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‌SPECIFICATIONS

FASTENER SPECIFICATIONS

BRAKES

Park Brake - Volt

Single Use Non-Threaded Fasteners/Components

Reusable Threaded Fastener Tightening Specifications

SCHEMATIC WIRING DIAGRAMS

PARK BRAKE SYSTEM WIRING SCHEMATICS

Park Brake

Fig. 1: Park Brake

Courtesy of GENERAL MOTORS COMPANY

DIAGNOSTIC INFORMATION AND PROCEDURES

DTC C1138: SUPPLY VOLTAGE GOES BELOW 7 V AND ABOVE 16.5 V/SIGNAL PERFORMANCE

Diagnostic Instructions

Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Review Strategy Based Diagnosis for an overview of the diagnostic approach.

Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC Descriptors

DTC C1138 03

Supply Voltage Goes Below 7 V

DTC C1138 07

Supply Voltage Goes Above 16.5 V

DTC C1138 58

Signal Performance

Diagnostic Fault Information

Circuit/System Description

The Electronic Brake Control Module monitors its supply voltage to verify the supply voltage is within the normal operating range

Conditions for Running the DTC

The ignition is ON. Conditions for Setting the DTC DTC C1138 03

The EBCM detects its supply voltage of less than approximately 7 V.

DTC C1138 07

The EBCM detects a supply voltage of more than 16.5 V.

DTC C1138 58

The Park Brake Controller (PBC) loses communication with the EBCM during park brake actuation.

Action Taken When the DTC Sets

DTC is stored in memory.

Park brake actuation unavailable.

Conditions for Clearing the DTC

The supply voltage returns to normal operating range.

Diagnostic Aids

A high or low voltage DTC set or voltage value in multiple modules/sensors indicates a concern in the charging system.

A possible cause of this DTC could be overcharging with a battery charger or jump starting.

Reference Information

Schematic Reference

Park Brake System Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Description and Operation

Electronic Parking Brake Description

Electrical Information Reference

Circuit Testing

Connector Repairs

Testing for Intermittent Conditions and Poor Connections Wiring Repairs

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

1. Verify that no other DTCs are set.

If any other DTCs are set

Refer to Diagnostic Trouble Code (DTC) List - Vehicle .

If no other DTCs are set

2. Vehicle OFF, measure and record the battery voltage at the battery terminals.

3. Verify the battery voltage stabilizes between 12.4 V and 12.8 V within a few minutes of turning the vehicle OFF.

If battery voltage is less than 12.4 V or more than 12.8 V

Refer to Battery Inspection/Test .

If battery voltage is between 12.4 and 12.8 V

4. Engine running, headlights ON, measure and record the battery voltage at the battery terminals.

5. Verify the voltage is at least 1 V greater than the voltage measured in step 1, but less than 15 V.

If the voltage is not at least 1 V greater than the voltage measured in step 2 or is greater than 15 V.

Refer to Charging System Test .

If the voltage is at least 1 V greater than the voltage measured in step 2, but less than 15 V.

6. Verify the K17 Electronic Brake Control Module scan tool ignition voltage parameter is within 1 V of the battery voltage.

If not within 1 V of the battery voltage

Refer to Circuit/System Testing.

If within 1 V of the battery voltage

7. All OK.

Circuit/System Testing

NOTE: You must perform the Circuit/System Verification before Circuit/System Testing.

Some control module ground circuits may require up to 20 min after the ignition is turned off before achieving a resistance reading of less than 5 Ω. In most cases the readings will drop below 20 Ω within 1 min indicating the control module is going to sleep.

DTC C1138 03 or DTC C1138 07

1. Ignition OFF and all vehicle systems OFF, disconnect the X1 harness connector at the K17 Electronic Brake Control Module. It may take up to 2 min for all vehicle systems to power down.

2. Test for less than 10 Ω between ground circuit terminal 46 and ground.

If 10 Ω or greater

1. Ignition OFF.

2. Test for less than 2 Ω in the ground circuit end to end.

If 2 Ω or greater, repair the open/high resistance in the circuit.

If less than 2 Ω, repair the open/high resistance in the ground connection.

If less than 10 Ω

3. Verify a test lamp illuminates between B+ circuit terminal 1 and ground.

If the test lamp does not illuminate and the circuit fuse is good

1. Ignition OFF.

2. Test for less than 2 Ω in the B+ circuit end to end.

If 2 Ω or greater, repair the open/high resistance in the circuit.

