[N5GKP]

I had a fault a while back with a E91 320D having what they seemed to think was an IHKA panel / heated seat issue after the blower cable QE was carried out, through various trawling of wiring diagrams and testing of god knows how many different plugs/wires/components I concluded that the JBE control unit actually had an internal defect which was causing a fault on a different system in the vehicle that was having a knock on effect with the IHKA.

I don't know if that makes sense (I'm tired I apologise!), I can't remember a huge amount about the fault as it was a few months and many hundreds of cars ago, but that could be a possible avenue to investigate?