Heated Glass Element: Description and Operation

Rear Window Defogger

How the Circuit Works

Battery voltage is applied at all times through fuse 14 (under-hood fuse/relay box) to the rear window defogger relay contacts. With the ignition switch in ON (II), battery voltage is applied through fuse 30 (under-dash fuse/relay box) to the climate control unit and the rear window defogger relay coil.

When the rear window defogger switch (in the climate control unit) is pushed once, a signal is sent to the relay control module through the MICU system in order to provide ground for the rear window defogger relay through the climate control unit. The rear window relay contacts close. Battery voltage is applied to the defogger grid on the inside surface of the rear window, and the grid heats the rear window to remove any fog from the glass.

The defogger is turned off by pushing the rear window defogger switch a second time or by turning the ignition switch to LOCK (0).