OK, went through the fuses again and all check OK.
Reseated relays, checked wiring harness, reseated all fuses.
Opened the Base Module and didn't find anything obviously wrong.
Removed and reseated all modules.
Checked codes again and now have nothing on PIN 4.
I believe that it is the BM. ( probably the circuit that is protected by FUSE 2 ).
I'm kinda at a loss on how to continue. Does anyone know if there is someone that does diagnostics on the modules? Any recommendations on a shop that repairs them? Beckmann?
TIA

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Mark