Instrument cluster not working properly

2006 CHEVROLET TRAILBLAZER
157,658 MILES • 4.2L • 6 CYL • 4WD • AUTOMATIC
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JOHN HOLLMAN
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So my guages stopped working. The check engine light and turn signals still light up and guage needles still light up, but not of the guages register anything. So far I've checked all the fuses with my test light, I replaced the ignition switch and relay, and checked all the grounds. So I ordered a remanufactured cluster from cardone installed it and same issue guages don't register anything. I'm losing my mind over this. Any suggestions are greatly appreciated.
Apr 29, 2021 at 3:23 PM
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KASEKENNY
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I would expect this to be the cluster as well but if you have a second one doing the same thing then we need to move on.

I would suggest starting with checking for codes just to see if we have any communication issues.

https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing

If not, then I suspect we have a PCM issue or possible wiring issue.

Here is a guide that will help with testing the voltage but if you have a test light we need to back probe the pins of the cluster just to see if we have signal coming from the PCM on these wires.

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

Use a safety pin in the connector if your test light does not fit in the connector. Then touch the test light to the safety pin.

Let us know what you find and we can go from there.
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May 1, 2021 at 7:56 AM