Climate controls not working

2003 CHEVROLET VENTURE
220,000 MILES • 6 CYL • 2WD • AUTOMATIC
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SEVEN6TWO
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  • 1 POST
The only control that is still working on the climate control board is the fan speed. I can no longer change which vents the air blows through nor change from hot to cold. The A/C and rear defrost buttons no longer lights up or work either.

I ordered a new climate control board from eBay but that did not fix it. All fuses are okay.
May 31, 2021 at 12:12 PM
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ASEMASTER6371
  • CERTIFIED EXPERT
  • 52,796 POSTS
Good evening,

I attached a wiring diagram for you to view. You need to test for power to the climate control unit on the orange wire at the connector. That wire is powered by the radio fuse that I circled. Without this power, the unit will not work.

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

https://www.2carpros.com/articles/how-to-check-a-car-fuse

https://www.2carpros.com/articles/how-to-use-a-voltmeter

I also attached the ground location for you as well. Check this ground for being clean and tight.

Roy
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May 31, 2021 at 7:25 PM
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KASEKENNY
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  • 18,907 POSTS
This could be a couple things. We need to start with checking the voltage coming out of the control module.

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

I attached the wiring diagram below. Can you back probe each wire and operate that system and tell us what the voltage is coming out of it?

Also, after you replaced the control board, what this the entire assembly or just the circuit board of the unit? Can you get a picture of the part that you removed just so I can get on the same page as you for what you replaced?

Thanks
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May 31, 2021 at 7:29 PM
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