Nope... but I would if their bulbs had blown, and the radio head unit control buttons are variable resistors not a switch, the head unit looks for the variance in resistance and acts accordingly.
Ok cheers Discool just thought there might be something technical in with in the dash all the fuses are fine I've learnt to ask before taking things apart lol.
Yer I've had them apart to take the bulb out but one was missing the 4 switches on the right light up but the left don't just wondered if there was a technical difference or simply buy bulbs