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Bavarian Soundwerks' Mobile Electronics Forum
Have all your A/V and electronics questions answered here. Ipods, A/V, Radar Detectors Oh My!
Sponsored by Bavarian Soundwerks

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Old 09-09-2013, 10:52 AM   #1
MrPedals
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Join Date: Nov 2010
Location: Santa Cruz, CA
Posts: 56
My Ride: E46 M3, Mystic Blau
OEM business CD blown fuse

My Business CD unit died the other day, just want to check to see if it could be anything else before I buy a replacement.

The fuses in the glovebox are fine, checked them with an Ohm meter.

Fuse behind the head unit is fried, and every time I replace it, it instantly fries itself again when power is supplied to the unit.

I don't understand what the point of that fuse is... is it protecting the stereo unit itself from destruction or is it protecting the car?

Like is it: Power in > 10 amp fuse > cd player > ground

or

Power in > cd player > 10 amp fuse > ground

Or is it something else entirely? I have a 2006 M3 and this is the Alpine Unit.

Last edited by MrPedals; 09-09-2013 at 11:11 AM.
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Old 09-09-2013, 01:50 PM   #2
MrPedals
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Join Date: Nov 2010
Location: Santa Cruz, CA
Posts: 56
My Ride: E46 M3, Mystic Blau
Taking the HU here: http://www.shortcircuitrepair.com/vehicles/bmw.htm I will keep you posted.
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Old 09-13-2013, 02:39 PM   #3
MrPedals
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Join Date: Nov 2010
Location: Santa Cruz, CA
Posts: 56
My Ride: E46 M3, Mystic Blau
Head Unit had:

Loose solder connections
Short in the power supply
bad circuit board

Cost to repair: $285

My head Unit is one of the later-made desirable ones with all the features so I decided this was cheaper than getting one on eBay for $300

Highly, highly recommend Short Circuit car audio repair, they apparently fixed it that day and it was ready to pickup the next morning.
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