Heated Glass Element: Description and Operation

With the Ignition Switch in the RUN position, voltage is applied to the Rear Defogger Control Switch. When the Rear Defogger Control Switch is pressed, voltage is applied to the solid state Timing Circuit, providing voltage to the ON Indicator and the rear Defogger. The rear window becomes warm to remove the condensation from the surface of the window.The contact in the Timing Circuit stays closed until the Rear Defogger Control Switch is pressed again, the timer cycle is complete, or the Ignition Switch is turned to the OFF position.

The first time the Rear Defogger Control Switch is pressed, the Timing Circuit allows the Rear Defogger to operate for approximately ten minutes. Each time after that when the Rear Defogger Control Switch is pressed, the Timing Circuit operates for approximately five minutes. The Timing Circuit resets to ten minutes when the Ignition Switch is turned to the OFF position.