Rear Defogger: Description and Operation

Rear Window Defogger:

REAR WINDOW DEFOGGER
The rear window defogger is controlled by the integrated control unit. Pushing the defogger switch in the instrument panel sends a signal to the defogger timer in the integrated control unit, and the defogger stays on for 25 minutes or until the ignition switch is turned off. The indicator light in the switch comes on when the defogger works.


Voltage is applied at all times through fuse 38 to the rear window defogger relay. With the ignition switch in ON (II), voltage is applied through fuse 13 to the rear window defogger relay 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 and the defogger ON indicator through the integrated control unit. The defogger ON indicator light comes ON and the rear window relay contact close. Voltage is applied to the defogger grid on the surface of the rear window and the grid heats to remove any fog from the glass.

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







CAUTION:
All SRS wire harnesses are covered with yellow insulation. Before you disconnect any part of an SRS wire harness, disconnect the airbag connectors.

Whenever the ignition switch is ON, or has been turned OFF for less than three minutes, be careful not to bump the SRS unit; the airbags could accidentally deploy and cause damage or injuries.

For additional precautions, refer to the SRS section Service Precautions.