Heated Glass Element: Description and Operation

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 terminals 3 and 6
- through 20 A fuse (No.77 and 78 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 ON or START position power is supplied
- through 10 A fuse [No.12 located in the fuse block (J/B)]
- to NC control panel terminal 2
- to through 10 A fuse [No.1 located in the fuse block (J/B)] to BCM terminal 35

Ground is supplied to terminal 3 of NC control panel switch through body grounds M30 and M66 or terminal 8 of BCM through body grounds E43, E17.

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 12 of the NC control panel
- to BCM terminal 69

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.

Terminal 11 of the A/C control panel switch is grounded through rear window defogger ground B241.




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.




CAN COMMUNICATION UNIT







TYPE 1

System diagram










TYPE 2

System diagram