The power mirror defogger provides the timer control function that is controlled by the HVAC control unit. The timer control is operated by turning the vehicle to the ON mode, then turn on the rear window defogger/power mirror defogger switch. The timer operating time varies according to ambient temperature. If the rear window defogger/power mirror defogger switch is turned on when the timer is active, it toggles between ON and OFF every time the switch is pressed.

Timer operation time is changed under the following conditions:

The power mirror defogger is controlled by the rear window defogger/mirror defogger switch.

The power mirror defogger is controlled by the climate control unit. When the vehicle is in the ON mode and the rear window defogger/mirror defogger switch is pressed, the climate control unit sends the defogger ON signal as a B-CAN signal to the door multiplex control unit. The door multiplex control unit operates the left mirror defogger, and sends the defogger ON signal via the LIN to the front passenger's power window switch to operate the right mirror defogger.

When the climate control unit^*1 or the door multiplex control unit^*2 receives a signal that the outside air temperature is 41 °F (5 °C) or below from the outside air temperature sensor, the climate control unit^*1 or the door multiplex control unit^*2 automatically turns on the left and right power mirror defoggers within 10 seconds after the vehicle is in the ON mode. The power mirror defogger output automatically stops in 10 minutes as a result of its timer. If the rear window defogger/power mirror defogger switch is pressed during the power mirror defogger output, the climate control unit^*1 or the door multiplex control unit^*2 stops the auto operation function immediately.

*1: Without Door Multiplex Control Unit
*2: With Door Multiplex Control Unit