Hummer H3. Manual — part 1359

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, raise the vehicles drive wheels.

2. Engine ON, transmission in drive, verify the scan tool Vehicle Speed Sensor parameter

matches the speedometer display.

If the Vehicle Speed Sensor parameter does not match the speedometer display,
replace the IPC.

3. Verify that the odometer is operating properly.

If the odometer is not operating properly, replace the IPC.

Repair Procedures

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for IPC replacement, setup and programming

TACHOMETER INACCURATE OR INOPERATIVE

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 instrument panel cluster (IPC) displays the engine speed based on the information from the
powertrain control module (PCM). The PCM converts the data from the engine speed sensor to a
2 pulses/engine revolution signal. The PCM sends the engine speed information via class 2 serial

2007 Hummer H3

2007 ACCESSORIES & EQUIPMENT Displays and Gages - H3

data circuit to the IPC in order to display the engine speed.

Reference Information

Schematic Reference

Instrument Cluster Schematics

Connector End View Reference

Displays and Gages 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

Ignition ON, perform the tachometer gage sweep test with the scan tool.

If the tachometer gage does not sweep from its low to high position, replace the IPC.

Repair Procedures

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for IPC replacement, setup and programming

REPAIR INSTRUCTIONS

AMBIENT AIR TEMPERATURE SENSOR REPLACEMENT

2007 Hummer H3

2007 ACCESSORIES & EQUIPMENT Displays and Gages - H3

Fig. 9: Ambient Air Temperature Sensor Replacement
Courtesy of GENERAL MOTORS CORP.

Ambient Air Temperature Sensor Replacement

INSTRUMENT CLUSTER REPLACEMENT (LEFT HAND DRIVE)

Callout

Component Name

Fastener Tightening Specifications: Refer to Fastener Tightening
Specifications.Preliminary Procedures: Remove the front grille. Refer to Grille
Replacement .

NOTE:

Refer to Fastener Notice .

1

Screw, Sensor Ambient Air Temperature

Tighten: 10 N.m (89 lb in)

2

Sensor, Ambient Air Temperature

2007 Hummer H3

2007 ACCESSORIES & EQUIPMENT Displays and Gages - H3

Fig. 10: Instrument Panel Cluster (IPC) Replacement
Courtesy of GENERAL MOTORS CORP.

Instrument Cluster Replacement (Left Hand Drive)

Callout

Component Name

Preliminary Procedure:
Remove the instrument panel cluster trim plate. Refer to Instrument Cluster Trim Panel
Replacement (Left Hand Drive) or Instrument Cluster Trim Panel Replacement
(Right Hand Drive) .

1

Instrument Panel Cluster Screw (Qty: 4)

Tighten: 2 N.m (18 lb in)

NOTE:

Refer to Fastener Notice .

2

Instrument Panel Cluster Assembly

Procedure

2007 Hummer H3

2007 ACCESSORIES & EQUIPMENT Displays and Gages - H3