SHZH Fault Code E784 - Can Low wire error - Need diagram

[kglbmw]

Hi

Can anybody help me with a wiring diagram for the SHZH and IHKA modules on my E61LCI 2008 535d? Ex. a ISTA screenshot will be fine
I have a auxiliary heater, which normally are working fine, but now I got this E784 error, and I assume there is a bad connection or broken wire somewhere, but I do not know where to start looking.

Which color is the KCan Line wires in my model? I can see it might vary in color.

If I'm lucky, it might only be the connector in the heater which need to be cleaned

Thanks!