Central locking issue

[usn90]

Hi

My car has developed a fault with the central locking, when using the remote fob the door pins will either go up and down very quickly or vice Versa depending if the car was locked/unlocked at the time, so I can’t lock/unlock the car with the fob.
Using the key everything works as should.

Any ideas what the issue could be?

[paintman]

Be an idea to tell us what make, model & year your car is.

[usn90]

Ferrari 355 spider 96

[Penelope Stopit]

I am taking a guess that you are using the key in the drivers door, if so....

What's happened is that something has failed to or in the drivers door

If you were to use the key in the passenger door you will very likely notice that the drivers door doesn't do anything

You have proven that the switch part of the drivers door central locking circuit is good and have done so by turning the key in the drivers door to the lock position and noticing that the passenger door does lock and does open when turning the key to the open position

What you now need to prove is that the wiring from the central locking control unit to the drivers door central locking motor is good, you will need to connect a 12 volt test lamp between the two motor cables (not the lock/unlock switch cables that could be built into the motors case)

If the cables check ok you will need to check the motor and it will very likely be faulty unless the locking mechanism in the drivers door is very tight and preventing the motor from operating it

It will help you a great deal if you can find a wiring diagram that will point you to the correct cables for testing

It is very unlikely that the door motors are wired through seperate fuses but is worth bearing in mind

[usn90]

Thanks very much for that, helps a lot

Yes thinking about it I don’t think using the key from the passenger side unlocks the drivers door, however using the key in the drivers door does unlock the passenger door.

[Penelope Stopit]

Good luck in finding the fault, you're half way there