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New to forum, I purchased a 2000 denali with 160k and runs great, looks nice. My problem is the door locks driver and front passenger lock and unlock with door button and remote one time then it doesn't. You can hear the switch and the lock lever moving slightly but doesn't move enough to unlock or lock completely. Just wondering where to start. Thank you.
 

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If you take the door panel off, look to see if the pop rivets holding the door lock actuator are tight. Overtime these get loose and have enough play in them to not allow the actuator to move the lock enough to work.
 
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