Hi, the thread title pretty much describes the problem. The car starts fine but just after it starts the boot window unlocks and therefore the interior lights come on. It also happens after a drive when you close the boot lid.
V annoying! BMW say it is caused by aftermarket tow bar wiring - wrong as I have disconnected the loom and it still happens.
The idrive screen sometimes but not always displays a message - increased battery discharge.
The battery is showing 12.5 on a meter about 2 hours after a 40 mile drive. Should this be nearer 13.5 - 14 volts?