Re: Rear doors and tailgate will not lock with remote or...
Harris, did you find a solution to your problem? I am having the same issue on my 04 denali. Rear doors and tailgate wont lock but the unlock fine. Front door function normally? let me know.
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Either the lock soleniod is bad or the linkage has come off. They use plastic clips to hold the linkage in place and they get briddle over time. Your going to have to gain access to the inside of the tailgate to diagnose the real problem.
Check the unlock mechanism for the hatch. These are controlled by an electrical motor pulling a cable. If the cable came loose you might or might not hear the click click that it makes. I would also check the fuses and relays related to the system. Usually if you can get the interior panel off all the innards are exposed. I would suggest pulling that panel off, then triggering the keyless remote and see if anything moves, that might pinpoint where it has gone bad.
The lock is stuck in the "locked" position.
When you close the hatch, it is jamming the latch hook into the wrong area.
Manually open the hatch. Unlock the hatch (even tho the hatch is already open). there are two bolts holding the metal "loop", the loop has moved. Adjust the metal loop and close the hatch / lock it, etc.
Either the relay for the locks is bad or the fuse. When you push the power lock on the inside if the doors do not unlock then I would check the fuses, both inside and under the hood. If they do work then the relay/s may be bad. You are pushing your key button twice correct?
I fixed mine by using fine steel wool to clean the brass contacts located at the right upper door frame on the right door as viewed from the rear of the vechicle.
Remove the fuse panel on the driver side and find the door lock relays remove and replace the relays. Make sure they are seated in the fuse panel. That should fix the problem.
make sure than you have not split any fluids on the passenger front door most of the times is where the module to control the windows and doors is located, try by unpluging the batterie and the after a minute plug it back and see what happend but if any of your ft doors have been split with liquid or rain has gone inside then most likelly the module got moisture and not working
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