I realize this is a very old thread, but I've searched for newer or more relevant posts and didn't find any. So, as a new person to the C4VR, I'd like to share a frustrating experience I just resolved. It wasn't electrical, but absolutely prevented my rear hatch glass from opening. I have a 1991 ZR1 and yesterday the hatch was sticking after the release button was pressed and the servo popped the latch. After exploring what I could, I ran a thin plastic squeegee around the hatch, between the glass and seal, thinking it might have been stuck someplace and holding the glass down...nope. Then, checking the forums and YouTube, I realized that it seemed the latch was not fully releasing. I went back to the car and tried 3-4 times to close/release and watch the action. What I noticed was that the striker was catching on the plastic cover that sits over the retractable security cover. Carefully, I pryed up on the glass with my fingers and it cleared the plastic cover. What I found was the plastic 'guard' (probably to inhibit rattling) was worn and distorted to the point that a piece of it had split and buckled, which was catching firmly enough on the plastic panel that it would prevent the lift shocks from opening the glass any further. Thoroughly annoying but easily fixed. For now I just took a razor blade and trimmed off the back part of the 'guard' and will simply replace the whole piece. Hope this helps someone else with no mechanical or electrical issues...just a good ol' piece of worn plastic. (Edit: I realize the image is for the "vent" add-on for the striker, but it does help illustrate the issue.)