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No power at the HVAC module?

Tiny
XCAPER
  • MEMBER
  • 2016 CHEVROLET MALIBU
  • 2.5L
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 175,000 MILES
I have a late model 2016 Malibu.
There is no power in the HVAC control. Nothing lights up or turns on.
All fuses are good

On the 4 pin @ HVAC controller.
Black ground is good.
Red power 12.5 volts at all times Yellowish 11.5 power at all times.
Green power on key at 1.5 - moving range.

Any help is greatly appreciated.
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Thursday, August 17th, 2023 AT 12:57 PM

1 Reply

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,363 POSTS
It sounds like the HVAC controller went bad. To be sure we need to check all 15 fuses that run the system. I have included the wiring diagrams for the HVAC system so you can see how the system works and which fuses to check. Please test the fuses with the key on.

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

If the fuses are okay, we should do a CAN scan. You can get a CAN scanner (Controller Area Network) which will work on most cars from Amazon.

Here is a video to show you how:

https://youtu.be/u-4syLc-ifQ

Here is how to change out the HVAC controller if you need it. Check out the images (below). Please let us know how it goes.
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Friday, August 18th, 2023 AT 10:34 AM

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