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Sasha,
I've read your other posts and I am new to BMW ownership, but I know cars pretty well. I have a 2007 328i sedan that has some elec. gremlins that also I'm trying to resolve and here's what I've found that may be helpful to you.
1) Not sure if our fuse panels are the same, but there should be a piece of folded cardboard with a diagram on the inside of the fuse panel cover. If not, I'll be glad to take a pic. of mine and post. Maybe they're the same, dunno.
2) No idea about hand held scanners, but most independents these days have higher end scanners that should read most BMW codes- my buddy has one. If they can hook it up and move your sunroof and seats, they can probably see get most modules on the car. You don't have to go to a BMW dealer. My car has a few CAS codes.
3) A lot of your issues sound like battery to me. My battery is 3 y.o. and it checks out under load; although, it only shows ~ 12.4 V, but I also have head and brake lights staying on occasionally and some other annoying elec. issues. Other forums I've visited suggest these symptoms can be due to battery. Apparently, these cars/modules do weird things when they see low voltage and they don't like old batteries. I'm planning on replacing mine.
Sounds like you replace the battery before anything else and then go from there. It's possible some of this stuff will go away. My car could have come with one of 3 different batteries- another BMW quirk... You need to check the cranking amps and amp/hr rating and probably the dimensions on yours and then buy one with closest match, or so I've been told. (Note: you will need to get the new battery initialized to the car, again, an Indy with a good scanner can do this).
Hope this helps,
Walt
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