Rear Defogger: Description and Operation

Function:

FUNCTION
^ The following time control function is controlled by BCM

The rear window defogger system is controlled by the BCM.
Power is supplied at all times:
^ through 20 A fuse (No. (38) located in the fuse block (J/B))
^ to rear window defogger relay terminal (3) and
^ through 20 A fuse (No. (39) 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:
^ to the rear window defogger relay terminal (1) and
^ to BCM terminal (27)
^ through 7.5 A fuse (No. (12) located in the fuse block (J/B))
When the rear window defogger switch is turned ON, ground is supplied:
^ through terminal (1) of the rear window defogger switch
^ to BCM terminal (28)
Terminal (7) of the BCM then supplies ground to the rear window defogger relay terminal (2).
With power and ground supplied, the rear window defogger relay is energized to operate rear window defogger for about 15 minutes.