I bought my GMC Terrain used and 1,000 miles. After a bumper to bumper accident several thing stopped working. First the rear hatch stopped opening. The wiper on it also stopped working along with the front right blinker, left rear blinker and brake light plus the interior outlets and the red lighting around the drive controls. I went to the dealership and paid them to do a diagnostic on the truck. They told me it needed a Body Control Device. So I had them install it, and it didn't fix a thing. So now I'm back to where I started. Do you know what might be wrong? Thank you.
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