Tl* the contact owns a 2007 chevrolet trailblazer. while driving various speeds, the headlights failed to illuminate. the headlights illuminated after restarting the vehicle, but the failure recurred intermittently. also, the interior lights flickered occasionally. the dealer failed to diagnose the problem. the vehicle was not repaired. the manufacturer was notified of the failures. the failure mileage was unknown. ..updated 10/04/16 *bf *tr