Hello I am new to the forum. I own a 96 S320 and my climate control panel doesn't work none of the buttons light up or work but if I press the "rest" button the unit comes on but only the rear defrost button works and lights up and I can adjust temp on the screen but doesn't turn anything on....all other buttons does nothing, wont even light up. I can hear the blower but fan speed button does nothing.....What could be wrong? I even tried a new/used climate control panel, and it does the same thing...What could be wrong??