The radio buttons will not illuminate when headlights are turned on. I have the factory touch screen gps and 6 disc changer. Everything in the car lights up correctly except the radio. The radio itself works fine and lights up without headlights on. Occasionly the radio will light up but is very rare and tends to do so in colder weather. I have checked the connections to radio wiring harness and all grounds and all apear to be good. Any ideas?

 

Did you ever figure it out? I have an 01 cl with the 6 disc and nav system an I’m having the exact same issue