How the Circuit Works

Battery voltage is supplied at all times to the Rear Window Defogger Relay contacts through fuse 59 (in the Under-dash Fuse/Relay Box). With the ignition switch in ON (II), battery voltage is supplied to the Rear Window Defogger Relay coil and to the Climate Control Unit through fuse 10 (in the Under-dash Fuse/Relay Box).

When the Rear Window Defogger Switch (in the Climate Control Unit) is pressed, ground is provided to the Rear Window Defogger Relay coil, energizing the relay. Battery voltage is supplied to the Upper Rear Window Defogger and the Lower Rear Window Defogger through the energized relay.

The Rear Window Defogger is turned off by pressing the Rear Window Defogger Switch a second time or by turning the ignition switch to LOCK (0).

Refer to the REAR WINDOW DEFOGGER for specific tests and troubleshooting procedures.