Transistor Identification

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  • pbr333
    Member
    • Jan 2014
    • 14
    • usa
    #1

    Transistor Identification

    I'm trying to find a replacement for these 2 transistors. They are in a shift control module that belongs in my wife's SUV. The one labeled badtrans seems to be shorted (tested in circuit). If I can find a replacement I'll remove from circuit and test it to be sure. Any help would be appreciated.


    thanks, pbr333
    Attached Files
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    • eccerr0r
      Solder Sloth
      • Nov 2012
      • 8701
      • USA
      #2
      Re: Transistor Identification

      Might have to reverse engineer from the circuit. What brand car?
      A lot of car manufacturers obscure component identification...

        Comment

        • pbr333
          Member
          • Jan 2014
          • 14
          • usa
          #3
          Re: Transistor Identification

          chevy 2001 Tahoe. I believe this motor control circuit in where polarity to motor is switched to achieve transfer case gear change.

            Comment

            • pbr333
              Member
              • Jan 2014
              • 14
              • usa
              #4
              Re: Transistor Identification

              I attached circuit diagram and pic of module.
              Attached Files

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                • stj
                  Great Sage 齊天大聖
                  • Dec 2009
                  • 31009
                  • Albion
                  #5
                  Re: Transistor Identification

                  they are probably fets
                  so pull the working one and stuff it in a component tester.

                    Comment

                    • fzabkar
                      Badcaps Veteran
                      • Mar 2009
                      • 772
                      • Australia
                      #6
                      Re: Transistor Identification

                      D412 is the circuit reference for a diode. The part looks like a dual diode that connects between each motor terminal and the positive supply.

                      The relays do the switching, not the semis.

                      The pinout for the relays is in the following datasheet:
                      https://cdn.badcaps-static.com/pdfs/...856b3dfc11.pdf
                      Last edited by fzabkar; 01-05-2016, 04:36 AM.

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