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Thread: E90 Radio help.

  1. #1
    Join Date
    Mar 2019
    Location
    Peachtree city Ga
    Posts
    6
    My Cars
    2007 328i 2008 528i 1999

    E90 Radio help.

    I have a 2007 328i with standard radio. My issue is no sound. I can confirm the following:

    At the plug on the amp:

    I have confirmed input from the radio head with an external speaker on the following pins per drawing: 8-9,16-17,29-30,37-38. i have sound and can turn up and down the volume (external speaker).

    I have 12 volts at pin 5, and have a good ground at pin 26.

    I have used an external amp to power an play all of the speakers>: pins 3-4,11-12,13-21,22-23,31-32,33-34. All of the speakers produce good sound (Using external source).

    I have swapped the amp with one from used car no help. So bottom line I have input to the amp, I have 12 volts with good ground with no output. Maybe some circuit to kill the sound??? I dont know what pin 10 on the amp is for, it goes to the diversity antenna. Does this sound like a coding issue?

    Help please>>>>

  2. #2
    Join Date
    Jul 2011
    Location
    Arlington, VA
    Posts
    9,933
    My Cars
    2018 BMW M240i
    The amp needs a 12VDC turn on signal from the head unit in order to operate.

  3. #3
    Join Date
    Mar 2019
    Location
    Peachtree city Ga
    Posts
    6
    My Cars
    2007 328i 2008 528i 1999
    Ok thanks for responding. Is that pin 10 coming from the diversity antenna circuit?

  4. #4
    Join Date
    Jul 2011
    Location
    Arlington, VA
    Posts
    9,933
    My Cars
    2018 BMW M240i

  5. #5
    Join Date
    Mar 2019
    Location
    Peachtree city Ga
    Posts
    6
    My Cars
    2007 328i 2008 528i 1999
    You were correct on the turn on signal. I DO NOT have 12 volts out from the turn on signal. Do you think this is a radio head issue or could it be coding??? I jumper pin 5 and 10 at the amp and got sound.

  6. #6
    Join Date
    Jul 2011
    Location
    Arlington, VA
    Posts
    9,933
    My Cars
    2018 BMW M240i
    The grad unit supplies the turn on signal. You need to find out which pin/wire provides the signal. I’m not familiar with the E90 wiring diagrams. Check the E90 section.

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