Circuit/System Testing

2007 BRAKES Antilock Brake System - H3

1. Ignition OFF, disconnect the harness connector at the yaw rate/lateral and longitudinal accelerometer sensor.

2. Test for less than 1 ohm of resistance between the ground circuit terminal 4 and ground.

о If greater than the specified range, test for an open/high resistance in the ground circuit.

3. Ignition ON, verify that a test lamp illuminates between the ignition circuit terminal 1 and ground.

о If the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance.

4. Ignition OFF, disconnect the C2 harness connector at the EBCM.

5. Ignition ON, test for 0 volts between the CAN HI circuit terminal 11 and ground.

о If greater than the specified value, test the CAN HI circuit for a short to voltage.

6. Test for 0 volts between the CAN LO circuit terminal 25 and ground.

о If greater than the specified value, test the CAN LO circuit for a short to voltage.

7. Ignition OFF, test for infinite resistance between the CAN HI circuit terminal 11 and ground.

о If not the specified value, test the suspect circuit for a short to ground.

8. Test for infinite resistance between the CAN LO circuit terminal 25 and ground.

о If not the specified value, test the CAN LO circuit for a short to ground.

9. Test for less than 1 ohm of resistance between the CAN HI circuit terminal 11 and terminal

2.

о If greater than the specified range, test the CAN HI circuit for an open/high resistance.

10. Test for less than 1 ohm of resistance between the CAN LO circuit terminal 3 and terminal 25.

о If greater than the specified range, test the CAN LO circuit for an open/high resistance.

11. Test for infinite resistance between the CAN HI terminal 11 and the CAN LO terminal 25.

о If not the specified value, test the CAN HI and CAN LO circuits for a short together.

12. If all circuits test normal, replace the Yaw Rate/Lateral sensor.

Repair Procedures

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Vehicle Yaw Sensor with Vehicle Lateral and Longitudinal Accelerometer Replacement SYMPTOMS - ANTILOCK BRAKE SYSTEM

2007 BRAKES Antilock Brake System - H3

IMPORTANT: The following steps must be completed before using the symptom tables. 1. Perform the ABS Diagnostic System Check before using the symptom tables in order to verify that all of the following are true:

• There are no DTCs set.

• The control modules can communicate via the serial data link.

2. Review the system description and operation in order to familiarize yourself with the system functions. Refer to ABS Description and Operation.

Visual/Physical Inspection

• Inspect for aftermarket devices which could affect the operation of the ABS. Refer to Checking Aftermarket Accessories.

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

Intermittent

Faulty electrical connections or wiring may be the cause of intermittent conditions. Refer to Testing for Intermittent Conditions and Poor Connections.

Symptom List

Refer to a symptom diagnostic procedure from the following list in order to diagnose the symptom:

• ABS Indicator Always On

• ABS Indicator Inoperative

• Stability System Caution Indicator Always On

• Stability System Caution Indicator Inoperative

• Traction Off Indicator Always On

• Traction Off Indicator Inoperative

• Vehicle Stability Enhancement System Poor Performance

ABS INDICATOR ALWAYS ON

2007 BRAKES Antilock Brake System - H3

Diagnostic Fault Information

IMPORTANT: Always perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

Circuit/System Description

The instrument panel cluster (IPC) illuminates the Antilock Brake System (ABS) indicator by supplying ground to the lamp. The electronic brake control module (EBCM) sends a serial data messages to the IPC, in order to command the indicator ON or OFF.

Circuit/System Testing

Note: Diagnose all vehicle DTCs before using this diagnostic.

With the scan tool, select instrument panel special functions Lamp Test. Command the instrument panel warning lamps OFF.

• If the ABS warning lamp does not turn OFF, replace the IPC.

• If the ABS lamp turns off and there are no DTCs stored in any vehicle systems, replace the EBCM.

Repair Procedures

IMPORTANT: Always perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for EBCM or IPC replacement, setup and programming

ABS INDICATOR INOPERATIVE Diagnostic Fault Information

IMPORTANT: Always perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

Circuit/System Description

The instrument panel cluster (IPC) illuminates the Antilock Brake System (ABS) indicator by supplying ground to the lamp. The electronic brake control module (EBCM) sends a serial data messages to the IPC, in order to command the indicator ON or OFF.

2007 BRAKES Antilock Brake System - H3

Circuit/System Testing

Note: Diagnose all vehicle DTCs before using this diagnostic.

With the scan tool, select instrument panel special functions Lamp Test. Command the instrument panel warning lamps ON.

• If the ABS warning lamp does not turn on, replace the IPC.

Repair Procedures

IMPORTANT: Always perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for EBCM or IPC replacement, setup and programming

STABILITY SYSTEM CAUTION INDICATOR ALWAYS ON Diagnostic Fault Information

IMPORTANT: Always perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

Circuit/System Description

The instrument panel cluster (IPC) illuminates the stability system caution indicator by supplying ground to the lamp. The electronic brake control module (EBCM) sends a serial data messages to the IPC, in order to command the indicator ON or OFF.

