Jeremiah is correct because I foolishing followed the advice from the "expert" who said replace the circuit board behind the mode buttons. problems came back, here is how to fix mode buttons not lighting up:
The air mode buttons stopped lighting up again even after swapping the motherboard behind the buttons. I learned the real reason is likely the air mode actuator, which is a module under the steering wheel nearest the center of the dash, it is like the cruise control module in size. you may need to remove the fuse box and there are about 2 screws holding the bottom dash panel under the steering wheel in place. you might not need to remove it but it helps you see. the air mode actuator has a green connector you need to disconnect and there should be 2 push rods connected to the box, just like on your power door locks., inside you want to clean the contacts and grease off and sand the contacts lightly . you will regrease with silicone grease like sil glyde from Napa . you must also bend the fingers up which contact the rotary gear which has the circuits which the fingers touch, it looks like a circular maze of circuit traces. next bend and sand off the 2 positive and negative contacts on the electric motor so it makes more contact with it's circuit.
there is also the blend door actuator which looks exactly the same but it controls the hot and cold blending
these 2 videos show you how:
https://www.youtube.com/watch?v=CjclEh9pawY&list=WL&index=9
https://www.youtube.com/watch?v=1xKYEcZRppw&list=WL&index=1
Thursday, July 6th, 2023 AT 11:48 AM
