Circuit/System Verification
WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2007 GMC Yukon XL, 2007 GMC Yukon, 2007 Chevrolet Tahoe, 2007 Chevrolet Suburban, and 2007 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.
BCM and Wiper Switch Verification
- Ignition ON, observe the scan tool BCM Windshield Wiper Switch parameter. The reading should display Off, Intermittent, Low and High while rotating the wiper switch.
- If one or more of the wiper delay parameters are inoperative and the wiper low speed parameter functions, replace the turn signal/multifunction switch.
- If the low speed and/or high speed parameters are inoperative, perform the Multifunction Switch Circuit/System Testing and/or the Multifunction Switch Component 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, perform the Wipers do not Park Circuit/System Testing.
- If all wiper position parameters displayed correctly on the scan tool, perform the Wiper Motor Circuit/System Testing and/or the Wiper Motor Component Test
BCM and Wiper Motor Verification
- Command the windshield wiper motor to the off, low speed and high speed modes with a scan tool. The wipers should perform the commanded state.
- If one or more of the commanded states do not work, perform the Wiper Motor tests in Circuit/System Testing and/or Component test.
- If all the wiper motor speeds function, perform the Multifunction Switch Circuit/System Testing and/or the Multifunction Switch Component Test.