If less than 2 Ω, verify the fuse is not open and there is voltage at the fuse.

If the test lamp does not illuminate and the circuit fuse is open

1. Ignition OFF.

2. Test for infinite resistance between the B+ circuit and ground.

If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance, replace the K17 Electronic Brake Control Module.

If the test lamp illuminates

4. Replace the K17 Electronic Brake Control Module.

DTC C1138 58

1. Verify that no other DTCs are set.

If any other DTCs are set

Refer to Diagnostic Trouble Code (DTC) List - Vehicle .

If no other DTCs are set

2. Using the S91 Park Brake Control Switch, apply and release the park brake.

3. Verify that the DTC does not reset.

If the DTC resets

Replace the K17 Electronic Brake Control Module.

If the DTC does not reset

4. All OK.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

Control Module References for control module replacement, programming and setup.

DTC C1148: LEFT PARK BRAKE ACTUATOR CIRCUIT

Diagnostic Instructions

Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Review Strategy Based Diagnosis for an overview of the diagnostic approach.

Diagnostic Procedure Instructions provide an overview of each diagnostic category.

DTC Descriptors

DTC C1148

Left Park Brake Actuator Circuit

For symptom byte information, refer to: Symptom Byte List

Diagnostic Fault Information

Circuit/System Description

The Electronic Brake Control Module will diagnose the park brake motor circuits to verify that they are functioning properly. The park brake motor circuits are used to command actuator motor operation, which will apply and release the parking brake. These circuits are used to activate the actuator, which applies or releases pressure on the rear caliper pistons, ultimately applying and releasing the park brake.

When the Park Brake Switch is pulled, a signal is sent to the Electronic Brake Control Module which will supply 12 V to the apply control circuits and ground to the release control circuits which will cause the left and

right park brake actuators to activate causing the park brakes to engage. When the Park Brake Switch is pressed, a signal is sent to the Electronic Brake Control Module which will supply 12 V to the released control circuits and ground to the apply control circuits which will cause the left and right park brake actuators to activate causing the park brakes to release.

Conditions for Running the DTC

Vehicle ON or in SERVICE MODE. Battery voltage is between 9 - 16 V

Conditions for Setting the DTC

The Electronic Brake Control Module detects a malfunction in the left park brake actuator or its circuits.

Action Taken When the DTC Sets

The parking brake is disabled, one release allowed.

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

Conditions for Clearing the DTC

The Electronic Brake Control Module will clear the DTC after 40 consecutive ignition on/off cycles with at least one test pass in each ignition cycle and no test fail result.

The condition for the DTC is no longer present.

Diagnostic Aids

After repairing any fault, the DTC will still be set as current and the park brakes will not function. It is necessary to clear the DTC with a scan tool in order to place the DTC in history and regain park brake function.

Reference Information

Schematic Reference

Park Brake System Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Description and Operation

Electronic Parking Brake Description

Electrical Information Reference

Circuit Testing

Connector Repairs

Testing for Intermittent Conditions and Poor Connections Wiring Repairs

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

1. Verify the M104L Park Brake Actuator - Left apply when pulling the S91 Park Brake Switch.

If the M104L Park Brake Actuator - Left does not apply

Refer to the Circuit/System Testing.

If the M104L Park Brake Actuator - Left does apply

2. Verify the M104L Park Brake Actuator - Left release when pressing the S91 Park Brake Switch.

If the M104L Park Brake Actuator - Left does not release

Refer to the Circuit/System Testing.

If the M104L Park Brake Actuator - Left does release

3. All OK.

Circuit/System Testing

NOTE: It is necessary to clear the DTC after any repair is made to regain park brake output control and have the DTC to set as history.

1. Ignition OFF, disconnect the harness connector at the M104L Park Brake Actuator - Left and the harness connector at the K17 Electronic Brake Control Module. Ignition ON

2. Test for less than 1 V between the K17 Electronic Brake Control Module harness connector terminals listed below and ground:

Terminal 12

Terminal 13

If 1 V or greater

Repair the short to voltage on the circuit.

If less than 1 V

3. Ignition OFF.

4. Test for infinite resistance between the K17 Electronic Brake Control Module harness connector terminals listed below and ground:

Terminal 12

Terminal 13

If less than infinite resistance

Repair the short to ground on the circuit.

