If you get a passenger door lock actuator make sure you get it from a late (face-lift) model.

The door lock and switch are different on the later cars, an early 940 is probably the same.

When I fitted mine I used a small universal actuator and removed the switch, that way you can use the wiring for the switch for the new actuator to save battling to get two more wires through the door to body conduit.

Also I would recommend using the remote receiver to operate the existing relay rather than switching the full load with the electronics in the receiver.

If you need any additional info just let me know.

Colin.

1990 740SE B200E/M47, remote C/Locking.