Operation Description

• A/C switch assembly transmits rear window defogger switch signal to A/C auto amp. when rear window defogger switch turns ON while ignition switch is ON.
• A/C auto amp. transmits rear window defogger switch signal to BCM
• BCM transmits rear window defogger control signal to IPDM E/R via CAN communication.
• IPDM E/R turns rear window defogger relay ON when rear window defogger control signal is received.
• The power is supplied to rear window defogger and door mirror defogger* when rear window defogger relay is ON.
• When rear window defogger is activated, rear window defogger feedback signal is transmitted to A/C switch assembly via A/C auto amp. and the indicator lamp on rear window defogger switch turns on.

*: With door mirror defogger.