Hummer H3. Manual — part 1414

2

2. Place the headlamps in the AUTO

position.

Do the low beam headlamp bulbs
illuminate?

Go to Testing
for Intermittent
Conditions and
Poor
Connections

Go to Step 3

3

With a scan tool, observe the DRL Status
parameter in the body control module
(BCM) data list.
Does the scan tool display On?

Go to Step 4

Go to Step 7

4

Test the DRL supply voltage circuit for an
open, high resistance or short to ground.
Refer to Circuit Testing and Wiring
Repairs .
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 underhood fuse block.
Refer to Testing for Intermittent
Conditions and Poor Connections and
Connector Repairs .
Did you find and correct the condition?

Go to Step 9

Go to Step 6

6

Replace the DRL relay. Refer to Relay
Replacement (Attached to Wire
Harness) or Relay Replacement (Within
an Electrical Center) .
Did you complete the repair?

Go to Step 9

-

7

Inspect for poor connections at the harness
connector of the BCM. Refer to Testing
for Intermittent Conditions and Poor
Connections and Connector Repairs .
Did you find and correct the condition?

Go to Step 9

Go to Step 8

8

Replace the BCM. Refer to Control
Module References for replacement,
setup and programming.
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

2007 Hummer H3

2007 ACCESSORIES & EQUIPMENT Lighting - H3

DAYTIME RUNNING LAMPS (DRL) ON WITH PARK BRAKE APPLIED

Daytime Running Lamps (DRL) On with Park Brake Applied

Step

Action

Yes

No

Schematic Reference: Headlights/Daytime Running Lights (DRL) Schematics
Connector End View Reference: Lighting Systems Connector End Views, Data
Communication Connector End Views or Hydraulic Brake Connector End Views

1

Did you perform the Diagnostic System
Check - Vehicle?

Go to Step 2

Go to
Diagnostic
System Check -
Vehicle

2

Verify that the daytime running lamps
(DRL) headlamps are ON with the parking
brake applied.
Do the DRL headlamps operate normally
with the parking brake applied?

Go to Testing
for Intermittent
Conditions and
Poor
Connections

Go to Step 3

3

1. Set the park brake.

2. Turn ON the ignition, with the engine

OFF.

3. With the scan tool, read the park brake

switch status.

Does the scan tool display Applied?

Go to Step 6

Go to Step 4

4

1. Disconnect the park brake switch.

2. Connect a fused jumper wire between

the park brake switch signal circuit and
the ground circuit.

3. With the scan tool, read the park brake

switch status.

Does the scan tool display Applied?

Go to Step 7

Go to Step 5

5

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

Go to Step 10

Go to Step 6

Inspect for poor connections at the harness
connector of the body control module

2007 Hummer H3

2007 ACCESSORIES & EQUIPMENT Lighting - H3

FOG LAMP INDICATOR INOPERATIVE

Fog Lamp Indicator Inoperative

6

(BCM). Refer to Circuit Testing and
Wiring Repairs .
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 park brake switch. Refer to
Circuit Testing and Wiring Repairs .
Did you find and correct the condition?

Go to Step 10

Go to Step 9

8

Replace the BCM. Refer to Control
Module References for replacement, setup
and programming.
Did you complete the replacement?

Go to Step 10

-

9

Replace the park brake switch. Refer to
Parking Brake Indicator Switch
Replacement (LHD) or Parking Brake
Indicator Switch Replacement (RHD) .
Did you complete the replacement?

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: Fog Lights Schematics
Connector End View Reference: Lighting Systems Connector End Views

1

Did you perform the Diagnostic System
Check - Vehicle?

Go to Step 2

Go to
Diagnostic
System Check
- Vehicle

2

Verify that the fog lamp indicator is
inoperative.
Does the fog lamp indicator operate
normally?

Go to Testing
for
Intermittent
Conditions
and Poor
Connections

Go to Step 3

3

Do the fog lamps operate normally?

Go to
Symptoms -

2007 Hummer H3

2007 ACCESSORIES & EQUIPMENT Lighting - H3

FOG LAMPS ALWAYS ON

Fog Lamps Always On

Go to Step 4

Lighting
Systems

4

Test the fog lamp indicator control circuit for
a short to ground, open or high resistance.
Refer to Circuit Testing or Wiring
Repairs .
Did you find and correct the condition?

Go to Step 6

Go to Step 5

5

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

Go to Step 6

-

6

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: Fog Lights Schematics
Connector End View Reference: Lighting Systems Connector End Views or Data
Communication Connector End Views

1

Did you perform the Diagnostic System
Check - Vehicle?

Go to Step 2

Go to
Diagnostic
System Check -
Vehicle

2

Verify that the front fog lamps are always
ON.
Do the front fog lamps operate normally?

Go to Testing
for Intermittent
Conditions and
Poor
Connections

Go to Step 3

3

With a scan tool, observe the Front Fog
Lamp Switch data parameter in the body
control module (BCM) data list.
Does the scan tool display Inactive?

Go to Step 4

Go to Step 6

4

Remove the front fog lamp relay. Refer to
Relay Replacement (Attached to Wire
Harness) or Relay Replacement

2007 Hummer H3

2007 ACCESSORIES & EQUIPMENT Lighting - H3