Heated Glass Element: Description and Operation

FUNCTION DIAGNOSIS

REAR WINDOW DEFOGGER SYSTEM




System Diagram

System Description

Operation Description
- Turn rear window defogger switch ON when the ignition switch is turned ON. Then malfunction switch (rear window defogger switch) transmits rear window defogger switch signal to AV control unit via AV communication. AV control unit transmits rear window defogger switch signal to BCM via CAN communication.
- BCM turns rear window defogger relay ON when rear defogger switch signal is received.
- Rear window defogger and door mirror defogger (with mirror defogger) are supplied with power and operate when rear window defogger relay turns ON.
- BCM transmits rear window defogger control signal to AV control unit via CAN communication when rear window defogger operates.
- Rear window defogger ON is displayed when AV control unit receives signals.

The indicator of the rear window defogger switch also turns ON when rear defogger control signal is transmitted to multifunction switch (rear window defogger switch) with AV communication.

Timer function
- BCM turns rear window defogger relay ON for approximately 15 minutes when rear window defogger switch is turned ON while ignition switch is ON. It makes rear window defogger and door mirror defogger (with mirror defogger) operate.
- Timer is canceled after pressing rear window defogger switch again during timer operation. Then BCM turns rear window defogger relay OFF. The same reaction also occurs during timer operation, if the ignition switch is turned OFF.




INPUT/OUTPUT SIGNAL CHART




Component Description