Hummer H3. Manual — part 1427

TAIL LAMPS INOPERATIVE

Tail Lamps Inoperative

11

Refer to Wiring Repairs , Tail Lamp
Bulb Replacement or High Mount Stop
Lamp Replacement.
Is the repair complete?

Go to Step 14

-

12

Replace the stop lamp switch. Refer to
Stop Lamp Switch Replacement.
Did you complete the replacement?

Go to Step 14

-

13

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

Go to Step 14

-

14

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

2

Verify that the tail lamps are inoperative.
Do the tail lamps operate normally?

Go to Testing

for Intermittent

Conditions and

Poor

Connections

Go to Step 3

3

Inspect the appropriate fuse for the
inoperative lamps 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

2007 Hummer H3

2007 ACCESSORIES & EQUIPMENT Lighting - H3

TURN SIGNAL LAMPS AND/OR INDICATORS ALWAYS ON OR FLASHING

Turn Signal Lamps and/or Indicators Always On or Flashing

5

Repair the short to ground in the inoperative
tail lamps supply voltage circuit or license
lamp supply voltage circuit. Refer to
Wiring Repairs .
Did you complete the repair?

Go to Step 8

-

6

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

Go to Step 8

-

7

Replace the defective bulb/socket. Refer to
Tail 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
Communication Connector End Views

1

Did you perform the Diagnostic System
Check - Vehicle?

Go to Step

Go to
Diagnostic
System Check -
Vehicle

2

Verify that the turn signal lamps and/or
indicators are always ON or flashing.
Do the turn signal lamps operate normally?

Go to Testing
for Intermittent
Conditions and
Poor
Connections

Go to Step 3

3

Inspect the affected bulb/socket for an
internal short, poor terminal contact or a
shorted filament.
Was a problem found?

Go to Step 8

Go to Step 4

Disconnect the multifunction turn signal

2007 Hummer H3

2007 ACCESSORIES & EQUIPMENT Lighting - H3

TURN SIGNAL LAMPS AND/OR INDICATORS INOPERATIVE

Turn Signal Lamps and/or Indicators Inoperative

4

switch.
Do the affected turn signals and indicators
still illuminate?

Go to Step 5

Go to Step 6

5

Test for a high resistance or short to ground
in the turn signal switch signal circuit.
Did you find and correct the condition?

Go to Step 11

Go to Step 7

6

Inspect for poor connections at the
multifunction turn signal switch. Refer to
Circuit Testing and Wiring Repairs .
Did you find and correct the condition?

Go to Step 11

Go to Step 9

7

Inspect for poor connections at the body
control module (BCM). Refer to Circuit
Testing and Wiring Repairs .
Did you find and correct the condition?

Go to Step 11

Go to Step 10

8

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

Go to Step 11

-

9

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

Go to Step 11

-

10

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

Go to Step 11

-

11

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: Exterior Lights 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 turn signal lamps and/or
indicators are inoperative.
Do the turn signal lamps and/or indicators
operate normally?

Go to Testing

for Intermittent

Conditions and

Poor

Connections

Go to Step 3

3

Are only the turn signal indicators in the
instrument panel cluster (IPC) inoperative?

Go to Step 4

Go to Step 5

4

Test the inoperative turn signal supply
voltage circuit to the IPC 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 7

5

1. Place the ignition switch to the ON

position with the engine OFF.

2. Using a scan tool, command the left

and right turn signals ON and OFF
with the BCM special functions scan
tool output controls.

Can you activate the turn signals with the
scan tool?

Go to Step 6

Go to Step 9

6

Test for one of the following conditions.
Refer to Circuit Testing and Wiring
Repairs .

An open, high resistance, short to
ground or short to voltage in the turn
signal switch signal circuit

An open or high resistance in the turn
signal/multifunction switch ground
circuit

2007 Hummer H3

2007 ACCESSORIES & EQUIPMENT Lighting - H3