Rear Defogger: Description and Operation

If equipped with power door locks, the rear defogger system is controlled by the smart entrance control unit. If not equipped with power door locks, the rear defogger system is controlled by the rear window defogger timer. The rear window defogger operates for approximately 15 minutes.
Power is supplied at all times:
^ through 20 A fuse (No. (4), located in the fuse block [J/B]
^ to rear window defogger relay terminal (3) and
^ through 20 A fuse (No. (5), located in the fuse block [J/B])
^ to rear window defogger relay terminal (6).
With the ignition switch in the ON or START position, power is supplied:
^ through 7.5 A fuse (No. (8), located in the fuse block [J/B])
^ to rear window defogger relay terminal (1) and
^ to smart entrance control unit terminal (11) (models with power door locks), or
^ to rear window defogger timer terminal (1) (models without power door locks).
Ground is supplied to terminal (2) of the rear window defogger switch through body grounds (M43), (M44) and (M60)
When the rear window defogger switch is turned ON, ground is supplied:
^ through terminal (1) of the rear window defogger switch
^ to smart entrance control unit terminal (20) (models with power door locks) or
^ to rear window defogger timer terminal (3) (models without power door locks).
Terminal (36) of the smart entrance control unit (models with power door locks) or terminal (2) of the rear window defogger timer (models without power door locks) 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 rear window defogger terminal (1).
Ground is supplied to terminal (2) of rear window defogger through body ground (B202).
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 indicator illuminates in the rear window defogger switch.
Power is supplied:
^ to terminal (3) of the rear window defogger switch
^ from terminals (5) and (7) of the rear window defogger relay.
Terminal (4) of the rear window defogger switch is grounded through body grounds (M43), (M44) and (M60).