Customer Questions and Answers for Control Unit by Bosch

Hello Mike, The first thing I always check on these is the wire nut connections in the power junction box on the front right behind the kick panel. Quite often, I find loose wire nuts that have almost burned off and make enough connection to show voltage until under a load. If this isn't it, it can be out of level far enough to cause a problem after the door panel is reinstalled. The door switches on these can lose connection if the unit isn't leveled properly as the unit sitting out of level directly affects the door strike. Lastly, is the harness stuck to the sound dampening material on the inside of the door liner? If so, it was identified as an issue that the sound dampening material on some units were actually absorbing into the wires' insulation and causing the harnesses to short.