Hummer H3. Manual — part 1424

Do the off-road lamps illuminate?

Go to Step 15

Go to Step 8

8

Connect a 3-amp fused jumper wire
between the battery positive circuit and
the off-road lamp supply voltage circuit of
the off-road lamps relay.
Do the off-road lamps illuminate?

Go to Step 9

Go to Step 11

9

Test the off-road lamp relay control circuit
of the off-road lamps switch for high
resistance, short to ground or an open.
Refer to Circuit Testing and Wiring
Repairs .
Did you find and correct the condition?

Go to Step 21

Go to Step 10

10

Test the ground circuit of the off-road
lamps relay for high resistance or an open.
Refer to Circuit Testing and Wiring
Repairs .
Did you find and correct the condition?

Go to Step 21

Go to Step 11

11

Test the battery positive voltage circuit of
the off-road lamps relay for high resistance
or an open. Refer to Circuit Testing and
Wiring Repairs .
Did you find and correct the condition?

Go to Step 21

Go to Step 12

12

Test the ground circuit of the off-road
lamps for high resistance or an open. Refer
to Circuit Testing and Wiring Repairs .
Did you find and correct the condition?

Go to Step 21

Go to Step 17

13

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

Go to Step 21

Go to Step 18

14

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

Go to Step 21

Go to Step 19

2007 Hummer H3

2007 ACCESSORIES & EQUIPMENT Lighting - H3

PARK LAMPS INOPERATIVE

Park Lamps Inoperative

15

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

Go to Step 21

Go to Step 20

16

Repair the battery positive voltage circuit
of the off-road lamps switch. Refer to
Wiring Repairs .
Did you complete the repair?

Go to Step 21

-

17

Repair the supply voltage circuit of the
off-road lamps. Refer to Wiring Repairs .
Did you complete the repair?

Go to Step 21

-

18

Replace the inoperative off-road lamp.
Refer to Off Road Lamp Bulb
Replacement.
Did you complete the replacement?

Go to Step 21

-

19

Replace the inoperative off-road lamps
relay. Refer to Relay Replacement
(Attached to Wire Harness) or Relay
Replacement (Within an Electrical
Center) .
Did you complete the replacement?

Go to Step 21

-

20

Replace the off-road lamps switch. Refer
to Off Road Lamp Switch
Replacement.
Did you complete the replacement?

Go to Step 14

-

21

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

Did you perform the Diagnostic System

Go to

2007 Hummer H3

2007 ACCESSORIES & EQUIPMENT Lighting - H3

PARK, LICENSE AND TAIL LAMPS ALWAYS ON

Park, License and Tail Lamps Always On

1

Check - Vehicle?

Go to Step 2

Diagnostic
System Check -
Vehicle

2

Verify that the front park lamps are
inoperative.
Do the park lamps operate normally?

Go to Testing
for Intermittent
Conditions and
Poor
Connections

Go to Step 3

3

Inspect the FRT PARK LAMP fuse in the
underhood fuse block.
Is the fuse open?

Go to Step 5

Go to Step 4

4

Inspect the inoperative bulbs/sockets for
open or shorted filaments/terminals.
Does any lamp have an open or shorted
filament/terminals?

Go to Step 7

Go to Step 6

5

Repair the short to ground in the park
lamps supply voltage circuit. Refer to
Wiring Repairs .
Did you complete the repair?

Go to Step 8

-

6

Repair an open or high resistance in the
park lamps supply voltage circuit or
ground circuit to the inoperative lamp.
Refer to Wiring Repairs .
Did you complete the repair?

Go to Step 8

-

7

Replace the defective bulb/socket. Refer
to Daytime Running Lamp Bulb
Replacement.
Did you complete the repair?

Go to Step 8

-

8

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 Data

2007 Hummer H3

2007 ACCESSORIES & EQUIPMENT Lighting - H3

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

Go to Testing

for Intermittent

Conditions and

Poor

Connections

Go to Step 3

3

Remove the park lamp relay. Refer to
Relay Replacement (Attached to Wire
Harness) or Relay Replacement (Within
an Electrical Center) .
Do the park lamps turn OFF?

Go to Step 4

Go to Step 9

4

1. Ensure that the headlamp switch is in

the OFF or AUTO position and there
is sufficient light to the ambient light
sensor.

2. Test for a ground signal at the park

lamp relay control circuit terminal in
the underhood fuse block. Refer to
Electrical Center Identification
Views and Circuit Testing .

Was a ground signal present?

Go to Step 5

Go to Step 10

5

Use the scan tool to check the body control
module (BCM) Park Lamp Switch input
data.
Does the scan tool indicate a park lamps
OFF request signal?

Go to Step 8

Go to Step 6

6

Test for a short to ground in the park lamp
switch on signal circuit. Refer to Circuit
Testing and Wiring Repairs .
Did you find and correct the condition?

Go to Step 13

Go to Step 7

7

Inspect for poor connections at the harness
connector of the headlamp and panel
dimmer switch. Refer to Circuit Testing

2007 Hummer H3

2007 ACCESSORIES & EQUIPMENT Lighting - H3