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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > AUDIO/VIDEO + BLUETOOTH + Electronics/Alarm/Software > SOS Malfunction with No Sound / Chimes - Cannot Diagnose



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      04-28-2021, 12:00 PM   #23
ctuna
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The cables don't Fail the Most Bus modules Fail.
As far as cable's failing there have been a couple of cases of
Rodents eating into them .
Sos failure and no sound are the common symptoms.
When one module fails on the Most Bus all the others cease to function
because it is a Ring Bus and the failing module breaks the Ring.
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      05-08-2021, 08:30 AM   #24
LivinLrge
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Thank you for the guide. ctuna

Worked perfectly and ended up being the last connector under the driver side panal..it was simply disconnected. It is a short wire and if you take to be scanned it seems it was not plugged back in...

Also a note on the amp led color, it is YELLOW and there is a red power indicator to the right of the blinking led, which for most people would be caution but the amp is working just fine as long as it's blinking.

I would check the cable under the dash first before dismantling your trunk as the dash wire took 5 mins and removing the amp and panels in the trunk took about 30.
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      10-22-2021, 09:06 PM   #25
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I know this is an old thread. My radio only works in accessory mode. Has anyone experienced this?
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audio, chimes, malfunction, most system, no sound, sos

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