Heated Glass Element: Description and Operation

REAR WINDOW DEFOGGER

System Description
The rear window defogger system is controlled by the BCM (Body Control Module), The rear window defogger is operated only for approximately 15 minutes.

Power is supplied at all times
- through 20 A fuse [NO.10, located in the fuse block (J/B)]
- to the rear window defogger and door mirror defogger relay terminal 6,
- through 20 A fuse [NO.11, located in the fuse block (J/B)]
- to the rear window defogger and door mirror defogger relay terminal 3,
- through 10 A fuse [NO.3, located in the fuse block (J/B)]
- to BCM terminal 105.

With the ignition switch in the ACC or ON position, power is supplied
- through 10 A fuse [NO.4, located in the fuse block (J/B)]
- to the door mirror defogger relay terminal 5,

With the ignition switch in the ON or START position, power is supplied
- through 10 A fuse [NO.1, located in the fuse block (J/B)]
- to BCM terminal 68,
- to the rear window defogger and door mirror defogger relay terminal 1.

When the rear defogger switch in the multifunction switch is ON, ground is supplied
- through terminal 5 from the multifunction switch (rear window defogger switch),
- to BCM terminal 10.

Then ground is supplied
- through BCM terminal 56 and 113
- through body grounds M24 and M114.

Then BCM recognizes that rear window defogger switch is turned to ON.

When BCM recognized that rear window defogger switch is turned to ON, ground is supplied
- to the rear window defogger and door mirror defogger relay terminal 2,
- through BCM terminal 144,
- through BCM terminal 56 and 113
- through body grounds M24 and M114, and rear window defogger relay and door mirror defogger is energized.

When rear window defogger and door mirror defogger relay is turned ON, power is supplied
- to rear window defogger terminal 2,
- through condenser terminal 1,
- through rear window defogger and door mirror defogger relay terminal 5 and 7.

Rear window defogger terminal 1 is ground through body ground B422.

With power and ground supplied rear window defogger filaments heat and defog the rear window.

When rear window defogger and door mirror defogger relay is turned ON, power is supplied.
- to door mirror defogger relay terminal 2,
- through rear window defogger and door mirror defogger relay terminal 5 and 7.

Door mirror defogger relay terminal 1 is ground through body ground B17 and B57.

With power and ground supplied, Door mirror defogger relay is energized.

When door mirror defogger relay is turned ON,
power is supplied.
- to door mirror defogger terminal (Driver side and Passenger side) 6.
- through door mirror defogger relay terminal 3.

Door mirror defogger (D and P) terminal 5 is ground through body grounds M24 and M114.

With power and grounds supplied, door mirror defogger filaments heat and defog the mirror.

When rear window defogger and door mirror defogger relay is turned ON,
power is supplied.
- to multifunction switch (rear window defogger switch) terminal 6,
- through rear window defogger and door mirror defogger relay terminal 5 and 7.

Multifunction switch (rear window defogger switch) terminal 2 is ground through body ground M24 and M114.

And then energizes rear window defogger indicator is illuminated.