Circuit/System Verification

WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2008 GMC Yukon XL, 2008 GMC Yukon, 2008 Chevrolet Tahoe, 2008 Chevrolet Suburban, and 2008 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.

Ignition ON, command the rear window wiper ON and OFF by using the rear wiper switch. The rear window wiper should turn ON and OFF when changing between commanded states.
- If the rear window wiper does not turn ON and OFF, refer to Rear Wiper System Malfunction
Observe the scan tool Ext. Trunk/Liftglass Rel. Sw parameter while pressing the liftgate window release switch. The parameter should change from Inactive to active.
- If the parameter does not change, refer to Liftglass Release Switch Malfunction .
Command the liftglass latch to release the liftglass by pressing the liftgate window release switch. The liftglass latch should release the liftglass.
- If the liftglass latch does not release the liftglass, refer to Liftglass Latch Assembly Malfunction .