Hummer H3. Manual — part 635

Ignition voltage is greater than 9.5 volts.

Conditions for Setting the DTC

Stop switch is on and vehicle speed is greater than 15 km/h (9 mph) for 15 minutes continuously.

Action Taken When the DTC Sets

EBCM disables traction control system (TCS) and vehicle stability enhancement system
(VSES) for the duration of the ignition cycle.

Stability Caution indicator turns ON.

Driver information center (DIC) displays the TRACTION FAILED message.

An ECE 13 response occurs.

Conditions for Clearing the DTC

The condition for setting the DTC is no longer present and the DTC is cleared with a scan
tool.

The EBCM automatically clears the history DTC when a current DTC is not detected in 100
consecutive drive cycles.

Reference Information

Schematic Reference

Antilock Brake System Schematics

Connector End View Reference

Antilock Brake System Connector End Views

Electrical Information Reference

Circuit Testing

Connector Repairs

Testing for Intermittent Conditions and Poor Connections

Wiring Repairs

Scan Tool Reference

Scan Tool Data List

2007 Hummer H3

2007 BRAKES Antilock Brake System - H3

Circuit/System Verification

With the scan tool, observe the Brake Switch Status data parameter. Apply and release the brake
pedal. The brake pedal switch status should change from OFF to ON.

Circuit/System Testing

1. Release the brake pedal. With the scan tool observe the Brake Switch Status data

parameter.

If the fault is current, the scan tool brake switch status displays ON.

If the scan tool displays OFF, go to Testing for Intermittent Conditions and Poor
Connections .

2. With the ignition OFF, disconnect the EBCM connector. With the Ignition ON release the

brake pedal and connect a test lamp between the stop lamp switch signal circuit and ground.

If the test lamp illuminates go to Symptoms - Lighting Systems .

If the test lamp does not illuminate, replace the EBCM/brake pressure modulator valve
(BPMV) assembly.

Repair Procedures

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Symptoms - Lighting Systems

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

DTC C0179

DTC Descriptor

DTC C0179

System Thermal High

Diagnostic Fault Information

Circuit/System Description

The electronic brake control module (EBCM) monitors Traction Control System (TCS)

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

using this diagnostic procedure.

2007 Hummer H3

2007 BRAKES Antilock Brake System - H3

activation in order to calculate an estimate of the EBCM solenoid valve temperatures. In most
cases high solenoid valve temperatures are caused by extended TCS activation. If the EBCM
calculates that the solenoid valve temperatures are too high, the EBCM will temporarily suspend
the TCS function until the solenoid valves cool.

Conditions for Running the DTC

The ignition is ON.

Conditions for Setting the DTC

The estimated solenoid coil temperature reaches the temperature limit.

Action Taken When the DTC Sets

The EBCM disables the Antilock Brake System (ABS)/TCS/Vehicle Stability Enhancement
System (VSES) for the duration of the ignition cycle.

The ABS indicator turns ON.

The driver information center (DIC) displays the ABS system message.

The DIC displays the TRACTION FAILED system message.

Conditions for Clearing the DTC

After the solenoid valves have cooled the EBCM automatically re-enables TCS function.

The EBCM automatically clears the history DTC when a current DTC is not detected in 100
consecutive drive cycles.

Reference Information

Schematic Reference

Antilock Brake System Schematics

Connector End View Reference

Antilock Brake System Connector End Views

Electrical Information Reference

Circuit Testing

Connector Repairs

Testing for Intermittent Conditions and Poor Connections

2007 Hummer H3

2007 BRAKES Antilock Brake System - H3

Wiring Repairs

Scan Tool Reference

Scan Tool Data List

Circuit/System Verification

With the scan tool, observe the Brake Switch Status data parameter. Apply and release the brake
pedal. The brake pedal switch status should change from OFF to ON.

Circuit/System Testing

1. Most occurrences of this DTC are caused by excessive TCS activation or braking. Review

with the customer to verify the conditions under which the DTC set.

If vehicle operation caused this DTC to set, clear the DTC.

2. Test drive the vehicle under normal conditions

If the DTC resets under normal driving conditions, replace the EBCM/brake pressure
modulator valve (BPMV).

Repair Procedures

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

DTC C0186 OR C0196

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 Descriptor

DTC C0186

Lateral Accelerometer Circuit

DTC C0196

IMPORTANT: Always perform the Diagnostic Repair Verification after

completing the diagnostic procedure.

2007 Hummer H3

2007 BRAKES Antilock Brake System - H3