Heated Glass Element: Description and Operation

System Description

The rear window defogger system is controlled by BCM (Body Control Module) and IPDM E/R (Intelligent Power Distribution Module Engine Room).

The rear window defogger operates only for approximately 15 minutes.

Power is at all times supplied
- through 20 A fuse [No.77 and 78 located in the IPDM E/R]
- to rear window defogger relay terminal 3 and 6.
- through 10 A fuse [No.21 located in the fuse block (J/B)]
- to rear window defogger relay terminal 1.
- through 50 A fusible link [letter F located in the fuse block (J/B)]
- to BCM terminal 7.

With the ignition switch turned to ON or START position

Power is supplied
- through 10 A fuse [No.1 located in the fuse block (J/B)]
- to BCM terminal 35.
- through 10 A fuse [No.12 located in the fuse block (J/B)]
- to A/C and audio controller terminal 22.

Ground is supplied
- to BCM terminal 8
- through body grounds E17 and E43.
- to A/C and audio controller terminal 3
- through body grounds M30 and M66.
- to internal CPU of IPDM E/R terminal 14 and 45
- through body grounds E17 and E43.

When A/C and audio controller (rear window defogger switch) is turned to ON

Ground is supplied
- to BCM terminal 69
- through A/C and audio controller terminal 12
- through A/C and audio controller terminal 3
- through body grounds M30 and M66.

Then rear window defogger switch is illuminated.

Then BCM recognizes that rear window defogger switch is turned to ON.

Then it sends rear window defogger switch signals to IPDM E/R via DATA LINE (CAN-H CAN-L).

When IPDM receives rear window defogger switch signals

Ground is supplied
- to rear window defogger relay terminal 2
- through IPDM E/R terminal 54
- through internal CPU of IPDM E/R and IPDM E/R terminal 45
- through body grounds E17 and E43.

and then rear window defogger relay is energized. When rear window defogger relay is turned ON Power is supplied
- through rear window defogger relay terminals 5 and 7
- to rear window defogger terminal 2.

Rear window defogger terminal 1 is grounded through body ground B452.

With power and ground supplied rear window defogger filaments heat and defog the rear window.

When rear window defogger relay is turned to ON

Power is supplied (with mirror defogger)
- through rear window defogger relay terminals 5 and 7
- through fuse block (J/B) terminal 2C
- through 10 A fuse [No.8 located in the fuse block (J/B)]
- through fuse block (J/B) terminal 5B
- to door mirror defogger (Driver side and passenger side) terminal 2.

Door mirror defogger (Driver side and passenger side) terminal 1 is grounded through body grounds M30 and M66.

With power and ground supplied door mirror defogger filaments heat and defog the mirror.

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).

CAN COMMUNICATION UNIT:

CAN COMMUNICATION UNIT / TYPE 1:

TYPE 1:

TYPE 1:

CAN COMMUNICATION UNIT / TYPE 2:

TYPE 2:

TYPE 2:

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.