Question about 1999 Cadillac DeVille

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Doors locks what are some things that can cause the door locks to unlock at some point? We think its not the battery cause we can get in and start it right up. We though a few days ago that maybe we forgot to but then we locked it yesterday and today it was unlocked again.

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  • chisel79 Jul 07, 2008

    what would that do as for unlocking the car? We were out of town all day so the keypad was no where a round the car to unlock it. Plus we used the door lock on the car and they are not sticking.

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You need to change the batterys in your key pads if you have them or a sticking button on your key pads the unlock button

Posted on Jul 07, 2008

  • B J WILSON Jul 07, 2008

    the sensor for the door lock it is called an actuatior that controll all the locks some thing like this that is what your problm is

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What causes auto locks to go off by themselves constantly. What causes auto locks to go off by themselves constantly


Many newer vehicles use a voltage-differential method of locking/unlocking the doors. This uses a resistor to create the voltage difference between lock and unlock commands depending upon which way you toggle the lock switch. They do this so that if the car battery starts to fail, and the voltage drops to a certain point, the doors will unlock automatically rather than staying locked, allowing you from entry if the battery dies (seeing as some newer cars do not have key-type door locks anymore). The problem could be that your charging system is not putting out the proper voltage or you could have a faulty lock switch or resistor.

Sep 22, 2015 | Cars & Trucks

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What causes a malfunction in power locks?


The power door locks are controlled by the BCM -body control module ! The door lock switch is an input to the BCM .
The BCM, upon receipt of a door lock switch lock or unlock signal, will switch the appropriate door lock actuator control circuits to battery positive voltage. The opposing side of the door lock actuators are connected to ground internally within the BCM through the other door lock actuator control circuit and the doors will lock or unlock appropriately.
First thing to do would be check power an ground circuits at the BCM ! Do you have any other systems not working -power windows etc...
The DR/LCK fuse supplies battery positive voltage to the I/P fuse block for the door lock system. The body control module (BCM) supplies and monitors a reference voltage to the door lock switch through the door lock switch lock/unlock signal circuit. The door lock switch also receives a constant ground source. If a door lock switch is placed in the lock position or unlock position, the reference voltage is taken directly to ground and the BCM detects the voltage drop on the signal circuit.
Should have BCM checked for stored DTC'S - diagnostic trouble codes !
Ignition ON, observe the scan tool Driver Door Lock Sw, Psgr Door Lock Sw, Driver Door Unlock Sw and Psgr Door Unlock Sw parameters while using the driver and passenger door lock switches. The parameters should change between Active and Inactive.
?‡'
If the values does not change between the commanded states, refer to Door Lock Switch Malfunction.

Command the driver door and passenger door lock actuators to LOCK and UNLOCK with the scan tool, the doors should LOCK and UNLOCK when changing between commanded states.
?‡'
If a door lock actuator does not perform the LOCK and UNLOCK functions, refer to Door Lock Malfunction


DTC B3130 00: All Door Unlock Circuit

DTC B3135 00: All Door Lock Circuit

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1 Answer

An 08 prius keyless entry doesn't work, changed the batteries, pushed the disable button and reset it, still no go. Any ideas?


1. Start with the key out of the ignition, drivers door is open all others closed and
drivers door is unlocked.
2. Perform these steps within 5 seconds.
A. Insert the key into the ignition and Pull key out twice (Do NOT Turn)


3. Perform these steps within 40 seconds.
A. Close then open the drivers door twice.
B. Insert the key into the ignition(Do NOT Turn) Pull key out.
4. Perform these steps within 40 seconds.
A. Close then open the drivers door twice.
B. Insert the key into ignition and leave it in ignition.
C. Close the drivers door.
D. Turn the ignition to ON (Do NOT Start) then back to OFF.
E. Remove the key from the ignition.
5. Within 3 seconds, the power door locks should lock then unlock automatically
indicating successful entry into programming mode.
Return to step 1 if the locks do not cycle at this point.
6. Perform these steps within 40 seconds.
A. Press the lock and unlock buttons on the remtoe simutaneously for 1.5 seconds.
B. Immediately after letting go of the lock and unlock buttons,
Press the lock button by itself and hold for 2 seconds. Within 3 seconds, the door
locks should lock and then unlock once indicating successful programming. If
the door locks cycle twice, repeat steps A and B in step 6 as the remote was
not accepted.
C. Repeat steps A and B in step 6 for each new remote.
7. Open drivers door.

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1 Answer

1994 lexus es 300 starting issue / alarm reset?


I think that's the alarm system as well.the most important thing is the alarm system is still working?step out yr car try to use remote key to lock n unlocked,if that's working.i don't worry at all.lock n unlock are alarm system reset itself.should be normal,battery is super low or dead .good luck for u

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1 Answer

1998 safari rear door lock / power locks


This problem can be caused by a few things, it could be the rear door lock switch or lock module located under the dash or last the rear door actuator.

You say that all door lock and unlock on there on, this tells me it most likely has a module problem or wiring to the rear door is bad.
The first thing i would do would be to remove the rear door panels and check wiring to switches and actuator, then follow wiring from inside the rear hatch to where in goes through the body. the wiring most times breaks at that point where the wiring is bent over from opening and closing rear door ,

Locate the wiring going into door or doors. sometimes the wiring only goes into one door but then sometimes in goes into both doors, check the wiring closely . it may be covered in a rubber boot . if it is covered you will need to slide boot back to check wiring.

Good day. hope this is helpful.

Sep 03, 2012 | 1998 GMC Safari

1 Answer

2004 E320 FOB replaced battery doors will still not lock/unlock


have you re programed it there is a system for each car my friend had to go to main dealer to get his focus pad sorted

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1 Answer

Random door locking


theres 1 thing I can think of, if you put your key in the door 2 unlock it and hold the key 2 the unlock position for a few seconds all the doors should unlock, well the electronics inside the door panel that control that is probably bad or shorting out causing the doors to lock . You can also hold the key 2 the lock position for a few seconds and lock all the doors

Dec 08, 2011 | Cadillac Cars & Trucks

1 Answer

Used the key to unlock door and alarm started going off. put key in ignition to start, but wouldn't. removed battery cable, do to neighbors, and the alarm keeps sounding. how can I shut it off? just...


With the drivers window down, and the doors closed. and locked connect the battery and lock and unlock the tailgate with the key, you need to unlock it twice to unlock the doors and turn off the alarm. If the locks are working like thier supposed to the drivers door will be unlocked and opening it won't set off the alarm. the truck should be back to normal. If not disconnect the battery again. Drivers window down. Put the key in the switch and turn the key on to the run position. With all the doors closed connect the battery. connect it good and don't bounce it around. If the battery casbles aren't clean clean them good so it'll connect good. If it still is alarming then the doors switches are likly. Or the door locking motors. You should be able to lock all the doors ( including the hatch) by hand and get the system to reset. Try it all again using a different door to double unlock as a lock switch might be sticking. If the system can't verify that all the doors are closed and locked it won't reset. If you connect the battery wihg the key turned on the system thinks it's already running and appeares to be in the unset mode.

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2 Answers

I have a 1998 Ford Explorer Sports, And so many times I have found my doors unlock when even making sure I locked it and trying all doors if it will open, Tried Manual locking, thru the key less entry or...


first thing to check wuold be the sensor that is in ignition cylinder, be be stuck or bad, it thinks key is in ignition and unlocks doors, start there. good luck.

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1 Answer

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usually after opening the door you can deactivate the alarm by pushing th unlock button or simply insert keyy in ignition and turn it on.

Aug 13, 2009 | 2001 Subaru Impreza

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