Hummer H3. Manual — part 1354

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, disconnect the EOP switch.

2. Ignition OFF, test for less than 1 ohm of resistance between the low reference circuit and

ground.

If greater than 1 ohm, test the low reference circuit for an open/high resistance. If the
circuit tests normal, replace the PCM.

3. Ignition ON, install a 3-amp fused jumper wire between the signal circuit and the low

reference circuit. Verify the scan tool Engine Oil Pressure Switch parameter is Low.

If not Low, test the signal circuit of the EOP switch for an open/high resistance. If the
circuit tests normal replace the PCM.

4. If all circuits test normal, test or replace the EOP switch.

Repair Procedures

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Engine Oil Pressure Sensor and/or Switch Replacement

Control Module References for the PCM replacement, setup and programming

SYMPTOMS - DISPLAYS AND GAGES

1. Perform the Diagnostic System Check - Vehicle before using the Symptom Tables in

order to verify that all of the following are true:

There are no DTCs set.

IMPORTANT: The following steps must be completed before using the symptom

tables.

2007 Hummer H3

2007 ACCESSORIES & EQUIPMENT Displays and Gages - H3

The control modules can communicate via the serial data link.

2. Review the system operation in order to familiarize yourself with the system functions.

Refer to the following:

Instrument Cluster Description and Operation

Indicator/Warning Message Description and Operation

Driver Information Center (DIC) Description and Operation

Audible Warnings Description and Operation

Door Ajar Indicator Description and Operation

Compass Calibration and Magnetic Variance

Visual/Physical Inspection

Inspect for aftermarket devices which could affect the operation of the Instrument Cluster or
Audible Warning Systems. Refer to Checking Aftermarket Accessories .

Inspect the easily accessible or visible system components for obvious damage or conditions
which could cause the symptom.

Inspect the applicable reservoir for the proper fluid level related to the indicator or
message.

Verify that the indicators work properly during the displays test.

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:

Gages

Engine Coolant Temperature Gage Inaccurate or Inoperative

Fuel Gage Inaccurate or Inoperative

Speedometer and/or Odometer Inaccurate or Inoperative

Tachometer Inaccurate or Inoperative

Indicators

2007 Hummer H3

2007 ACCESSORIES & EQUIPMENT Displays and Gages - H3

ABS Indicator Always On

ABS Indicator Inoperative

Air Bag Indicator Circuit Malfunction

Brake Warning Indicator Malfunction

Charge Indicator Always On

Charge Indicator Inoperative

Door Ajar Indicator Malfunction

Engine Oil Pressure Indicator Always On

Engine Overheated Indicator Always On

Fog Lamp Indicator Inoperative

High Beam Indicator Always On

High Beam Indicator Inoperative

Malfunction Indicator Lamp (MIL) Always On for the 3.7L engine

Malfunction Indicator Lamp (MIL) Inoperative for the 3.7L engine

Mirror Compass Display Inoperative or Inaccurate

Mirrors - Temperature Display Inaccurate

Mirrors - Temperature Displays SC or OC

Passenger Presence System Indicator Circuit Malfunction

Security Indicator Malfunction

Seat Belt Indicator Circuit Malfunction - Driver

Seat Belt Indicator Circuit Malfunction - Passenger

Service Indicator Always On

Service Indicator Inoperative

Traction Off Indicator Inoperative

Transfer Case Shift Control Switch Indicator Always On - Two or More

Transfer Case Shift Control Switch Indicator Flashes, then Returns to Previous
Mode

Transfer Case Shift Control Switch Indicator Inoperative - One or More

Turn Signal Lamps and/or Indicators Always On or Flashing

Turn Signal Lamps and/or Indicators Inoperative

Instrument Cluster Dimming

2007 Hummer H3

2007 ACCESSORIES & EQUIPMENT Displays and Gages - H3

Interior Backlighting Does Not Dim

Interior Backlighting Inoperative

Odometer

Odometer Trip/Reset Switch Inoperative

Audible Warning

Chime Always On

Chime Inoperative

CHIME ALWAYS ON

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

Reference Information

Schematic Reference

Instrument Cluster Schematics

Body Control System Schematics

Connector End View Reference

Displays and Gages Connector End Views

Data Communication Connector End Views

Electrical Information Reference

Circuit Testing

Connector Repairs

2007 Hummer H3

2007 ACCESSORIES & EQUIPMENT Displays and Gages - H3