Heated Glass Element: Description and Operation

HEATED GLASS

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.

Rear Window Defogger - Typical:

The rear window defogger system consists of two vertical bus bars linked by a series of grid lines fired onto the inside surface of the rear window.

The rear window defogger system is turned ON or OFF by a control switch located on the A/C-heater control at the center of the instrument panel and by a rear window defogger relay timing circuit integral to the integrated power module (IPM).

Circuit protection is provided by a 40 amp fuse located in the IPM.

When the rear window defogger button is depressed to the On position, current is directed to the rear defogger grid lines and the heated power mirrors (if equipped). The heated grid lines heat the glass to help clear the rear window and side mirror surfaces of fog or frost.

The defogger system is controlled by a momentary switch located in the
A/C-heater control on the instrument panel. A yellow indicator in the switch will illuminate to indicate when the defogger system is turned on. The integrated power module (IPM) contains the 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 five minutes.

The 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 turned on again during the same ignition cycle, the defogger system will automatically turn off after about five minutes.

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