CADILLAC\CHEVROLET\GMC SERVICE CAMPAIGN: SEE DOCUMENT SEARCH BUTTON FOR OWNER LETTER. ON CERTAIN 2009 MODEL YEAR VEHICLES, THE RAINSENSE 11 WIPER FEATURE MAY BE INOPERATIVE. THESE VEHICLES MAY HAVE BEEN BUILT WITH INCORRECT SOFTWARE THAT WILL NOT AUTOMATICALLY ACTIVATE THE WIPERS WHEN MOISTURE IS DETECTED. *PE
