Heated Glass Element: Description and Operation

Voltage is applied at all times through fuse 31 to the rear window defogger relay. With the ignition switch in RUN, voltage is applied through fuse 17 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 light comes on and the rear window defogger relay contact closes. Voltage is applied to the defogger grid on the rear window and the grid heats the rear window to remove any fog from the glass.

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