Heated Glass Element: Description and Operation

When the Ignition Switch is turned to "RUN," voltage is applied through Fuse 4 to the Rear Defogger Switch in the Heater-A/C Control. A solid state timer controls battery voltage from Fuse 16 through a relay. When the Rear Defogger Switch is pressed, voltage is momentarily applied to the timer, activating the relay controlling the Rear Window Defogger Grid. This relay will remain closed by the timer until the defog cycle is complete or the Rear Defogger Switch is pressed a second time.

When the Ignition Switch is turned to "RUN" and the Rear Defogger Switch pressed for the first time, the defog cycle lasts 10 minutes and further operation will result in 5 minute defog cycles. The defog cycle is reset to 10 minutes when the Ignition Switch is turned to "OFF" and back to "RUN."

The Defogger "ON" Indicator is an LED that illuminates when the Rear Defogger is "ON." This LED will be step dimmed by the Light Emitting Diode (LED) Indicator Control when the Park Lamps are turned "ON."