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4WD selector switch not lighting up or working

Tiny
CHEVY MAN 1
  • MEMBER
  • 2003 CHEVROLET S-10
  • 99,000 MILES
I had recently had my truck in 4wd and then when switching out of 4wd to 2wd it blinked a few times and then stopped working all together and know it is stuck in 4wd. How do I get it out of 4wd and how do I know if its the transfer case control module or some other electrical problem.
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Saturday, February 25th, 2012 AT 10:22 PM

1 Reply

Tiny
KASEKENNY
  • MECHANIC
  • 18,907 POSTS
More than likely this is an issue with the encoder motor.

The thing we need to do is check the voltage at the encoder to find out if when you are switching from 2WD to 4WD the correct voltage signal is being sent to the encoder.

If it is then the encoder is the issue.

Here is a guide that will help with this testing:

https://www.2carpros.com/articles/how-to-check-wiring

I am attaching the wiring diagram below; however, I suspect you will find the encoder is the issue.

Please run through this info and let me know what questions you have. Thanks
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Saturday, November 13th, 2021 AT 7:07 PM

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