Rear Defogger: Description and Operation

System Description The rear window defogger system is controlled by the smart entrance control unit. Once turned on, the rear window defogger operates for approximately 15 minutes.
Power is supplied at all times:
^ through 45 A fusible link (letter (g), located in the fuse and fusible link box)
^ to rear window defogger relay terminals (5) and (7).
With the ignition switch in the ON or START position, power is supplied:
^ through 10 A fuse (No. (30), located in the fuse block)
^ to smart entrance control unit terminal (25).
With the ignition switch in the ON position, power is supplied:
^ to rear window defogger relay terminal (1).
Ground is supplied:
^ to rear window defogger switch terminal (2)
^ to smart entrance control unit terminal (20)
^ through body grounds (M5), (M78) and (M123).
When the rear window defogger switch is activated, ground is supplied:
^ through rear window defogger switch terminal (1)
^ to smart entrance control unit terminal (31). Smart entrance control unit terminal (13) then supplies ground to rear window defogger relay terminal (2).
With power and ground supplied, the rear window defogger relay is energized and power is supplied:
^ from rear window defogger relay terminals (3) and (6)
^ through 20 A fuses (No. (14) and (15), located in the fuse block)
^ to rear window defogger terminal (1). The rear window defogger is grounded through body ground (D403).
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 rear window defogger switch terminal (3)
^ through 10 A fuse (No. (16), located in the fuse block)
^ from rear window defogger relay terminals (3) and (6).
Ground is supplied:
^ to rear window defogger switch terminal (4)
^ through body grounds (M5), (M78) and (M123).