Focus central locking question

[Baffled Spoon]

Hey, can any of you shed light on why only 1 of my doors (the rear passenger side door) will not lock and unlock using the remote or the key in the door. I can only lock/ unlock it from inside and the deadlocks won't work for that door either.

The mechanism felt a bit stiff so I used some(copious amount) of WD40 and then the door did lock and unlock with the others as normal. The door was sligthly slower and lagged behind the others after 3/4 attempts and then stopped working again. Any ideas?

Thanks.

[Baffled Spoon]

Thanks for the advice Paul. Will try it as soon as it stops raining.

[Baffled Spoon]

Quick update, sprayed loads of wd40 in, but no joy. Took the doorcard and weatherseal stuff off and manually cleaned up the solenoid, cables, checked the connexions etc. Put everything back but still didn't work. Sprayed more wd40, straw fell in door (d'oh!).

Next I checked the wires going into the door and found a broken wire. Quick bit of electrical insulating tape and voila, cl now works (although I'm now one wd40 straw short )