If infinite resistance

5. Test for less than 2 Ω between the M104L Park Brake Actuator - Left harness connector terminal 1 and

the K17 Electronic Brake Control Module harness connector terminal 13

If 2 Ω or greater

Repair the open/high resistance in the circuit.

If less than 2 Ω

6. Test for less than 2 Ω between the M104L Park Brake Actuator - Left harness connector terminal 2 and the K17 Electronic Brake Control Module harness connector terminal 12

If 2 Ω or greater

Repair the open/high resistance in the circuit.

If less than 2 Ω

7. Install a 25 A fused jumper wire between one of the control terminals at the M104L Park Brake Actuator

- Left and 12 V. Momentarily install a jumper wire between the other control terminal and ground. Reverse the jumper wires at least two times, the M104L Park Brake Actuator - Left should perform the apply and release function.

If the actuator does not perform the apply and release function

Replace the M104L Park Brake Actuator - Left.

If the actuator performs the apply and release function

8. Replace the K17 Electronic Brake Control Module.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

Rear Parking Brake Actuator Replacement

Control Module References for control module replacement, programming and setup

DTC C114C: PARK BRAKE SWITCH CIRCUIT

Diagnostic Instructions

Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Review Strategy Based Diagnosis for an overview of the diagnostic approach.

Diagnostic Procedure Instructions provide an overview of each diagnostic category.

DTC Descriptors

DTC C114C

Park Brake Switch Circuit

For symptom byte information, refer to: Symptom Byte List

Diagnostic Fault Information

Circuit/System Description

The parking brake function is integrated into the Electronic Brake Control Module. The Electronic Brake Control Module contains the logic for applying and releasing the parking brake when commanded by the Park Brake Switch. The Electronic Brake Control Module will perform diagnostics on the Park Brake Switch and its wiring harness to verify it is functioning properly.

The Park Brake Switch diagnostic checks for failure conditions in the Park Brake Switch and associated wiring into the Electronic Brake Control Module.

Conditions for Running the DTC Vehicle ON or in SERVICE MODE. Conditions for Setting the DTC

The Electronic Brake Control Module detects a short to battery, short to ground, open circuit, or an internal Parking Brake Control Switch malfunction. The Electronic Brake Control Module detects the apply or release button was activated for more than 90 s.

Action Taken When the DTC Sets

The parking brake is disabled.

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

Conditions for Clearing the DTC

The Electronic Brake Control Module will clear the DTC after 40 consecutive Vehicle on/off cycles with at least one test pass in each Vehicle cycle and no test fail result.

The condition for the DTC is no longer present.

The Park Brake Switch button is INACTIVE using the scan tool without the switch being activated.

Reference Information

Schematic Reference

Park Brake System Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Description and Operation

Electronic Parking Brake Description

Electrical Information Reference

Circuit Testing

Connector Repairs

Testing for Intermittent Conditions and Poor Connections Wiring Repairs

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

1. Vehicle ON.

2. Verify the scan tool Park Brake Switch parameter changes between Released and Apply while pressing and releasing the S91 Park Brake Switch.

If the parameter does not change

Refer to Circuit/System Test.

If the parameter changes

3. All OK.

Circuit/System Test

1. Vehicle OFF, disconnect the harness connector at the K17 Electronic Brake Control Module. Vehicle ON.

2. Test for less than 1 V between each circuit terminals listed below and ground; Terminal 16

Terminal 32

Terminal 9

Terminal 15

Terminal 31

Terminal 8

If 1 V or greater

Repair the short to voltage on the circuit.

If less than 1 V

3. Vehicle OFF.

4. Test for infinite resistance between the circuit terminals listed below and ground; Terminal 16

Terminal 32

Terminal 9

Terminal 15

Terminal 31

Terminal 8

If less than infinite resistance

Repair the short to ground on the circuit.

If infinite resistance

5. Test for less than 5 Ω between the circuit terminal 32 and the circuit terminal 31.

If 5 Ω or greater

1. Vehicle OFF, disconnect the harness connector at the S91 Park Brake Switch.

2. Test for less than 2 Ω in the circuits end to end.

If 2 Ω or greater, repair the open/high resistance in the circuit. If less than 2 Ω, replace the S91 Park Brake Switch.