Circuit/System Testing

Note: Diagnose all vehicle DTCs before using this diagnostic.

With the scan tool, select instrument panel special functions Lamp Test. Command the instrument panel warning lamps OFF.

• If the stability system caution indicator lamp does not turn off, replace the IPC.

• If the stability system caution indicator lamp turns off and there are no DTCs stored in any vehicle systems, replace the EBCM.

Repair Procedures

2007 BRAKES Antilock Brake System - H3

IMPORTANT: Always perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for EBCM and IPC replacement, setup and programming

STABILITY SYSTEM CAUTION INDICATOR INOPERATIVE Diagnostic Fault Information

IMPORTANT: Always perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

Circuit/System Description

The instrument panel cluster (IPC) illuminates the stability system caution indicator by supplying ground to the lamp. The electronic brake control module (EBCM) sends a serial data messages to the IPC, in order to command the indicator ON or OFF.

Circuit/System Testing

Note: Diagnose all vehicle DTCs before using this diagnostic.

With the scan tool, select instrument panel special functions Lamp Test. Command the instrument panel warning lamps ON.

• If the stability system caution indicator does not turn on, replace the IPC.

Repair Procedures

IMPORTANT: Always perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for EBCM and IPC replacement, setup and programming

TRACTION OFF INDICATOR ALWAYS ON Diagnostic Fault Information

IMPORTANT: Always perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

Circuit/System Description

2007 BRAKES Antilock Brake System - H3

The instrument panel cluster (IPC) illuminates the traction off indicator by supplying ground to the lamp. The electronic brake control module (EBCM) sends a serial data messages to the IPC, in order to command the indicator ON or OFF.

Circuit/System Testing

Note: Diagnose all vehicle DTCs before using this diagnostic.

With the scan tool, select instrument panel special functions Lamp Test. Command the instrument panel warning lamps OFF.

• If the traction off indicator does not turn off, replace the IPC.

• If the traction off indicator turns off and there are no DTCs stored in any vehicle systems, replace the EBCM.

Repair Procedures

IMPORTANT: Always perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for EBCM or IPC replacement, setup and programming

TRACTION OFF INDICATOR INOPERATIVE Diagnostic Fault Information

IMPORTANT: Always perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

Circuit/System Description

The instrument panel cluster (IPC) illuminates the traction off indicator by supplying ground to the lamp. The electronic brake control module (EBCM) sends a serial data messages to the IPC, in order to command the indicator ON or OFF.

Circuit/System Testing

Note: Diagnose all vehicle DTCs before using this diagnostic.

1. With the scan tool, select instrument panel special functions Lamp Test. Command the instrument panel warning lamps ON.

о If the ABS warning lamp does not turn on, replace the IPC.

2007 BRAKES Antilock Brake System - H3

2. Turn the ignition OFF. Disconnect the traction control switch harness connector. Turn the ignition ON. Touch and release a 3-amp fused jumper wire between ground and the Traction Control System (TCS) switch signal circuit.

о If the traction off indicator illuminates, replace the traction control switch.

3. Disconnect the body control module (BCM) harness connector. Touch and release a 3-amp fused jumper wire between ground and the TCS switch signal circuit at the BCM.

о If the traction off indicator illuminates, repair an open in the TCS switch signal circuit.

о If the traction off indicator does not illuminate replace the BCM.

Repair Procedures

IMPORTANT: Always perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for EBCM, IPC or BCM replacement, setup and programming VEHICLE STABILITY ENHANCEMENT SYSTEM POOR 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.

Circuit/System Description

Proper operation of the Vehicle Stability Enhancement System (VSES) is highly dependent on the ability to apply brake pressure to a selected wheel, through the brake pressure modulator valve (BPMV), as commanded by the electronic brake control module (EBCM). The EBCM may not be able to detect certain mechanical failures that may cause the VSES to perform poorly. This diagnostic procedure is designed to help diagnose concerns of poor vehicle stability that may occur without the presence of any DTCs, by verifying the following:

• The tires are the correct size, properly inflated and in acceptable condition.

• There are no mechanical problems in the steering system.

• There are no mechanical problems in the suspension system

• There are no mechanical problems in the base brake system

• There are no mechanical problems in the locking differential or transfer case.

• All of the VSES related hydraulic controls within the BPMV are functioning correctly.

2007 BRAKES Antilock Brake System - H3

Repair Procedures

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

• Symptoms - Antilock Brake System

• Symptoms - Hydraulic Brakes

• Symptoms - Locking/Limited Slip Rear Axle

• Symptoms - Steering Wheel and Column

• Symptoms - Suspension General Diagnosis

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