Heated Glass Element: Description and Operation

When the Ignition Switch is turned to "RUN", voltage is applied through the GAGES Fuse to the Rear Defogger Control. When the Rear Defogger Switch is pressed, voltage is momentarily applied to the Solid State Timer Relay. When voltage is applied to the Solid State Timer Relay through the Rear Defogger Switch, it will close the internal contacts. The internal contacts remain closed until the defog cycle is complete or Rear Defogger Switch is pressed a second time.

When the internal contacts of the Rear Defogger Control are closed, voltage is applied to the Rear Defogger and Indicator.

The Rear Defogger Control contains a Solid State Timer Relay to control the time the internal contacts are closed. 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 minutes defog cycles. The defog cycle is reset to 10 minutes when the Ignition Switch is turned to "OFF" and back to "RUN".