Electric Window Defoggers: Operation

Heated rear window system is controlled by a three position switch with "ON", "OFF" and "NORMAL" positions. Switch is spring loaded and returns to center ("NORMAL") position from either "ON" or "OFF" positions. When switch is turned "ON", voltage is applied to rear window grid and indicator light. When switch returns to "NORMAL" position, sufficient current is provided to hold relay coil energized and relay contacts closed. On vehicles with timer relay, electric current remains on for approximately ten minutes. On vehicles with continuous relay, electric current remains on until control switch or ignition is turned "OFF".