Central Locking Issue MK7

[stephen06]

Hi,

I am having trouble with the side door locking on my transit MK7, I only recently got the van and the central locking fuse was pulled when I got it so obviously the central locking did not work. I thought it might be a simple job but it does not appear to be. I have already replaced the back door loom and now the back doors will lock but the side door actuator will still not work. Every time I press the lock button on the key the van beeps the horn, The front doors and back door lock but the side door will not do anything.

I got a new actuator and connected it to the loom from the door in the van while sitting in the van watching the actuator. The actuator goes in but refuses to extend back out again. I have tested the wiring with the door closed and all three contacts are connecting ok between the connection in the inside pillar and the connector in the door.

I have also put a meter on the 3 pin connector going to the actuator and I get a 12v pulse when the I press the unlock but nothing when I press the lock.

Does anyone have any ideas what to try next or where these three wires go back too (BCM perhaps)? If I knew where the wires went back to I could test the continuity back and test for a break.

I have hours and hours put into it at this stage and could really do with some advice if anyone has any ideas,

Thanks,

[v8dave]

The white and orange wire from the contact plate on the door pillar is connected to the BCM
It is normally earthed.
When you unlock power is applied and the two motors in the door lock run to unlock the unit.
It's the same colour code inside the door.

Violet and orange is the normal lock function.
Grey and brown is the double lock function.
Both are feed by the BCM, the functions are commoned to all locks. That is all doors lock or double lock together. Only unlocking can be selective.

I'd guess you have a damaged wire somewhere up the door pillar.