Hummer H3. Manual — part 1738

SYMPTOMS - WIPER/WASHER SYSTEMS

Visual/Physical Inspection

Inspect the washer fluid reservoir for the proper fluid level and condition.

Inspect the easily accessible or visible system components for obvious damage or conditions
which could cause the symptom.

Inspect for aftermarket devices which could affect the operation of the Windshield

Did you complete the repair?

Go to Step 12

-

9

1. Replace the ON/OFF WPR relay.

Refer to Relay Replacement
(Attached to Wire Harness) or
Relay Replacement (Within an
Electrical Center) .

2. Operate the vehicle within the

Conditions for Running the DTC.

Does the DTC reset?

Go to Step 11

Go to Step 12

10

Replace the body control module (BCM).
Refer to Control Module References
for replacement, setup and programming.
Did you complete the replacement?

Go to Step 12

-

11

Replace the underhood electrical center.
Refer to Underhood Electrical Center
or Junction Block Replacement .
Did you complete the replacement?

Go to Step 12

-

12

1. Use the scan tool in order to clear

the DTCs.

2. Operate the vehicle within the

Conditions For Running the DTC as
specified in the supporting text.

Does the DTC reset?

Go to Step 2

System OK

IMPORTANT: Review the system operation in order to familiarize yourself with

the system functions. Refer to Wiper/Washer System Description
and Operation.

2007 Hummer H3

2007 ACCESSORIES & EQUIPMENT Wipers and Washers - H3

Wiper/Washer System.

Intermittent

If the wipers operate at low speed for approximately 3 seconds and then stop, the wiper
motor park switch or its signal circuit, may be malfunctioning.

Faulty electrical connections or wiring may be the cause of intermittent conditions. Refer to
Testing for Intermittent Conditions and Poor Connections .

Symptom List

Refer to a symptom diagnostic procedure from the following list in order to diagnose the
symptom:

Windshield Wiper Washer System Malfunction

Rear Wiper Washer System Malfunction

WINDSHIELD WIPER WASHER SYSTEM MALFUNCTION

Diagnostic Fault Information

Windshield Wiper Washer System Malfunction

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

Switch Supply Voltage

1

1

-

-

Wiper Switch Signal 1

2

2

2

-

Wiper Switch Signal 2

1

3

4

-

Washer Pump Control

1

5

6

-

Wiper Relay Control

B3717

2

B3718

-

Wiper Motor Low Speed

1

2

-

-

Wiper Motor High Speed

1

3

4

-

Wiper Motor Park Switch
Signal

2

2

2

-

Wash Pump Ground

-

6

-

-

Wiper Relay Ground

-

1

-

-

Wiper Motor Ground

-

1

-

-

2007 Hummer H3

2007 ACCESSORIES & EQUIPMENT Wipers and Washers - H3

Circuit/System Description

Wash, Mist, Delay 1-5, Low and Park are all low speed wiper motor functions controlled by the
body control module (BCM). The BCM energizes the ON/OFF WPR relay in order to operate
the wiper motor at low speed. The high speed wiper function operates independent of the wiper
switch signal 1 circuit and any BCM output. During high speed wiper operation the wiper switch
signal 2 circuit directly energizes the HI/LOW WPR relay and energizes the ON/OFF WPR relay
through the wiper diode #90.

Diagnostic Aids

If the wiper motor runs at high speed during the low speed modes replace the wiper diode #90.

Reference Information

Schematic Reference

Wiper/Washer Schematics

Connector End View Reference

Wiper/Washer Connector End Views

Electrical Information Reference

Circuit Testing

Connector Repairs

Testing for Intermittent Conditions and Poor Connections

Wiring Repairs

Scan Tool Reference

Scan Tool Output Controls

Scan Tool Data List

1. Wipers Inoperative All Modes
2. Delay or Low Speed Wipers Inoperative
3. High Speed Wipers Inoperative
4. Wipers Always On
5. Washers Inoperative
6. Washers Always On

2007 Hummer H3

2007 ACCESSORIES & EQUIPMENT Wipers and Washers - H3

Scan Tool Data Definitions

Circuit Testing

Wipers Inoperative All Modes

1. Install a scan tool and display the Wiper Delay Input parameter in the BCM data list.

2. Ignition ON, the scan tool should display 0.5 to 3.0 volts in switch positions Mist, Delay 1-

5, Low and High.

If the scan tool displays 0.0 volts in the listed switch positions test the voltage supply
circuit to the windshield wiper washer switch for an open or short to ground or the
windshield wiper switch signal 2 and the washer pump control circuits for a short to
ground.

3. With the windshield wiper switch to the Low speed position the Front Wipers Active

parameter in the BCM inputs data list should display On for several seconds.

If the scan tool does not display On test the windshield wiper motor high and low
speed circuits for a short to ground. If the circuits test normal replace the ON/OFF
WPR relay.

4. Disconnect the windshield wiper motor connector.

5. Verify that a test lamp will illuminate when connected from battery voltage to the ground

circuit.

If the test lamp does not illuminate repair the windshield wiper motor ground circuit
for an open/high resistance.

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

Delay or Low Speed Wipers Inoperative

1. Install a scan tool and display the Wiper Delay Input parameter in the BCM data list.

2. Ignition ON, the scan tool should display 0.5 to 3.0 volts in switch positions Mist, Delay 1-

5, Low and High.

If the scan tool displays 0.0 volts in any of the listed switch positions test the
windshield wiper switch signal 1 circuit for an open or short to ground and perform
the windshield wiper washer switch low speed component test. If the circuit and
switch test normal replace the body control module.

3. With the wiper switch in the High speed position verify that the Front Wipers Active

parameter in the BCM Inputs data list is On.

If the scan tool does not display On test the wiper relay control circuit for an
open/high resistance. If the circuit tests normal replace the body control module.

2007 Hummer H3

2007 ACCESSORIES & EQUIPMENT Wipers and Washers - H3