Having something similar to you. KCM 831. Was a bitch to get the shaft communication back but I finally got it. I have no car faults but the car only takes calls from inside the car or from the controller. Won’t answer my landing buttons. Did you ever get a concrete resolution to yours? Oh and it’s looking like we have lost the EPROM in the CPU40 because I lose the shaft setup every time I power off.
But it’s be nice to get it running for them while they wait for replacement board for the EPROM.
