Heated Glass Element: Description and Operation

Voltage is applied at all times through fuse 34 to the rear window defogger relay. With the ignition switch in ON (II), voltage is applied through fuse 13 to the rear window defogger switch.

When you turn the switch ON, voltage is applied to the defogger timer unit. The timer Unit supplies voltage to the rear window defogger relay (coil). The relay energizes and voltage is supplied to the rear window defogger. The defogger grid heats the rear window to remove any condensation from the glass.

The defogger timer circuit will automatically turn OFF the rear window defogger after about 25 minutes.