Hummer H2. Manual — part 325

PARK, LICENSE, AND TAIL LAMPS INOPERATIVE

Park, License, and Tail Lamps Inoperative

12

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

Go to Step 13

-

13

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 park, license and tail lamps are
inoperative.
Do the park, license and tail lamps operate
normally?

Go to Testing for

Intermittent Conditions

and Poor Connections in

Wiring Systems

Go to Step 3

3

Are all park, license, and tail lamps inoperative?

Go to Step 6

Go to Step 4

4

Test the supply circuit of the inoperative lamp
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 15

Go to Step 5

5

Test the ground circuit of the inoperative lamp
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 15

Go to Step 11

6

1. Remove the park lamp relay.

2. Ensure that the headlamp switch is in the

ON position.

3. Test for a ground signal at the park lamp

relay control circuit terminal in the
underhood fuse block. Refer to Circuit
Testing in Wiring Systems.

Was a ground signal present?

Go to Step 12

Go to Step 7

7

Use the scan tool to check the body control
module (BCM) parklamp switch input data.
Does the scan tool indicate a park lamps ON
request signal?

Go to Step 10

Go to Step 8

2004 Hummer H2

2004 ACCESSORIES & EQUIPMENT Lighting Systems - Hummer H2

READING LAMP(S) INOPERATIVE

Reading Lamp(s) Inoperative

8

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

Go to Step 15

Go to Step 9

9

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 15

Go to Step 13

10

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

Go to Step 15

Go to Step 14

11

Replace the inoperative bulb.
Did you complete the replacement?

Go to Step 15

-

12

Replace the park lamp relay. Refer to Relay
Replacement (Within an Electrical Center)
Relay Replacement (Attached to Wire
Harness) in Wiring Systems.
Did you complete the repair?

Go to Step 15

-

13

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

Go to Step 15

-

14

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 15

-

15

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 SchematicsBody Control System 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 Diagnostic System
Check?

Go to Step 2

Go to Diagnostic

System Check -

Lighting Systems

Turn ON the reading lamps.

Go to Testing for

2004 Hummer H2

2004 ACCESSORIES & EQUIPMENT Lighting Systems - Hummer H2

STOP LAMPS ALWAYS ON

Stop Lamps Always On

2

Does the system operate normally?

Electrical Intermittents

in Wiring Systems

Go to Step 3

3

Are all of the reading, visor and I/P compartment
lamps inoperative?

Go to Step 4

Go to Step 6

4

Is the TBC 2C Fuse in the I/P fuse block open?

Go to Step 5

Go to Step 6

5

Test the battery positive voltage circuit of the BCM
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 12

Go to Step 9

6

Test the inadvertent power supply voltage circuit of
the reading lamp for a short to ground, 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 12

Go to Step 7

7

Test the ground circuit of the reading lamp 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 12

Go to Step 8

8

Inspect the inoperative bulb for an open filament.
Is the bulb OK.

Go to Step 7

Go to Step 6

9

Repair the inadvertent power supply voltage circuit
for a short to ground. Refer to Wiring Repairs in
Wiring Systems.
Did you complete the repair?

Go to Step 12

-

10

Replace the inoperative bulb. Refer to Reading
Lamp and Bulb Replace - Overhead Console .
Did you complete the replacement?

Go to Step 12

-

11

Replace the dome lamp. Refer to Dome Lamp
Replacement in Interior Trim.
Did you complete the replacement?

Go to Step 12

-

12

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 Diagnostic System
Check?

Go to Step 2

Go to Diagnostic

System Check -

Lighting Systems

Depress the brake pedal.
Does the system operate normally?

Go to Testing for

Electrical

2004 Hummer H2

2004 ACCESSORIES & EQUIPMENT Lighting Systems - Hummer H2

STOP LAMPS INOPERATIVE

Stop Lamps Inoperative

2

Intermittents in Wiring

Systems

Go to Step 3

3

Disconnect the stop lamp switch.
Do the brake lamps go out?

Go to Step 6

Go to Step 4

4

Remove the CHMSL fuse.
Do the brake lamps go out?

Go to Step 7

Go to Step 5

5

Remove the STOP fuse.
Do the brake lamps go out?

Go to Step 8

Go to Step 9

6

Inspect for poor connections at the harness
connector of the 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 11

Go to Step 10

7

Repair the short to voltage in the CHMSL supply
voltage circuit. Refer to Wiring Repairs in Wiring
Systems.
Did you complete the repair?

Go to Step 11

-

8

Repair the short to voltage in the stop lamp switch
signal circuit. Refer to Wiring Repairs in Wiring
Systems.
Did you complete the repair?

Go to Step 11

-

9

Repair the short to voltage in the stop lamp supply
voltage circuit. Refer to Wiring Repairs in Wiring
Systems.
Did you complete the repair?

Go to Step 11

-

10

Replace the stop lamp switch. Refer to Stop Lamp
Switch Replacement .
Did you complete the replacement?

Go to Step 11

-

11

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 Diagnostic System
Check?

Go to Step 2

Go to Diagnostic

System Check -

Lighting Systems

2

Observe the stop lamps while pressing the brake
pedal.
Does the system operate normally?

Go to Testing for

Electrical

Intermittents in

Wiring Systems

Go to Step 3

2004 Hummer H2

2004 ACCESSORIES & EQUIPMENT Lighting Systems - Hummer H2