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AUDIO AV-27 C D E F G H I J L M A B AV Trouble Diagnosis NKS002J9 ● The majority of the audio malfunctions are the result of outside causes (bad CD/cassette, electromagnetic ● The vehicle itself can be a source of noise if noise prevention parts or electrical equipment is malfunction- NOTE: ● Fading noise: This noise occurs because of variations in the field strength in a narrow range due to moun- ● Multi-path noise: This noise results from a time difference between the broadcast waves directly from the Symptom Possible malfunction location Audio system does not work properly. ● Audio unit power supply circuit ● Audio unit No sound can be heard from all speakers. Base system ● Audio unit ● TEL ON signal circuit BOSE system ● BOSE speaker amp. power supply and ground circuit ● BOSE speaker amp. ON signal circuit ● Audio unit ● BOSE speaker amp. ● TEL ON signal circuit No sound can be heard from one or several speakers. Base system ● Audio signal circuit between audio unit and speaker ● Speaker ● Tweeter ● Audio unit BOSE system ● Audio signal circuit between audio unit and BOSE speaker amp. ● Audio signal circuit between BOSE speaker amp. and speaker ● Speaker ● Tweeter ● Audio unit ● BOSE speaker amp. No sound can be heard from woofer. ● Audio signal circuit between BOSE speaker amp. and woofer ● Woofer ● BOSE speaker amp. No sound can be heard from radio or noise is caught. ● Antenna amp. ON signal circuit ● Antenna feeder ● Antenna ● Antenna amp. ● Audio unit |