No lights on air conditioning switch at night

[wuxiao0715]

Hi, Thanks for your response.

At the second I saw your comment, I went to the car and tried again. It still doesn't work and seems like the dimmer rheostat is bad or unplugged. I want to fix this, is this expensive? Or I can repair by myself?

Originally Posted by CTScott

If the brightness of the instrument cluster lights does not change when you adjust the dimmer rheostat, then either your headlights are not on (the headlight switch needs to be on to trigger the illumination of the AC knob lights) or the dimmer rheostat is bad or unplugged.