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