Power Door Locks Not Working – Diagnose and RepairJuly 4, 2009 10:02 am Consumer, DIY
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Question – I have a 2004 Jeep Grand Cherokee and the right rear door lock makes a loud buzzing sound when I try to unlock the door. Can you suggest what the problem could be?
Answer – This is a common symptom of an actuator that has gone bad. It could be the gears inside that are worn not meshing properly, although the exact cause of failure doesn’t really matter since the part is replaced as a unit and not taken apart and repaired.
Question– After replacing an exterior door handle on my Mercury Mountaineer, the door locks will not work properly. The locks worked before, what could be the problem?
Answer – Since the door locks worked before the door handle was replaced, the problem most likely is the link adjustment from the handle to the door lock actuator. If the adjustment is too tight or too loose, it will not work properly. A little free movement of the handle should be felt if the adjustment is correct. It’s best to notice where the positioning is on the threaded part of the rod prior to taking it apart, then check the door lock operation before putting the interior door panel back on.
Question – On my 2003 Ford Explorer, the power door locks go on and off while driving down the road. The door ajar warning comes on the dash and chimes, what could be the problem?
Answer – It’s possible that one of the door ajar switches located in a door latch could be going bad. Another possibility is a wire that goes from the door through the body could be shorting sometimes (see the picture at the top). The Explorer uses a security module located underneath the right rear quarter window behind the trim panel – I’ve heard of cases when the window is not closed, rain can enter and ruin the module causing strange problems due to the water shorting it.
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