Heated Glass Element: Description and Operation

With the Ignition Switch in RUN, voltage is applied to the Wiper Switch Assembly. When the Rear Defogger Switch is pressed ON, voltage is applied to the Rear Defogger Timer-Relay. The contact closes, providing voltage to the On Indicator and the Rear Defogger. The rear window will become warm to remove the fog from the surface of the window.

The contact in the Rear Defogger Timer-Relay will stay closed until the Rear Defogger Switch is pressed again, the timer cycle is complete, or the Ignition Switch is turned to OFF:

The first time the Rear Defogger Switch is pressed, the Rear Defogger Timer-Relay will allow the Rear Defogger to operate for approximately 10 minutes. Each time after that when the Rear Defogger Switch is pressed, the Rear Defogger Timer-Relay will operate for approximately 5 minutes. The Rear Defogger Timer-Relay will reset to 10 minutes when the Ignition Switch is turned OFF.