Anyone know pins on W211 lighting switch?

[E240estate]

Trying to locate the pin on the s211 light switch which controls the rear fog light. Need to pick up a signal from this for trailer wiring. Not possible to get one from inside the tailgate as wiring too difficult.

Got the rest of the connections sorted just need this one.

Thanks in advance if anyone can help with a pinout diagram for the switch.

 

[richard]

It may well not be a discrete pin. Older cars use LIN between the front SAM and the light switch. Much older cars and newer cars have a few discrete wires.

You'll need to get the signal from the rear SAM (left side of boot, attached to fusebox)

R