If less than 5 Ω

6. Test for less than 5 Ω between the circuit terminal 8 and the circuit terminal 15.

If 5 Ω or greater

1. Vehicle OFF, disconnect the harness connector at the S91 Park Brake Switch.

2. Test for less than 2 Ω in the circuits end to end.

If 2 Ω or greater, repair the open/high resistance in the circuit. If less than 2 Ω, replace the S91 Park Brake Switch.

If less than 5 Ω

7. Test for less than 5 Ω between the circuit terminal 16 and the circuit terminal 9.

If 5 Ω or greater

1. Vehicle OFF, disconnect the harness connector at the S91 Park Brake Switch.

2. Test for less than 2 Ω in the circuits end to end.

If 2 Ω or greater, repair the open/high resistance in the circuit. If less than 2 Ω, replace the S91 Park Brake Switch.

If less than 5 Ω

8. Test for less than 5 Ω between the circuit terminal 9 and the circuit terminal 31 while closing the switch.

If 5 Ω or greater

Replace the S91 Park Brake Switch.

If less than 5 Ω

9. Test for less than 5 Ω between the circuit terminal 9 and the circuit terminal 15 while closing the switch.

If 5 Ω or greater

Replace the S91 Park Brake Switch.

If less than 5 Ω

10. Vehicle OFF, all access doors closed, all vehicle systems OFF, disconnect the harness connector at the S91 Park Brake Switch.

11. Test for less than 10 Ω between the ground circuit terminal 8 at the S91 Park Brake Switch and ground.

If 10 Ω or greater

1. Vehicle OFF.

2. Test for less than 2 Ω in the ground circuit end to end.

If 2 Ω or greater, repair the open/high resistance in the circuit.

If less than 2 Ω, repair the open/high resistance in the ground connection.

If less than 10 Ω

12. Replace the S91 Park Brake Switch.

13. Verify that DTC C114C does not set while operating the vehicle within the Conditions for Running the DTC.

If the DTC sets

Replace the K17 Electronic Brake Control Module.

If DTC does not set

14. All OK.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

Parking Brake Actuator Switch Replacement

Control Module References for control module replacement, programming and setup.

DTC C1586: RIGHT PARK BRAKE ACTUATOR CIRCUIT

Diagnostic Instructions

Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Review Strategy Based Diagnosis for an overview of the diagnostic approach.

Diagnostic Procedure Instructions provide an overview of each diagnostic category.

DTC Descriptors

DTC C1586

Right Park Brake Actuator Circuit

For symptom byte information, refer to: Symptom Byte List

Diagnostic Fault Information

Circuit/System Description

The Electronic Brake Control Module will diagnose the park brake motor circuits to verify that they are functioning properly. The park brake motor circuits are used to command actuator motor operation, which will apply and release the parking brake. These circuits are used to activate the actuator, which applies or releases pressure on the rear caliper pistons, ultimately applying and releasing the park brake.

When the Park Brake Switch is pulled, a signal is sent to the Electronic Brake Control Module which will supply 12 V to the apply control circuits and ground to the release control circuits which will cause the left and right park brake actuators to activate causing the park brakes to engage. When the Park Brake Switch is pressed, a signal is sent to the Electronic Brake Control Module which will supply 12 V to the released control circuits and ground to the apply control circuits which will cause the left and right park brake actuators to activate causing the park brakes to release.

Conditions for Running the DTC

Vehicle ON or in SERVICE MODE. Battery voltage is between 9 - 16 V

Conditions for Setting the DTC

The Electronic Brake Control Module detects a malfunction in the right park brake actuator or its circuits.

Action Taken When the DTC Sets

The parking brake is disabled, one release allowed.

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

Conditions for Clearing the DTC

The Electronic Brake Control Module will clear the DTC after 40 consecutive ignition on/off cycles with at least one test pass in each ignition cycle and no test fail result.

The condition for the DTC is no longer present.

Diagnostic Aids

After repairing any fault, the DTC will still be set as current and the park brakes will not function. It is necessary to clear the DTC with a scan tool in order to place the DTC in history and regain park brake function.

Reference Information

Schematic Reference

Park Brake System Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Description and Operation

Electronic Parking Brake Description

Electrical Information Reference

Circuit Testing

Connector Repairs

Testing for Intermittent Conditions and Poor Connections Wiring Repairs

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

1. Verify the M104R Park Brake Actuator - Right apply when pulling the S91 Park Brake Switch.

If the M104R Park Brake Actuator - Right does not apply

Refer to the Circuit/System Testing.

