Heated Glass Element: Description and Operation

HEATED GLASS SYSTEM
The rear window defogger system is used to defog and deice the rear window in cases of freeze up and humid conditions. The rear window defogger switch is located to the right of the mode select knob on the HVAC control module on this model.

The Rear Window Defogger electrical system involves the operation of the Manual Temperature Control (MTC) head, the Body Control Module (BCM), and the rear window defogger relay and wiring. The system consists of a rear glass with two vertical bus bars and a series of electrically connected grid lines fired on the inside surface. The Body Control Module (BCM) operates a relay located in the right side trunk area on all models.

The system consists of a rear glass with two vertical bus bars and a series of electrically connected grid lines on the inside surface. The control switch is located in the HVAC Control Module. The relay is
located in the junction block. The timer is located in the Body Control Module (BCM). Circuit protection for heated grid is provided by:
- A 40 amp EBL fuse located in the power distribution center
- Rear window defogger relay (EBL) located in the Junction Block

When the button is depress to the ON position, current is directed to the rear defogger grid lines. A yellow indicator above the button will illuminate while the defogger is ON. The heated grid lines will heat the rear glass and clear the window surface of fog or frost.

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.