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Hi Colin, I wrote this post a good few years ago but to answer your question; the only way to find which door is causing the warning is to monitor the door inputs to the GEM with a multimeter. One of the pictures shows which pins to monitor for each door. Rgds. Julian

Hi Guys, Just thought I would update and possibly help others with similar problems.. I purchased a 'guaranteed' air con control unit from a breaker in Germany for £35 and prepped myself for a weeks holiday to strip everything down. Just prior to starting on the Saturday I happened to find a solution offered that wasn't a 'fix' as such. The guy advised that he disconnected the electric preheat positive terminal and it resolved all his issues - sounded a bit far-fetched but thought it worth a try (If I'm honest I was looking for alternatives because the strip down was giving me nightmares!) Anyway, cutting a long story short, I disconnected the positive cable and made it safe, tried the air con and amazingly everything now works!! All the vents open/close when they should, temperature control is back as well. All I have lost is the pre-heat on cold days (which I've never had in other cars) so not a loss really - win/win situation for me! Oh, anyone need a s/h air con control unit I know where there is one! Ian

Try this video Looks like most of it is clipped on