Door Locks locking by themselves-Problem Solved November 27, 2010, 06:32:38 PM My door locks on my 88 thunderbird keep trying to lock by themselves. The door locks themselves don't even move up and down, but I can hear the actuators trying to engage by themselves. Is there some kind of a computer which controls them? I tried disconnecting the battery to no avail. If I try to lock the doors, it does the same thing, the door locks don't move but you can hear the actuators trying to move, happens on both doors. Quote Selected
Door Locks locking by themselves-Problem Solved Reply #1 – November 27, 2010, 06:50:51 PM you need to tear into it to see what is wrong. All you have to do is pull off the door panel and then watch. Quote Selected
Door Locks locking by themselves-Problem Solved Reply #2 – November 27, 2010, 11:15:13 PM Door lock and unlock relays are under the passenger seat. Might want to check them.Also it's possible that one of the switches on the doors is stuck and just keeps them in a cycle.Disconnecting one of the above should yield some result and you can troubleshoot from there.Do you have keyless entry? Quote Selected
Door Locks locking by themselves-Problem Solved Reply #3 – November 28, 2010, 11:59:16 AM This happened to me in my Mark. Turned out to be one of the pins pulled out of the connector behind the door panel and was grounding itself out on the door. Probably a longshot for you, but I think it would be worth checking. Quote Selected
Door Locks locking by themselves-Problem Solved Reply #4 – November 28, 2010, 01:52:09 PM Its gotta be a relay,, could be one of the two door switches as well.diagram available if you want. Quote Selected
Door Locks locking by themselves-Problem Solved Reply #5 – November 28, 2010, 06:16:01 PM I seem to recall from previous threads that the 88's don't have the relays under the passenger seat. So if you don't find them there, they are under the center of the dash, I think.Eric asked if you have keyless entry. This is important because with this feature, you don't have relays. The actuators are controlled by the keyless entry module.The actuator motors have built-in circuit breakers. With continuous power to the actuator the breaker will heat up and open the circuit. Then it will cool off and put the power back on the actuator. I'm guessing you are hearing them cycling like that.What happens when you try to unlock the doors? Quote Selected
Door Locks locking by themselves-Problem Solved Reply #6 – November 28, 2010, 10:10:11 PM I don't have keyless entry. The problem stopped, it is bizarre. I had the battery unplugged for a long time, reconnected it and they stopped. I will take the door panels off and check for the pins grounding. The door buttons are not stuck, pushing them did not affect the problem. It's possible it is one of the relays, I will have to remove the passenger seat to check. Quote Selected
Door Locks locking by themselves-Problem Solved Reply #7 – November 29, 2010, 12:44:15 PM Or, loosen the rear nuts, then remove the two front bolts so you can tilt the seat back.My point was just like what soft touch was saying, your lock solenoids are constantly getting power so the internal circuit breaker is heating up and cooling off thus constantly adding and removing power.Its gotta be a stuck relay or dirty contact on a switch somewhere. Quote Selected
Door Locks locking by themselves-Problem Solved Reply #8 – November 29, 2010, 01:08:03 PM Jcassity, If I hold the lock or unlock button, it only activated the locks once, holding the button does not leave the circuit open, its seems to be a momentary thing. <-- Does that make sense? But your thinking it has to be a stuck or dirty contact on the door switch itself, correct? Quote Selected
Door Locks locking by themselves-Problem Solved Reply #9 – November 29, 2010, 01:37:40 PM holding a door lock button closes or allows power flow.something is stuck closed,, be it a relay or dirty / worn contacts somewhere.it would not be a first to have a relay contact welded closed. If the relay were arch welded in the closed position, then it probably is warm to the touch.my first guess is like everyone said as well, get the door panel off and watch what happens.who knows, you might find your wire harness is jacked up because your window up and down movement has rubbed a wire.check out the evtm as well or the diy links in misc tech. i think i have door locks posted there.get a test light or rig one up and poke around. you should not have any power going to the solenoids although we already know you must. the only time they do stuff is when the lock/unlock button is pushed. Quote Selected
