Hummer H3. Manual — part 642

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.

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.

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.

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.

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.

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.

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.

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.

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.

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 Hummer H3

2007 BRAKES Antilock Brake System - H3

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

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.

2007 Hummer H3

2007 BRAKES Antilock Brake System - H3

Diagnostic Fault Information

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

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

ABS INDICATOR INOPERATIVE

Diagnostic Fault Information

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.

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

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

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

STABILITY SYSTEM CAUTION INDICATOR ALWAYS ON

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 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

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