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Wiring, schematic, electrical diagrams, torq settings, parts info, error/fault codes, full assembly/dissembly, service instructions and a lot moreetc are basic contents of these online books they here on this websit e https://big-manuals.com/
Do you have NAV option? If not, you may be able to reset radio by removing all three fuses, one in glove box and others in rear panel right pass side, then put them back in, and this resets radio default which clears up issue in most cases. If you don't want to pull fuses, you can also disconnect battery, but be careful. With NAV, it gets more complicated. CeraCoat-NanoTech.com
Most sat nav/radio issues are caused by a flat battery! The most simple solution to try is th switch the vehicle off, go to the fuse box on the right hand panel of the boot (as your facing boot) remove fuse 24 (5 amp) for 5 minutes then replace and start vehicle as normal! This will reset the nav/stereo system! Rich B
I know this is an old thread, but my 2006 325i Nav screen went bank also, but the radio still played. I noticed the glove box light and trunk light did not turn on also. I was told from mechanics is was probably a CID module for $2200, even though I mentioned the glove box and trunk light light were out and specifically inquired about a fuse. The mechanics never checked the fuses, because I checked my fuses in the glove box and found the fuse 61 marked with a BMW symbol that looks like light bulb was blown. The Nav screen started back up once the fuse was changed.
you will have to pull the radio out of your vehicle and get the serial number off of it. bmw keeps a record of old radio codes. if you take your vehicle to the dealership usually they will retrieve radio codes for free. And even pull the radio out to get the serial number.
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