You know that little device that controlls your brightness in your instermenpanel like where your speedo is? They didn't connect it properly, When not connected properly it does'nt work! Take it back or, take off your AC/Heater control panel and re check your connections.
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<img src="http://www.teletracks.com/images/logos/enemy_gates.gif" border=0>
Squeeze the trigger, don't pull it...