Heated Glass Element: Description and Operation

System Description

The rear window defogger system is controlled by the smart entrance 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. 7, located in the fuse block (J/B)] and
- to rear window defogger relay terminal 6
- through 20 A fuse [No. 4, located in the fuse block (J/B)].
- to smart entrance control unit terminal 49
- through 10 A fuse [No. 13, located in the fuse block (J/B)].

With the ignition switch in the ON or START position, power is supplied
- through 10 A fuse [No. 10, located in the fuse block (J/B)]
- to the rear window defogger relay terminal 1 and
- to smart entrance control unit terminal 27.

Ground is supplied
- to terminals 2 and 5 of the rear window defogger switch
- through body grounds M9, M25 and M87 (with navigation system),
- to terminal 32 of the A/C auto amp. (with auto A/C) or
- to terminal 17 of the A/C control unit (with manual A/C)
- through body grounds M9, M25 and M87 (without navigation system).
- to smart entrance control unit terminals 43 and 64 and rear window defogger switch terminal 5
- through body grounds M9, M25 and M87.

When the rear defogger switch is turned ON, ground is supplied
- through terminal 1 of the rear window defogger switch (with navigation system),
- through terminal 31 of the A/C auto amp. or 9 of the A/C control unit (with manual A/C)
- to smart entrance control unit terminal 14.

Terminal 37 of the smart entrance control unit 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 the rear window defogger and
- to terminal 30 of the A/C auto amp. (with auto A/C) or
- to terminal 10 of the A/C control unit (with manual A/C)
- to rear window defogger switch terminal 4 (with navigation system).

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 indicator illuminates in the rear window defogger switch.