Heated Glass Element: Description and Operation

REAR WINDOW DEFOGGER

System Description
The rear window defogger system is controlled by BCM (Body Control Module) and rear window defogger relay is controlled by IPDM E/R (Intelligent Power Distribution Module Engine Room). The rear window defogger operates only for approximately 15 minutes.

Power is supplied at all times
- to rear window defogger relay terminal 3 and 6
- through 20 A fuse (No. 35 and 36, located in the IPDM E/R)
- to BCM terminal 7
- through 50 A fusible link (letter f, located in the fuse and fusible link box).

With the ignition switch in the ACC or ON position, power is supplied
- to BCM terminal 36
- through 10 A fuse [No. 6, 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 defogger relay terminal 1 and
- to BCM terminal 35.

Ground is supplied to terminal 2 of rear window defogger switch through body ground M57 and M61 (with manual A/C) or terminal 8, 27 and 63 of BCM through body ground E15, E24, M57 and M61 (with auto A/C). BCM is connected to IPDM E/R as DATA LINE (CAN H line and CAN L line).

When the rear window defogger switch is turned ON, ground is supplied
- through terminal 1 of the rear window defogger switch
- to BCM terminal 69 (with auto A/C)
- through terminal 1 of the rear window defogger switch
- to rear window defogger switch terminal 2 (with manual A/C).

BCM output to IPDM E/R for rear window defogger switch signal as DATA LINE (CAN H line and CAN L line). Terminal 2 of rear window defogger relay then supplies ground to IPDM E/R terminal 54.

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.

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.

Power is supplied
- to terminal 3 of the rear window defogger switch
- from terminal 5 and 7 of rear window defogger relay.

Terminal 3 of the rear window defogger switch is grounded through rear window defogger ground B202 (with auto A/C) or terminal 4 of the rear window defogger switch is grounded through body ground M57 and M61 (with manual A/C).

System Diagram:

SYSTEM DIAGRAM

CAN Communication System Description
CAN (Controller Area Network) is a serial communication line for real time application. It is an on-vehicle multiplex communication line with high data communication speed and excellent error detection ability. Many electronic control units are equipped onto a vehicle, and each control unit shares information and links with other control units during operation (not independent). In CAN communication, control units are connected with 2 communication lines (CAN H line, CAN L line) allowing a high rate of information transmission with less wiring. Each control unit transmits/receives data but selectively reads required data only.

System Diagram For TCS Models:

Input/Output Signal Chart 1 For TCS Models:

Input/Output Signal Chart 2 For TCS Models:

System Diagram For A/T Models:

Input/Output Signal Chart 1 For A/T Models:

Input/Output Signal Chart 2 For A/T Models:

System Diagram For M/T Models:

Input/Output Signal Chart 1 For M/T Models:

Input/Output Signal Chart 2 For M/T Models: