Hummer H3. Manual — part 1417

HAZARD LAMPS INOPERATIVE

Hazard Lamps Inoperative

Does the scan tool display Active?

Go to Step 4

Go to Step 5

4

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

Go to Step 9

Go to Step 6

5

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

Go to Step 9

Go to Step 7

6

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

Go to Step 9

Go to Step 8

7

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

Go to Step 9

-

8

Replace the hazard switch. Refer to
Hazard Warning Switch Replacement.
Did you complete the repair?

Go to Step 9

-

9

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

Schematic Reference: Exterior 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

2007 Hummer H3

2007 ACCESSORIES & EQUIPMENT Lighting - H3

2

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

Go to Testing
for Intermittent
Conditions and
Poor
Connections

Go to Step 3

3

1. Ensure that the hazard lamp switch

is in the ON position.

2. With a scan tool, observe the Hazard

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 5

4

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

Go to Step 9

Go to Step 6

5

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

Go to Step 9

Go to Step 7

6

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

Go to Step 9

Go to Step 8

7

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

Go to Step 9

-

8

Replace the hazard switch. Refer to
Hazard Warning Switch Replacement.
Did you complete the repair?

Go to Step 9

-

9

1. Use the scan tool in order to clear

any induced DTCs.

2. Operate the system in order to verify

the repair.

2007 Hummer H3

2007 ACCESSORIES & EQUIPMENT Lighting - H3

HEADLAMP LOW OR HIGH BEAMS ALWAYS ON

Headlamp Low or High Beams Always On

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

Verify that the low or high beam headlamps
are always ON.
Do the low and high beam headlamps
operate normally?

Go to Testing
for Intermittent
Conditions and
Poor
Connections

Go to Step 3

3

Does the Wiper Activated Headlamp
(WAH) function of the wiper system
operate normally?

Go to Step 6

Go to Step 4

4

With the key in RUN and the wiper switch
in the OFF position, use the scan tool to
monitor the Front Wipers Active input
parameter.
Does the scan tool parameter display
Inactive?

Go to Step 13

Go to Step 5

5

Test the windshield wiper switch signal 1
circuit for a short to ground. Refer to
Circuit Testing and Wiring Repairs .
Did you find and correct the condition?

Go to Step 21

Go to Step 20

6

Can you illuminate both low and high beam
headlamps at the same time when activating
the headlamp dimmer switch?

Go to Step 15

Go to Step 7

1. Place the headlamp and panel dimmer

switch in the OFF position.

2. Turn the ignition ON with the engine

2007 Hummer H3

2007 ACCESSORIES & EQUIPMENT Lighting - H3

7

OFF.

3. With a scan tool, observe the

Headlamp OFF Switch data
parameter in the Body Control
Module (BCM) data list.

Does the scan tool display Active?

Go to Step 10

Go to Step 8

8

1. Disconnect the headlamp and panel

dimmer switch. Refer to Headlamp
Switch Replacement.

2. Place a fused jumper between the

headlamp switch headlamps OFF
signal circuit and low reference circuit
terminals.

Does the scan tool display Active?

Go to Step 14

Go to Step 9

9

Test for an open or high resistance in one of
the following headlamp and panel dimmer
switch circuits. Refer to Circuit Testing
and Wiring Repairs .

The headlamp switch headlamps OFF
signal

The low reference circuit

Did you find and correct a condition?

Go to Step 21

Go to Step 13

10

Remove the headlamp relay. Refer to Relay
Replacement (Attached to Wire
Harness) or Relay Replacement (Within
an Electrical Center) .
Do the low or high beam headlamps remain
always ON?

Go to Step 16

Go to Step 11

11

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 12

Go to Step 18

2007 Hummer H3

2007 ACCESSORIES & EQUIPMENT Lighting - H3