Heated Glass Element: Description and Operation
Description and operationRear window is equipped with heating elements that clear condensation, frost and light show. Baked inside surface, heating elements, or grid lines, are connected to vertical buss bar lines that comprise an electrical circuit.
When dash-mounted switch is pressed, electric current is supplied through defrost relay in fuse box of engine compartment. Should rear glass not be cleared, switch must be pressed again for another 15 minutes heating cycle.
Circuit Operation
Rear Window Defroster
Battery voltage is always applied from "RR DEF (20 A )" to one side of the rear defroster relay and the other side of the relay is connected to the rear window defroster and defroster indicator. The indicator and defrosters is grounded permanently.
With the ignition switch "ON" position, battery voltage is applied from "RELAY (10 A)" fuse to one side of the rear defroster relay coil and the other side of rear defroster relay coil is connected to rear defroster switch.
When the rear defroster switch is pressed, ground is provided to one side of the relay coil. The rear defroster relay energizes and applies battery voltage to the indicator and defrosters until the rear defroster switch is pressed.