Where are the K BUS connections? and is it just a case of testing for a live connection, at source, then tracing it back to each unit, I understand there is a soldered multi joint by the drivers seat, that can be problematic, before everything worked fine, except for the radio, I fitted an android unit which worked fine, and left everything else unplugged because it was draining the battery, and when i got the BM24, I put the original equipment plus the BM24 back in the car, and since then, everything is dead, sat nav, tuner, and tv box.
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