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      07-18-2026, 01:01 AM   #1
FatboyDean
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Drives: 2008 135i MT
Join Date: Nov 2019
Location: Vancouver, Canada

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Fusebox: how could I messed up the TCU?

Hi all,

I have a 2008 135i M sport
I was trying to figure out why my front 12V power supply not working, so I went on n checked a few of them fuses, however I think I misplaced some of them which caused my telematics module/amp not working any more.

The symptom I got: SOS error, no sound in stereo, aux greyed out. I know the headunit is working fine cos I can insert a cd and it reads, just no sound! Also the TCU in the trunk does not seem to have power cos the fans not moving at all.

I took a pic of my fusebox, feel free to point out which fuse(s) were in the wrong place, I checked all of them seemed OK not blown. I also checked the following 14, 15, 18, 19, 27, 42, 56 and 63 cos from what I can find online those are for audio related functions.

This has been bugging me for a few days now. Thanks so much in advance!
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Last edited by FatboyDean; 07-18-2026 at 01:32 AM..
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