Operation Description

WARNING: This page is about a different car, the 2018 Infiniti Q60. However, it is still accessible from the selected car via links, so may be relevant.

Turn rear window defogger switch ON when the ignition switch turns ON. Then integral switch (rear window defogger switch) transmits rear window defogger switch signal to display control unit. Then display control unit transmits rear window defogger switch signal to BCM via CAN communication.
BCM turns rear window defogger relay ON and transmits rear window defogger control signal to IPDM E/R via CAN communication when rear window defogger switch signal is received.
Rear window defogger and door mirror defogger are supplied with power and operate when rear window defogger relay turns ON.
IPDM E/R transmits rear window defogger control signal to display control unit via CAN communication.
Display control unit transmit rear defogger feedback signal to integral switch (rear window defogger switch) via communication, then rear window defogger indicator is illuminated.