Hummer H3. Manual — part 1739

4. Disconnect the windshield wiper motor connector.

5. Connect a test lamp between the low speed control circuit and the ground circuit.

6. The test lamp should illuminate with the windshield wiper switch in the Low speed position.

If the test lamp does not illuminate test the wiper motor low speed circuit and
underhood fuse block for an open/high resistance.

7. If all the circuits test normal replace the windshield wiper motor.

High Speed Wipers Inoperative

1. Operate the wiper switch to the High speed position.

2. With the ignition on verify that the Front Wipers Active parameter in the BCM inputs data

list is On.

If the Front Wipers Active parameter is not On perform the windshield wiper washer
switch high speed component test, test the windshield wiper switch signal 2 circuit and
underhood fuse block for an open/high resistance. If the circuit and switch test normal
replace the wiper diode #90.

3. Disconnect the windshield wiper motor connector.

4. Verify that a test lamp will illuminate when connected between the high speed control

circuit and the ground circuit.

If the test lamp does not illuminate test the wiper motor high speed circuit for an
open/high resistance. If the circuit tests normal replace the HI/LOW WPR relay.

5. If all the circuits test normal replace the windshield wiper motor.

Low Speed Wipers Always On

1. Ignition ON, verify that the Wiper Relay Command parameter on the BCM outputs data list

is Off.

If the scan tool displays On test the windshield wiper switch signal 1 circuit for a short
to voltage and perform the windshield wiper washer switch low speed component test.
If the circuit and switch test normal replace the body control module.

2. Verify that the Front Wipers Active parameter on the BCM inputs data list is Off.

If the scan tool displays On test the wiper relay control circuit for a short to voltage. If
the circuit tests normal replace the BCM.

3. Verify that the wipers stop when the ON/OFF WPR relay is removed.

If the wipers remain on test the windshield wiper motor low speed control circuit for a
short to voltage.

2007 Hummer H3

2007 ACCESSORIES & EQUIPMENT Wipers and Washers - H3

4. If all the circuits test normal replace the ON/OFF WPR relay.

High Speed Wipers Always On

1. Verify that the Front Wipers Active parameter on the BCM inputs data list is Off.

If the scan tool displays On test the windshield wiper washer switch signal 2 circuit for
a short to voltage and perform the windshield wiper washer switch high speed
component test.

2. Disconnect the windshield wiper motor connector.

3. Wiper switch OFF, verify that a test lamp will not illuminate when connected between the

wiper motor high speed control circuit and ground.

If the test lamp illuminates repair the wiper motor high speed control circuit for a short
to voltage. If the circuit tests normal replace the underhood fuse block.

Washers Inoperative

1. Display the Washer Switch parameter on the BCM Inputs data list.

2. Ignition ON, verify that the Washer Switch parameter is On while the washer switch is

pressed.

If the scan tool displays Off perform the windshield washer switch component test. If
the switch tests normal repair the windshield washer pump control circuit from the
switch to the BCM for an open/high resistance.

3. Disconnect the windshield washer pump connector.

4. A test lamp connected between the washer pump control circuits should illuminate while the

washer switch is pressed.

If the test lamp does not illuminate repair the windshield washer pump control circuit
from the BCM to the pump or the ground circuit for an open/high resistance.

5. If all the circuits test normal replace the windshield washer pump.

Washers Always On

1. Disconnect the steering column harness to instrument panel (I/P) harness inline connector

C201.

2. Ignition ON, the windshield washers should not be ON.

If the windshield washers remain on repair the windshield washer pump control circuit
for a short to voltage.

3. If the windshield washers turn off replace the windshield wiper washer switch.

2007 Hummer H3

2007 ACCESSORIES & EQUIPMENT Wipers and Washers - H3

Component Testing

Windshield Wiper Washer Switch High and Wash circuits.

1. Disconnect the steering column harness to I/P harness inline connector C201.

2. Connect a DMM from the accessory voltage supply circuit terminal to the windshield wiper

switch signal 2 circuit terminal in the steering column connector half.

3. The DMM should indicate continuity while the wiper switch is in the High speed position.

If the DMM does not display 0-2 ohms replace the windshield wiper washer switch.

4. The DMM should indicate no continuity while the wiper switch is in any position other than

High.

If the DMM does not display infinite resistance replace the windshield wiper washer
switch.

5. Connect a DMM from the accessory voltage supply circuit terminal to the windshield

washer pump control circuit terminal.

6. The DMM should indicate continuity while the windshield washer switch is pressed.

If the DMM does not display 0-2 ohms replace the windshield wiper washer switch.

7. The DMM should indicate no continuity when the windshield washer switch is released.

If the DMM does not display infinite resistance replace the windshield wiper washer
switch.

Windshield Wiper Washer Switch Low Speed Circuit

1. Disconnect the Steering Column harness to I/P harness inline connector C201.

2. Connect a DMM from the accessory voltage supply circuit terminal to the windshield wiper

switch signal 2 circuit terminal in the steering column connector half.

3. Operate the windshield wiper switch from Off to Mist, Delay 1 through 5, Low and High.

If the DMM does not display at or near the resistance values provided replace the
windshield wiper washer switch.

Windshield Wiper Washer System Malfunction

IMPORTANT: If the switch tests open in any switch position other than Off

test wiper switch signal 1 circuit for a short to ground before
replacing the switch.

Switch Position

Resistance

Off

Infinite

2007 Hummer H3

2007 ACCESSORIES & EQUIPMENT Wipers and Washers - H3

Repair Procedures

Windshield Washer Pump Replacement

Windshield Wiper Motor Replacement

Turn Signal Multifunction Switch Replacement

REAR WIPER WASHER SYSTEM MALFUNCTION

Diagnostic Fault Information

Rear Wiper Washer System Malfunction

Mist

1.78K ohms

Delay 1

9.43K ohms

Delay 2

6.82K ohms

Delay 3

4.95K ohms

Delay 4

3.55K ohms

Delay 5

2.53K ohms

Low

1.78K ohms

High

1.78K ohms

IMPORTANT: Always perform the Diagnostic Repair Verification after

completing the diagnostic procedure.

IMPORTANT: Always perform the Diagnostic System Check - Vehicle prior to

using this diagnostic procedure.

Circuit

Short to

Ground

Open/High

Resistance

Short to
Voltage

Signal

Performance

Wiper Motor Supply

1

1

-

-

Switch Supply

2

2

-

-

Delay 1 Signal

2

3

4

-

Delay 2 Signal

2

3

4

-

Washer Pump Control

8

5, 6, 7

-

-

Switch Ground

-

7

-

-

Motor Ground

-

1

-

-

1. Wiper Motor Inoperative in All Modes
2. Wiper Motor Inoperative in Both Delay Modes

2007 Hummer H3

2007 ACCESSORIES & EQUIPMENT Wipers and Washers - H3