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f32 4 Series coupe - No sound from speakers, sos call system failure and no warning tones message

  • 15-01-2023 12:20am
    #1
    angs12
    Registered Users Posts: 1 ✭


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    hey all, i have a warning message on the screen (no warning tones). Also have the SOS call system no working message. I did some research and found out about the fibre MOST ring.


    Diagnosing done so far:


    • Checked the amplifier in the boot and it has a red and amber light. Took out the fibre cable and i can see the red light on it, which means the connections is passing onto the amp. - - Tried bypassing amp using a bypass loop
    • replaced the battery with a new one
    • Hooked up ISTA and i can see the COMBOX ecu not responding (picture attached)
    • Checked the COMBOX (tematics control unit) there is no fibre cable going to it it seems. So i cannot bypass it.


    as per my research it could be the amp too, but i can see the lights in the amp.


    Just asking for help before i try replacing the COMBOX, i dont understand how it can just stop working, or maybe thats a red-herring?


    attached fault codes from ISTA


    any help really appreciated before i give up and bring it to the dealer $$$



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