Hummer H2. Manual - part 371

tachometer display?

Wiring Systems

Go to Step 3

3

1. Turn OFF the ignition.  

2. Disconnect the PCM connector C2.  

3. Install one J 33431-C lead to the engine 

speed signal circuit at the PCM harness 
connector, and connect the other lead to a 
good ground. See Special Tools and 
Equipment .  

4. Turn ON the ignition, with the engine OFF. 

5. Set the J 33431-C to generate a tachometer 

signal. See Special Tools and Equipment . 

Does the vehicle tachometer indicate an RPM 
reading?

Go to Step 5

Go to Step 4

4

Test the engine speed signal circuit for a short to 
voltage or for a short to ground. Refer to Circuit 
Testing and to Wiring Repairs in Wiring 
Systems. 
Did you find and correct the condition?

Go to Step 9

Go to Step 6

5

Inspect for poor connections at the PCM 
connector. Refer to Testing for Intermittent 
Conditions and Poor Connections and to 
Connector Repairs in Wiring Systems. 
Did you find and correct the condition?

Go to Step 9

Go to Step 7

6

Inspect for a poor connection at the harness 
connector of the IPC. Refer to Testing for 
Intermittent Conditions and Poor Connections 
and to Connector Repairs in Wiring Systems. 
Did you find and correct the condition?

Go to Step 9

Go to Step 8

7

Replace the PCM. Refer to Powertrain Control 
Module (PCM) Replacement in Engine 
Controls-6.0L (LG4).Did you complete the 
replacement?

IMPORTANT:

Program the replacement PCM.

Go to Step 9

-

8

Replace the IPC. Refer to Instrument Panel 
Cluster (IPC) Replacement . 
Did you complete the replacement?

Go to Step 9

-

9

1. Use the scan tool in order to clear the 

DTCs.  

2. Operate vehicle within the Conditions for 

Running this DTC.  

 

2004 Hummer H2 

2004 ACCESSORIES & EQUIPMENT Instrument Panel, Gauges, and Console - Hummer H2

  

SYMPTOMS - INSTRUMENT PANEL, GAUGES AND CONSOLE 

1. Perform Diagnostic System Check - Instrument Cluster , Diagnostic System Check - Driver 

Information Systems or Diagnostic System Check - Audible Warnings before using the Symptom 
Tables in order to verify that all of the following are true: 

z

There are no DTCs set.  

z

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: 

z

Instrument Panel Cluster (IPC) Description and Operation  

z

Indicator/Warning Message Description and Operation  

z

Driver Information Center (DIC) Description and Operation  

z

Audible Warnings Description and Operation  

Visual/Physical Inspection 

z

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

z

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

z

Inspect for proper fluid level.  

Intermittent 

Faulty electrical connections or wiring may be the cause of intermittent conditions. Refer to Testing for 
Intermittent Conditions and Poor Connections in Wiring Systems. 

Symptom List 

Refer to a symptom diagnostic procedure from the following list in order to diagnose the symptom: 

Gauges and Odometer 

z

Instrument Cluster Inoperative  

z

Engine Oil Pressure Gauge Inaccurate or Inoperative  

z

Fuel Gauge Inaccurate or Inoperative  

z

Instrument Panel Cluster (IPC) Gauges Inoperative  

z

Odometer Trip/Reset Switch Inoperative  

z

Speedometer and/or Odometer Inaccurate or Inoperative

Does the DTC reset?

