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DEF-4 < FUNCTION DIAGNOSIS > REAR WINDOW DEFOGGER SYSTEM FUNCTION DIAGNOSIS REAR WINDOW DEFOGGER SYSTEM System Diagram INFOID:0000000001696758 System Description INFOID:0000000001696759 Operation Description • Turn rear window defogger switch ON when the ignition switch is turned ON. Then multifunction switch (rear window defogger switch) transmits rear window defogger switch signal to AV control unit via AV communica- • BCM turns rear window defogger relay ON when rear defogger switch signal is received. 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. • AV control unit transmit rear defogger control signal to multifunction switch (rear window defogger switch) via AV communication. • IPDM E/R transmits rear defogger ON signal to ECM via CAN communication. Timer function • BCM turns rear window defogger relay ON for approximately 15 minutes when rear window defogger switch is turned 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 INPUT/OUTPUT SIGNAL CHART *: With mirror defogger JMLIA0005GB Switch Input signal to BCM BCM function Actuator Rear window defogger switch Defogger switch signal Rear window defogger & Door mir- ror defogger * control Rear window defogger Door mirror defogger * Push button ignition switch Ignition signal |