[truckis]

probably it is a hardware (sdconnect) failure mate.
if das works, what das vehicle that you diagnose?
you need to test das vehicle that read ignition from CAN.
you can try w204 with das. if das gets ignition error too, it is definitely a bad sdconnect.

I have tried with w204 in das and i works   so maybe not a bad connect. Multiplexer is purchased with industrial engine license and works with Xentry, could it be locked, and can only be used on Mercedes industrial engine?