vito door control module what is port n. 4?

[Kathvito]

Hello, according to a recent diagnostic test, my left front door control module is faulty on my vito w639 2004. I have replaced the module but the dashboard fault is still showing (door open) and an annoying beep will not stop! I have noticed that port n. 4 has no receiving pins in the module, but a wiring connector is meant to be plugged in there, how can this be? Is n. 4 for the locking mechanism?


I'd really appreciate an opinion on this.

 

[Diesel Benz]

Connector 4 is for electrically adjustable and heated outside rear view mirror.