Forum:
The central locking has stopped working on my Fourtrack, I get a click from the passenger door but the lock doesn't work. I have checked the voltage going to the door and seem to get a pulse +12v or -12V when operating the other switch. Does this point to the relay or actuator being faulty? Does anyone have the parts for sale?
WD40.
Try spraying WD40 down each door's locking catches. NB .. another door might be the problem - may not be the door that clicks. Dirt gets into the mechanism and stops it activating. One activator sticks and none will operate.
If that fails then its probably an activator failure.