Heated Glass Element: Description and Operation

Component Parts And Harness Connector Location:

REAR WINDOW DEFOGGER

System Description
The rear window defogger system is controlled by BCM and rear window defogger relay is controlled by IPDM E/R (intelligent power distribution module engine room). The rear window defogger operates for approximately 15 minutes.

Power is supplied at all times
- to rear window defogger relay terminal 3
- through 20 A fuse (No. 32, located in the IPDM E/R),
- to rear window defogger relay terminal 6
- through 20 A fuse (No. 37, located in the IPDM E/R), and to BCM terminal 70
- through 50 A fusible link (letter f , located in the fuse and fusible link box).

With the ignition switch in the ON or START position, power is supplied
- to BCM terminal 38
- through 10 A fuse [No. 1, 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.12, located in the fuse block (J/B)]
- to rear window defogger relay terminal 1, and

Ground is supplied
- to terminal 67 of the BCM
- through body grounds F14, M57 and M61, and
- to rear window defogger terminal -
- through body ground B202.

BCM is connected to IPDM E/R as DATA LINE (CAN-H and CAN-L).

When the rear window defogger switch is turned ON, ground is supplied
- to BCM terminal 9
- through terminal 22 of the front air control.

BCM outputs rear window defogger switch signal to IPDM E/R via DATA LINE (CAN H line and CAN L line).
Ground is then supplied to terminal 2 of the rear window defogger relay through IPDM E/R terminal 52.

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 23 of the front air control.

The rear window defogger has an independent ground.

System Diagram

System Diagram:

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.

CAN Communication System Description
Refer to Information Bus.