Hummer H3. Manual — part 654

ON and OFF to verify proper operation and the EBCM verifies the ability to return the system to
base braking in the event of a failure. The power-up self-test may sometimes be heard by the
driver or passengers of the vehicle.

ECE 13 Response

The ABS indicator illuminates when a malfunction which disables ABS is detected. Often, the
ABS indicator turns OFF following the instrument panel cluster (IPC) bulb check during the next
ignition cycle unless the fault is detected during that ignition cycle. However, the setting of
certain DTCs may cause the ABS indicator to remain illuminated during the subsequent ignition
cycle until the vehicle is operated at a speed greater than 10 km/h (7 mph) and no fault is
detected. This is referred to as an ECE 13 response. It is important to verify that ECE 13 is not
the cause of an ABS indicator which is illuminated when no DTCs are set, before attempting to
diagnose other possible causes.

Driver Information Indicators and Messages

The following indicators are used to inform the driver of several different conditions:

Brake Warning Indicator

The instrument panel cluster (IPC) illuminates the brake warning indicator when any of the
following instances occur.

Body control module (BCM) detects that the park brake is engaged. The BCM sends a
serial data message to the IPC requesting illumination.

EBCM detects a low brake fluid condition. The EBCM sends a serial data message to the
IPC requesting illumination.

IPC performs the bulb check.

IPC detects a loss of serial data communication with the EBCM.

EBCM detects an ABS-disabling malfunction which also disables dynamic rear
proportioning (DRP). The EBCM sends a serial data message to the IPC requesting
illumination.

EBCM detects the loss of the brake assist function.

ABS Indicator

The IPC illuminates the ABS indicator when any of the following instances occur.

The EBCM detects an ABS-disabling malfunction. The EBCM sends a serial data message
to the IPC requesting illumination.

2007 Hummer H3

2007 BRAKES Antilock Brake System - H3

The IPC performs the bulb check.

The IPC detects a loss of serial data communication with the EBCM.

An ECE 13 response occurs at the beginning of an ignition cycle. The EBCM sends a serial
data message to the IPC requesting illumination.

Stability Caution Indicator

The stability caution indicator flashes when the VSES is active and illuminates solid when there
is a TCS or VSES fault.

ABS Fault Message

The IPC displays the message whenever the ABS indicator is illuminated due to an ABS fault.

BRAKE SYSTEM Fault Message

The IPC displays the message whenever the red brake warning indicator is illuminated due to a
base brake or DRP fault.

BRAKE FLUID Fault Message

The IPC displays the message when the EBCM sets a C0267 for low brake fluid level.

SERVICE STAB SYS fault Message

The IPC displays the traction fault message when either of the following instances occur:

The EBCM detects a malfunction that requires VSES to be disabled. The EBCM sends a
serial data message to the IPC requesting that the message be displayed.

The IPC detects a loss of serial data communication with the EBCM.

SERVICE TRACTION fault Message

The IPC displays the traction fault message when either of the following instances occur:

The EBCM detects a malfunction that requires traction control to be disabled. The EBCM
sends a serial data message to the IPC requesting that the message be displayed.

The IPC detects a loss of serial data communication with the EBCM.

SPECIAL TOOLS AND EQUIPMENT

SPECIAL TOOLS

2007 Hummer H3

2007 BRAKES Antilock Brake System - H3

Special Tools

Illustration

Tool Number/Description

CH 47830

Holding Fixture

2007 Hummer H3

2007 BRAKES Antilock Brake System - H3

2006 Hummer H3

2006 SYSTEM WIRING DIAGRAMS Hummer - H3