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so I have searched the threads and cannot find anything on the lights for each button not working. I found the dim HVAC thread but that is not my issue.
If this issue is isolated to the HVAC and not any of the other gauges radio etc maybe you have a buddy in the area with a C5 that would let you use there known working unit to see if its a issue with the HVAC Control or something else in the car.
Consider messaging TStar as he is probably one of the most knowledgeable members we have in regards to HVAC electronics in our cars.
Mine don't seem to work at all either. The A/C itself works just fine and both digital displays work, but none of the buttons are lit.
First i noticed it as I haven't been driving it after dark or it has been warm enough that the system was off since the top was down.
it is only the lights that should come on when the dash lights are on. when you push the button to activate the smaller round light comes on and everything works.