Principles of Operation

Rear View Mirrors - Exterior

Principles of Operation

Power Mirrors

The movement of the LH and RH exterior mirror glass is controlled by the exterior mirror control switch and the LH and RH exterior mirror motors. Adjusting the exterior mirror switch to the LH or RH position determines which exterior mirror motor will be controlled. Voltage is supplied to the exterior mirror switch by Smart Junction Box (SJB) fuse 12 (7.5A). The exterior mirror control switch logic is the selected movement request from the exterior mirror control switch. When the exterior mirror control switch is adjusted to the left, right, up or down position, the exterior mirror control switch will supply voltage and ground to the selected exterior mirror motor to move the exterior mirror glass to the desired position.

The exterior mirrors use a jumper harness between the vehicle wire harness connector and the exterior mirror motor. The exterior mirror jumper harness is integral to the exterior mirror. Before replacing an exterior mirror or mirror motor, inspect the jumper harness for open and shorted circuits or damaged and pushed-out pins. If a concern with the exterior mirror jumper harness exists, an attempt to repair the jumper harness should be made.

Heated Exterior Mirrors

The rear window defrost switch controls the operation of the heated exterior mirror glass. The heated exterior mirror glass only operates when the rear window defrost system is ON. Voltage is supplied to the heated exterior mirror glass by the rear defrost relay, through Battery Junction Box (BJB) fuse 1 (15A), which isolates the rear window defrost system from the heated exterior mirror system in the event of a concern.