Transistor Identification

[pbr333]

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

[eccerr0r]

Re: Transistor Identification

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

[pbr333]

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.

[pbr333]

Re: Transistor Identification

I attached circuit diagram and pic of module.

[stj]

Re: Transistor Identification

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

[fzabkar]

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