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