Heated Mirror Switch: Description and Operation

Fig. 2 Heated Mirror Switch:

MIRROR SWITCH
The heated mirror switch, the heated mirror system indicator lamp, the heated mirror system solid state electronic control logic and timer circuitry and the heated mirror relay are all integral to the a/c heater control, which is located between the instrument cluster and the radio near the center of the instrument cluster bezel on the instrument panel. The heated mirror switch and the heated mirror system indicator lamp are visible in the lower left corner of the a/c heater control face plate.

The heated mirror switch, the heated mirror system indicator lamp, the heated mirror system solid state electronic control logic and timer circuitry and the heated mirror relay cannot be repaired. If any of these components is damaged or faulty, the entire a/c heater control must be replaced. (Refer to HEATING & AIR CONDITIONING/CONTROLS/A/C HEATER CONTROL - REMOVAL Control Assembly).

The momentary-type heated mirror switch provides a hard-wired battery current signal to the heated mirror system electronic control logic circuitry each time it is depressed. In response to the heated mirror switch input, the electronic control logic and timer circuitry energizes or de-energizes the amber heated mirror system indicator lamp next to the heated mirror switch to indicate that the heated mirror system is turned ON or OFF. The electronic control logic and timer circuitry also energizes or de-energizes the heated mirror relay, which controls the feed of electrical current to the outside mirror heating grids.

The heated mirror system electronic control logic and timer circuitry is programmed to turn the heated mirror system OFF automatically after about fifteen minutes of operation. If the heated mirror system is turned ON a second time following an initial time-out event during the same ignition switch cycle, the heated mirror system electronic control logic and timer circuit is programmed to turn the system OFF automatically after about five minutes. When the electronic control logic and timer circuit detects that a programmed time interval has elapsed, it will automatically de-energize the heated mirror system indicator lamp and the heated mirror relay. The heated mirror system will also be turned OFF if the heated mirror switch is depressed while the system is turned ON, or if the ignition switch is turned to the OFF or Accessory positions.