my cinqs centeral locking went nuts to day and wouldent lock, the doors and boot would lock then un-lock! anyone had this problem b4 and know how to cure it?

when my battery was a bit flat i coudnt lock the doors, it would lock then open again. then when my door wasnt closed properly the central lockin wouldnt work on both sides and only the drivers side would lock

Ive had this problem. My car went back to Fiat 5 times cos it was under warranty, they replaced the whole central locking system but it still didnt fix it. Be careful because it got the the stage where if i locked the car on the drivers door, then went to the passenger side and lifted the handle, it would unlock the whole car!! Locking from the passenger side always worked tho.

The only way i managed to fix it was when i put my alarm in and used the remote locking from that.

Could be a sticky door solenoid, try using the key from the other side and see if it stays locked - if so, that's the duff one.

Was it really cold? The sticky solenoid Pete speaks of could be your problem.

Every winter I have some fun with my locks, go out in the morning and use de-icer to get the drivers lock open then have to jump in and open the passenger door cos the locks just jump up and down!

Madness!

Liam

have u changed the horn?

sounds a bit dull but when i changend the standard horn to an air blower the wires hit the manifold sending the central locking nuts and blew a fuse or 2 for the horn until i realised why?

when u turn the engine off and open the doors do the locks jump up and down

it happens all the time now not just when its cold, the only way i can get it to lock is to hold the key in the lock and wait for a bit as the door locks pop up and down for a bit and after they stop i have to go lock all the doors indevidually! its not just the drivers door but the passenger one aswell.

Hang on i'm gonna try and find the post i put up about curing this.

Right here goes. The motors in the front doors both have actuators on them. This basically means if you lock from either side when the motor moves down the actuator tells the other motor too move down and lock the other door. What tends too happen is the linkage between the motor and the lock is too short. The motor builds up momentum goes all the way down and bounces back up a little. The bounce is just enough for the actuator too tell the motors too move back up.
Too solve it strip the door almost certainly the driver side. Take the linkage with a slight Z bend in it that goes between the motor and the lock. Remove the Z bend with pliers by straightening it and put it all back together. This stops the motor bouncing up and keeps the doors locked.
Hope this helps and keeps the swear box empty.

Hmmm, maybe.

What also happens is that when you lock the door either with the key or by shoving the door pin down inside, you force the door lock motor past it's 'seated' position.

The seated position is where the central locking motor sits at rest, in a groove so to speak. If you have remote central locking, it gets an electrical signal and tells the doors to lock. The motors drive the locks closed, relying on them not slipping from their seated position. They close an electrical contact, telling the central locking system that it has closed properly and life is good.

If they don't stay in their 'groove', the door will remain unlocked - the lock pin won't be pulled down or pushed up as requested and the required circuit won't be made. The central locking system will say 'hey up, the boots locked, one door's locked but the other's not playing ball for some reason. Nuts to this, I'm gonna open it all again"

When you use the key or door pin to unlock or lock, what happens is you force whichever lock motor out of it's 'groove', lock that door and make the circuit. Central locking system wakes up and says "oi oi, lock (or unlock) time" and puts the other motors into the same position as what you've just done with key or pin. Motor you have just forced then sits back in it's 'groove'. If any one of them doesn't make the circuit, it'll go back - i.e. do the opposite of what you've just tried with key / pinky.

So, using the key or door pins, you force the motor out of it's groove. This will in time cause wear, which can mean that when it's asked to lock or unlock by electrical means that it slips. Slip can be caused by old age and stiff mechanisms too.

I'd recommend you clean and lubricate the lock mechanisms inside the doors, and check to see if one of the motors is slipping by using the other side door key / pin. If you force the 'bad' one, the system should work fine.

Enormous fun can be had in the ice with this. You unlock the door with the key or remote locking, but one mechanism is frozen. Theoretical machine based communiccation goes a bit like:

(key) Open sesame.

(locking ecu) Bugger off, I'm locking it again.

(key) open again please

(locking ecu) Oi, I told you, bugger off. <locks doors>

(key) Let's not be silly, It's cold and I need to go home. <opens locks>

(locking ecu) You ain't coming in here, one of my motors says No. One out, all out squire. <locks gates again>

(key) Right, you electronic things always think you know best. Bugger you. <opens lock and person opens car door at same time>

(locking ecu) Eeeeek - I've got one open, one locked and I'm al confused. I'll unlock and lock all the doors repeatedly until something happy goes on.

(key) haha, I'm in.

(locking ecu) Right, I've locked them and they're staying locked. I'm happy.

End of story - driver is in car, driving home. Central locking is locked, but he don't care for now. It'll probably be defrosted by the time he gets home anyway.

The freezing scenario can be reproduced by a sticky motor if you follow it through.

On balance though, reading this - I think I need to up my doseage. Nurse!

Kindda off topic but hey...

Ace description fixit lol

My central locking does the same thing too. I always test the handle after i have locked it, sometimes pulling the handle causes all the locks to pop back up. Usually fails first time but naerly always workd the second.

My Cinq Did This, If The Motor Is Screwed Onto Tight Or Has Shifted Slightly, The Bar That Lifts The Locking Pin Cannot Lock Properly

Could Be The Same On Urs

Why not just do as you are told straighten the z bent piece of metal didn't write the reply for a laugh

MotorWorldChink said:

Why not just do as you are told straighten the z bent piece of metal didn't write the reply for a laugh

Click to expand...

Calm yourself down.

It's that shape for a reason, if you need to bend it to get the central locking to work you're disguising another fault.

after having to dive into the cinq through the boot on the school carpark (much to the enjoyment of a group of school kids) i decided i should have a look inside the doors and the door locking mechanism things were loose so i tightend them up and the problem wasnt solved so after a hour of being miserable and sitting in the garage poking the cinq with a spanner i found that the drivers door was loose on its hinges and once it was all back on level the locking worked again, thanks for your help everyone!