Heated Glass Element: Description and Operation

OPERATION
With the Ignition Switch in "RUN", the rear window defrost control is powered through fuse 7.

Pressing the momentary defrost switch "ON" closes the contacts of the rear window defrost relay and starts the ten minute (approximate) timing cycle. Current then flows to the rear window defrost grid. When the rear window defrost control is released from "ON", the solid state circuitry keeps the defrost relay coil energized.

Pressing the rear window defrost control "OFF" turns off the defrost relay. This removes power from the rear window defrost circuit.

If the "OFF" switch is not pressed, power will remain on until the time delay runs out. Then the coil will turn off and remove power from the rear window defrost grid.