If the M104R Park Brake Actuator - Right does apply

2. Verify the M104R Park Brake Actuator - Right release when pressing the S91 Park Brake Switch.

If the M104R Park Brake Actuator - Right does not release

Refer to the Circuit/System Testing.

If the M104R Park Brake Actuator - Right does release

3. All OK.

Circuit/System Testing

NOTE: It is necessary to clear the DTC after any repair is made to regain park brake output control and have the DTC to set as history.

1. Ignition OFF, disconnect the harness connector at the M104R Park Brake Actuator - Right and the harness connector at the K17 Electronic Brake Control Module. Ignition ON

2. Test for less than 1 V between the K17 Electronic Brake Control Module harness connector terminals listed below and ground:

Terminal 2

Terminal 3

If 1 V or greater

Repair the short to voltage on the circuit.

If less than 1 V

3. Ignition OFF.

4. Test for infinite resistance between the K17 Electronic Brake Control Module harness connector terminals listed below and ground:

Terminal 2

Terminal 3

If less than infinite resistance

Repair the short to ground on the circuit.

If infinite resistance

5. Test for less than 2 Ω between the M104R Park Brake Actuator - Right harness connector terminal 1 and the K17 Electronic Brake Control Module harness connector terminal 2

If 2 Ω or greater

Repair the open/high resistance in the circuit.

If less than 2 Ω

6. Test for less than 2 Ω between the M104R Park Brake Actuator - Right harness connector terminal 2 and the K17 Electronic Brake Control Module harness connector terminal 3

If 2 Ω or greater

Repair the open/high resistance in the circuit.

If less than 2 Ω

7. Install a 25 A fused jumper wire between one of the control terminals at the M104R Park Brake Actuator

- Right and 12 V. Momentarily install a jumper wire between the other control terminal and ground. Reverse the jumper wires at least two times, the M104R Park Brake Actuator - Right should perform the apply and release function.

If the actuator does not perform the apply and release function

Replace the M104R Park Brake Actuator - Right.

If the actuator performs the apply and release function

8. Replace the K17 Electronic Brake Control Module.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

Rear Parking Brake Actuator Replacement

Control Module References for control module replacement, programming and setup

DTC C1587: LEFT PARK BRAKE ACTUATOR

Diagnostic Instructions

Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Review Strategy Based Diagnosis for an overview of the diagnostic approach.

Diagnostic Procedure Instructions provide an overview of each diagnostic category.

DTC Descriptors

DTC C1587

Left Park Brake Actuator

For symptom byte information, refer to: Symptom Byte List

Circuit/System Description

The Electronic Brake Control Module will diagnose the park brake motor circuits to verify that they are functioning properly. The park brake motor circuits are used to command actuator motor operation, which will apply and release the parking brake. These circuits are used to activate the actuator, which applies or releases pressure on the rear caliper pistons, ultimately applying and releasing the park brake.

When the Park Brake Switch is pulled, a signal is sent to the Electronic Brake Control Module which will supply 12 V to the apply control circuits and ground to the release control circuits which will cause the left and right park brake actuators to activate causing the park brakes to engage. When the Park Brake Switch is pressed, a signal is sent to the Electronic Brake Control Module which will supply 12 V to the released control circuits and ground to the apply control circuits which will cause the left and right park brake actuators to activate causing the park brakes to release.

Conditions for Running the DTC

Vehicle ON or in SERVICE MODE. Battery voltage is between 9 - 16 V

Conditions for Setting the DTC

The Electronic Brake Control Module detects a malfunction in the left park brake actuator.

Action Taken When the DTC Sets

The parking brake is disabled, one release allowed.

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

Conditions for Clearing the DTC

The Electronic Brake Control Module will clear the DTC after 40 consecutive ignition on/off cycles with at least one test pass in each ignition cycle and no test fail result.

The condition for the DTC is no longer present.

