Hummer H2. Manual - part 322

 

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Hummer H2. Manual - part 322

 

 

HIGH BEAM INDICATOR ALWAYS ON 

High Beam Indicator Always On 

Do the high beam headlamps illuminate 
momentarily?

and Poor Connections in 

Wiring Systems

Go to Step 3

3

1. Place the headlamp switch in the ON 

position.  

2. Connect a fused jumper from ground to the 

headlamp switch flash to pass signal circuit 
terminal of the headlamp dimmer switch 
connector.  

Do the high beam headlamps illuminate?

Go to Step 6

Go to Step 4

4

Test the headlamp switch flash to pass signal circuit 
for high resistance or an open. Refer to Circuit 
Testing and Wiring Repairs in Wiring Systems. 
Did you find and correct the condition?

Go to Step 9

Go to Step 5

5

Inspect for poor connections at the harness 
connector of the body control module (BCM). 
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 7

6

Inspect for poor connections at the harness 
connector of the dimmer switch. 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

7

Replace the BCM. Refer to Body Control Module 
Replacement in Body Control System.Did you 
complete the replacement?

IMPORTANT:

Perform the setup procedure for the BCM.

Go to Step 9

-

8

Replace the headlamp dimmer switch. Refer to 
Multifunction, Turn Signal Switch Replacement 
in Steering Wheel and Column. 
Did you complete the repair?

Go to Step 9

-

9

Operate the system in order to verify the repair. 
Did you correct the condition?

System OK

Go to Step 3

Step

Action

Yes

No

Did you perform the Lighting Systems 

Go to Diagnostic 

 

2004 Hummer H2 

2004 ACCESSORIES & EQUIPMENT Lighting Systems - Hummer H2

  

HIGH BEAM INDICATOR INOPERATIVE 

High Beam Indicator Inoperative 

1

Diagnostic System Check?

Go to Step 2

System Check - 

Lighting Systems

2

1. Turn the ignition switch to the RUN 

position.  

2. Turn the headlamp switch to the ON 

position.  

3. Place the multifunction headlamp dimmer 

switch to the low beams position.  

Does the high beam indicator turn OFF as 
expected?

Go to Testing for 

Intermittent Conditions 

and Poor Connections in 

Wiring Systems

Go to Step 3

3

Do the high beam headlamps turn OFF as 
expected?

Go to Step 4

Go to Symptoms - 

Lighting Systems

4

Using a scan tool, select IPC, Special Functions, 
and command the Lamp Test ON, then OFF. 
Does the high beam indicator lamp turn ON and 
OFF when commanded?

Go to Testing for 

Intermittent Conditions 

and Poor Connections in 

Wiring Systems

Go to Step 5

5

Inspect for poor connections at the harness 
connector of the instrument panel cluster (IPC). 
Refer to Circuit Testing and Wiring Repairs in 
Wiring Systems. 
Did you find and correct the condition?

Go to Step 7

Go to Step 6

6

Replace the IPC. Refer to Instrument Panel 
Cluster (IPC) Replacement in Instrument 
Panel, Gauges, and Console.Did you complete 
the replacement?

IMPORTANT:

Perform the setup procedure for the IPC.

Go to Step 7

-

7

Operate the system in order to verify the repair.
Did you correct the condition?

System OK

Go to Step 3

Step

Action

Yes

No

1

Did you perform the Lighting Systems 
Diagnostic System Check?

Go to Step 2

Go to Diagnostic 

System Check - 

Lighting Systems

2

1. Turn the ignition switch to the RUN 

position.  

2. Turn the headlamp switch to the ON 

position.  

 

2004 Hummer H2 

2004 ACCESSORIES & EQUIPMENT Lighting Systems - Hummer H2

  

INTERIOR BACKLIGHTING DOES NOT DIM 

Interior Backlighting Does Not Dim 

3. Place the multifunction headlamp dimmer 

switch to the high beams position.  

