Hummer H3. Manual — part 1355

Testing for Intermittent Conditions and Poor Connections

Wiring Repairs

Scan Tool Reference

Scan Tool Data List

Circuit/System Testing

1. Ignition ON, headlamp switch OFF, verify the scan tool Headlamp Switch ON parameter is

Inactive.

If not Inactive, test the headlamps signal circuit for an open or short to voltage. If the
circuit tests normal, replace the headlamp switch.

2. Ignition ON, park lamp switch OFF, verify the scan tool Park Lamp Switch parameter is

Off.

If not Off, test the park lamp switch signal circuit for an open or short to voltage. If the
circuit tests normal, replace the headlamp switch.

3. Ignition OFF, key out of the ignition, verify the scan tool Ign. Off/Run/Crank parameter is

Inactive.

If not Inactive, test the key in ignition signal circuit for a short to ground. If the circuit
tests normal, replace the ignition switch.

4. Ignition ON, doors closed, verify the scan tool Door Ajar Switch parameters show Door

Closed.

If not Door Closed, go to Courtesy Lamps Always On .

5. If all circuits test normal, replace the BCM.

Repair Procedures

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Ignition and Start Switch Replacement

Headlamp Switch Replacement

Control Module References for BCM replacement, setup and programming

CHIME INOPERATIVE

Diagnostic Instructions

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

2007 Hummer H3

2007 ACCESSORIES & EQUIPMENT Displays and Gages - H3

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

Diagnostic Procedure Instructions provides an overview of each diagnostic category.

Circuit/System Description

The radio generates the audible warning through the left front speaker. The radio receives audible
warning requests via class 2 serial data from the body control module (BCM).

Reference Information

Schematic Reference

Instrument Cluster Schematics

Radio/Navigation System Schematics

Connector End View Reference

Displays and Gages Connector End Views

Entertainment/Communication 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

Circuit/System Testing

1. Ignition OFF, key in the ignition, open the driver door. The courtesy lamps should

illuminate

If the courtesy lamps do not illuminate, go to Courtesy Lamps Inoperative .

2. Ignition ON, radio ON, adjust the radio balance and fade to the left front speaker.

If the speaker does not operate properly, go to Speakers Inoperative - One or
More .

2007 Hummer H3

2007 ACCESSORIES & EQUIPMENT Displays and Gages - H3

3. If the speaker operates properly, replace the radio.

Repair Procedures

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for the Radio replacement, setup and programming

DOOR AJAR INDICATOR MALFUNCTION

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

The body control module (BCM) receives an input from all four door ajar switches, drivers,
passengers, left rear and right rear. The door ajar switches are normally open when the doors are
fully closed. When a door is opened, the door ajar switch contacts close providing a path to
ground. The driver information center (DIC) on the instrument panel cluster (IPC), illuminates
the door ajar message when the one of the doors is open. The IPC receives a serial data message
from the BCM, indicating the door ajar status. If this message is displayed and the vehicle speed
is greater than 8.1 km/h (5 mph), a chime will sound.

Reference Information

Schematic Reference

Instrument Cluster Schematics

Door Lock/Indicator Schematics

Connector End View Reference

Displays and Gages Connector End Views

Vehicle Access Connector End Views

Electrical Information Reference

Circuit Testing

2007 Hummer H3

2007 ACCESSORIES & EQUIPMENT Displays and Gages - H3

Connector Repairs

Testing for Intermittent Conditions and Poor Connections

Wiring Repairs

Scan Tool Reference

Scan Tool Data List

Circuit/System Testing

1. Ignition OFF, disconnect the harness connectors at the four door ajar switch assemblies.

2. Ignition OFF, test for less than 1.0 ohm of resistance between each of the four ground

circuits and ground.

If any of the ground circuits are greater than 1.0 ohm, test that ground circuit for an
open/high resistance.

3. Verify all the scan tool Door Ajar Switch parameters show Door Closed.

If not Door Closed, test the appropriate signal circuit for a short to ground. If the
circuits test normal, replace the BCM.

4. Install a 3-amp fused jumper one at a time between the four signal circuits and ground.

Verify that each scan tool Door Ajar Switch parameter is Door Ajar when each signal
circuit is jumpered.

If not Door Ajar, test the appropriate signal circuit for a short to voltage or an
open/high resistance. If all circuits test normal, replace the BCM.

5. Ignition OFF, reconnect the harness connectors at the four door ajar switch assemblies, one

at a time. Open and close the door with the reconnected harness. Verify that each scan tool
Door Ajar Switch parameter is Door Ajar when the door is open and Door Closed when the
door is closed.

If not Door Ajar when open or Door Closed when closed, replace the appropriate
door ajar switch assembly.

6. If all circuits test normal, test or replace the IPC.

Repair Procedures

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

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

ENGINE COOLANT TEMPERATURE GAGE INACCURATE OR INOPERATIVE

2007 Hummer H3

2007 ACCESSORIES & EQUIPMENT Displays and Gages - H3