The blindspot modules are put behind the wheel well in the bumper exposed to the elements. Water gets in these modules and cause them to swell and fail. Each module is sold at the dealer for $340 a piece and gm recommends you replace both along with the wiring harness. This job if done at the dealer is costing consumers $1300-$1600. If you replace the modules yourself then the dealer charges you a programming fee of $195-$215 in my area. This is a design flaw and other GM vehicles like the Acadia have a recall. Why dsnt the Chevrolet Traverse have the same?