With Automatic Air Conditioning
WARNING: This page is about a different car, the 2020 Nissan Altima. However, it is still accessible from the selected car via links, so may be relevant.
SYSTEM DIAGRAM
OPERATION DESCRIPTION
- Pressing the rear window defogger switch (integral to A/C switch assembly) when the ignition switch is ON transmits rear window defogger switch signal to the A/C Auto Amp. via LIN2 communication. A/C Auto Amp. transmits rear window defogger switch signal to the BCM via CAN communication.
- The BCM turns rear window defogger relay ON and transmits rear window defogger control signal to A/C Auto Amp. via CAN communication when the rear window defogger switch signal is received.
- Rear window defogger and door mirror defogger (if equipped) are supplied with power and operate when rear window defogger relay turns ON.
- A/C Auto Amp. transmits rear defogger switch feedback signal to A/C Switch Assembly (rear window defogger switch) via LIN2 communication, and the rear window defogger indicator is illuminated.
TIMER FUNCTION
- BCM turns rear window defogger relay ON for approximately 15 minutes when rear window defogger switch turns ON. It makes rear window defogger and door 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.