Heated Glass Element Relay: Description and Operation

HEATED GLASS DESCRIPTION
The electrically heated Rear Window Defogger, Heated Power Side View Mirrors, and Heated Windshield Wiper De-icer is available on all models.

OPERATION
The Rear Window Defogger system consists of two vertical bus bars linked by a series of grid lines on the inside surface of the rear window. The electrical circuit consists of the rear defogger switch in the HVAC and a relay with timer switch to turn OFF the system after ten minutes. The main feed circuit is protected by fuse one (40 amp) in the Power Distribution Center (PDC). Power and Ground Distribution The rear defogger switch and relay also activates the heated power side view mirrors and heated windshield wiper de-icer. The HVAC rear defogger switch is protected by fuse ten (10 amp) in the Junction Block. The heated mirror circuit is protected by fuse 7 (10 amp) in the junction block. The heated windshield wiper de-icer circuit is protected by fuse 9 (10 amp) in the Junction Block. Fuse Block

The Heated Windshield Wiper De-icer is also activated when the DEFROST mode is selected on the HVAC. In the DEFROST mode the rear defogger relay/timer is bypassed, the heated windshield wiper de-icer will stay ON until the another mode is selected. For circuit information and component location refer to Group 8W, Wiring Diagrams. Electrical Diagrams

CAUTION: Since grid lines can be damaged or scraped off with sharp instruments, care should be taken in cleaning the glass or removing foreign materials, decals or stickers. Normal glass cleaning solvents or hot water used with rags or toweling is recommended.