Classic Central locking

MadManish · Mar 26, 2019

So I took the plunge and got a 1992 classic 200 tdi manual to replace the 90. Its like a Royce in comparison!!. Now there is a little list (just loads of little things) and the one that I would like to sort out first is the central locking.
I did find the fuse under the passenger seat which was blown. I replaced it and hey presto the leccy door mirrors started working (well sort of). But no central locking not a thing!!
Any pointers would be very helpful and appreciated.

MadManish · Mar 27, 2019

If it helps the fuel filler cap button thing works like a dream

discool · Mar 28, 2019

Is it remote or manual central locking? I’ll assume it’s remote and u know how the central locking components work, so with your wiring diagram start checking the voltage to and from the ECU and it’s functioning ok with the fob, and then onwards to the master actuator in the drivers door, the other doors have slave actuators so get the drivers door working the others ‘should’ follow.

MadManish · Mar 28, 2019

discool said:
Is it remote or manual central locking? I’ll assume it’s remote and u know how the central locking components work, so with your wiring diagram start checking the voltage to and from the ECU and it’s functioning ok with the fob, and then onwards to the master actuator in the drivers door, the other doors have slave actuators so get the drivers door working the others ‘should’ follow.

Mate its manual locking. Will it still have an ecu??

discool · Mar 28, 2019

MadManish said:
Mate its manual locking. Will it still have an ecu??

No not necessarily if it’s the basic central locking system, the drivers actuator controls the switching for locking or unlocking.
So if fully functional and starting with all the doors locked, when the key is turned in the drivers door lock to unlock that door will unlock mechanically and the remaining door electrically via the slaves, switched by the master actuator.

Turning the door key in the lock also move the master actuator, if this is not happening or the 12v supply to it is missing then the result is no central locking unlocking.

You will have to remove the door card on the drivers door, locate the actuator and move the armature in or out by hand that may lock or unlock the doors if it does then a slight of the actuator is required, slacken
the square mounting plate to do that.
If nothing happens the the power feed is missing or the micro switch within the actuator is faulty, if so replace the actuator. The RRc Haynes manual will give u the wiring colours at the actuators.

That’s about it

MadManish · Mar 28, 2019

discool said:
No not necessarily if it’s the basic central locking system, the drivers actuator controls the switching for locking or unlocking.
So if fully functional and starting with all the doors locked, when the key is turned in the drivers door lock to unlock that door will unlock mechanically and the remaining door electrically via the slaves, switched by the master actuator.

Turning the door key in the lock also move the master actuator, if this is not happening or the 12v supply to it is missing then the result is no central locking unlocking.

You will have to remove the door card on the drivers door, locate the actuator and move the armature in or out by hand that may lock or unlock the doors if it does then a slight of the actuator is required, slacken
the square mounting plate to do that.
If nothing happens the the power feed is missing or the micro switch within the actuator is faulty, if so replace the actuator. The RRc Haynes manual will give u the wiring colours at the actuators.

That’s about it

Nice one mate I think its the actuator in that case as I had the card off yesterday and manually moved it but nothing happening. I guess I better check for 12v first

norseman · Mar 29, 2019

Or press the door buttons down & lock the car with the key … simples

MadManish · Mar 29, 2019

So I have 12v on the connector going to the door lock but nothing on the connection to the actuator. Im guess in the actuator is nothing more that a big switch. Oh and its the 5 wire one

MadManish · Mar 29, 2019

norseman said:
Or press the door buttons down & lock the car with the key … simples

Wheres the fun in that??

discool · Mar 29, 2019

MadManish said:
So I have 12v on the connector going to the door lock but nothing on the connection to the actuator. Im guess in the actuator is nothing more that a big switch. Oh and its the 5 wire one

Yes it’s just a switch but not that big, it’s micro.

I don’t have acces to my diagrams the moment... but two wires go to the slave actuators the “switch” changes the polarity of the two wires so the slaves have a lock/unlock action, two wires are 12+ 0- and the fifth wire is the signal wire from the remote ECU, if that function is fitted, which I’m surprised it’s not fitted to yoru vehicle, as its 5years younger than the 87MY RR I owned, that had a 4wire master actuator, which I changed when I fitted an alarm system with a remote fob to enable, all that was required then to get remote central locking was to change the actuator to a 5wire plus install an additional fifth wire and Ha-Ho I had remote central locking, my first car to have this.

MadManish · Mar 29, 2019

discool said:
Yes it’s just a switch but not that big, it’s micro.
I don’t have acces to my diagrams the moment... but two wires go to the slave actuators the “switch” changes the polarity of the two wires so the slaves have a lock/unlock action, two wires are 12+ 0- and the fifth wire is the signal wire from the remote ECU, if that function is fitted, which I’m surprised it’s not fitted to yoru vehicle, as its 5years younger than the 87MY RR I owned, that had a 4wire master actuator, which I changed when I fitted an alarm system with a remote fob to enable, all that was required then to get remote central locking was to change the actuator to a 5wire plus install an additional fifth wire and Ha-Ho I had remote central locking, my first car to have this.

So getting no voltage at the actuator is pointing at something else based on what you have just said??

norseman · Apr 2, 2019

MadManish said:
Wheres the fun in that??

For my part a damn sight more fun that faffing about with wiring & lecky components

MadManish · Apr 5, 2019

Well its not the drivers actuator. Any more ideas guys???

discool · Apr 5, 2019

MadManish said:
Well its not the drivers actuator. Any more ideas guys???

Because the vehicle has a 5 wire actuator I’d be looking for the ECU which would send voltage to the actuator, at least find the where the supply, if u had it, originates from ie. fuse.
You really need a wiring diagram for your vehicle, the Haynes manual will has several for the years.

Classic Central locking

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