Go to Step 2

System OK

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

 

2004 Hummer H2 

2004 ACCESSORIES & EQUIPMENT Instrument Panel, Gauges, and Console - Hummer H2

  

z

Tachometer Inaccurate or Inoperative  

z

Volt Gauge Inaccurate or Inoperative  

z

Change Engine Oil Indicator Always On  

z

Low Engine Oil Level Indicator Always On  

Indicators 

z

ABS Indicator Always On in Anti-lock Brake System  

z

ABS Indicator Inoperative in Anti-lock Brake System  

z

Air Bag Indicator Circuit Malfunction in SIR  

z

Brake Warning Indicator Always On in Hydraulic Brakes  

z

Brake Warning Indicator Inoperative in Hydraulic Brakes  

z

Change Engine Oil Indicator Always On  

z

Charge Indicator Always On in Engine Electrical  

z

Charge Indicator Inoperative in Engine Electrical  

z

Engine Coolant Temperature Indicator Always On in Engine Cooling  

z

Engine Overheated Indicator Always On in Engine Cooling  

z

High Beam Indicator Always On in Lighting Systems  

z

High Beam Indicator Inoperative in Lighting Systems  

z

Low Engine Oil Level Indicator Always On  

z

Low Washer Fluid Indicator Malfunction in Wipers/Washer Systems  

z

Malfunction Indicator Lamp (MIL) Inoperative in Engine Controls - 6.0L (LG4)  

z

Malfunction Indicator Lamp (MIL) Always On in Engine Controls - 6.0L (LG4)  

z

Security Indicator Always On or Flashing in Theft Deterrent  

z

Security Indicator Inoperative in Theft Deterrent  

z

Service Indicator Always On in Transfer Case BW 4484  

z

Service Indicator Inoperative in Transfer Case BW 4484  

z

Tow/Haul Switch/Indicator Always On or Inoperative in Automatic Transmission - 4L60E  

z

Traction Off Indicator Always On in Anti-lock Brake System  

z

Traction Off Indicator Inoperative in Anti-lock Brake System  

z

Turn Signal Lamps and/or Indicators Always On or Flashing in Lighting Systems  

z

Turn Signal Lamps and/or Indicators Inoperative in Lighting Systems  

Instrument Cluster Dimming 

z

Interior Backlighting Inoperative in Lighting Systems  

z

Interior Backlighting Does Not Dim in Lighting Systems  

Driver Information Center (DIC) 

 

2004 Hummer H2 

2004 ACCESSORIES & EQUIPMENT Instrument Panel, Gauges, and Console - Hummer H2

  

Driver Information Center (DIC) Switch(es) Inoperative

Audible Warnings 

z

Chime Always On  

z

Chime Inoperative  

INSTRUMENT CLUSTER INOPERATIVE 

Instrument Cluster Inoperative 

Step 

or

Action

Yes

No

Schematic Reference: Instrument Cluster Schematics 
Connector End View Reference: Instrument Panel, Gauges, and Console Connector End Views

1

Did you perform the Instrument Cluster 
Diagnostic System Check?

Go to Step 2

Go to Diagnostic 

System Check - 

Instrument Cluster

2

1. Turn the ignition ON, with the engine 

OFF.  

2. Observe the instrument cluster.  

Does the instrument cluster perform the displays 
test?

Go to Testing for 

Intermittent Conditions 

and Poor Connections in 

Wiring Systems

Go to Step 3

3

1. Turn the ignition OFF.  

2. Disconnect the IPC.  

3. Turn the ignition ON, with the engine 

OFF.  

4. Connect a test lamp between the ignition 1 

voltage circuit and a good ground.  

Does the test lamp illuminate?

Go to Step 4

Go to Step 7

4

Connect a test lamp between the ignition 1 
voltage circuit of the instrument cluster and the 
ground circuit of the instrument cluster. 
Does the test lamp illuminate?

Go to Step 5

Go to Step 6

5

Inspect for poor connections at the harness 
connector of the IPC. Refer to Testing for 
Intermittent Conditions and Poor Connections
and Connector Repairs in Wiring Systems. 
Did you find and correct the condition?

Go to Step 9

Go to Step 8

6

Repair the open or a high resistance in the ground 
circuit. Refer to Circuit Testing and Wiring 
Repairs in Wiring Systems. 
Did you complete the repair?

Go to Step 9

-

 

2004 Hummer H2 

2004 ACCESSORIES & EQUIPMENT Instrument Panel, Gauges, and Console - Hummer H2