Join Date: Feb 2008
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Could be the locking solenoid on the door catch is stuck or gone belly up - can you hear the solenoid clunk in the door when you lock the car?
If you can hear it, it's working but not actuating, so it may be the plastic pivot bushes on the wire rod are worn out and not pulling the catches sufficiently to trip the lever mechanism.
I'd suggest pulling the door card off and checking the solenoid action visibly.
If it doesn't work, try pulling the connector plug apart and reconnect, it's sometimes enough to wake up a dead connection.
The connectors can also get wet and corrode if someone has removed the plastic water deflector sheet from behind the door card. (usually stuck to the door frame over the big holes).
You could also try earthing one of the solenoid connectors and run a wire from a live circuit to the other to see if it will trip the solenoid, or alternatively, plug a voltmeter into the feed wire connector and see if there's any life when you hit the lock button.
Failing a dud fuse, the other possibility is a broken wire where the loom exits from the body pillar, but the voltmeter check will help you locate that if you stick the probes into the main loom socket.
Currently in Francofile's garage:
2000 Renault Espace RXE 2.0 16V, plus a 1973 V12 E-Type Jaguar (When it's all back together again).