Hummer H2. Manual - part 317

 

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Hummer H2. Manual - part 317

 

 

BACKUP LAMPS INOPERATIVE 

Backup Lamps Inoperative 

4

the backup lamps for a short to voltage. Refer 
to Circuit Testing and Wiring Repairs in 
Wiring Systems. 
Did you find and correct the condition?

Go to Step 7

Go to Step 5

5

Inspect for poor connections at the harness 
connector of the Body Control Module 
(BCM). 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 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 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: Exterior Lights 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 backup lamps are inoperative. 
Do the backup lamps operate normally?

Go to Testing for 

Intermittent Conditions 

and Poor Connections in 

Wiring Systems

Go to Step 3

3

Is only one backup lamp inoperative?

Go to Step 5

Go to Step 4

4

Use the scan tool to check if there are any codes 
set in the current or history Powertrain DTC 
Information. 
Are any codes present?

Go to the Diagnostic System 

Check in the appropriate 

Transmission Section

Go to Step 6

5

Test the backup lamp supply voltage and ground 
circuit for an open or high resistance. Refer to 
Circuit Testing and Wiring Repairs in Wiring 
Systems. 
Did you find and correct a condition?

Go to Step 10

Go to Step 8

Test the backup lamp supply voltage and ground 

 

2004 Hummer H2 

2004 ACCESSORIES & EQUIPMENT Lighting Systems - Hummer H2

  

CLEARANCE LAMPS INOPERATIVE 

Clearance Lamps Inoperative 

6

circuit for an open or high resistance or a short 
to ground. 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

7

Inspect for poor connections at the harness 
connector of the body control module (BCM). 
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 affected backup lamp bulb. Refer to 
Tail/Turn Signal Lamp Replacement (SUV) .
Did you complete the replacement?

Go to Step 10

-

9

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 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: Exterior Lights 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

Turn ON the park lamps. 
Do the clearance lamps illuminate?

Go to Testing for 

Intermittent Conditions 

and Poor Connections in 

Wiring Systems

Go to Step 3

3

Are the park lamps illuminated?

Go to Step 4

Go to Park, 

License, and Tail 

Lamps Inoperative

4

Are all clearance lamps inoperative?

Go to Step 7

Go to Step 5

5

Test the clearance lamp supply voltage and 
ground circuit for an open or high resistance. 
Refer to Circuit Testing and Wiring Repairs in 
Wiring Systems. 
Did you find and correct the condition?

Go to Step 9

Go to Step 6

Inspect for poor connections at the harness 

 

2004 Hummer H2 

2004 ACCESSORIES & EQUIPMENT Lighting Systems - Hummer H2

  

COURTESY LAMPS ALWAYS ON 

Courtesy Lamps Always On 

6

connector of the clearance lamp. Refer to Circuit 
Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?

Go to Step 9

Go to Step 8

7

Repair the interior park lamps supply voltage 
circuit of the clearance lamps for a short to 
ground, a high resistance, or an open. Refer to 
Circuit Testing and Wiring Repairs in Wiring 
Systems. 
Did you complete the repair?

Go to Step 9

-

8

Replace the affected clearance lamp bulb. 
Did you complete the replacement?

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

Schematic Reference: Interior Lights Schematics 
Connector End View Reference: Lighting Systems Connector End Views , Body Control System 
Connector End Views or Master Electrical Component List

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 courtesy/dome lamps are always ON. 
Do the courtesy/dome lamps operate normally?

Go to Testing for 

Intermittent 

Conditions and Poor 

Connections in Wiring 

Systems

Go to Step 3

3

Test for a ground signal on the liftgate ajar signal 
circuit of the liftgate ajar switch. 
Was a ground signal present?

Go to Step 5

Go to Step 4

4

1. Ensure that the instrument panel lamp dimmer 

switch is in the minimum brightness position.  

2. Inspect for the following related body control 

module (BCM), driver door module (DDM), and 
passenger door module (PDM) data parameters. 
Refer to Scan Tool Data List and Scan Tool 
Data Definitions for typical values and 
definitions: 

z

The courtesy lamp switch  

z

The interior lamp defeat switch  

z

The door ajar switches  

 

2004 Hummer H2 

2004 ACCESSORIES & EQUIPMENT Lighting Systems - Hummer H2

  

Was a problem found?

Go to Step 5

Go to Step 9

5

Disconnect and test the switch of the affected input 
circuit for proper continuity in the open and closed 
positions. Refer to Testing for Continuity in Wiring 
Systems. 
Is continuity correct in both positions?

Go to Step 6

Go to Step 7

6

Test the signal circuits of the affected input switch for a 
short to ground. Refer to Circuit Testing and Wiring 
Repairs in Wiring Systems. 
Did you find and correct the condition?

Go to Step 13

Go to Step 8

7

Inspect for poor connections at the harness connector of 
the affected 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 13

Go to Step 10

8

Inspect for poor connections at the harness connector of 
the module in the affected circuit. 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 13

Go to Step 11

9

Inspect for poor connections at the harness connector of 
the 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 13

Go to Step 12

10

Replace the switch in the affected circuit. 
Did you complete the replacement?

Go to Step 13

-

11

Replace the module in the affected circuit. Refer to the 
appropriate replacement procedure: 

z

Body Control Module Replacement in Body 
Control System  

z

Switch Replacement - Door Lock and Side 
Window - Driver in Doors  

z

Switch Replacement - Door Lock and Side 
Window - Passenger in Doors  

Did you complete the replacement?

IMPORTANT:

Perform the setup procedure for the replacement 
module as applicable.

Go to Step 13

-

IMPORTANT:

Perform the setup procedure for the BCM.

 

2004 Hummer H2 

2004 ACCESSORIES & EQUIPMENT Lighting Systems - Hummer H2

  

 

 

 

 

 

 

 

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