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2002 Chevy trailblazer

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07 Feb 2019 02:39 #26840 by Fordman
2002 Chevy trailblazer was created by Fordman
I just bought a 2002 Chevy and the electronic 4 wheel won't engage when u push the button. Does anyone have a wiring diagram so I can trouble shoot my problem?

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07 Feb 2019 09:02 #26851 by pole71
Replied by pole71 on topic 2002 Chevy trailblazer

"Knowledge is a weapon. Arm yourself, well, before going to do battle."
"Understanding a question is half an answer."
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07 Feb 2019 13:21 #26857 by chief eaglebear
Replied by chief eaglebear on topic 2002 Chevy trailblazer
wow this one looks interesting I think I would start with establishing 5 volts to switch from transfer case module any moderators or experienced technicians have any input on where to start

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08 Feb 2019 07:07 #26873 by Tyler
Replied by Tyler on topic 2002 Chevy trailblazer
Congrats on the new (to you) Chevy!

Codes and scan data are definitely the place to start with these systems. ;) If you don't have a scanner, then at least a code read from the Transfer Case Shift Control Module would be helpful.

Encoder motor potentiometer issues are commom, but not common enough that I'd suggest throwing one at it. :lol: If you can't get codes or data, then we can suggest some voltage tests at the shift control switch and the encoder motor.
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11 Feb 2019 12:13 #26964 by Fordman
Replied by Fordman on topic 2002 Chevy trailblazer
Thanks for the replies anyone have a description of how the system works

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11 Feb 2019 13:47 #26971 by Tyler
Replied by Tyler on topic 2002 Chevy trailblazer

Fordman wrote: Thanks for the replies anyone have a description of how the system works


The TCSCM provides 5V to the range switch, and the switch pulls that down to varying voltages depending on the switch position. Once the requested range is achieved, the TCSCM lights the corresponding LED on the switch. i.e. you asked for 4HI, the TCSCM moves the transfer case around, then lights the 4HI LED when it gets there.

When a range is requested, the TCSCM spins the transfer case motor in either direction while watching the encoder voltage (the encoder corresponds to transfer case position). Once the encoder voltage reaches the desired point, the motor is stopped.

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