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wiring connections or lock latch frozen --to manually bypass latch or to unlock rear hatch -- in the bottom of door panel is a round access hole remove cover just clipped into place using a flashlight and a screw driver about 3 inches in on bottom is the lock latch and window lock latch connections if u pull back on the inner latch u will unlock the hatch which will allow u to open it[ when opened check the wiring connections for corrosion or damage if good ] now u can remove the whole hatch panel and check the latches and actuator the actuator and latches,and rod clips sometimes need to be lubed or sometimes the clips break or disconnect clips can be purchased at any auto store panel is clipped into place carefully pry from a corner and using a screw driver or panel tool pry straight back till panel clip pops replacement of panel put clips in place and push in panel
Could be the latch mechanism for the door is sticking. You could try using some white grease on the latch and the contact where the latch hooks to. You can purchase the grease from most auto parts stores. You will not need to use alot. Just apply a small amount to the mechanisim and then work it in using the manual handle. Then open and close the door several times to feel the "action". Then apply a little more and repeat. This should loosen the latch and get it working again. Also make sure that none of the tension springs have come loose on the latch. And check the seal around the door and make sure it is not pinched and has a proper fit.
have you had someone try the unlock while you listen at the hatch to see if you hear the solenoid working?
My guess is your going to have to remove the rear hatch panel to gain access
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.
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.
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?
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