1999 Windstar: Electric door locks fail to lock/unlock, all doors
Whether actuated from the key fob or from the doot panels, all of the door locks work only intermittently. The motors are being engaged and the locks "jump" but may not move all the way up or down. The locks move wll by hand, there is power at the both the door switches (1.04 volts) and at the motors (which spike at 13v. when actuated and then drop off -as I assume they should).
Since it happens to all doors, I wonder if it could be in the Passenger Compartment Electronics module on the inside fire wall behind the brake pedal. How can this unit's operation be checked? What kind of voltage should be at the door switches? (1.04 v. seems low to me even for a relay.)
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test for power and ground at the non-working actuators. If they're getting power and ground when you activate the door locks, the actuators are bad. Keep in mind that they all work the same number of cycles, so it's no unusual for multiple actuators to fail at the same time.
one of the door lock actuators is probably not working right. the door lock actuator is responsible for sending the correct signal to the door lock/unlock module to tell the module if/when a door is locked or unlocked
if the key wont unlock the door and the fob does then the linkage from the lock to the key has come apart, as the fob is actuating the electric motor , will need to strip out door panel to see where the connecting rod has got to
May be switch but could also be bound up linkage &/or door lock actuator. Pull interior door panel & lube up all rods, linkage & actuator with a good penetrating oil. Then watch linkage & actuator as you lock & unlock door.
Sounds like body computer is malfunctioning or the module that controls the door locks lost it's program.Disconnect the battery for few minutes then reconnect and check.In some cases this resets the system computer and all starts working.But if that does not helps then problem has to be checked with the power door lock system.Either a power door lock actuator or the power door lock switch.
Usually the most common problems with power door locks are the actuators. They are small electric motors used to lock and unlock the car doors when activated by a switch or remote. Like any electric motor sooner or later it will fail. Replacing an actuator involves removing the interior door panel for access. Some are part of the door latch and some are independent. Either way, door lock actuators need to be replaced if they are buzzing, working only in one mode or are not working at all. if the problem is with the door lock actuator or just the switch. If a All the door locks, only work when locking and NONE of them work to unlock, then the switch is most likely the cause.
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The door lock actuators or 'solenoids' have failed. This seems to be pretty common on Windstars - I've just replaced a couple on my '02. (Ironically, the original batteries in the remote fobs are still going strong, they lasted longer than the actuators). You can buy third party replacement parts, the front door ones are 'handed' driver & passenger, but a common part will work for both sliding doors. I don't have instructions for removing the door panels, but search online - it's not tricky. The original actuators are riveted in place - you'll need to drill out these rivets. The new actuator can be held in place with a nut, bolt & couple of washers. Replacing these parts isn't too difficult - the first one took me about 1.5 hours, but once I knew what I was doing, the second one took about 0.5 hours. Good luck.
I just bought a 1999 Suburban and all of the door lock actuators were bad including the rear (barn style door) while I was replacing the rear door acuator I noticed that even with the factory mounting bracket on the actuator it was causing the door lock rod (the rod from the keyed cylinder lock to the actuator) was on a bind......the solution I came up with is adding an additional 3/4" spacer between the factory mount bracket and the door attach point. this solved any binding and the door lock works great now........also I used a lubricant on all the doors where the rods run through the plastic guides, which seemed to help quite a bit! Hope this help's.
The door locking mechanism and actuators are the most likely issue here. Very unliekly that the key fob is the problem. not sure about he problem with the drivers door lock, could be dirty, damaged or not the original that matches the key. have you tried graphite?
This can be caused by the actuators in the lock mechanism
failing usually causing the door to remain locked. The boor door can
also fail this way, though sometimes the catch sticks (pry off the LR badge, squirt with WD40 and work it a few times to fix that). Replacement requires the
whole lock unit to be replaced at a cost of roughly £60 a lock, and a
hours work. Helps if you have small hands. It does require a complete strip down of the door, and will need the lock unit, trim panel clips, and a trim removal tool. Clips are a few quid, the tool's usually around a tenner.