Most 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 side 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. Listen for the sound of the electric motors; if they are audible but the mirror glass remains stationary, there may be an issue with the drive mechanism. If there is no sound from the mirrors, check the
Fuse. If the fuse is intact, remove the mirror control switch and have its continuity tested by a qualified repair facility. Additionally, inspect the ground connections and check for voltage at the mirror when the switch is activated. If voltage is absent in each switch position, investigate the circuit for any opens or shorts. If voltage is present, remove the mirror and test it off the vehicle using jumper wires, replacing it if it does not pass the test.