I WAS BCKNG OUT OF A PKNG SPOT BETWEEN 2 CARS AND THE BACK UP CAMERA SHOWED LOTS OF SPACE. I MADE SURE THE RIGHT OF MY VEHICLE WOULD NOT HIT PARKED CARS I WAS CLEAR ON THE LEFT. I BACKED UP A FEW INCHES AND HEARD GLASS BREAK AND TAPPED THE BEIGE BRICK WALL. UNTIL IMPACT THE SENSORS DID NOT LIGHT UP OR BEEP AT ALL. AT THE POINT OF IMPACT IT WAS FRENZY BEEPING. A WITNESS SAW THE INCIDENT AND WE WALKED BEHIND THE VEHICLE TO SEE DAMAGE. BECAUSE THE REAR LIGHTS AND BRAKE LIGHTS STICK OUT FURTHER THAN THE BUMPER THE LIGHTS ARE DAMAGED. I TOOK IT TO THE DEALER THE NEXT DAY, TMO CAME OUT TO LOOK AT MY ISSUE. HE TESTED THE BACK UP WITH AN EMPLOYEE STANDING BEHIND THE SAME SENSOR. IT DID IT'S JOB AND STARTED BEEPING AT APPROX A FT. FROM THE EMPLOYEE WHO WAS WEARING DARK UNIFORM CLOTHES. I WAS DISMISSED THAT THEY COULDN'T TEST THE SENSOR BECAUSE IT WAS DAMAGED (WHY WOULD AN EXECUTIVE PUT AN EMPLOYEE BEHIND THE SAME "DAMAGED" SENSOR THAT WORKED? I ASKED TMO OK HUMOR ME AND BACK INTO THAT BEIGE WALL OVER THERE - HE SAID TO GET IN,PASSENGER. HE PROCEEDED TO BACK INTO THE WALL, NEITHER LIGHTS NOR SENSOR LIGHT UP OR BEEPED. I LOOKED AT THE CAMERA LOOKED LIKE LOTS OF ROOM LEFT. I TOLD HIM TO KEEP GOING - SEE HOW CLOSE YOU CAN GET. HIS ANSWER WAS NO, MAYBE YOUR RIGHT IT DOESN'T DETECT LIGHT COLOR OBJECTS. CALL CONSUMER AFFAIRS AND TELL THEM. CONSUMER AFFAIRS BRANDON CALLED TODAY, HE SAID TO HOLD WHILE HE CALLED THE DEALER TO GET AN INTERNAL SPECIALIST SCHEDULED TO CHECK OUT THE SENSOR WITH TH