Left-Side Power Mirror Inoperative In Up/Down Positions

Using test light, backprobe between power mirror switch harness connector terminals "D" (Yellow wire) and "C" (Light Green wire). Move power mirror switch to UP and DOWN positions. If test light illuminates in both positions, go to next step. If test light does not illuminate in one or both positions, replace power mirror switch.
Using test light, backprobe between left-side power mirror harness connector terminals "C" (Yellow wire) and "D" (Light Green wire). Move power mirror switch to UP and DOWN positions. If test light illuminates in both positions, replace left-side power mirror. If test light does not illuminate in both positions, repair open in Yellow or Light Green wire between power mirror switch and left-side power mirror.