Hummer H2. Manual - part 740

3

wiper switch high signal circuit terminal to ground.  

3. Turn the ignition ON.  

Do the windshield wipers operate at high speed?

Go to 

Step 8

Go to Step 4

4

1. Disconnect the windshield wiper motor and module 

connector.  

2. Connect a test lamp from the accessory voltage 

supply circuit terminal in the windshield wiper 
motor harness connector to a good ground.  

3. Turn the ignition ON.  

Does the test lamp illuminate?

Go to 

Step 5

Go to Step 6

5

Connect a test lamp from battery positive voltage to the 
windshield wiper motor ground circuit terminal in the 
windshield wiper motor harness connector. 
Does the test lamp illuminate?

Go to 

Step 10

Go to Step 7

6

Repair the accessory voltage supply circuit to the 
windshield wiper motor and module for an open or short to 
ground. Refer to Circuit Testing and Wiring Repairs in 
Wiring Systems. 
Is the repair complete?

Go to 

Step 12

-

7

Repair the windshield wiper motor and module ground 
circuit for an open or high resistance. Refer to Circuit 
Testing and Wiring Repairs in Wiring Systems. 
Is the repair complete?

Go to 

Step 12

-

8

Inspect for poor connections at the windshield 
wiper/washer 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 9

9

Replace the windshield wiper/washer switch. Refer to 
Multifunction, Turn Signal Switch Replacement in 
Steering Wheel and Column. 
Is the repair complete?

Go to 

Step 12

-

10

Inspect for poor connections at the windshield wiper motor 
and module. Refer to Testing for Intermittent 
Conditions and Poor Connections and to Connector 
Repairs in Wiring Systems. 
Did you find and correct the condition?

Go to 

Step 12

Go to Step 11

11

Replace the windshield wiper motor and module. Refer to 
Wiper Motor Replacement . 
Is the repair complete?

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

 

2004 Hummer H2 

2004 ACCESSORIES & EQUIPMENT Wipers/Washer Systems - Hummer H2

  

WIPERS INOPERATIVE - ONE OR MORE MODES

Test Description 

The numbers below refer to the step numbers on the diagnostic table. 

5: This step tests for continuity through the 390 ohm resistor in the windshield wiper/washer switch.  

6: This step tests for continuity through the delay resistors in the windshield wiper/washer switch. The 
measured resistance will change in sequence from low to high as the delay speed is increased.  

Wipers Inoperative - One or More Modes 

Step

Action

Values

Yes

No

Schematic Reference:Wiper/Washer System Schematics 
Connector End View Reference:Wiper/Washer System Connector End Views 
DEFINITION: Windshield wipers are inoperative in one or more modes.

1

Did you perform the Wiper/Washer System 
Description and Operation and perform the 
necessary inspections?

-

Go to Step 2

Go to Symptoms -

Wiper/Washer 

Systems

2

1. Turn ON the ignition.  

2. Attempt to operate the windshield 

wipers in all modes.  

Does the system operate normally?

-

Go to Testing for 

Intermittent 

Conditions and Poor 

Connections in 

Wiring Systems

Go to Step 3

3

Do the windshield wipers operate in the high 
speed mode?

-

Go to Step 5

Go to Step 4

4

1. Disconnect the turn signal/multifunction 

switch connectors.  

2. Connect a fused jumper wire from the 

windshield wiper switch high signal 
circuit terminal in the body harness 
connector half to a good ground.  

3. Turn ON the ignition.  

Do the windshield wipers operate at high 
speed?

-

Go to Step 8

Go to Step 7

5

1. Disconnect the turn signal/multifunction 

switch connectors.  

2. Test the resistance from the windshield 

wiper switch voltage supply circuit 
terminal to the windshield wiper switch 
signal circuit terminal in the turn 
signal/multifunction switch.  

3. Operate the windshield wiper/washer 

390 

ohm

 

2004 Hummer H2 

2004 ACCESSORIES & EQUIPMENT Wipers/Washer Systems - Hummer H2

  

switch in the following positions: 

z

MIST  

z

LO  

Is the resistance near the specified value in the 
listed switch positions?

Go to Step 6

Go to Step 11

6

1. Test the resistance from the windshield 

wiper switch voltage supply circuit 
terminal to the windshield wiper switch 
signal circuit terminal in the turn 
signal/multifunction switch.  

2. Operate the windshield wiper/washer 

switch in all of the delay positions.  

Does the resistance remain within the specified 
values from low to high as the delay speed is 
increased?

1K 

ohm-

10K 

ohm

Go to Step 9

Go to Step 11

7

1. Disconnect the windshield wiper motor 

and module connector.  

2. Test the windshield wiper switch high 

signal circuit 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 16

Go to Step 14

8

Test the windshield wiper switch ground 
circuit 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 16

Go to Step 12

9

Test the windshield wiper switch voltage 
supply circuit for an open or short to ground. 
Refer to Circuit Testing and Wiring Repairs 
in Wiring Systems. 
Did you find and correct the condition?

-

Go to Step 16

Go to Step 10

10

Test the windshield wiper switch signal circuit 
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 16

Go to Step 14

11

Test the windshield wiper switch voltage 
supply and signal circuits in the steering 
column harness for an open or short to ground. 
Refer to Circuit Testing and Wiring Repairs 

-

 

2004 Hummer H2 

2004 ACCESSORIES & EQUIPMENT Wipers/Washer Systems - Hummer H2

  

WASHER INOPERATIVE - REAR 

Washer Inoperative - Rear 

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

Go to Step 16

Go to Step 12

12

Inspect for poor connections at the turn 
signal/malfunction 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 16

Go to Step 13

13

Replace the turn signal/malfunction switch. 
Refer to Multifunction, Turn Signal Switch 
Replacement in Steering Wheel and Column.
Is the repair complete?

-

Go to Step 16

-

14

Inspect for poor connections at the windshield 
wiper motor and module. 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 16

Go to Step 15

15

Replace the windshield wiper motor and 
module. Refer to Wiper Motor 
Replacement . 
Is the repair complete?

-

Go to Step 16

-

16

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: Wiper/Washer System Schematics 
Connector End View Reference: Wiper/Washer System Connector End Views 
DEFINITION: The rear window washer is inoperative and the windshield washers operate normally.

1

Did you review the Rear Wiper/Washer System 
Description and Operation and perform the 
necessary inspections?

Go to Step 2

Go to Symptoms - 

Wiper/Washer 

Systems

2

1. Turn the ignition ON.  

2. Press the rear window washer switch.  

Does the rear window washer operate normally?

Go to Testing for 

Intermittent Conditions 

and Poor Connections in 

Wiring Systems

Go to Step 3

3

Does the rear window wiper operate when the 
washer switch is pressed?

Go to Step 4

Go to Step 8

1. Disconnect the washer fluid pump relay.  

2. Connect a test lamp from the washer fluid 

 

2004 Hummer H2 

2004 ACCESSORIES & EQUIPMENT Wipers/Washer Systems - Hummer H2