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Thread: Stock Head Unit - Power Antenna, speaker issue

  1. #1
    Join Date
    Dec 2015
    Location
    El Sobrante, CA
    Posts
    10
    My Cars
    1987 BMW 535is

    Stock Head Unit - Power Antenna, speaker issue

    Hi All,

    My 87 535is has the stock bmw radio/cassette player. The power antenna motor kicks on, but the telescoping mast has been long since been broken off.

    I was able to find the radio code cryptically written in roman numerals on the service manual that came with the car. I punched the code in, and the radio unlocked itself. I was not expecting to have any fm or am reception whatsoever, but I was expecting to hear some static. Instead nothing, the radio operates like it should be playing, responds to commands and such. I popped a tape into the deck, and it seemed to functioning, just no sound. I play with the rolling switch to left which I believe is the fader for these cars, and nothing. I'm pretty sure there is not a separate fuse for the speakers alone, but I guess I could be wrong, those Bavarians had interesting ideas about a common ground system for speakers.

    Is it more likely the unit is just hosed? Or is there a stereo module somewhere that I am not finding? My Bentley manual is on order.

    Thanks,

    Joe

  2. #2
    Join Date
    Feb 2011
    Location
    Wichita Falls, Texas
    Posts
    1,039
    My Cars
    1997 BMW Z3 2.8
    Would it be possible to hook the radio up to other speakers as another test?

  3. #3
    Join Date
    Mar 2008
    Location
    PA
    Posts
    69
    My Cars
    Lada 250
    The booster module is above the RH wheelhouse. It is known to fail.

  4. #4
    Join Date
    Dec 2015
    Location
    El Sobrante, CA
    Posts
    10
    My Cars
    1987 BMW 535is
    My amp is mounted on a bracket in the trunk just under left side of the back cash. I've surmised it to be dead - checked the schematic and tested the wires. The unit is getting power and a turn on signal but is not coming on. I think it's toast. Between that and the power antenna, it's pretty much time to consider a rewire and upgrade.

  5. #5
    Join Date
    Oct 2008
    Location
    Kettering,OH
    Posts
    5,128
    My Cars
    e34 535i and 98 528i
    I have a good rear amp in the trunk.

    Andy

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