Heated Glass Element: Description and Operation

System Description

MODELS WITHOUT POWER DOOR LOCKS
The rear window defogger system is controlled by the rear window defogger timer. Each time the rear window defogger switch is pressed, the rear window defogger operates for approximately 15 minutes. The rear window defogger switch is integral to the air control.

Power is supplied at all times
- to rear window defogger relay terminal 5
- through 20 A fuse [No.25, 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.5, located in the fuse block (J/B)]
- to rear window defogger relay terminal 1 and
- to rear window defogger timer terminal 1.

Ground is supplied to air control (rear window defogger switch) terminal 8 and rear window defogger timer terminal 4 through body grounds M14 and M68.

With the rear window defogger switch (located in air control) ON, ground is supplied
- to rear window defogger timer terminal 3
- through air control (rear window defogger switch) terminal 8.

Rear window defogger timer terminal 2 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 terminal 3 of the rear window defogger relay
- to rear window defogger terminal +.

Rear window defogger terminal - is grounded through body ground R102.

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 air control. Power is supplied
- from rear window defogger relay terminal 3
- to air control (rear window defogger switch) terminal 4.

Air control terminal 8 is grounded through body grounds M14 and M68.

MODELS WITH POWER DOOR LOCKS
The rear window defogger system is controlled by the smart entrance control unit. Each time the rear window defogger switch is pressed, the rear window defogger operates for approximately 15 minutes. The rear window defogger switch is integral to the air control.

Power is supplied at all times
- to rear window defogger relay terminal 5
- through 20 A fuse [No.25, located in the fuse block (J/B)], and
- to smart entrance control unit terminal 49
- through 7.5 A fuse [No.28, 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.5, located in the fuse block (J/B)]
- to rear window defogger relay terminal 1 and
- to smart entrance control unit terminal 27.

Ground is supplied to air control (rear window defogger switch) terminal 8 and smart entrance control unit terminals 43 and 64 through body grounds M14 and M68.

With the rear window defogger switch (located in air control) ON, ground is supplied
- to smart entrance control unit terminal 14
- through air control (rear window defogger switch) terminal 5.

Smart entrance control unit terminal 37 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 terminal 3 of the rear window defogger relay
- to rear window defogger terminal +.

Rear window defogger terminal - is grounded through body ground R102.

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 air control. Power is supplied
- from rear window defogger relay terminal 3
- to air control (rear window defogger switch) terminal 4.

Air control (rear window defogger switch) terminal 8 is grounded through body grounds M14 and M68.