Heated Glass Element: Description and Operation

The rear window defogger system is controlled by the time control unit. The rear window defogger operates only for approximately 15 minutes.

Power is supplied at all times
^ to rear window defogger relay terminal (3)
^ through 20 A fuse (No. (63), located in the fuse block [J/B]) and
^ to rear window defogger relay terminal (6)
^ through 20 A fuse (No. (64), located in the fuse block [J/B]).
With the ignition switch in the ON or START position, power is supplied
^ to the rear window defogger relay terminal (1).
When the rear window defogger switch in the AUTO A/C is activated, ground is supplied
^ through terminal (20) of the A/C auto amplifier
^ to the time control unit (located in the fuse block [J/B]) terminal [12A].
The time control unit (located in the fuse block [J/B]) terminal [10A] then supplies ground to the rear window defogger relay terminal (2).

With power and ground supplied, the rear window defogger relay is energized.
Power is supplied
^ through terminals (5) and (7) of the rear window defogger relay
^ to condenser terminal (1)
^ through terminal (2) of the condenser
^ to the rear window defogger terminal (3)
The rear window defogger has an independent ground.

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

When the system is activated, the rear window defogger ON signal is sent.
^ to terminal (30) of the A/C auto amplifier
^ from terminal (2) of the rear window defogger relay.
The rear window defogger indicator in the AUTO A/C illuminates.

Door mirror defogger
Door mirror defogger is connected parallel to rear window defogger. For wiring diagram of door mirror defogger,
Refer to "POWER DOOR MIRROR WITH HEATED MIRROR".
With rear window defogger switch ON, time control unit activates rear window defogger relay. Power is supplied
^ to door mirror defogger relay terminal (1)
^ through terminals (5) and (7) of the rear window defogger relay.
Then door mirror defogger relay is energized power is supplied to door mirror defogger.