Hummer H3. Manual — part 643

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

STABILITY SYSTEM CAUTION INDICATOR INOPERATIVE

Diagnostic Fault Information

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

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

TRACTION OFF INDICATOR ALWAYS ON

Diagnostic Fault Information

Circuit/System Description

IMPORTANT: Always perform the Diagnostic Repair Verification after

completing the diagnostic procedure.

IMPORTANT: Always perform the Diagnostic System Check - Vehicle prior to

using this diagnostic procedure.

IMPORTANT: Always perform the Diagnostic Repair Verification after

completing the diagnostic procedure.

IMPORTANT: Always perform the Diagnostic System Check - Vehicle prior to

using this diagnostic procedure.

2007 Hummer H3

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

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

TRACTION OFF INDICATOR INOPERATIVE

Diagnostic Fault Information

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.

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

IMPORTANT: Always perform the Diagnostic Repair Verification after

completing the diagnostic procedure.

IMPORTANT: Always perform the Diagnostic System Check - Vehicle prior to

using this diagnostic procedure.

2007 Hummer H3

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.

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.

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

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

Repair Procedures

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.

IMPORTANT: Always perform the Diagnostic Repair Verification after

completing the diagnostic procedure.

2007 Hummer H3

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

REPAIR INSTRUCTIONS

ANTILOCK BRAKE SYSTEM AUTOMATED BLEED PROCEDURE (WITHOUT RPO BRM)

CAUTION: Refer to Brake Fluid Irritant Caution .

CAUTION: Do not remove the reservoir cap while depressing and

releasing the brake pedal. If the cap is removed while
depressing and releasing the brake pedal, pressurized brake
fluid being returned to the reservoir may leave the reservoir.
Personal injury or vehicle damage could result.

NOTE:

Refer to Brake Fluid Effects on Paint and Electrical Components
Notice .

NOTE:

When adding fluid to the brake master cylinder reservoir, use only
Delco Supreme 11®, GM P/N 12377967 (Canadian P/N 992667) or
equivalent DOT-3 brake fluid from a clean, sealed brake fluid
container. The use of any type of fluid other than the recommended
type of brake fluid, may cause contamination which could result in
damage to the internal rubber seals and/or rubber linings of
hydraulic brake system components.

NOTE:

Do Not allow the HBCi pump and motor to run more than 1 minute
continuously. Allow 2 minutes cool down time between pump run
times. Extended pump and motor run time could create excessive
heat and damage the pump and motor assembly.

2007 Hummer H3

2007 BRAKES Antilock Brake System - H3