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