Software update glitch?
I recently had a software update applied to my K12S. I believe it only affected the ZFE (body module?) and it seems to have negatively affected the way an external battery charger works.
Prior to the update I was able to plug in my CAN-bus aware BMW charger in to the accessory socket on the K12 and it would start charging and sequence through all four charging stages, lighting the appropriate LED status lights on the charger. Depending on battery state, this could take several hours. When it got to the last stage it would remain there, providing the maintenance or float charge.
After the software update if I plug in the charger as before none of the status lights on the charger will come on and the red emergency flasher light on the left hand grip will blink about once every 2 or three seconds. If I turn the ignition on and then plug in the charger and then turn off the ignition OR plug in the charger then turn the ignition on and then off the charger will start functioning normally and the red light on the left hand grip will stay illuminated. However, sometime after the charger reaches the last stage (not sure how long as I didn't catch it) all the charger status lights go off and the red light on the left grip goes back to blinking. When all the status lights are off and the red light on the left grip is flashing the battery is NOT being maintained!
So, with this update, your battery charger will run through one charge cycle and then shut off. Your battery will not be on a maintenance or float charge. I measured the battery voltage during the above test and can confirm that the charger shuts off, never to come back on unless you turn the ignition on and then off again, and then you only get one charge cycle again.
Anyone else with a late softare update observe this? I'll try to report back with the software update version number when I speak to my dealer when they open tomorrow.