I assume you mean that the central locking system will not lock the doors but you can do so manually.
Get inside the vehicle and close all doors.
On each rear door, lock and unlock the mechanism manually a couple of times. In other words do not use the key pad.
Then leave both rear doors in the locked position (manual locking) and operate the lock button on you key pad to operate the central locking system. Wait a few seconds then hit unlock on your key pad and a few seconds later hit lock on your key pad.
If the system fails to lock your rear doors you will need to get the vehicle to an auto electrician to check out the issue and rectify it for you. There are a number of possible causes which cannot be identified without physically checking the system. So you will need to have this rectified by a professional.
SOURCE: Rear Door will not Lock
Happened to me. Remove the door trim, WD40 the latching system and work it back and forth, you will be able to see were it gets hung up.
SOURCE: 2000 Safari, power locks,Rear dutch door wont unlock,
can you use the key its self on the rear door. what i mean is not using the remote but actually using the key?
SOURCE: passenger rear door only locks and unlocks manually
the door lock actuators failing are a very common problem on the NF sonatas.
they are covered under 5/60
SOURCE: power locks for rear doors and hatch not unlocking
you have two relays on the interior fuse block one for locking and one for unlocking. Swap them and see if the problem is now such that they will not lock. If so you have your answer.
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The passenger door switch (PDS)
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The body control module (BCM)
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The driver information center (DIC)
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The rear door lock/unlock relay (LBEC)
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The door lock actuators in each of the doors
The rear passenger doors are controlled by the BCM through the rear door lock/unlock relay which is incorporated onto the printed circuit board in the LH BEC. The BCM controls the unlock relay by providing ground to energize the coil and controls the lock relay by providing battery voltage to energize the relay coil. The energized the relay and allows voltage to be applied to either the door lock motor lock or unlock circuits. Since the other side of the door lock actuator is connected to the normally closed contacts of the opposing relay to ground, the doors lock or unlock.
Do you know what the BCM is , body control module ! If you do not know about this stuff I strongly suggest you to it to a ASE certified repair facility ! Save yourself some money an aggravation !
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