Door Locks locking by themselves-Problem Solved Reply #10 – December 05, 2010, 02:49:02 PM Well apparently while I was at school again the problem happened. I do have a remote starter/door unlock. It may be the problem. I'm not sure. I removed the solenoids from underneath the seat, they look to be okay. The pins aren't discolored or anything. I will remove the door panel next weekend, I don't have time today. I'lll get a test light and look to see what I can find. IF anyone else has anything, feel free to chime in. Quote Selected
Door Locks locking by themselves-Problem Solved Reply #11 – December 05, 2010, 03:16:52 PM Update.. Unplugging one of the relays under the seat eliminates the problem. The relay itself looks okay, but when it's re plugged in the doors looks start working. Seeing I locked the car when I left, and it was unlocked when I came home, I think it's safe to say the unlock switch is the one in question. Now does this mean the actuator is bad, or could this still be the switch?On the two actuators, there is one closest to the drivers side, one closest to the passenger side. If the one closest to the driver is plugged in the doors start trying to unlock themselves, over and over again. The one of the passenger side can be plugged in and nothing happens. Nothing happens if the drivers side closest one is plugged in by itself. I'm making an assumption that they both have to be plugged in, in order to work, is this correct? If I try to lock the doors with both of them plugged in, nothing happens, is this because the unlock circuit is somehow open, and only one can be open at a time, or does it mean the problem is in the lock part, which is causing the unlock to malfuncion. I'm trying to understand how the system works, hoping that'll allow me to figure out the problem, i gues.I know I have to take a door panel off and try to figure out whats happening. I'm assuming it's going to be on the drivers door, as that's the one that was taken off most recently. I thought the above paragraph might narrow it down a little to maybe and electrical guru here. Quote Selected
Door Locks locking by themselves-Problem Solved Reply #12 – December 05, 2010, 03:33:08 PM I *think* (and a good possibility I may be wrong - so somebody correct me ) but if the door locks are moving then I think the actuators are good. Quote Selected
Door Locks locking by themselves-Problem Solved Reply #13 – December 05, 2010, 06:05:32 PM Your thread started with the locks locking problem. Now they are unlocking?Yes both relays need to be plugged in for it to work.Yes if the actuator motors in the door move the locks they are good.The actuators are little electric motors. They run in one direction to lock and in the opposite direction to unlock.When neither of the relays is picked (operated) they apply ground to both sides of the motors. When one of the relays is picked it applies voltage to one side of the motors while the relay that is not picked applies the ground to the other side of the motors. One of the relays is picked to lock and the other relay is picked to unlock.The lock control switches apply ground to one or the other or neither of the relays.A bad switch or one the wires from the switches being grounded can keep one of the relays picked.Is the remote start/door unlock a standard feature or aftermarket?Do you have any documentation for it? Quote Selected
Door Locks locking by themselves-Problem Solved Reply #14 – December 05, 2010, 06:32:14 PM Quote from: softtouch;344571Your thread started with the locks locking problem. Now they are unlocking?Yes both relays need to be plugged in for it to work.Yes if the actuator motors in the door move the locks they are good.The actuators are little electric motors. They run in one direction to lock and in the opposite direction to unlock.When neither of the relays is picked (operated) they apply ground to both sides of the motors. When one of the relays is picked it applies voltage to one side of the motors while the relay that is not picked applies the ground to the other side of the motors. One of the relays is picked to lock and the other relay is picked to unlock.Is the remote start/door unlock a standard feature or aftermarket?Do you have any documentation for it? Yes, I originally thought they were unlocked trying to lock but they are actually trying to unlock. Good to know about the both actuators needed to work. I unplugged one, and left the car. I will look into the grounded wire, the locks keep trying to cycle, its not immediate, but it is like every 10 or 15 seconds. The remote starter is an aftermarket one, I have an electronic owners manual for it I just downloaded form the company website. It may likely be either of the 3 possibilities, a bad relay, a bad/grounded out wire, or a bad switch. How can one test or see if it is the relay without changing it. I have plenty of switches I can swap in and out to test. Quote Selected
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Topic: Door Locks locking by themselves-Problem Solved (Read 3380 times)
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