control Circuit Low Voltage

DTC P0971

- Pressure Control (PC) Solenoid 3 Control Circuit High Voltage

Diagnostic Fault Information

Typical Scan Tool Data

Circuit/System Description

The clutch pressure control solenoid 3 is part of the control solenoid valve assembly and is not serviced separately. The transmission control

module supplies 12 volts to the clutch pressure control solenoid 3 on the high side driver 1 circuit. The transmission control module controls the

clutch pressure control solenoid 3 through the clutch pressure control solenoid 3 control circuit. The normally high clutch pressure control solenoid

3 controls fluid to the hybrid low, 1-2 and the 4th clutch assemblies when commanded ON and exhausts fluid when commanded OFF. The clutch

pressure control solenoid 3 regulates the transmission fluid pressure to the hybrid low, 1-2 and the 4th clutch assemblies.

Conditions for Running the DTC

* The engine run time is greater than 5 seconds.

* The vehicle speed is less than 200 km/h (124 mph) for 5 seconds.

* The system voltage is 11-18 V.

Conditions for Setting the DTC

P0969

The transmission control module detects an internal electrical performance malfunction of the clutch pressure control solenoid control circuit when

the actual hybrid low, 1-2 and the 4th clutch pressure does not equal the commanded hybrid low, 1-2 and 4th clutch pressure for 300 milliseconds.

P0970

The transmission control module detects an internal low voltage electrical malfunction of the clutch PC solenoid control circuit for 500

milliseconds.

P0971

The transmission control module detects an internal high voltage electrical malfunction of the clutch PC solenoid control circuit for 500

milliseconds.

Action Taken When the DTC Sets

* DTC P0969 is a Type B DTC.

* DTCs P0970 and P0971 are Type A DTCs.

* The transmission control module defaults the transmission to a limited shift pattern utilizing 2 forward gears and reverse based on the default

detected.

* The transmission control module commands maximum line pressure.

* The transmission control module freezes transmission adaptive functions.

Conditions for Clearing the DTC

* DTC P0969 is a Type B DTC.

* DTCs P0970 and P0971 are Type A DTCs.

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DTC Descriptor

DTC P0965

- Pressure Control (PC) Solenoid 2 System Performance

DTC P0966

- Pressure Control (PC) Solenoid 2 Control Circuit Low Voltage

DTC P0967

- Pressure Control (PC) Solenoid 2 Control Circuit High Voltage

Diagnostic Fault Information

Typical Scan Tool Data

Circuit/System Description

The clutch pressure control solenoid 2 is part of the control solenoid valve assembly and is not serviced separately. The transmission control

module supplies 12 volts to the clutch pressure control solenoid 2 on the high side driver 2 circuit. The transmission control module controls the

pressure control solenoid 2 through the clutch pressure control solenoid 2 control circuit. The normally high clutch pressure control solenoid 2

flows fluid to the hybrid direct, 2-3-4 clutch and drive motor 2 when commanded ON.

Conditions for Running the DTC

* The engine run time is greater than 5 seconds.

* The vehicle speed is less than 200 km/h (124 mph) for 5 seconds.

* The system voltage is 11-18 V.

Conditions for Setting the DTC

P0965

The transmission control module detects an internal electrical performance malfunction of the clutch pressure control solenoid control circuit when

the actual hybrid direct, 2-3-4 clutch pressure does not equal the commanded hybrid direct, 2-3-4 clutch pressure for 5 seconds.

P0966

The transmission control module detects an internal low voltage electrical malfunction of the clutch pressure control solenoid control circuit for 500

milliseconds.

P0967

The transmission control module detects an internal high voltage electrical malfunction of the clutch pressure control solenoid control circuit for

500 milliseconds.

Action Taken When the DTC Sets

* DTC P0965 is a Type B DTC.

* DTCs P0966 and P0967 are Type A DTCs.

* The transmission control module defaults the transmission to a limited shift pattern utilizing 2 forward gears and reverse based on the fault

detected.

* The transmission control module commands maximum line pressure.

* The transmission control module freezes transmission adaptive functions.

Conditions for Clearing the DTC

* DTC P0965 is a Type B DTC.

* DTCs P0966 and P0967 are Type A DTCs.

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DTC Descriptor

DTC P0757

- Shift Solenoid (SS) 2 Valve Performance - Stuck On

Circuit/System Description

The shift solenoid valve 2 and transmission control module are part of the control solenoid valve assembly and are not serviced separately. The shift

solenoid valve 2 is a normally closed solenoid valve and controls fluid to the hybrid low, 1-2 clutch boost valve assembly and related clutches.

During this diagnostic test, intrusive actions are taken by the transmission control module to test the shift solenoid valve 2 to see if the valve is

stuck ON. When in gear 3, gear 4, or EVT 2, if the correct gear ratio is not achieved in a predetermined period of time, the transmission control

module commands second gear and if second gear ratio is attained this indicates a stuck ON shift solenoid valve 2 and the DTC will set.

Conditions for Running the DTC

EVT 1 or EVT 2 is commanded.

Conditions for Setting the DTC

The transmission control module detects shift solenoid valve 2 is ON when commanded OFF.

Action Taken When the DTC Sets

P0757 is a Type B DTC.

Conditions for Clearing the DTC

P0757 is a Type B DTC.

Reference Information

DTC Type Reference

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

(DTC) Type Definitions)

Circuit/System Verification

1. Verify that P0721, P0722, P0723, P0966, P0967, P0969, P0970, P0971, P0973, P0974, P0976, P0977, P2720, P2721, P2728, P2729, or

P2730 is not set.

