2003 yukon 2rear doors and tailgate door wont lock manually or remotely if i tap on lock relay in fuse panel the doors will lock once and then no more, i replaced relay didnt help

There are several potential causes for this issue in a 2003 Yukon XL 1500 slt. It is possible that there is a problem with the door lock actuators, the wiring, or the control module. It is also possible that there is a problem with the key fob or the door lock switch itself. In order to determine the exact cause of the problem, I would recommend taking the vehicle to a qualified mechanic or dealership for further diagnosis and repair. They will be able to diagnose the issue and determine the best course of action to fix it.

Central lock problem, rear door and trunk don´t open - Xoutpost.com

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Aug 23, 2014 - 10 posts - ‎4 authors
I have a problem on my X5, the remote key can only open the front ... I´m in a distante country without any BMW representative, but I can ... Remote keys can only lock andunlock the front doors, the rear door locks does not respond. .... the front doors openit won't unlock or lock the rear doors and rear trunk. Door Won't Lock With Key
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BMW X5 xDrive 30i automatic tailgate does not w

Check the wiring to the rear hatch. The cables break and cause a variety fo problems like yours. You will have to take the plastic cover off and expose the cables.

change the batteries in the remotes

Lubricate all servos ,, use button inside car a few times , replace batery on FOB .

see if it has child proof locks????

You need to replace the Unlock Relay, it should be in the fuse panel on the passanger side.

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?

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.