If the power and grounds are good, I would replace the programmer here is the wiring diagrams and the instructions on how to replace it. You might need to get a used unit.
Here is a guide to help test the circuits:
https://www.2carpros.com/articles/how-to-check-wiring
The programmer is used to control the operation of the HVAC system. The programmer/Instrument Panel Module (IPM) is located behind the instrument panel compartment door. The heater and A/C control assembly allow the vehicle operator to communicate with the IPM. The IPM is the component which monitors the HVAC system status and can adjust to meet the requirement set by the operator of the vehicle. The heater and A/C control includes buttons to select operating modes, a fan speed increase/decrease control, the rear defog control button, and a vacuum fluorescent display panel. When the park lamps or headlamps are turned on, the buttons are illuminated.
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Monday, May 15th, 2023 AT 1:20 PM