Question about 1999 GMC Jimmy

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Troubleshooting rear lock on 1999 GMC Envoy

I have a 1999 Jimmy with the Envoy package. The lift gate won't lock and the button release for the glass won't open the glass. There is power to the lock actuator. The obvious fuses are good. I can hear the relays clicking. Press the dash mount release button will open the glass, as will the key fob button. Do the two systems intersect? If so where?

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  • forquet May 10, 2010

    I have the inner panel off. I have taken the lock/latch mechinism out and inspected it. I can manually lock and unlock the latch by moving the the lock tab. The lock will not respond to the key fob or the electric lock switch on any of the doors.

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There are some mechanical rods in the rear hatch that are probably rusty and you will have to take the inner panel off to acces and clean them to get them moving to operate the lock.

Posted on May 09, 2010

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This solution applies to models:
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2004-2007 Buick Rainier
2002-2007 GMC Envoy, Envoy XL, and Envoy Denali
2002-2004 Oldsmobile Bravada
2005-2007 Saab 9-7x

Condition/Concern:
Rear liftgate glass will not lock when using the key fob or door switch unless the lock button is pressed a second time. All other doors will lock normally. This could be the result of the liftgate glass lock rod not adjusted correctly. This lock rod travels from the liftgate lock actuator to the glass release push-button cylinder.

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Remove the inside rear liftgate trim panel. Disconnect the threaded lock rod clip at the end of the push-button glass release and rotate this clip 1 complete turn at a time making the lock rod longer. This will be the only threaded lock rod visible when the trim panel is removed and the liftgate is raised.
Note: For the rear glass to release, the rear liftgate latch must be in the closed position. For test purposes only, this latch can be made closed to make this lock rod adjustment.

Please follow this diagnostic or repair process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed.

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