I have a 2009 smart Cabriolet with a model 10 radio with silver trim.i searched but did not find anything but i thought i remember seeing something saying the radio knob was lighted. if it is i don't know mine has been painted
When the parking or headlights are turned on, the radio on button is illuminated. Picture below
When the parking or headlights are turned on and the radio is turned on, all the radio buttons illuminated.
I hope this helps.
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