Easiest way to reset K-bus (when cluster fails) other than unplugging LCM

[ElectroDan]

Is there a quicker way to reset the K-bus than disconnecting/reconnecting the LCM?

I suspect I have a faulty stereo system.

Around once a week since buying my 4.8iS last year, the K-bus would crash, where the indicators stop showing on the cluster, can't control the stereo, CD-changer goes offline, etc. I'd been temporarily fixing this by unplugging the LCM, but it's a bit of a faff.

I had thought it was the LCM gone bad, but I sent this off and had it tested (and the common components that fail were replaced), and it had no faults show up. So, once that was refitted and the problem came back, I decided to leave the stereo turned off (the screen was on but orange light off and no sound coming out) for a month and the problem didn't occur again.

I've got a replacement BMW headunit on it's way, but the K-bus crashed again driving in today when listening to music, as I now have a bluetooth adapter connected in place of the CD auto-changer. Is there an easy way to reset the K-bus?


I've found the battery slowly drains if I don't disconnect/reconnect the LCM (or battery) to reset the K-bus, enough so that the car won't start the following day. A tad annoying! So I have to perform the reset fairly soon after it happens.