Chevrolet Repair Questions? Ask a Chevy Mechanic for Answers ASAP
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Is this issue only occuring with one rear door and which door is it on your model here?
Is it acting up both with locking and unlocking with the remote and the interior lock and unlock buttons?
Let me know so we can continue,thanks Pete.
When you try to lock or unlock them if you grasp the lock knob at the top of the door do you feel any movement at all?
Do you hear any clicking noises inside the door at all when trying to operate them?
O.k.,first step.In your instrument panel fuse block locate the UNLCK 1 and LCK 1 (15 amp) fuses and make sure they are both o.k.If these are o.k. if you have a test light or multi meter test for power on these fuses when locking and unlocking the doors electronically.If you have no power across these fuses what fails is the Lock/Unlock PCB relay in most all cases.This unfortunately is a relay that is integrated into this fuse panel itself and cannot be replaced separately as it has to be replaced as a complete assembly with the instrument panel fuse block.The door locks can start to fail one at a time like this here as this relay controls these circuits individually.It is more of a control module/relay since it has so many different functions built into it.
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