Heated Glass Element: Description and Operation

The rear window defogger will clear fog, frost and thin ice from the rear window. Battery voltage is applied at all times through fuse 16 to the rear window defogger relay contacts. With the ignition switch in its RUN position, voltage is applied through fuse 8 to the rear window defogger relay coil and the defogger ON indicator.

When you turn the rear window defogger switch to ON, a path to ground is provided for the rear window defogger relay coil and the defogger ON indicator through the integrated control unit. The defogger ON indicator lights up and the rear window defogger relay contacts close. Voltage is applied to the defogger grid on the surface of the rear window and the grid heats the glass.

A timer in the integrated control unit will automatically turn off the rear window defogger after 20 to 30 minutes.