Hummer H3. Manual — part 1750

diode.

Park Position Operation

Windshield wiper motor park operation is controlled by the body control module (BCM) using
an input from the park switch within the wiper motor assembly. The BCM monitors the
windshield wiper motor park switch circuit to determine if the windshield wiper blades are at the
bottom of the glass. The circuit will be pulled to ground by the wiper motor park switch while
the windshield wiper motor is operating. When the wiper switch is turned to the OFF position
while the wiper motor is somewhere in mid-cycle, the BCM will continue to operate the motor
until the wipers reach the park position. If the ignition is turned OFF while the wipers are in mid-
cycle, the wipers will stop immediately where they are. The BCM will park the wipers the next
time the ignition is turned ON.

The wipers will not park when they are commanded ON and OFF with a scan tool. The BCM
will park the wipers the next time the wiper switch is turned ON and OFF.

The BCM provides stall protection for the wiper motor by monitoring the park switch. If the park
switch does not transition for 3 seconds while the wipers are operating, the BCM will assume that
the wiper motor is stalled and will de-energize the wiper relay until the wiper switch is cycled
OFF and ON again.

Windshield Wiper/Washer System Power and Ground

With the ignition in the ON position, accessory voltage is supplied through the WIP/WASH 10A
fuse in the underhood fuse block to the wiper/washer switch. Refer to Wiper/Washer
Schematics.

G101 provides ground for the following:

Windshield washer pump

Windshield wiper motor

Wiper micro relay

Wiper 2 relay

Diagnostic Trouble Codes (DTCs)

The body control module (BCM) monitors the voltage on the windshield wiper switch signal 2
circuit for diagnostic purposes. If the circuit is shorted to voltage while the driver is commanded
OFF, the BCM will store DTC B3717. If the circuit is shorted to ground while the driver is
commanded ON, the BCM will store DTC B3718.

2007 Hummer H3

2007 ACCESSORIES & EQUIPMENT Wipers and Washers - H3

REAR WIPER/WASHER SYSTEM DESCRIPTION AND OPERATION

Rear Wiper/Washer System Components

The rear wiper/washer system consists of the following components:

Rear wiper/washer switch

Rear wiper motor

Rear washer pump

RR Wiper 15A fuse

RR Washer Pump 15A fuse

Rear Wiper/Washer System Description

The rear wiper motor module is part of the rear wiper motor assembly and controls wiper motor
operation. System voltage is supplied to the switch, washer pump and wiper motor by two
retained accessory power circuits. The washer switch controls the washer pump by providing a
path to ground when pressed. The rear washer control circuit is also used as a wash signal to the
rear wiper motor module. The WASH command on the washer control circuit will cause the
wiper motor to operate at low speed for as long as the switch is held in the closed position and 2
cycles after being released.

SPECIAL TOOLS AND EQUIPMENT

SPECIAL TOOLS

Special Tools

Illustration

Tool Number/Description

J 39232

Wiper Linkage Separator

J 39529

2007 Hummer H3

2007 ACCESSORIES & EQUIPMENT Wipers and Washers - H3

Wiper Linkage Installer

2007 Hummer H3

2007 ACCESSORIES & EQUIPMENT Wipers and Washers - H3

2007 Hummer H3

2007 SYSTEM WIRING DIAGRAMS Hummer - H3