Reference Information

Schematic Reference

Park Brake System Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Description and Operation

Electronic Parking Brake Description

Electrical Information Reference

Circuit Testing

Connector Repairs

Testing for Intermittent Conditions and Poor Connections Wiring Repairs

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

1. Vehicle ON.

2. Verify that DTC C1587 is not set.

If the DTC is set

1. Perform the Park Brake Calibration learn procedure. Refer to Park Brake Calibration.

2. Ignition ON.

3. Apply and release the park brake.

4. Verify the DTC is not set.

If the DTC is set, replace the M104L Park Brake Actuator - Left. If the DTC is not set

5. All OK.

If the DTC is not set

3. All OK.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

Rear Parking Brake Actuator Replacement

Control Module References for control module replacement, programming and setup

DTC C1588: RIGHT PARK BRAKE ACTUATOR

Diagnostic Instructions

Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Review Strategy Based Diagnosis for an overview of the diagnostic approach.

Diagnostic Procedure Instructions provide an overview of each diagnostic category.

DTC Descriptors

DTC C1588

Right Park Brake Actuator

For symptom byte information, refer to: Symptom Byte List

Circuit/System Description

The Electronic Brake Control Module will diagnose the park brake motor circuits to verify that they are functioning properly. The park brake motor circuits are used to command actuator motor operation, which will apply and release the parking brake. These circuits are used to activate the actuator, which applies or releases pressure on the rear caliper pistons, ultimately applying and releasing the park brake.

When the Park Brake Switch is pulled, a signal is sent to the Electronic Brake Control Module which will supply 12 V to the apply control circuits and ground to the release control circuits which will cause the left and right park brake actuators to activate causing the park brakes to engage. When the Park Brake Switch is pressed, a signal is sent to the Electronic Brake Control Module which will supply 12 V to the released control circuits and ground to the apply control circuits which will cause the left and right park brake actuators to activate causing the park brakes to release.

Conditions for Running the DTC

Vechicle ON or in SERVICE MODE. Battery voltage is between 9 - 16 V

Conditions for Setting the DTC

The Electronic Brake Control Module detects a malfunction in the right park brake actuator.

Action Taken When the DTC Sets

The parking brake is disabled, one release allowed.

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

Conditions for Clearing the DTC

The Electronic Brake Control Module will clear the DTC after 40 consecutive ignition on/off cycles with at least one test pass in each ignition cycle and no test fail result.

The condition for the DTC is no longer present.

Reference Information

Schematic Reference

Park Brake System Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Description and Operation

Electronic Parking Brake Description

Electrical Information Reference

Circuit Testing

Connector Repairs

Testing for Intermittent Conditions and Poor Connections Wiring Repairs

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

1. Vehicle ON.

2. Verify that DTC C1588 is not set.

If the DTC is set

1. Perform the Park Brake Calibration learn procedure. Refer to Park Brake Calibration.

2. Ignition ON.

3. Apply and release the park brake.

4. Verify the DTC is not set.

If the DTC is set, replace the M104R Park Brake Actuator - Right. If the DTC is not set

5. All OK.

If the DTC is not set

3. All OK.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

Rear Parking Brake Actuator Replacement

Control Module References for control module replacement, programming and setup

SYMPTOMS - PARK BRAKE

NOTE: Review the system operation in order to familiarize yourself with the system functions.

Refer to Park Brake System Diagnosis.

1. Inspect for aftermarket devices which could affect the operation of the park brake system.

2. Inspect the easily accessible or visible system components for obvious damage or conditions which could cause the symptom.

3. Listen to working noise in both parking brake actuators during pushing the parking brake indictor switch.

If no noises occur, check the fuse.

4. Perform a test with a scan tool.

PARK BRAKE WILL NOT HOLD OR RELEASE

PARK BRAKE SYSTEM DIAGNOSIS

REPAIR INSTRUCTIONS

PARK BRAKE CALIBRATION

1. Block the drive wheels.

2. Install a scan tool to the vehicle.

3. Turn the ignition switch to the ON/RUN position with the engine OFF.

4. Select Configuration/Reset Functions from the electronic brake control module menu.

5. Perform the parking brake calibration procedure.

PARKING BRAKE ACTUATOR SWITCH REPLACEMENT

Removal Procedure

1. Remove Front Floor Console Accessory Trim Plate Replacement

Fig. 2: Electrical Connector And Parking Brake Switch Courtesy of GENERAL MOTORS COMPANY

2. Disconnect Electrical Connector (2) @Parking Brake Switch (1)

3. Remove Parking Brake Switch (1)

Installation Procedure

Fig. 3: Electrical Connector And Parking Brake Switch Courtesy of GENERAL MOTORS COMPANY

