GMC'S CAMPAIGN NUMBER IS 12180 FOR THIS ISSUE BUT WHEN I CALLED THEY SAID I WOULD HAVE TO PAY FOR THE DIAGNOSIS AND REPAIR MYSELF. DRIVERS SIDE POWER WINDOW AND DOOR LOCK SWITCH STARTED RAPIDLY CLICKING AND SMOKING CAUSING DOOR LOCK CONTROL NOT TO WORK AND WINDOWS UNABLE TO ROLL DOWN TRAPPING PASSENGERS IN VEHICLE. SWITCH STARTED WORKING AGAIN THE NEXT DAY BUT IS NOW NOT WORKING OR PARTIALLY WORKING AGAIN. FUSE DID NOT BLOW. IF THIS SWITCH IS USED BY ACCIDENT IT WILL MAKE THE OTHER WINDOW SWITCHES NOT WORK FOR AN EXTENDED PERIOD OF TIME AND THEN THEY RANDOMLY START WORKING AGAIN. I HAVE SEARCHED THIS ISSUE ON THE INTERNET AND FOUND MODEL YEAR 2006 GMC ENVOY AND TRAILBLAZER HAVE MANY REPORTS OF THIS ISSUE SINCE THEY WERE FIRST SOLD IN 2006 AND 2007. *TR