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DEF-4 < FUNCTION DIAGNOSIS > REAR WINDOW DEFOGGER SYSTEM FUNCTION DIAGNOSIS REAR WINDOW DEFOGGER SYSTEM System Diagram INFOID:0000000005272641 System Description INFOID:0000000005272642 Operation Description • When rear window defogger switch is turned ON while ignition switch is ON, the front air control transmits rear window defogger switch signal to BCM. • BCM transmits rear window defogger control signal to IPDM E/R via CAN communication when rear window defogger operates. • IPDM E/R turns rear window defogger relay and heated mirror relay (if equipped) ON when 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 and heated mirror relay (if equipped) turn ON. • Rear window defogger ON is displayed when signal is received. Timer function • BCM turns rear window defogger relay and heated mirror relay (if equipped) ON for approximately 15 min- utes when rear window defogger switch is turned ON while ignition switch is ON. It makes rear window • Timer is canceled after pressing rear window defogger switch again during timer operation. Then BCM turns rear window defogger relay and heated mirror relay (if equipped) OFF. The same reaction also occurs during INPUT/OUTPUT SIGNAL CHART ALLIA0559GB Switch Input signal to BCM BCM function Actuator Rear window defogger switch Defogger switch signal Rear window defogger & door mirror defogger (if equipped) control Rear window defogger Door mirror defogger (if equipped) Ignition switch Ignition signal |