I just got my first MB.
It's a 2001 SLK 320.
I am having a problem with the dome light not turning off when it is in automatic mode. The door lock switch inside the car will also not lock the doors. It will unlock but not lock.
I read some where that the door lock switch will not lock the doors if the door is open. I am assuming this is all related to the same problem.
I pulled out the PSE out and took it all apart.
It did not seem wet or corroded at all.
I then checked all the door switches and boot lid switch with an OHM meter.
They all seem to be working fine.
Could it be a shorted dome light itself?
I also noticed that the alarm isn’t working properly.
I can set it and the doors will lock and the light will flash but the alarm will not go off if I open the door.
I’m assuming it’s all related to the same problem.

Can any one help with this?
Thanks in advance.