Maybe this won’t be news to a few of you (maybe it will). Anyway, I popped out to the car to disconnect my tuning box and send it back for tweaking. I literally unlocked the car, opened the driver’s side door, popped the bonnet, closed the driver’s door, lifted the bonnet, whipped the box out, closed the bonnet. It was raining, so I opened the passenger door, sat in the passenger seat, closed the door and the entertainment unit came on automatically, playing what I last had on (Angel Dust/ Faith no more). The key had been nowhere near the ignition.
Never knew as a feature that if you unlocked the door and jumped in the passenger seat (not the driver’s seat) that the audio unit would start up all on its own.