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Thread: Transmission error code. (e34 535ia)

  1. #1
    Join Date
    Feb 2006
    Location
    Norway
    Posts
    461

    Default Transmission error code. (e34 535ia)

    Hi.

    I recently bought a 1988 535i(a)

    It was originally an automatic transmission, but the gearbox failed, and the PO got the car rebuilt with an manual 5 speed box.

    Now the OBC in dash display says "transmission error" Wich makes perfectly sense as the automatic transmission is long gone.. How do I make the message go away?
    Eurospec-12/1988-535iL-M30B35-5speed

  2. #2
    Join Date
    Jan 2004
    Location
    Albuquerque, NM
    Posts
    953

    Default

    Simple fix. Take the cover & speaker out of the passenger (right) side footwell. The TCU (transmission control unit) is tucked inside above the speaker. Unplug the connector and identify which socket is pin # 33. The pin numbers are molded into the plastic on the TCU. Cut down a spade connector so it's narrow enough to fit into the socket and crimp a wire to it and tape it onto the connector and tie the other end of the wire to a good ground. The message will go away and there will be a permanent "S" in the dash gear indictor, which can be removed by taking the bulb out.

    Last edited by gale; 01-06-2008 at 12:33 PM. Reason: (added jpeg)
    gale
    92 735i 5-spd, turbo project finally underway!


  3. #3
    Join Date
    Feb 2006
    Location
    Norway
    Posts
    461

    Default

    Thanks!

    So to wrap it up:
    Connect pin 33 in the TCU harness to ground.

    I dont think i have a gear indicator in the dash? How should it look like?
    Eurospec-12/1988-535iL-M30B35-5speed

  4. #4
    Join Date
    Dec 2004
    Location
    Sydney, Australia
    Posts
    4,353

    Default

    Quote Originally Posted by Espen
    Thanks!

    So to wrap it up:
    Connect pin 33 in the TCU harness to ground.

    I dont think i have a gear indicator in the dash? How should it look like?
    It is a dotmatrix LCD window in the cluster on teh right lower side. In the right light might show an S very faintly. (The bulbt is probably already blown or removed).

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    08/88 535i e34 M30+miller MAF, 'stiens, tints & teeth!

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