Most electric rear view mirrors utilize two motors for adjustments, then basic motion.one for the vertical movement and the other for the horizontal movement. The control switch used includes a selection that enables voltage to be supplied either through the left or right side mirror. Place the select lever in the 'park' position and open the windows and operate the mirror control switch through each function for both the mirrors and test for the loud sound of the electric motors to confirm. If the motors are noisy but the mirror glass does not move, there is a problem with the drive most probably and the mirror has to be taken off and dismantled to have the fault isolated. When the mirrors are uncommunicative and seemingly unable to respond, then, the
Fuse should be checked. If fuse is okay, then, with the wires still connected, remove the mirror control switch on the body, engage the ignition on, and check with a meter for voltage at the switch, one terminal should display voltage. If not found, look for an open or a short in the wiring between the fuse panel and the switch. If voltage is present, then remove the switch and carry out continuity check in all positions; if no continuity, then replacement is required. Connect the switch back and find the wire going to ground; then with the switch connected, use another wire and short this wire to the ground. Should the mirror function properly, then reconnect the bad ground. If the mirror does not turn on, replace it with a standard mirror, and test for voltage at the mirror wires with the ignition ON and the selector switch in correct position and test for voltage at one of the switch to mirror wire in all the positions except the "neutron OFF" button. If there is no voltage on any position, check between the mirror and the control switch for wiring problem. If voltage is confirmed, test the mirror off the vehicle with jumper wires and replace this mirror if it fails this test.