Do the high beam indicator function properly?

Go to Testing for 

Intermittent Conditions 

and Poor Connections in 

Wiring Systems

Go to Step 3

3

Do the high beam headlamps function properly?

Go to Step 4

Go to Symptoms - 

Lighting Systems

4

Using a scan tool, select IPC, Special Functions, 
and command the Lamp Test ON, then OFF. 
Does the high beam indicator lamp turn ON and 
OFF when commanded?

Go to Testing for 

Intermittent Conditions 

and Poor Connections in 

Wiring Systems

Go to Step 5

5

Inspect for poor connections at the harness 
connector of the instrument panel cluster (IPC). 
Refer to Circuit Testing andWiring Repairs in 
Wiring Systems. 
Did you find and correct the condition?

Go to Step 7

Go to Step 6

6

Replace the IPC. Refer to Instrument Panel 
Cluster (IPC) Replacement in Instrument 
Panel, Gauges, and Console.Did you complete 
the replacement?

IMPORTANT:

Perform the setup procedure for the IPC.

Go to Step 7

-

7

Operate the system in order to verify the repair.
Did you correct the condition?

System OK

Go to Step 3

Step

Action

Yes

No

Schematic Reference: Interior Lights Dimming Schematics 
Connector End View Reference: Lighting Systems Connector End Views or Body Control System 
Connector End Views in Body Control System.

1

Did you perform the Lighting Systems 
Diagnostic System Check?

Go to Step 2

Go to Diagnostic 

System Check - 

Lighting Systems

2

Verify that the interior backlighting does not 
dim. 
Does the interior backlighting operate 
normally?

Go to Testing for 

Intermittent Conditions and 

Poor Connections in Wiring 

Systems

Go to Step 3

3

Use the scan tool output controls to operate 
the interior backlighting. 
Can you control the dimming level of an 
activated control switch indicator with the 
scan tool?

Go to Step 4

Go to Step 5

 

2004 Hummer H2 

2004 ACCESSORIES & EQUIPMENT Lighting Systems - Hummer H2

  

INTERIOR BACKLIGHTING INOPERATIVE 

Interior Backlighting Inoperative 

4

Test for an open, high resistance or short to 
ground in the following circuits. Refer to 
Circuit Testing and Wiring Repairs in 
Wiring Systems. 

z

The 5 volt reference  

z

The dimming input  

z

The dimming return  

 
Did you find and correct a condition?

Go to Step 10

Go to Step 6

5

Test for a short to voltage in the LED 
dimming circuit. Refer to Circuit Testing and 
Wiring Repairs in Wiring Systems. 
Did you find and correct a condition?

Go to Step 10

Go to Step 7

6

Inspect for poor connections at the harness 
connector of the headlamp switch. Refer to 
Circuit Testing and Wiring Repairs in 
Wiring Systems. 
Did you find and correct the condition?

Go to Step 10

Go to Step 8

7

Inspect for poor connections at the harness 
connector of the body control module. Refer 
to Circuit Testing and Wiring Repairs in 
Wiring Systems. 
Did you find and correct the condition?

Go to Step 10

Go to Step 9

8

Replace the headlamp switch. Refer to 
Headlamp Switch Replacement . 
Did you complete the replacement?

Go to Step 10

-

9

Replace the body control module (BCM). 
Refer to Body Control Module Replacement
in Body Control System.Did you complete the 
replacement?

IMPORTANT:

Perform the setup procedure for the BCM.

Go to Step 10

-

10

Operate the system in order to verify the 
repair. 
Did you correct the condition?

System OK

Go to Step 3

Step

Action

Yes

No

Schematic Reference: Interior Lights Dimming Schematics or Body Control System Schematics 
Connector End View Reference: Lighting Systems Connector End Views or Body Control System 

 

2004 Hummer H2 

2004 ACCESSORIES & EQUIPMENT Lighting Systems - Hummer H2

  

 

 

 

 

 

 

 

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