Diagnostic Aids
WARNING: This page is about a different car, the 2007 Hummer H2. However, it is still accessible from the selected car via links, so may be relevant.
If the initialization has not been completed the rear window defog function will not operate and the midgate will unlatch while the glass is in any position. One touch express up and down will be disabled so the window can only be operated in a supervised mode and the anti-pinch feature will not function.
False glass reversal may be due to the system load having changed since the last initialization. The problem may by corrected by performing the de-initialization then an initialization procedure.