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Thread: Wiring Diagram for A/C System?

  1. #1
    Senior Member jaymanek's Avatar
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    Wiring Diagram for A/C System?

    Hi All,

    Does anyone have a wiring diagram for the A/C System.

    On the 500TE project, my A/C compressor isnt kicking in. I suspect I have cut a wire that is required on the part of the harness that goes inside the car to the heater control panel.

    On the original 320TE wiring, the A/C compressor has its own control unit. the 500E has no such control unit?

    I havent yet tested if I have 12V power to the compressor as I am pretty sure the issue will be on the wiring inside the car.
    I cut out the wires that were to do with heater and A/C as I was planning on keeping the original loom for the A/C heating etc.
    I didnt realise the A/C pump may need a feed from this area.

    Luckily I still have all parts of the loom that I cut... in a giant tangle, in a box somewhere...

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    Re: Wiring Diagram for A/C System?

    It should be in the electrical subsection of the 124 manual posted in the factory manuals section. You do have access to that, no?

    IIRC, the 3.2 liter/facelift W124 still uses a Klima relay underhood; I believe this function is covered by the "Basic Module" on the E500E. Totally different electrical setup.

    There is no specific A/C control relay/unit on the E500E. The Klima relay is one of the last vestiges of the old-school 1980s designs as seen in the W126 et al.

  3. #3
    Senior Member jaymanek's Avatar
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    Re: Wiring Diagram for A/C System?

    I have checked on WIS but the wiring diagrams don’t cover the 036.. I tried looking at diagrams for r129 but that doesn’t seem to match up either..

  4. #4
    .036 Hoonigan™
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    Re: Wiring Diagram for A/C System?

    From memory... the AC compressor is controlled by the KLIMA relay in the wagon.

    In the E500E, that function is embedded in the Basic Module / General Module in the CAN box.

    All the wiring diagrams are in the FSM / CD-ROM, but it may require some digging to locate them. Also, there are some additional diagrams in a separate folder on the CD-ROM which may be needed; I don't know if everything will be in the main ETM.

    Dave M.
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    Senior Member jaymanek's Avatar
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    Re: Wiring Diagram for A/C System?

    Where can I get this CD please?

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    Re: Wiring Diagram for A/C System?

    Quote Originally Posted by jaymanek View Post
    Where can I get this CD please?
    Look for the green text on the main forum home page, you should see it......

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    .036 Hoonigan™
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    Re: Wiring Diagram for A/C System?

    Also online here: http://www.w124-zone.com/downloads/M...W124/Main.html

    If you want ISO files to burn discs or mount the images, shoot me a PM.


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    Senior Member jaymanek's Avatar
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    Re: Wiring Diagram for A/C System?

    Thanks, im looking through, seems like the wiring diagram is not there for the 036 but ill try and piece it together.

    If the Base module controls the A/C compressor, I should be able to figure the rest.

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    Re: Wiring Diagram for A/C System?

    Have you tried the Electrical Troubleshooting Manual?

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    E500E Guru JC220's Avatar
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    Re: Wiring Diagram for A/C System?

    Jay,

    This is a great site for w124 wiring diagrams that I always use & find accurate: (The link below will take you to a 1992 500E index - you can also find your 124 estate in there after & compare)

    http://www.autolib.diakom.ru/CAR/Mer...NG%20DIAGRAMS/
    1987 w124 200 E36 AMG Project car - ongoing 1990 w124 300E-24 Fully Restored
    1992 w124 500E Rolling Restoration - ongoing 1994 C124 E320 - Recently acquired resto project
    2007 w211 E220CDI Avantgarde Daily Driver
    Parted out myself- 95 C36 AMG / 95 E250D / 98 w124 India E220

  11. The Following 2 Users Say Thank You to JC220 For This Useful Post:

    gsxr (2 Weeks Ago), sheward (2 Weeks Ago)

  12. #11
    Senior Member jaymanek's Avatar
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    Re: Wiring Diagram for A/C System?

    JC220 Thats it!!! Perfect, exactly what I needed.

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    JC220 (2 Weeks Ago)

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    Senior Member jaymanek's Avatar
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    Re: Wiring Diagram for A/C System?

    Thanks all, sorted. One required wire wasnt connected in fuse box.

    Connected the wire and all is ok now.

  15. The Following User Says Thank You to jaymanek For This Useful Post:

    gsxr (2 Weeks Ago)

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