Look at this EIS, it is from a 2002 w209. I’m trying to connect via OBD using VVDI Pro (Xhorse VVDI PROG Programmer )at first with no lucky.
It was w211 st12
Diagram had a couple of components that where different, but it still worked.
W211 St12 adapter was completely different as well.
Plastic cover was 209.
Didn’t read through IR.
Successfully read on prog w211 st12.