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There are two fuses associated with the door locks system. The first is the Cigarette Lighter Fuse (Fuse 13 - 20A). This fuse provides power to the switches to activate the lock/motor relays. The second fuse is the PWR ACCY Circuit Breaker (30A). This provides the power thru the relay contacts to the lock solenoids/door motor. Both of the are in the Instrument Panel (IP) Fuse block.
DISCONNECT YOUR DRIVE SHAFT FROM THE REAREND THEN TURN YOUR REAR BY HAND AND IF YOU STILL HEAR CLICKING OR GRINDING
DETERMINE FROM SIDE OR MIDDLE. IF NOT BRAKES THEN REAREND BEARINGS. THESE REARS WERE FAMOUS FOR REAR BEARINGS.
AFTER REPAIR INSTALL SYNTHETIC FLUIDS.
probly got a bad silonode change that out for a new one should work bad part probly going to have a dif key for it though but the button should work :]
This may be a Body Control Module (AKA, BCM) issue, this module controls these functions, wsaw this same issue on a Buick, it was the BCM, you will have to have an active system tester with live data stream cycle the locks to see what the problem is, as far as I know the dealer is the only place that has this type of dedicated test gear.
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