Blowing 30a Fuse On Central Locking C5

[Guest Jimmy H]

My C5 is perodically blowing the 30A fuse that controls the central locking. The problem is becoming more regular (currently constant). When I use the key fob to lock / unlock the doors the fuse blows violently (earth?). Each front door can then be lock / unlocked by using the key in each door. The rear doors stay locked or unlocked (depending on how they where when the problem occured.)

When I use the key fob after the fuse has blown the indicators flash and I can hear a relay fire but now magic with the doors. Any ideas?

Many Thanks

 

 

Jimmy

[Randombloke]

My C5 is perodically blowing the 30A fuse that controls the central locking. The problem is becoming more regular (currently constant).

 

It sounds like an actuator is sticking or stuck. Have you had any previous experience of one door not opening or locking ever? This is where I would start looking.

 

I've not looked at the wiring in detail but I think you will have to find a way to drop each door lock actuator off in turn, and when the fuse stops blowing that's the faulty one.

 

Is it a saloon or estate? Any leakage into the rear hatch/door may have caused the actuator there to seize, and it's not that hard in the estate to get to it and disconnect it.

 

Also check that the fuel flap locking pin has not been bent or damaged in any way, as that also locks when the car is locked. You may be able to check this by locking the car with the fuel flap open.

 

All an educated guess, one of the Citroen techs may soon tell you the exact truth.

[Guest Jimmy H]

Mine is a saloon, we had the car for a few months before the problem appeared. We have not had a door sticking problem, although I can see how the actuator could cause a problem. Now that you have said that I have a feeling that it may actually be linked to the dead lock, as one time when the fuse blew I had randomly pressed the buttons on the key fob while I was putting a bag in the foot well ( I got locked in at this problem and had to lean out of the car "Dukes of Hazard" style to open the door).

 

I will try to find a diagram on the location of the actuator so that I can disconnect them, thanks for the tip and I will et you know the outcome.

 

Jimmy

[Randombloke]

Now that you have said that I have a feeling that it may actually be linked to the dead lock, as one time when the fuse blew I had randomly pressed the buttons on the key fob.

 

Hi Jimmy,

 

Is your car a Mk1 (->04) or Mk2 (04->)? According to the Mk 2 manual I have, deadlocking is only engaged when you press the lock button on the fob twice quickly or one long press. If so, try not using the deadlock function.

 

On the Mk 1 it is not possible to lock the car without deadlocking using the remote. You can lock the car without deadlocking using the key, but the initial turn deadlocks, the car, a second, and immediate turn of the key removes the deadlock but leaves the car still locked.

 

Does the fuse blow when you use the lock button on the dashboard? I suspect yes. However, if no, then the deadlock maybe the source of your problem.

[Guest Jimmy H]

Mine is a MK2, I must admit I have not tried the dash button on its own, I will give that one a go, at least I am at a startign point.

 

Thanks Jimmy

[paul.h]

If it is a mark 2 then you should still be under the 3 year warranty, if so a trip to the dealer will save you some money and maybe time.