Ford Sierra Manual

Central door locking components - operation, removal and refitting
Body electrical system / Central door locking components - operation, removal and refitting


Note: If a central locking solenoid or motor is to be renewed due to jamming or overheating, the central locking relay must be renewed at the same time even if it is believed to be working correctly. Before starting work on the central locking system, unlock all the doors and the tailgate/boot. Make sure that the keys are outside the vehicle before reconnecting the battery on completion of work.

Operation
Models up to 1987
1 The central locking system is activated by turning the key in the drivers door lock, and the locks are operated by solenoids.

Models from 1987
2 The system is activated by turning the key in either of the front door locks, and the locks are operated by electric motors.

Removal and refitting
3 Disconnect the battery negative lead.

Models up to 1987
Switch (drivers door lock) 4 Remove the door lock.

5 Remove the two securing screws, then withdraw the switch from the lock assembly and disconnect the wiring plug.

6 Refitting is a reversal of removal, but ensure that the cut-out in the switch lever engages with the lock lever (see illustration).

50.6 Drivers door central locking switch - models up to 1987
50.6 Drivers door central locking switch - models up to 1987

A Switch lever cut-out

Solenoids (passenger and rear door locks) 7 Remove the door lock (see illustration).

50.7 Central door locking assembly models up to 1987
50.7 Central door locking assembly models up to 1987

A Solenoid
B Door ajar switch (not fitted to all models)

8 Remove the two securing screws, then disconnect the solenoid operating rod and the wiring plug and withdraw the solenoid from the lock assembly.

9 Refitting is a reversal of removal.

Solenoid (tailgate lock) 10 Open the tailgate and remove the trim panel.

11 Disconnect the solenoid wiring plug and earth lead, and the operating rod, then remove the two securing screws and withdraw the solenoid from the tailgate (see illustration).

50.11 Removing a tailgate lock solenoid - Hatchback models up to 1987
50.11 Removing a tailgate lock solenoid - Hatchback models up to 1987

12 Refitting is a reversal of removal.

Models from 1987
Motors (door locks)
13 Remove the door inner trim panel.

14 Remove the retaining screws and disconnect the wiring plug and the motor operating rod, then withdraw the motor from the door.

15 Refitting is a reversal of removal.

Motor (tailgate and boot lid locks) 16 Open the tailgate/boot lid and where applicable remove the trim panel.

17 Remove the retaining screws and disconnect the wiring plug and the motor operating rod, then withdraw the motor from the tailgate/boot.

18 Refitting is a reversal of removal.

Models from 1990
Motors (door locking)
19 On models from 1990, the door locking motors are incorporated in the door lock units (see illustrations).

50.19a Front door central locking motor securing screws (arrowed) - models
50.19a Front door central locking motor securing screws (arrowed) - models from 1990

50.19b Rear door central locking motor securing screws (arrowed) - models
50.19b Rear door central locking motor securing screws (arrowed) - models from 1990

20 To remove a motor, first remove the door lock.

21 Remove the two securing screws, and detach the motor from the lock assembly.

22 Refitting is a reversal of removal, ensuring that the motor operating rod engages with the lock lever.


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