| When you press the pin, its linkage moves a pair of levers within the lock mechanism which in turn slide a switch in the electronic actuator. The switch then actuates the electric motor in the actuator that locks your door, and it sends a signal to the central locking mechanism to lock the other doors.
It is possible that something has hit your button hard, and the linkage or one of those levers has gotten bent and won't move the switch far enough to actuate.
It is more likely that the microswitch in the actuator has failed. That was what was wrong with mine. The way to test that is to remove the actuator, plug its wire back on, figure out which lever is the lock (look in the door as you move your lock button) and then move the switch with your finger and see if the motor in the actuator reliably functions.
I opened the actuator and could not even see a part number on the failed microswitch, so I bought a new actuator on line for about $60. I think they are around $100 at the dealer. It was a little tricky to get the actuator and levers all lined up so it would snap down on the lock mechanism properly, problem was exacerbated because I was outdoors in poor light, and it was starting to rain, but it went on and all works fine now.  |