1. Install Parking Brake Switch (1)

2. Connect Electrical Connector (2) @Parking Brake Switch (1)

3. Install Front Floor Console Accessory Trim Plate Replacement

REAR PARKING BRAKE ACTUATOR REPLACEMENT

Removal Procedure

WARNING: Brake Fluid Irritant Warning

WARNING: Use of eye goggles is necessary to prevent personal injury. CAUTION: Brake Fluid Effects on Paint and Electrical Components Caution

1. Set the parking brake in service mode. With Scan Tool.

1. Connect the scan tool.

2. Ignition ON, engine OFF.

3. Select Electronic Brake Control Module.

4. Select Control Functions.

NOTE: Do not apply any brake pressure during the following step.

5. Select Rear Brake Caliper Piston Retract.

2. Turn OFF the ignition.

3. Raise and support the vehicle. Lifting and Jacking the Vehicle .

4. Remove the rear tire and wheel assemblies. Tire and Wheel Removal and Installation .

Fig. 4: Brake Hose, Fitting Bolt And Sealing Washers Courtesy of GENERAL MOTORS COMPANY

5. Remove Brake Hose Fitting Bolt (1) @Rear Brake Caliper

6. Remove Brake Hose (2) @Rear Brake Caliper

7. Cap the brake caliper inlet port to prevent brake fluid loss and contamination.

8. Cap the brake hose fitting to prevent brake fluid loss and contamination.

9. DISCARD the brake hose fitting gaskets. (3)

Fig. 5: Brake Caliper Assembly And Lectrical Connector Courtesy of GENERAL MOTORS COMPANY

10. Disconnect the electrical connector (1) and remove the wiring harness from the brake caliper assembly (2).

Fig. 6: Parking Brake Actuator

Courtesy of GENERAL MOTORS COMPANY

11. Remove Bolt (2) @Parking Brake Actuator (1)

Fig. 7: Seal Ring And Rear Brake Caliper Courtesy of GENERAL MOTORS COMPANY

12. Remove Seal Ring (1) @Rear Brake Caliper (2) and DISCARD

Installation Procedure

Fig. 8: Seal Ring And Rear Brake Caliper Courtesy of GENERAL MOTORS COMPANY

NOTE: The seating faces between actuator and housing must be free of scratches and clean.

1. Install a NEW O-ring seal.(1)

Fig. 9: Parking Brake Actuator

Courtesy of GENERAL MOTORS COMPANY

CAUTION: Fastener Caution

2. Install Bolt (2) @Parking Brake Actuator (1) and tighten 12 N.m (106 lb in)

Fig. 10: Brake Caliper Assembly And Lectrical Connector Courtesy of GENERAL MOTORS COMPANY

3. Connect the electrical connector (1) and fix the wiring harness with 2 cable straps to the brake caliper assembly (2).

4. Remove the caps from the brake caliper opening and the brake hose.

Fig. 11: Brake Hose, Fitting Bolt And Sealing Washers Courtesy of GENERAL MOTORS COMPANY

5. Install NEW brake hose fitting gaskets. (3)

6. Install Brake Hose Fitting Bolt (1) @Rear Brake Caliper and tighten 40 N.m (30 lb ft)

7. Bleed the brake system. Hydraulic Brake System Bleeding

8. Install the rear tire and wheel assemblies. Tire and Wheel Removal and Installation .

9. Remove the support and lower the vehicle.

10. With the engine OFF, gradually apply the brake pedal to approximately 2/3 of its travel distance.

11. Slowly release the brake pedal.

12. Wait 15 seconds, then repeat step 10 and 11 until a firm brake pedal is obtained.

13. Park Brake Calibration

REAR PARKING BRAKE SERVICE MODE SELECTION

Rear Parking Brake Actuator Release - Service Mode

Prior to any rear disc brake or parking brake service, the parking brake actuator must be placed in Service Mode.

1. Install a scan tool to the vehicle.

2. Turn the ignition ON with the engine OFF.

3. On the scan tool menu, select Electronic Brake Control Module.

4. Select Control Functions.

NOTE: Do NOT apply any brake pedal pressure during this step.

