Hummer H3. Manual — part 640

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

DRP may be disabled and the Brake Warning indicator may turn ON.

Stability Caution indicator turns ON.

DIC displays the SERVICE STAB SYS message.

DIC displays the TRACTION FAILED message.

Conditions for Clearing the MIL/DTC

The condition for 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.

Circuit/System Verification

This DTC is for information only. As an aid to the technician, this DTC indicates that there are no
problems in the ABS/TCS system.

Repair Procedures

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for EBCM replacement, setup and programming

DTC C0276

DTC Descriptor

DTC C0276

Transmission Control Module (TCM) Traction Control Not Allowed

Diagnostic Fault Information

Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

Circuit/System Description

The electronic brake control module (EBCM) may inhibit the Traction Control System (TCS) if
a failure occurs with the locking differential or the transfer case.

Conditions for Running the DTC

2007 Hummer H3

2007 BRAKES Antilock Brake System - H3

The ignition is ON.

Conditions for Setting the DTC

The transfer case selected range has been reported as invalid by the transfer case control
module (TCCM).

The rear differential status has been reported as locked by the TCCM when the vehicle
speed is greater than 50 km/h (31 mph) for 10 seconds.

Action Taken When the DTC Sets

The EBCM disables the TCS and Vehicle Stability Enhancement System (VSES) for the
duration of the ignition cycle.

The driver information center (DIC) displays the SERVICE TRACTION message.

The DIC displays the SERVICE STAB SYS message.

Conditions for Clearing the DTC

The condition for the DTC is no longer present.

Using a scan tool, clear the DTC function.

Diagnostic Aids

Check the TCCM for DTCs.

DTC C0550

DTC Descriptor

DTC C0550

Electronic Control Unit (ECU) Performance

Diagnostic Fault Information

Circuit/System Description

The electronic brake control module (EBCM) detects an internal malfunction.

Conditions for Running the DTC

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

using this diagnostic procedure.

2007 Hummer H3

2007 BRAKES Antilock Brake System - H3

The ignition switch is in the ON position.

Conditions for Setting the DTC

An internal EBCM malfunction exists.

Action Taken When the DTC Sets

One or more of the following actions may occur:

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

The dynamic rear proportioning (DRP) may be disabled and the Brake Warning indicator
may turn ON.

The Stability Caution indicator turns ON.

The DIC displays the SERVICE STAB SYS message.

The DIC displays the TRACTION FAILED message.

Conditions for Clearing the MIL/DTC

The condition for 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.

Circuit/System Verification

DTC C0550 will set as result of internal EBCM circuit failure.

Replace the EBCM.

Repair Procedures

Control Module References - for EBCM replacement, setup and programming

DTC C0710

Diagnostic Instructions

Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

IMPORTANT: Always perform the Diagnostic Repair Verification after

completing the diagnostic procedure.

2007 Hummer H3

2007 BRAKES Antilock Brake System - H3

Review Strategy Based Diagnosis for an overview of the diagnostic approach.

Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC Descriptor

DTC C0710

Steering Position Signal

Circuit/System Description

The electronic brake control module (EBCM) receives a digital and an analog steering wheel
position signal from one sensor. The EBCM uses the steering wheel position sensor (SWPS)
signals to perform Vehicle Stability Enhancement System (VSES). The analog and digital data
parameters on the scan tool normally range from +220° to -220°. With the steering and steering
wheel centered, the analog data parameter on the scan tool should display near 0°. The digital
data parameter will calibrate to 0° after each key cycle regardless of actual steering wheel
position. The EBCM verifies the accuracy of the steering wheel position signal by correlating the
digital and analog signals together.

Conditions for Running the DTC

The ignition is ON.

Conditions for Setting the DTC

Vehicle speed is greater than 15 km/h (9 mph), the steering angle does not change more than
10 degrees in 20 seconds and the yaw rate is 8.6 degrees/sec or more.

The digital and analog steering wheel position signals do not correlate.

Action Taken When the DTC Sets

The EBCM disables the VSES for the duration of the ignition cycle.

Stability Caution indicator turns ON.

The driver information center (DIC) displays the SERVICE STAB SYS message.

Conditions for Clearing the DTC

The condition for 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.

2007 Hummer H3

2007 BRAKES Antilock Brake System - H3