Hummer H3. Manual — part 1421

Is the fuse open?

Go to Step 10 Go to Step 4

4

With ignition switch in RUN,
test the supply voltage circuit at
the inoperative headlamp
leveling motor connector. Refer
to Circuit Testing .
Is the specified voltage present?

B+

Go to Step 5 Go to Step 11

5

Test the ground circuit at the
inoperative headlamp leveling
motor connector for continuity
to ground. Refer to Circuit
Testing .
Is continuity present?

-

Go to Step 6 Go to Step 12

6

Connect a digital multimeter
(DMM) from ground to the
headlamp leveling motor
supply voltage circuit at the
inoperative headlamp leveling
motor connector and adjust the
headlamp leveling switch from
the highest to lowest setting.
Refer to Circuit Testing .
Does the DMM display within
the specified range?

2.0 V-8.0 V

Go to Step 16 Go to Step 7

7

Test the ground circuit of the
headlamp leveling switch for
continuity to ground. Refer to
Circuit Testing .
Is there continuity?

-

Go to Step 8 Go to Step 13

8

Test the supply voltage circuit
at the headlamp leveling switch
connector. Refer to Circuit
Testing .
Is the specified voltage present?

B+

Go to Step 9 Go to Step 15

9

With the ignition switch in the
OFF position, test for an open,
high resistance, short to ground
or short to voltage in the
headlamp leveling motor

-

2007 Hummer H3

2007 ACCESSORIES & EQUIPMENT Lighting - H3

supply voltage circuit. Refer to
Circuit Testing .
Did you find a condition?

Go to Step 14 Go to Step 17

10

Test for a short to ground in the
supply voltage circuit. Refer to
Circuit Testing and Power
Distribution Schematics .
Did you find and correct a
condition?

-

Go to Step 18 Go to Step 16

11

Repair the open or high
resistance in the supply voltage
circuit. Refer to Wiring
Repairs .
Is repair complete?

-

Go to Step 18

-

12

Repair the open or high
resistance in the ground circuit.
Refer to Wiring Repairs .
Is repair complete?

-

Go to Step 18

-

13

Repair the open or high
resistance in the ground circuit.
Refer to Wiring Repairs .
Is repair complete?

-

Go to Step 18

-

14

Repair open, high resistance,
short to ground or short to
voltage in the headlamp
leveling motor supply voltage
circuit. Refer to Wiring
Repairs .
Did you complete the repair?

-

Go to Step 18

-

15

Repair the open or high
resistance in the supply voltage
circuit. Refer to Wiring
Repairs .
Did you complete the repair?

-

Go to Step 18

-

16

Replace the inoperative
headlamp leveling motor. Refer
to Headlamp Replacement.
Is repair complete?

-

Go to Step 18

-

2007 Hummer H3

2007 ACCESSORIES & EQUIPMENT Lighting - H3

HIGH BEAM INDICATOR ALWAYS ON

High Beam Indicator Always On

17

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

-

Go to Step 18

-

18

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 Diagnostic System
Check - Vehicle?

Go to Step 2

Go to
Diagnostic
System Check -
Vehicle

2

Verify that the high beam indicator is
always ON.
Does the high beam indicator operate
normally?

Go to Testing
for Intermittent
Conditions and
Poor
Connections

Go to Step 3

3

1. Turn the ignition switch to the RUN

position.

2. Turn the headlamp switch to the ON

position.

3. Place the turn signal/multifunction

switch to the high beams position.

Do the high beam headlamps function
properly?

Go to Step 4

Go to
Symptoms -
Lighting
Systems

4

1. Place the turn signal/multifunction

switch to the low beams position.

2. Using a scan tool, select the IPC

Special Functions Display Test to
command the high beam indicator
ON, then OFF.

Does the high beam indicator lamp turn

Go to Testing
for Intermittent
Conditions and
Poor

2007 Hummer H3

2007 ACCESSORIES & EQUIPMENT Lighting - H3

HIGH BEAM INDICATOR INOPERATIVE

High Beam Indicator Inoperative

ON and OFF when commanded?

Connections

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 .
Did you find and correct the condition?

Go to Step 7

Go to Step 6

6

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

Go to Step 7

-

7

1. Use the scan tool in order to clear any

induced DTCs.

2. 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 Diagnostic System
Check - Vehicle?

Go to Step 2

Go to
Diagnostic
System Check -
Vehicle

2

Verify that the high beam indicator is
inoperative.
Does the high beam indicator operate
normally?

Go to Testing
for Intermittent
Conditions and
Poor
Connections

Go to Step 3

3

1. Turn the ignition switch to the RUN

position.

2. Turn the headlamp switch to the ON

position.

3. Place the turn signal/multifunction

switch to the high beams position.

Do the high beam headlamps function

Go to
Symptoms -
Lighting

2007 Hummer H3

2007 ACCESSORIES & EQUIPMENT Lighting - H3