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Thread: OBC IV pinout details

  1. #1
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    Default OBC IV pinout details

    OBC IV Pin-out
    ---
    pin1: violet/green/yellow, alarm system
    pin10: black/green, starter
    pin6: + from fuse F17
    pin9: + from fuse F20 (red/yellow)
    pin8: + from fuse F1
    pin22: grey/red, light switch
    pin25: yellow/red, turn signal switch
    pin3: white/yellow, diagnostics
    pin16: white/violet, diagnostics
    pin14: white/grey, instrument cluster
    pin7: black/white, instrument cluster
    pin4: ground
    pin5: blue/red/yellow, temp sensor
    pin20: black/red/yellow, pre-ventilation
    pin21: black/white, pre-ventilation
    pin23: violet/white/yellow, alarm system
    pin17: red/grey/yellow, alarm system
    pin26: black/red/yellow, fuel tank level sensor
    pin12: brown/violet, fuel tank level sensor
    pin11: white/black, DME
    pin24: black/violet, DME
    pin19: white/red, chimes
    pin18: white/blue, chimes
    pin15: white/brown, radio
    pin2: blue/brown/yellow, radio

  2. #2
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    Anyone know which OBC I need

    65811384149

    or

    65818351055

    I took the OBC out today to change the bulb as the writing on the OBC was not lighting up to find out that the metal ring that is suppose to be in the housing in the bottom of the OBC was missing so even though there was a working bulb in there...there was no light...

    So I have been looking on eBay for a replacement....worth it?!
    http://www.bimmernut.com/forum/image.php?type=sigpic&userid=3314&dateline=1239168  877

  3. #3
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    did you enter both numbers into the parts number cross reference ?
    http://www.realoem.com/bmw/select.do?lang=en

  4. #4
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    Quote Originally Posted by shogun View Post
    did you enter both numbers into the parts number cross reference ?
    http://www.realoem.com/bmw/select.do?lang=en
    I actually got both of them from realoem.com

    Would I be better off taking mine out and reading the number on the back? I just want to make sure what I buy will be compatible in my car
    http://www.bimmernut.com/forum/image.php?type=sigpic&userid=3314&dateline=1239168  877

  5. #5
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    if I remember correctly all E32 do have a coding plug in the backside of the OBC. (?)
    On some E34 models the OBC needs a coding plug in the backside.
    It maybe that this is only necessary on the EURO models which partly do not have a check control.
    That is shown here with the coding plug installation
    http://www.gunnar525.de/screwings/bc...ierstecker.pdf
    another 56 pages instructions how to install a OBC, and it also shows all things which were available such as the clock, OBC III etc
    http://www.gunnar525.de/screwings/bc4_einbau.pdf
    FAQ OBC in German
    http://www.gunnar525.de/screwings/bc4_faq.pdf
    but I assume that in the U.S. models there were only OBC III and IV and all have the coding plug, so both should fit, but no guarantee

  6. #6
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    Quote Originally Posted by shogun View Post
    if I remember correctly all E32 do have a coding plug in the backside of the OBC. (?)
    On some E34 models the OBC needs a coding plug in the backside.
    It maybe that this is only necessary on the EURO models which partly do not have a check control.
    That is shown here with the coding plug installation
    http://www.gunnar525.de/screwings/bc...ierstecker.pdf
    another 56 pages instructions how to install a OBC, and it also shows all things which were available such as the clock, OBC III etc
    http://www.gunnar525.de/screwings/bc4_einbau.pdf
    FAQ OBC in German
    http://www.gunnar525.de/screwings/bc4_faq.pdf
    but I assume that in the U.S. models there were only OBC III and IV and all have the coding plug, so both should fit, but no guarantee
    I'm not sure about this, but...

    Isnt it something like - all the bosch DME versions 1.x dont support the obc natively and require the plug? M20/M30/M70? (Though I'm not sure about how the E31 does it, the "E36 style" OBC must have some sort of built in coding...)

    Anything 2.x or 3.x will support the OBC straight away?

    The exception to this is the Diesel models, which always require a coding plug.

  7. #7
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    Both my M20 and M30 models dont have an OBC coding plug. The M50 525 model that I work on doesn't have one either.

    I thought that all low models (518, 520 and the diesels) had to have the code plug for the OBC.

  8. #8
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    what is this coding plug?

    would I be safe with any OBC IV?
    http://www.bimmernut.com/forum/image.php?type=sigpic&userid=3314&dateline=1239168  877

  9. #9
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    Some more info, the differences are shown here, click on Bordcomputer IV http://www.pet-racing.de/E34
    Based on EURO spec cars:

    1 ) BC ohne Codierstecker ab 525i Benziner aufwärts = OBC without coding plug 525i gasoline engine and up

    2) BC mit Codierstecker für 520i und 525td/s (auch 518i und 524td jedoch nie ab Werk) - bei nicht eingestecktem CS gleiche Funktion wie BC Nr. 1 = OBC with coding plug for 520i and 525td/s (also 518i and td, however never shipped with it ex factory) -in case coding plug is not installed, same function as under 1)

    3) Umgebauter BC mit nachgerüsteter Codiersteckerplatine über eingelötete Stiftleiste im inneren = converted OBC with additionally installed coding plug board via soldered in pins inside

    4) Eine meiner Varianten eines umgebauten BC mit EEPROM und passendem IC-Halter auf der Rückseite = one of my versions of a converted BC with EEPROM and fitting IC-bracket at the backside

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