Door locks and unlocks

[Macspsi]

I've search for about 15 minutes about this so please do not tell me to search. My problem is that when I turn my key to the on position and back to the off position my door locks and unlocks on it's own. I've checked the 10amp fuse inside the car it was good but I replaced it anyway and it still does it. My radio has also stopped powering on I do not know if this is related or not. But I need help on figuring these problems out, are there any other fuses I should be concerned about?

 

[luv2rallye]

The lock/unlock may be difficult so need to ask some questions first:
- Do you have keyless entry?
- Does it do this all the time?
- What was done to the car before this started?
- Do both doors lock/unlock together when this happens?
- Do they lock right after key to On and then unlock right after key to Off OR do they quickly lock/unlock immediately after either On or Off or both?
- Do you have after market alarm?
- Does all the door open switches, key unlock, door lock switches, keyless system work properly?
- Does the problem happen while drivers door remains open?

There's going to be many possibilities: a faulty door lock relay, one of the many sensor switches, a bad ground on a switch, bad diode, receiver, short, or etacs-ecu.

As to the radio did you try testing the "Room Lamp" 10A fuse as well as the "Radio" 10A fuse both in the engine bay fusebox? Also the "Amp" 15A fuse in inside fusebox.

 

[Macspsi]

- No, unless the guy that had the car before me had it and tried to take it off but to my knowledge no.
- Yes
- Nothing was done to it.
- Yes both doors does it at the same time.
- They lock and unlock when I turn the key off only. Does it with driver door open as well
- All of controls on the doors work.

 

[luv2rallye]

Well this is a hard one.
First I'd disable any alarm system (factory or otherwise).

Then I'd check the two door open switch wires to see if one is stuck in one position (electrically speaking - not physical). They should apply a ground only when door is open. Perhaps one is permanently applying a ground - check with multimeter. Also make sure they do apply a ground only when door open (mounting screw is ground which can get corroded/dirty).

Then I'd check the two door lock switch wires and the two door lock key cylinder switch wires to see if one is permanently applying a ground. You can access the wires right on the door lock power relay [brown-white is lock, brown is unlock. You will normally have +12v there (through the relay) until the switch applies a ground.]. They should apply a ground only when activated (either lock or unlock positions). Also make sure they do apply a ground only when activated.

Then I'd try another door lock power relay (next to the starter relay).

Maybe someone else who has had this problem could chime in.