Circuit/System Verification
WARNING: This page is about a different car, the 2009 GMC Sierra, 2009 GMC Cab & Chassis Sierra, 2009 Chevrolet Silverado, and 2009 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
- Observe the scan tool Windshield Wiper Switch parameter while rotating the wiper switch. The reading should change between Off, Intermittent, Low, and High.
- If the Windshield Wiper Switch parameter is incorrect in the Low or High switch positions, refer to the Multifunction Switch Circuit Test and/or the Turn Signal Multifunction Switch Test.
- Observe the scan tool BCM Wiper Park Switch parameter. The reading should display Active when the wipers are parked and Inactive with the wipers ON or out of the park position.
- If the Wiper Park Switch parameter is always Active or Inactive, refer to Wipers Do Not Park Circuit Test .
- Connect a test lamp between the TP 95 terminal in the underhood fuse block and ground.
- Verify the test lamp turns on and off while turning the windshield wiper switch between LOW and OFF.
- If the test lamp does not turn on and off while changing between the commanded states, refer to Wiper Control Relay Control Circuit Test .
- Ignition ON, operate the windshield wiper switch through the Delay, Low, and High positions.
- If the windshield wipers are inoperative in 1 or more of the delay settings only, test or replace the turn signal multifunction switch.
- If the windshield wipers operate at high speed while the switch is in the Low position, refer to Wiper Control Relay Control Circuit Test .
- If the windshield wipers operate at low speed while the switch is in the High position, refer to Wiper Speed Relay Control Circuit Test .
- If the windshield wipers are inoperative in the Low or High switch positions, refer to Wiper Motor Circuit Test and/or the Wiper Motor Circuit Test .