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Re: My tailgate on my envoy will not open or unlock
Check for any blown fuses first. Inspect the harness that goes to the tailgate for damage. Outside of that it will involve tracing wires using a wiring diagram.
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check the fuse/relay. if it is neither of these check the switch with a multimeter. If you can hear the motor trying to move the glass when you try the switch it may be the regulator needs attention. It may be the motor needs to be replaced.
check fuse and relay along with the switch first then the regulator and motor afterwards. Replacing the small electronics is obviously easier than having to open up the tailgate to check the mechanics of the winedow.
pull the plastic off of the tailgate and make sure the small wire looking controls are still hooked up. sometimes they will pop out after alot of use. other thing is make sure the rear actuator is actually working (it could be bad)
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