Hi,
Based on your description, it sounds like the HVAC control module (component with the switches) has failed. However, we need to check for power to it first.
If you look at the first two pics below, it shows the wiring between the power supply and the module. Check the fuses I highlighted. In addition to checking the fuses, confirm they are getting power to and from them.
Here is a link you may find helpful:
https://www.2carpros.com/articles/how-to-check-a-car-fuse
If they check good, we need to have the can-bus scanned to confirm the issue is from the module. CAN stands for controller area network. Basically, the different modules in the vehicle are attached by a few wires. This type of scan will retrieve codes regardless of the module storing them. If there are codes related to the HVAC module, it will show up.
Here is a link that explains how this is done:
https://www.2carpros.com/articles/can-scan-controller-area-network-easy
Let me know what you find.
Take care,
Joe
See pics below. Pics 3 and 4 show the fuse locations in the fuse boxes.
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Wednesday, October 26th, 2022 AT 7:27 PM