Hummer H2. Manual — part 326

TURN SIGNAL LAMPS AND/OR INDICATORS ALWAYS ON OR FLASHING

Turn Signal Lamps and/or Indicators Always On or Flashing

3

Are all the stop lamps inoperative?

Go to Step 6

Go to Step 4

4

Test the supply voltage circuit of the inoperative lamp
for high resistance, an open, or a short to ground.
Refer to Circuit Testing and Wiring Repairs in
Wiring Systems.
Did you find and correct the condition?

Go to Step 12

Go to Step 5

5

Test the ground circuit of the inoperative lamp for
high resistance or an open. Refer to Circuit Testing
and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?

Go to Step 12

Go to Step 8

6

Test the battery positive circuit of the stoplamp
switch for high resistance, an open or a short to
ground. Refer to Circuit Testing and Wiring
Repairs in Wiring Systems.
Did you find and correct the condition?

Go to Step 12

Go to Step 7

7

Test the stop lamp switch signal circuit of the
stoplamp switch for a short to ground, high resistance
or an open. Refer to Wiring Repairs in Wiring
Systems.
Did you find and correct the condition?

Go to Step 12

Go to Step 9

8

Inspect for poor connections at the harness connector
of the bulb or high mount stop lamp. Refer to Testing
for Intermittent Conditions and Poor Connections
and Connector Repairs in Wiring Systems.
Did you find and correct the condition?

Go to Step 12

Go to Step 10

9

Inspect for poor connections at the harness connector
of the switch. Refer to Testing for Intermittent
Conditions and Poor Connections and Connector
Repairs in Wiring Systems.
Did you find and correct the condition?

Go to Step 12

Go to Step 11

10

Replace the stop lamp. Refer to Tail/Turn Signal
Lamp Replacement (SUV) or High Mounted Stop
Lamp Replacement (SUV) .
Did you complete the replacement?

Go to Step 12

-

11

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

Go to Step 12

-

12

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

2004 Hummer H2

2004 ACCESSORIES & EQUIPMENT Lighting Systems - Hummer H2

Connector End View Reference: Lighting Systems Connector End Views or Body Control System
Connector End Views in Body Control System.

1

Did you perform the Lighting Diagnostic System
Check?

Go to Step 2

Go to Diagnostic

System Check -

Lighting Systems

2

1. Turn ON the ignition, with the engine OFF.

2. Operate the turn signal switch in both the left

and right hand turn signal positions.

Does the turn signal system operate normally?

Go to Testing for

Electrical

Intermittents in

Wiring Systems

Go to Step 3

3

Test the appropriate turn signal bulb supply voltage
circuit for a short to voltage. Refer to Circuit Testing
and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?

Go to Step 10

Go to Step 4

4

1. Disconnect the turn signal/hazard flasher

module.

2. Connect a test lamp between the appropriate turn

signal switch signal circuit terminal of the turn
signal/hazard flasher module connector and a
good ground.

Does the test lamp illuminate?

Go to Step 5

Go to Step 6

5

Test the appropriate turn signal switch signal circuit
for a short to voltage. Refer to Circuit Testing and
Wiring Repairs in Wiring Systems.
Did you find and correct the condition?

Go to Step 10

Go to Step 7

6

Inspect for poor connections at the harness connector
of the turn signal/hazard flasher module. Refer to
Testing for Intermittent Conditions and Poor
Connections and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?

Go to Step 10

Go to Step 8

7

Inspect for poor connections at the harness connector
of the turn/hazard switch. Refer to Testing for
Intermittent Conditions and Poor Connections and
Wiring Repairs in Wiring Systems.
Did you find and correct the condition?

Go to Step 10

Go to Step 9

8

Replace the turn signal/hazard flasher module.
Did you complete the replacement?

Go to Step 10

-

9

Replace the multifunction, turn signal and hazard
switch. Refer to Multifunction, Turn Signal Switch
Replacement in Steering Wheel and Column.
Did you complete the replacement?

Go to Step 10

-

10

Operate the system in order to verify the repair.
Did you correct the condition?

System OK

Go to Step 3

2004 Hummer H2

2004 ACCESSORIES & EQUIPMENT Lighting Systems - Hummer H2

TURN SIGNAL LAMPS AND/OR INDICATORS INOPERATIVE

Turn Signal Lamps and/or Indicators Inoperative

Step Action

Yes

No

Schematic Reference: Exterior Lights Schematics
Connector End View Reference: Lighting Systems Connector End Views or Body Control System
Connector End Views in Body Control System.

1

Did you perform the Lighting Systems Diagnostic
System Check?

Go to Step 2

Go to Diagnostic

System Check -

Lighting

Systems

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 in Wiring

Systems

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 in Wiring Systems.
Did you find and correct the condition?

Go to Step 21

Go to Step 13

5

Is only one turn signal lamp inoperative?

Go to Step 6

Go to Step 8

6

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

Go to Step 18

Go to Step 7

7

Test for an open, high resistance, or short to ground in
the turn signal lamp supply voltage circuit. Refer to
Circuit Testing and Wiring Repairs in Wiring
Systems.
Did you find and correct the condition?

Go to Step 21

Go to Step 16

8

Inspect the IGN E fuse and the FLASHER fuse.
Is either fuse open?

Go to Step 11

Go to Step 9

9

Test for an open or high resistance in the following
circuits:

z

The turn/hazard flasher battery positive supply
voltage

z

The turn/hazard flasher ground

z

The turn signal switch ignition 1 supply voltage

Refer to Circuit Testing and Wiring Repairs in
Wiring Systems.
Did you find and correct the condition?

Go to Step 21

Go to Step 10

2004 Hummer H2

2004 ACCESSORIES & EQUIPMENT Lighting Systems - Hummer H2

10

1. Disconnect the multifunction switch, turn signal

switch.

2. Test the multifunction turn signal switch for

continuity between the multifunction turn signal
switch ignition 1 voltage input terminal and the
turn signal flasher signal output terminal in each
respective position. Refer to Circuit Testing in
Wiring Systems.

Is continuity present?

Go to Step 12

Go to Step 14

11

Test the following circuits for a short to ground:

z

The multifunction turn signal switch ignition 1
voltage

z

The turn/hazard flasher supply voltage

z

The left turn signal switch signal

z

The right turn signal switch signal

z

The left turn signal lamps supply voltage

z

The right turn signal lamps supply voltage

z

The trailer left rear turn/stop lamp supply voltage

z

The trailer right rear turn/stop lamp supply
voltage

Refer to Circuit Testing and Wiring Repairs in
Wiring Systems.
Did you find and correct the condition?

Go to Step 21

Go to Step 14

12

Test the following circuits for an open or high
resistance:

z

The multifunction turn signal switch ignition 1
voltage

z

The turn/hazard flasher supply voltage

z

The left turn signal switch signal

z

The right turn signal switch signal

z

The left turn signal lamps supply voltage

z

The right turn signal lamps supply voltage

z

The trailer left rear turn/stop lamp supply voltage

z

The trailer right rear turn/stop lamp supply
voltage

2004 Hummer H2

2004 ACCESSORIES & EQUIPMENT Lighting Systems - Hummer H2