瀚慖f any 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. Perform the Transmission Fluid Level and Condition Check (See: Transmission and Drivetrain/Automatic Transmission/Transaxle/Testing

and Inspection/Symptom Related Diagnostic Procedures/2ML70 - Automatic Transmission/Transmission Fluid Level and Condition Check).

3. Perform the Line Pressure Check (See: Transmission and Drivetrain/Automatic Transmission/Transaxle/Testing and Inspection/Component

Tests and General Diagnostics/2ML70 - Automatic Transmission/Line Pressure Check).

4. Perform the Control Solenoid Valve and Transmission Control Module Assembly Inspection (See: Transmission and Drivetrain/Automatic

Transmission/Transaxle/Testing and Inspection/Component Tests and General Diagnostics/2ML70 - Automatic Transmission/Control

Solenoid Valve and Transmission Control Module Assembly Inspection).

5. Perform the Control Solenoid Valve and Transmission Control Module Assembly Solenoid Performance Test (See: Transmission and

Drivetrain/Automatic Transmission/Transaxle/Testing and Inspection/Component Tests and General Diagnostics/2ML70 - Automatic

Transmission/Control Solenoid Valve and Transmission Control Module Assembly Solenoid Performance Test).

瀚慖f the shift solenoid 2 is found to be leaking or stuck ON, replace the control solenoid valve assembly.

瀚慖f the control solenoid valve assembly tests normal, inspect the valve body and hydraulic circuits for a leak or a stuck valve.

6. 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 Module References (See: Testing and Inspection/Programming and Relearning) for control solenoid valve assembly replacement,

setup, and programming.

* Control Valve Upper Body Replacement (See: Transmission and Drivetrain/Automatic Transmission/Transaxle/Valve Body/Service and

Repair/2ML70 - Automatic Transmission) for control valve body repair or replacement.

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2010 Cadillac Truck Escalade/ESV RWD V8-6.2L Page 2191

DTC Descriptor

DTC P0621

- Generator L-Terminal Circuit

Diagnostic Fault Information

Circuit/System Description

The engine control module (ECM) uses the charge indicator control circuit, or L-terminal circuit, to control the load of the generator on the engine.

A high side driver in the ECM applies a voltage to the voltage regulator. This signals the voltage regulator to turn the field circuit ON and OFF.

The ECM monitors the state of the charge indicator control circuit.

Conditions for Running the DTC

* The engine is running.

* No generator, CKP sensors, CMP sensor DTCs are set.

Conditions for Setting the DTC

The charge indicator control circuit is shorted to ground or shorted to voltage for 20 seconds.

Action Taken When the DTC Sets

* The charge indicator turns ON.

* The driver information center (DIC) displays the SERVICE BATTERY CHARGING SYSTEM message.

Conditions for Clearing the DTC

* The DTC will pass when the condition for setting the DTC is no longer present for 2 seconds.

* A history DTC will clear after 40 consecutive warm-up cycles have occurred without a malfunction.

* The charge indicator and DIC message will remain ON until the DTC passes or is cleared, even if the ignition is cycled.

Reference Information

Schematic Reference

Starting and Charging Schematics (See: Starting and Charging/Diagrams/Electrical Diagrams)

Connector End View Reference

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

Description and Operation

Charging System Description and Operation (See: Starting and Charging/Charging System/Description and Operation)

Electrical Information Reference

* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit

Testing/Circuit Testing)

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

Procedures/Connector Repairs/Connector Repairs)

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

Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)

* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/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. Verify that a test lamp illuminates between the G13 generator B+ terminal 1 X2 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.

2010 Cadillac CTS Sedan AWD V6-3.6L Page 542

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DTC Descriptor

DTC B2996 00

- Left Rear Door Ajar Circuit

DTC B3001 00

- Right Rear Door Ajar Circuit

Diagnostic Fault Information

Circuit/System Description

The body control module (BCM) monitors the rear door ajar circuits to indicate the status of the rear doors. When the respective door is opened, the

door ajar signal circuit is switched to ground by the door lock ajar indicator switch, the BCM detects the drop in voltage in the circuit and then

communicates this status to the instrument panel cluster (IPC) via a serial data message. The IPC, upon receipt of this serial data message, will

illuminate the appropriate ajar message in the driver information center (DIC) and when the transaxle is shifted out of PARK, the DIC will also

send a serial data message to the radio to activate the door ajar audible warning.

Conditions for Running the DTC

The system voltage is 9-18 volts.

Conditions for Setting the DTC

The BCM detects a short to ground in a rear door ajar circuit for longer than 10 minutes.

Action Taken When the DTC Sets

The appropriate door ajar indicator is continuously illuminated.

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

Luggage Compartment Description and Operation (See: Body and Frame/Doors, Hood and Trunk/Trunk / 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)

2010 Cadillac CTS Sedan AWD V6-3.6L Page 222

2010 Cadillac CTS Sedan AWD V6-3.6L Page 222

DTC Descriptor

DTC B396E 02

- Power Liftgate Shutface Circuit Switch Short To Ground

Diagnostic Fault Information

Circuit/System Description

The power liftgate shutface switch circuit provides a single input to the liftgate module (LGM). The shutface switch is supplied a signal voltage,

when the switch contact closes, the LGM detects the voltage drop and commands the liftgate to close.

Conditions for Running the DTC

The system voltage is 9-16 volts.

Conditions for Setting the DTC

The liftgate module detects the Liftgate Close Signal circuit is active for greater than 10 minutes.

Action Taken When the DTC Sets

The liftgate will be inoperative in the power mode and 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.

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

In some circumstances high or low control circuit faults may cause the LGM to react as if the liftgate has encountered an object in its travel and

reverse direction.

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