5. Select Rear Brake Caliper Piston Retract.

6. After the repair is complete, calibrate the park brake. Park Brake Calibration

Rear Parking Brake Actuator Release - Manual Release

In the event the rear parking brake actuator fails or there is a loss of electrical power, the parking brake may be released manually.

1. Remove the rear parking brake actuator. Rear Parking Brake Actuator Replacement

2. Insert an appropriate hex tool past the splines of the parking brake actuator piston apply spindle in the brake caliper.

3. Rotate the parking brake actuator piston apply spindle clockwise to release the parking brake.

4. After the repair is complete, calibrate the park brake. Park Brake Calibration

DESCRIPTION AND OPERATION

ELECTRONIC PARKING BRAKE DESCRIPTION

Vehicles with the electric parking brake have a switch in the center console or on the dash, which takes the place of the manual parking brake system, the foot pedal and release handle. In case of insufficient electrical power, the electric parking brake cannot be applied or released.

Electronic Brake Control Module

The parking brake function is integrated into the Electronic Brake Control Module. The Electronic Brake Control Module contains the logic for applying and releasing the parking brake when commanded by the Park Brake Switch.

When the Park Brake Switch is pulled, a signal is sent to the Electronic Brake Control Module which will supply 12 V to the apply control circuits and ground to the release control circuits which will cause the left and right park brake actuators to activate causing the park brakes to engage. When the Park Brake Switch is pressed, a signal is sent to the Electronic Brake Control Module which will supply 12 V to the released control circuits and ground to the apply control circuits which will cause the left and right park brake actuators to activate causing the park brakes to release.

The Electronic Brake Control Module will diagnose the park brake motor circuits to verify that they are functioning properly. The park brake motor circuits are used to command actuator motor operation, which will apply and release the parking brake. These circuits are used to activate the actuator, which applies or releases pressure on the rear caliper pistons, ultimately applying and releasing the park brake.

The Park Brake Motor Position Sensor is an internal sensor to the park brake actuator, this sensor is used to monitor the park brake motor position.

Electric Parking Brake Apply

The electric parking brake can be applied any time the vehicle is stopped or in motion. The electric parking brake is applied by momentarily lifting up on the park brake control switch. The red park brake light will momentarily flash while the parking brake is being applied. Once fully applied, the red park brake light will turn on. If the electric parking brake is applied while the vehicle is in motion, a chime will sound, and the message "Release Park Brake Switch" will be displayed.

If the red park brake light is flashing, the electric parking brake is only partially applied or released, or there is a problem with the electric parking brake. The message "Service Park Brake" will be displayed.

The vehicle may automatically apply the electric parking brake in some situations when the vehicle is not moving. This is normal, and is done to periodically check the correct operation of the electric parking brake system.

Electric Parking Brake Release

To release the electric parking brake, turn the ignition switch to the ON or RUN position, apply and hold the brake pedal, and push down momentarily on the park brake control switch. When the electric parking brake is released the red park brake light turns off.

The electric parking brake can be used to prevent roll back for vehicles with a manual transmission taking off on a hill. In a situation where no roll back is desired, an applied electric parking brake will allow both feet to be used for the clutch and accelerator pedals in preparation for starting the vehicle moving in the intended direction. In this situation, perform the normal clutch and accelerator actions required to begin moving the vehicle. There is no need to push the switch to release the electric parking brake. To disable this feature lift and hold the park brake control switch while the vehicle is in motion, this will keep the electric parking brake applied.

PARK BRAKE SYSTEM DESCRIPTION AND OPERATION

Electronic Park Brake System

By pushing the parking brake switch, the actuators on each rear disc brake caliper will be activated and the rear brake caliper pistons apply pressure to the rear disc brake rotors until the rear tire and wheel assemblies are locked. A red brake lamp shows the status of the activated parking brake and is illuminating during the On position of the ignition switch.

By pressing the parking brake switch a second time, the electronic parking brake will release and the red brake lamp go out.

Non mechanical problems with the electronic parking brake system can be localized with a scan tool.

Service

Before a repair service procedure on the rear brakes is carried out, the electronic parking brake system has to be set in a service mode. After the repair service procedure of the rear disc brakes, the electronic parking brake system has to be calibrated before the vehicle can leave the workshop. The rotation of the rear brake caliper piston of a brake caliper equipped with an electronic parking brake system is not allowed. The rear brake caliper piston can be retracted by pressing in the caliper bore with a suitable tool.

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