A/C wiring for s52 e30 - anyone know how?

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  • Sh3rpak!ng
    R3VLimited
    • Jan 2014
    • 2667

    #1

    A/C wiring for s52 e30 - anyone know how?

    What I'm working with:
    1989 e30 325i
    1998 e36 OBDII harness (I am retaining OBDII)

    I have looked through the e30 etms for the heating and air conditioning (6410-0), A/C temp controls (6411-0), A/C blower controls (6413-0), A/C air delivery control (6421-0), and A/C compressor controls (6452-0) and I couldn't figure out much that seemed to correspond with the e36 harness.

    The ETM for the e36 harness leads me to this:
    x20 pin 4 - (black/blue) DME to compressor control relay
    x20 pin 5 - (black/gray) DME to normal speed relay/pressure switch
    x20 pin 6 - (violet/gray) DME to climate control module

    How much of the e36 wiring do I need for A/C? My initial thoughts are that the only "integration" needed is for the idle control? so when the compressor kicks on the idle is bumped up?

    Does the e30 control the rest via a separate harness for A/C?

    Thanks
    '89 325i OBD2 S52 BUILD THREAD
    Shadetree30

  • Sh3rpak!ng
    R3VLimited
    • Jan 2014
    • 2667

    #2
    Here is another thread I found, although it looks like there was never a resolution

    '89 325i OBD2 S52 BUILD THREAD
    Shadetree30

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    • nine9six
      Noobie
      • Mar 2011
      • 21

      #3
      I realize this is from 2015 but have anyone figured out the wiring for an ODB2 swapped s52 for Air Conditioning? I seem to see some ODB1 wiring diagram but not ODB2.

      95 M3 - Powerdyne supercharger, WAR Chip, Ground Control Track/School coilovers, Eibach Sways, Dinan Exhaust, UUC SSK

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      • bimr84
        Noobie
        • Apr 2016
        • 37

        #4
        I can help if anyone needs it. Requires wiring a relay for the m52/s52 ac wiring. Feel free to message me here or on IG bimr84

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