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BLOWER FAN ON SIGNAL HAC-79 < DTC/CIRCUIT DIAGNOSIS > [AUTOMATIC AIR CONDITIONING] C D E F G H J K L M A B HAC N O P BLOWER FAN ON SIGNAL Component Function Check INFOID:0000000012200067 1. CHECK BLOWER FAN ON SIGNAL With CONSULT 1. Turn ignition switch ON. 2. Select “AIR CONDITIONER” of “BCM” using CONSULT. 3. Select “FAN ON SIG” in “DATA MONITOR” mode. 4. Check blower fan ON signal when the fan control dial is operated. Is the inspection result normal? YES >> INSPECTION END NO >> Refer to Diagnosis Procedure INFOID:0000000012200068 1. CHECK BLOWER FAN ON SIGNAL 1. Turn ignition switch OFF. 2. Disconnect A/C auto amp. harness connector. 3. Turn ignition switch ON. 4. Check output waveform between A/C auto amp. and ground with using oscilloscope. Is the inspection result normal? YES >> Replace A/C auto amp. Refer to HAC-93, "Removal and Installation" NO >> GO TO 2. 2. CHECK BLOWER FAN ON SIGNAL CIRCUIT FOR OPEN 1. Turn ignition switch OFF. 2. Disconnect BCM connector. 3. Check continuity A/C auto amp. harness connector and BCM harness connector. Is the inspection result normal? YES >> GO TO 3. NO >> Repair harness or connector. 3. CHECK BLOWER FAN ON SIGNAL CIRCUIT FOR SHORT Monitor item Condition Status FAN ON SIG Blower motor ON On OFF OFF + − Output waveform A/C auto amp. Connector Terminal M50 14 Ground PKIB4960J A/C auto amp. BCM Continuity Connector Terminal Connector Terminal M50 14 M68 28 Existed |