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Chassis Harness - m42 specific

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    Chassis Harness - m42 specific

    I put this in the m42 section because everywhere else I've asked I'm being told answers that don't person to m42 cars...cruise control wires or other stuff that m42 cars didn't have. So its aimed specifically at m42 cars even though it's not engine related.

    I started a restoration 5 years ago, and when I ripped the harness out, I pulled these two grommets out of the main firewall grommet (see photo #1). It appears there would be 3 circuits going from under the dash into the engine bay, however I can only remember one, the outside air temp sensor. Can someone take a look at their car and determine what the other two circuits are that populate these grommets?

    I Removed everything associated with the airbag system, computer, sensors, etc, so that very well could be what was in these.

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    Last edited by jrobie79; 01-03-2025, 03:50 PM.
    1991 318is --- currently not road worthy
    1991 318i ---- 308K - retired

    Originally posted by RickSloan
    so if you didnt get it like that did you glue fuzzy oil to the entire thing?

    #2
    To my knowledge it was the airbag harness and the ambient temp harness.
    1989 Hooptie 325iS Build Thread
    1989 Zinnoberrot M3 Build Thread

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      #3
      I can't see the photos but would take a look at my car for you if you can make them work. It is M20 swapped but I never did anything to the chassis wiring (other than the ambient temp sensor getting ripped off when a puddle knocked my brake duct out years ago)

      IG @turbovarg
      '91 318is, M20 turbo
      [CoTM: 4-18]
      '94 525iT slicktop, M50B30 + S362SX-E, 600WHP DD or bust
      '93 RX-7 FD3S

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        #4
        Originally posted by varg View Post
        I can't see the photos but would take a look at my car for you if you can make them work. It is M20 swapped but I never did anything to the chassis wiring (other than the ambient temp sensor getting ripped off when a puddle knocked my brake duct out years ago)
        Check now
        1991 318is --- currently not road worthy
        1991 318i ---- 308K - retired

        Originally posted by RickSloan
        so if you didnt get it like that did you glue fuzzy oil to the entire thing?

        Comment


          #5
          Click image for larger version  Name:	20250103_171847.jpg Views:	0 Size:	198.8 KB ID:	10133110

          AWDBOB had it right.

          Red is airbag sensors.
          Yellow is ambient air sensor.
          Last edited by uturn; 01-03-2025, 05:00 PM.

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