17 replies to this topic

[s_moneh]

has this ever happened to anybody? it happened to me in the summer, then wen it became cold it didn't do it. then today it read like 30 deq c on my car temp gauge and when i was inside my car i put the key in the ignition, turned it to 1st position and the locks locked themselves. Then i started the car and they locked themselves again. it did this for about 5 minutes, then i started to drive and it locked itself the entire time till i reached my destination. BUT they never unlocked, they just get pulsing to the locked spot. this seems to be doing it periodically only in the hot weather. I'm at a stand still because i don't even know what's going on or where to start.

[s_moneh]

damn i guess i'm the only one!

[Kevin.]

Happened to me once at a gas station. Luckily it was right around the corner from my house so I just went and got my extra key. Idk what caused it as the problem never surfaced again

[Yellow95]

I can be in my garage and here a click and my S70 will lock its doors. I just figured it was afraid of me.

[MattyXXL]

My guess would be the central locking relay..

[T5power]

My guess would be the central locking relay..

yup. sticky contact or something. clean it/replace it and see if it happens again. although on my 95 Turbo it did not have a lock/unlock button on the inside, i believe that is 96-97 850's. i would think that is the culprit.

[Ronny]

If you unlock the doors, the car will lock itself again unless you open a door. This is a timer built into the relay. This may be a clue for you. Do your interior lights come on when you open the driver's door? If not, the relay may time out and lock. There could be an issue with the driver's door lock module. Otherwise, I would remove and inspect the door lock switches on the driver and passenger door. Loose wires, screws, dirty switches are all potential culprits.

[BEJinFBK]

I'm with Ronny - A funky lock switch, either on the dash or in a door latch,
a broken wire in the door harness, something like that seems plenty plausible.
Don't forget the lock switch in the trunk. That key locks and unlocks, too

And both the 850's and 70 series car have that 30 second "you didn't open any
doors, so I'm locking back up" auto relock feature. But I don't think that's what's
happening with the OP. I'm going with a broken wire somewhere contacting ground.

But, if it only happens when the key is on...It may be the module.
Or it could be a bad remote receiver module. Easy enough to unplug.

Just some ideas. Weird one.

Any aftermarket stuff installed in this car?

[s_moneh]

My guess would be the central locking relay..

where is this found?

yup. sticky contact or something. clean it/replace it and see if it happens again. although on my 95 Turbo it did not have a lock/unlock button on the inside, i believe that is 96-97 850's. i would think that is the culprit.

yea the lock switch doesn't work during this period of locking itself. if i try to unlock the doors with the button it either doesn't respond or it would unlock quick then instantly lock again

If you unlock the doors, the car will lock itself again unless you open a door. This is a timer built into the relay. This may be a clue for you. Do your interior lights come on when you open the driver's door? If not, the relay may time out and lock. There could be an issue with the driver's door lock module. Otherwise, I would remove and inspect the door lock switches on the driver and passenger door. Loose wires, screws, dirty switches are all potential culprits.

850's don't have this feature! ummm i dont usually keep the interior lights in the "door open" position i just run with 0 lights all the time.

so really a simple wire can cause the whole car to lock itself and keep pulsating while the keys in the ignition? thats insane! i dont know if i wanna live with it or trace it aha....is it possible my aftermarket alarm that the bestbuy dudes put in 2 years ago could be screwing around right under the steering wheel?

I'm with Ronny - A funky lock switch, either on the dash or in a door latch,
a broken wire in the door harness, something like that seems plenty plausible.
Don't forget the lock switch in the trunk. That key locks and unlocks, too

And both the 850's and 70 series car have that 30 second "you didn't open any
doors, so I'm locking back up" auto relock feature. But I don't think that's what's
happening with the OP. I'm going with a broken wire somewhere contacting ground.

But, if it only happens when the key is on...It may be the module.
Or it could be a bad remote receiver module. Easy enough to unplug.

Just some ideas. Weird one.

Any aftermarket stuff installed in this car?

so i have to open every door basically and check for anything? damn lots of work

umm i know my 850 doesnt have this feature guaranteed its never done it for me nore with the aftermarket alarm has it ever done it

it only happens when the key literally gets put into the ignition, and when its baking outside. if its neg deg weather or chilly it doesnt happen

aside from the alarm any sort of other wiring wouldnt come close to anything to do with the doors

[Bah]

I recently learned about this whole "lock after 30 seconds" thing lol...freaked me the hell out, since my 93 didn't have it.
Pretty cool feature, especially now that i know you have to open the door. It only does this with the key fob fwiw, with the keys if you unlock it stays unlocked, or atleast i ran into the 30 seconds bizness after i finally got a key fob.

All that aside, when my 93's locks died eventually, i believe this is sorta the similar symptoms i had. Unfortunately, the death of mostly all the locks was alot quicker then what you had. If you search through here, if the locks are constantly trying to lock, they WILL eventually burn up. So, don't think ok this will be fine. If it gets worse and starts doing it more then just when the key is in the car, prepare to lose 90% of your auto locks. There is documentation of this happening to people around the forum, idk how old it is though.

The whole key in the ignition thing is a IDK , and the heat makes more sense to what they are saying about relays and wires. When its hot, the poor contact expands and generally loses continuity. Cold, vice versa. You see this everyday with the ABS modules.

I would follow what they said above for testing. I honestly am shooting a guess here, but, iirc the locking relay has a 'K+' terminal, which is the signal to lock all the doors? It's been a while so idr, but, i would look into the locking relay after everything is said and done.

[MattyXXL]

where is this found?

Under the drivers side dash... relays 205/206
***Edit*** Added pic from vadis

Edited by MattyXXL, 02 May 2012 - 01:44 AM.

[BEJinFBK]

Aftermarket alarm...
Prime suspect!

[the commissar!]

My Pathfinder would do this occasionally and it had to do with the door switches...in that case, the rubber weather protection had worn through and the switch could not decide weather the door was opened or closed and would cause the central locking system to (seemingly) randomly lock and unlock the doors. Point being these systems can be sensitive and any combination of all those little connections, relays, etc... mentioned above can be the source of your problem...good luck

[s_moneh]

ok i'm going to have a look at some things, my driver door was making a funy noise by itself at one point today so well see wat happens! keep ya posted

[s_moneh]

ok so i did a bit of a test where i started to unplug all the actuators 1 by 1 seeing if it would stop. unfortunatly it kept doing it so i know its none of the actuators.

next move is that relay above the pedal assembly

and possibly after that the aftermarket alarm well see how she goes

[s_moneh]

Pulled the alarm, so far it seems legit, ive never seen a more worse alarm install in my life, jesus christ it could have shorted anywhere legit

[Ronny]

So are you going to remove the aftermarket alarm? I don't get why anyone would bother installing aftermarket unless the OEM alarm was faulty and they were looking for an easy solution. Hopefully you can get everything back to original. Good luck.

[s_moneh]

Yea the aftermarket alarm is gone! It wS good for the 1.5 years i had it. Thr point of it is the options, 2 way, distance, much more functionality then a simple lock and unlock button. Sucks it was happening but looking at the wiring i was not surprised it shorted out somewhere. I may install a different alarm on again, undecided right now about it tho