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NAVIGATION SYSTEM AV-117 C D E F G H I J L M A B AV PANEL SW Multifunction switch power supply and 1. Check multifunction switch power supply and ground circuit. 2. If the results from the above checkup show no mal- function, replace multifunction switch. ● AUDIO HEAD UNIT ● BOSE AMP Malfunction is detected on communication 1. Check communication circuit between multifunction switch and audio unit. 2. If the results from the above checkup show no mal- function, replace either multifunction switch or audio 3. If self-diagnosis results still show any malfunction, replace the other unit. AIR COMP RECEIVER ● Low tire pressure warning control unit ● Malfunction is detected on communica- 1. Check low tire pressure warning control unit power supply and ground circuit. 2. Check communication circuit between multifunction switch and low tire pressure warning control unit. 3. If the results from the above checkup show no mal- function, replace either multifunction switch or low 4. If self-diagnosis results still show any malfunction, replace the other unit. BOSE AMP ● BOSE speaker amp. power supply and ● Malfunction is detected on communica- 1. Check BOSE speaker amp. power supply and ground circuit. 2. Check communication circuit between audio unit and BOSE speaker amp. 3. If the results from the above checkup show no mal- function, replace either audio unit or BOSE speaker 4. If self-diagnosis results still show any malfunction, replace the other unit. AUDIO HEAD UNIT Audio unit power supply and ground circuit 1. Check audio unit power supply circuit. 2. If the results from the above checkup show no mal- function, replace audio unit. Error item Possible cause Action to take |