The electric rear view mirrors utilize two motors for adjustments, one for vertical movement and another for horizontal movement. The control switch features a selector that directs voltage to either the left or right mirror. With the ignition in the ACC position, roll down the windows and operate the mirror control switch through all functions for both mirrors, listening for the sound of the motors. If no sound is heard or the mirror glass remains stationary, a problem with the drive mechanism may exist, necessitating removal and disassembly of the mirror to identify the issue. If the mirrors are unresponsive and silent, check the mirror fuse in the fuse block. If the fuse is intact, access the back of the mirror control switch by removing the switch bezel without disconnecting the attached wire, then turn the ignition on to check for voltage at the switch. There should be voltage at one terminal; if absent, inspect the wiring between the fuse panel and switch for faults. If voltage is present, disconnect the switch and test for continuity in all operating positions; replace the switch if continuity is lacking. Reconnect the switch and locate the wire leading to ground, then connect a jumper wire between this wire and ground. If the mirror operates normally, repair the faulty ground connection. If the mirror remains nonfunctional, remove it and check the wires for voltage while the ignition is on and the selector switch is positioned correctly. Operate the mirror switch in all positions, ensuring voltage is present at one of the switch-to-mirror wires in each position except the neutral "off" position. If voltage is absent in any position, inspect the wiring for opens and shorts. If voltage is confirmed, remove the mirror and test it off the vehicle with jumper wires, replacing it if it fails this test.