Hummer H3. Manual — part 1420

switch headlamps off signal circuit.

Did you find and correct a condition?

Go to Step 20

Go to Step 12

9

1. Remove the headlamp relay. Refer to

Relay Replacement (Attached to
Wire Harness) or Relay
Replacement (Within an Electrical
Center) .

2. Place a fused jumper between the

battery positive voltage circuit and
headlamp supply voltage circuit
terminals to the headlamp relay in the
underhood fuse block. Refer to
Electrical Center Identification
Views .

Do the low or high beam headlamps
illuminate?

Go to Step 10

Go to Step 14

10

Test for a ground signal at the headlamp
relay control circuit connector terminal.
Refer to Circuit Testing and Electrical
Center Identification Views .
Is a ground control signal present?

Go to Step 16

Go to Step 11

11

Test for an open or high resistance in the
headlamp relay control circuit. Refer to
Circuit Testing and Electrical Center
Identification Views .
Did you find and correct a condition?

Go to Step 20

Go to Step 12

12

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 20

Go to Step 15

13

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

Go to Step 20

Go to Step 17

2007 Hummer H3

2007 ACCESSORIES & EQUIPMENT Lighting - H3

HEADLAMPS FLASH TO PASS INOPERATIVE

Headlamps Flash to Pass Inoperative

14

Inspect for poor connections at the harness
connector of the underhood fuse block and
terminals at the beam select relay. Refer to
Circuit Testing and Wiring Repairs .
Did you complete the repair?

Go to Step 20

Go to Step 18

15

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

Go to Step 20

-

16

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

Go to Step 20

-

17

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

Go to Step 20

-

18

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

Go to Step 20

-

19

Replace the turn signal/multifunction switch.
Refer to Turn Signal Multifunction
Switch Replacement .
Did you complete the repair?

Go to Step 20

-

20

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

2007 Hummer H3

2007 ACCESSORIES & EQUIPMENT Lighting - H3

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

Verify that the flash to pass (FTP) is
inoperative.
Does the FTP operate normally?

Go to Testing
for Intermittent
Conditions and
Poor
Connections

Go to Step 3

3

Do the high beam headlamps operate
normally?

Go to Step 4

Go to
Symptoms -
Lighting
Systems

4

1. Turn the key to RUN with the

engine OFF.

2. Connect a fused jumper from ground

to the flash to pass switch signal
terminal of the turn
signal/multifunction switch
connector.

Do the high beam headlamps illuminate?

Go to Step 6

Go to Step 5

5

Test the flash to pass signal circuit for an
open or high resistance. Refer to Circuit
Testing and Wiring Repairs .
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 turn
signal/multifunction switch. Refer to
Circuit Testing and Wiring Repairs .
Did you find and correct the condition?

Go to Step 10

Go to Step 9

7

Inspect for poor connections at the
harness connector of the body control
module (BCM). Refer to Circuit Testing
and Wiring Repairs .

2007 Hummer H3

2007 ACCESSORIES & EQUIPMENT Lighting - H3

HEADLIGHT LEVELING INOPERATIVE

Headlight Leveling Inoperative

Did you find and correct the condition?

Go to Step 10

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 10

-

9

Replace the turn signal/multifunction
switch. Refer to Turn Signal
Multifunction Switch Replacement .
Did you complete the repair?

Go to Step 10

-

10

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

Value(s)

Yes

No

Schematic Reference: Headlight Leveling Schematics
Connector End View Reference: Lighting Systems Connector End Views

1

Did you review the Exterior
Lighting Systems Description
and Operation and perform the
necessary inspections?

-

Go to Step 2

Go to

Exterior

Lighting

Systems

Description

and

Operation

2

Verify that the headlight
leveling is inoperative.
Does the headlight leveling
operate normally?

-

Go to Testing

for

Intermittent

Conditions

and Poor

Connections Go to Step 3

3

Inspect the HD LMP
LEVELING fuse in the
underhood fuse block.

-

2007 Hummer H3

2007 ACCESSORIES & EQUIPMENT Lighting - H3