Most electric side 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 ON but the engine OFF, roll down the windows and operate the mirror control switch through all functions for both mirrors, listening for the sound of the electric motors. If the motors are audible but the mirror glass remains stationary, a problem with the drive mechanism is likely, necessitating removal and disassembly of the mirror to identify the issue. In cases where the mirrors are unresponsive and silent, checking the fuse is essential. If the fuse is intact, remove the mirror control switch without disconnecting the wires, turn the ignition ON, and verify voltage at the switch; one terminal should show voltage. If absent, inspect for an open or short in the wiring between the fuse panel and the switch. If voltage is present, disconnect the switch and test for continuity in all operating positions; a lack of continuity indicates the need for replacement. After reconnecting the switch, locate the wire leading to ground and, while keeping the switch connected, use a jumper wire to connect this wire to ground. If the mirror operates normally, repair the faulty ground connection. If the mirror remains nonfunctional, remove it and check for voltage at the mirror wires with the ignition ON and the selector switch positioned appropriately, ensuring voltage is present in each switch position except the neutral "off" position. If voltage is missing in any position, inspect the wiring between the mirror and control switch for faults. If voltage is confirmed, test the mirror off the vehicle with jumper wires, replacing it if it fails this test.