Heated Glass Element: Description and Operation

Rear Window Defogger(typical):

The electrically heated Rear Window Defogger, Heated Power Side View Mirrors is available on select models.

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 heater-A/C control and a relay with timer switch to turn OFF the system after ten minutes. The main feed circuit is protected by fuse 13 (40 amp) in the Power Distribution Center (PDC) which is connected directly to the front control module (FCM) to form an integrated unit called an Integrated Power Module (IPM). The rear defogger switch and relay also activates the heated power side view mirrors. The rear defogger switch also activates the heated windshield wiper deicer which is powered by the RUN/ACC relay in the IPM and feed thru fuse #11 (20 amp) in the PDC. The heated mirror circuit is protected by a non-servicable Positive Temperature Coefficient (PTC) located inside the PDC. The heated windshield wiper de-icer circuit is protected by fuse 11 (20 amp) in the PDC.

CAUTION: Since grid lines can be damaged or scraped off by 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.