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  2. General W-Body Discussion

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  3. Specialty Forums

    1. Turbo Grand Prix

      This forum is for enthusiasts of the rare 1989-90 Pontiac Grand Prix Turbo.

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      A forum for information and discussion about the Oldsmobile Cutlass Supreme Convertible

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  • Posts

    • 01 monte fan
      Wiring diagram explain please

      By 01 monte fan · Posted

      Yes I can disconnect it from the bcm. That method I believe is totally doable.  I don't think that there would be any issue with leaving the bcm plugged in... If it's to supply 12v then it shouldn't matter if it's producing it via another method... as long as we aren't putting voltage where it shouldn't be right? I might have time tonight to try that, otherwise I will definitely do it tomorrow. If it does turn out that its the bcm, how best and cheapest method to get it flashed? I have been thinking of investing into a new scan tool that can flash and read deeper into the cars systems. I also have a 2014 traverse and it would definitely be nice to be able to deep dive into any issues it might arise. Thank you for helping me with this issue!! I really can't thank you enough for all of your knowledge and assistance here.
    • GnatGoSplat
      Wiring diagram explain please

      By GnatGoSplat · Posted

      Are you able to unplug it at least?  If so, possibly an easier way is to take a small piece of wire and wrap it around the terminals of the relay corresponding to L3 and N3, then plug it in.  That will keep N3 powered at all times.  I suggest unplugging connector C2 of the BCM just in case backfeeding +12V into the Load Management pin is bad for it.
    • 01 monte fan
      Wiring diagram explain please

      By 01 monte fan · Posted

      Ooooh! Great idea, I will try that and see.  Any suggestions on how to do this? I have very little play in moving that connection around to really be able to see and get a jumper wire stuck into each point...
    • GnatGoSplat
      Wiring diagram explain please

      By GnatGoSplat · Posted

      Sounds like the BCM might be defective. Not 100% sure if the HVAC panel works with BCM disconnected, but you could try unplugging connector C2 from the BCM and use a piece of wire to jumper B8 to A1, see if the rear defogger relay will switch on.  If it does, that will be 100% confirmation the BCM is defective.  
    • 01 monte fan
      Wiring diagram explain please

      By 01 monte fan · Posted

      Ok, so I located the orange wire off the bcm and only got .49v with key on.
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