What is the electrical fault in my BMW 3 Series estate?

I have a 2008 BMW 3 Series estate. When I bought it 5 months ago it was fine, apart from a problem with the rear tailgate window which wouldn't open and this was fixed. A few weeks ago I noticed when I unlocked the car the window on the tailgate popped open and wouldn't close. When I started then engine a fault warning light appeared and the clock and date needed to be reset. My local mechanic has plugged in his computer and noted quite a lot of fault codes which he doesn't recognise. The issues with the clock and rear window appear intermittently. I have tried disconnecting the negative on the battery to reset but problem remains.

Asked on 13 January 2017 by

Answered by Honest John
Possibly a battery earthing problem. Or water getting in to the area where the battery sits. Check that first and if it doesn't fix it call in a local <Car Electrical Specialist> in www.yell.com/
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