I have an 08 Tahoe, with power fold-in mirrors w/blinkers, courtesy lights and heated. When I select the left mirror to fold in, they fold in as they should. However, when I select the right mirror, nothing happens with the right mirror, instead they left mirror folds in. same happens when folding out. Essentially, I seem to have no power, and hear no motor on the right side, and all actions taken activate the left side, all the time. Where should I start testing? Could my issue be the right mirrors motor, switch? I'm confused by the left side having constant power, could this be because of the reverse polarity?