I STARTED TO REVERSE AND AS ALWAYS THE BACKUP CAMERA VIEW CAME ON THE DASHBOARD. I WAS WATCHING AS I BACKED OUT OF MY PARKING SPACE. MY WIFE FELT IT WAS VERY HOT IN THE CAR AND SHE TURNED ON THE AC. THAT SWITCHED MY BACKUP CAMERA VIEW ON THE DASHBOARD WHILE I HAD PULLED MY CAR HALF WAY. I WAS THEN DRIVING BLIND AS I PULLED OUT WITHOUT THE CAMERA VIEW ON THE DASHBOARD. I DIDN'T HEAR ANY "STOP" SIGN OR ANY AUDIBLE SOUND TO STOP BEFORE I HIT THE BUS BEHIND.