Hummer H3. Manual — part 1413

Step

Action

Yes

No

Schematic Reference: Interior Lights Schematics
Connector End View Reference: Lighting Systems Connector End Views, Data
Communication Connector End Views or Vehicle Access 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 courtesy lamps are
inoperative.
Do the courtesy lamps operate normally?

Go to Testing
for Intermittent
Conditions and
Poor
Connections

Go to Step 3

3

Inspect for the following related body
control module (BCM) module data
parameters. Refer to Scan Tool Data List
and

Scan Tool Data Definitions

for

typical values and definitions:

The courtesy lamp switch

The dome lamp override switch

The driver door ajar switch

The passenger door ajar switch

Was a problem found?

Go to Step 6

Go to Step 4

4

Connect a test lamp between the supply
voltage and ground circuits of the
inoperative lamp and activate the lamp.
Does the test lamp illuminate?

Go to Step 11

Go to Step 5

5

Test the supply voltage and ground circuits
of the inoperative lamp for an open or high
resistance. Refer to Circuit Testing and
Wiring Repairs .
Did you find and correct the condition?

Go to Step 13

Go to Step 9

6

Disconnect and test the switch of the
affected input circuit for proper continuity
in the open and closed positions. Refer to

2007 Hummer H3

2007 ACCESSORIES & EQUIPMENT Lighting - H3

Circuit Testing .
Does the switch operate properly?

Go to Step 7

Go to Step 8

7

Test the signal and ground circuits of the
affected input circuit for the following:

A short to ground

An open

A high resistance

Refer to Circuit Testing and Wiring
Repairs .
Did you find and correct the condition?

Go to Step 13

Go to Step 9

8

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

Go to Step 13

Go to Step 10

9

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

Go to Step 13

Go to Step 12

10

Replace the switch in the affected circuit.
Refer to one of the following replacement
procedures as applicable:

Headlamp Switch Replacement

Front Side Door Lock
Replacement

Rear Door Lock Replacement

Endgate Latch Replacement

Did you complete the replacement?

Go to Step 13

-

11

Replace the inoperative bulb. Refer to the
correct replacement procedure.
Did you complete the repair?

Go to Step 13

-

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

2007 Hummer H3

2007 ACCESSORIES & EQUIPMENT Lighting - H3

DAYTIME RUNNING LAMPS (DRL) ALWAYS ON

Daytime Running Lamps (DRL) Always On

12

setup and programming.
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: Headlights/Daytime Running Lights (DRL) 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

1. Carefully supply sufficient light to

the ambient light sensor.

2. Place the headlamps in the AUTO

position.

Does the system operate normally?

Go to Testing
for Intermittent
Conditions and
Poor
Connections

Go to Step 3

3

Remove the DRL fuse in the underhood
fuse block.
Do the DRL turn OFF?

Go to Step 4

Go to Step 7

4

1. Reinstall the DRL fuse.

2. Use the scan tool to observe the DRL

Status parameter while switching the
headlamp switch back and forth
several times between AUTO and
HEAD.

Does the DRL parameter change states as
expected?

Go to Step 5

Go to Step 6

Inspect for poor connections at the harness
connector of the underhood fuse block.
Refer to Testing for Intermittent

2007 Hummer H3

2007 ACCESSORIES & EQUIPMENT Lighting - H3

DAYTIME RUNNING LAMPS (DRL) INOPERATIVE

Daytime Running Lamps (DRL) Inoperative

5

Conditions and Poor Connections and
Connector Repairs .
Did you find and correct the condition?

Go to Step 10

Go to Step 8

6

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 .
Did you find and correct the condition?

Go to Step 10

Go to Step 9

7

Repair the DRL supply voltage circuit.
Refer to Wiring Repairs .
Did you complete the repair?

Go to Step 10

-

8

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

Go to Step 10

-

9

Replace the BCM. Refer to Control
Module References for replacement,
setup and programming.
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: Headlights/Daytime Running Lights (DRL) 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

1. Carefully supply sufficient light to the

ambient light sensor.

2007 Hummer H3

2007 ACCESSORIES & EQUIPMENT Lighting - H3