Heated Glass Element: Description and Operation

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

The rear window defogger system consists of a back glass with two vertical electrical bus bars linked by a series of grid lines fired onto the inside surface of the optional heated rear window.

The rear window defogger system is turned On or Off by a switch and a timing circuit integral to the A/C-heater control located at the center of the instrument panel.

Circuit protection is provided by a cartridge fuse located in the power distribution center (PDC) for the heated grid circuit, and a fuse located in the fuse block for the control circuit.

The rear window defogger system is turned on by a momentary switch located in the A/C-heater control on the instrument panel. When the rear window defogger switch is pressed to the On position, current is directed through the rear window defogger relay to the rear defogger grid lines. The heated grid lines heat the rear glass to help clear the rear window surface of fog or frost.

A yellow indicator above the switch will illuminate to indicate when the rear window defogger system is turned on. The A/C-heater control contains the rear window defogger system control circuitry.

NOTE: The rear window defogger turns off automatically after approximately 10 minutes of initial operation. Each following activation cycle of the defogger system will last approximately ten minutes also.

The rear window defogger system will be automatically turned off after a programmed time interval of about ten minutes. After the initial time interval has expired, if the defogger switch is pressed to the On position again during the same ignition cycle, the rear window defogger system will automatically turn off after about ten minutes also.

The rear window defogger system will automatically shut off if the ignition switch is turned to the Off position, or it can be turned off manually by pressing the defogger switch a second time.