Rear Window Defogger Relay: Description

WARNING: This page is about a different car, the 2003 Jeep Liberty. However, it is still accessible from the selected car via links, so may be relevant.

The rear window defogger relay is a International Standards Organization (ISO)-type relay. The rear window defogger relay is a electromechanical device that switches fused battery current to the rear glass and outside mirror heating grids, and the indicator lamp of the defogger switch, when the HVAC control head rear window defogger timer and logic circuitry grounds the relay coil. (Refer to DIAGNOSIS AND TESTING - REAR WINDOW DEFOGGER RELAY ).

The rear window defogger relay is located in the junction block, on the left side of the instrument panel inboard to the center of the vehicle (just to the left and above the brake pedal or behind the knee blocker). The rear window defogger relay cannot be repaired and, if faulty or damaged, it must be replaced.