Principles of Operation

PRINCIPLES OF OPERATION

Adjusting the exterior rear view mirror control switch to the LH or RH position determines which power mirror glass will be controlled.

Heated Exterior Rear View Mirror
The heated exterior rear view mirrors only operate when the heated rear window is ON. The heated rear window switch controls the operation of the heated exterior rear view mirrors. The heated rear window switch is an integral part of the HVAC electronic automatic temperature control (EATC) module or the HVAC electronic manual temperature control (EMTC). The heated exterior rear view mirror power is supplied by the heated rear window relay through a separate battery junction box (BJB) fuse that isolates the heated exterior rear view mirrors from the heated rear window system in the event of a concern.

Interior Auto-Dimming Rear View Mirror
The interior auto-dimming rear view mirror automatically reduces the glare caused by headlamps reflecting in the interior rear view mirror. The auto-dimming feature is disabled when the vehicle is in REVERSE. Power is supplied to the auto-dimming interior mirror when the ignition is in the RUN or ACC position.

The interior auto-dimming rear view mirror has 2 photoelectric sensors that detect forward and rearward light conditions. Based on these inputs, the automatic dimming feature adjusts the reflectance level of the interior rear view mirror glass to eliminate unwanted glare. The reflectance level of the mirror glass is variable and depends on the amount of rearward glare in relation to ambient light conditions in front of the interior mirror.

When the forward sensor detects daytime conditions, the rearward sensor is inactive and the interior rear view mirror stays in a high reflectance mode. When the forward sensor detects nighttime conditions, the rearward sensor is active and detects glare from the headlights of vehicles approaching from the rear or other glare-producing light sources. To provide increased visibility when backing up, the interior rear view mirror will automatically return to a high reflectance mode whenever the vehicle is in REVERSE.

If the forward or rearward sensors are blocked, the automatic dimming interior mirror might not work correctly.

Memory Exterior Mirrors
The memory mirror function recalls the preferred positioning of the exterior mirrors. Memory is activated by the door mounted switches or the remote keyless entry (RKE) transmitter. The driver seat module (DSM) constantly tracks the exterior mirror position by using the potentiometers in the exterior mirror assembly. The positions remain in memory as long as the DSM retains power. When a memory position is recalled by the operator, the DSM powers the exterior mirror motors simultaneously and monitors the potentiometer circuits. When the stored memory position is reached, the DSM removes the voltage from the motors. If the exterior mirror control switch is operated during a memory recall, the DSM stops the recall and responds to the exterior mirror control switch command.

For information on the DSM and Memory Position Programming, refer to Seats.