April 5, 2026: LEMON Manuals is launched! Read the announcement.

Self-Diagnosis Results

Check the applicable display at the following table, and then repair the malfunctioning parts.

Only Unit Part Is Displayed In Red.

Screen switch	Description	Possible malfunction location/Action to take
Control unit	Malfunction is detected in AV control unit power supply and ground circuits.	Check AV control unit power supply and ground circuits. When detecting no malfunction in those components, replace AV control unit. Refer to "EXPLODED VIEW ".
Amplifier	When either one of the following items are detected: sound signal circuits between BOSE amp. and each speaker are malfunctioning. BOSE amp. malfunction is detected.	Malfunctioning speaker circuits Replace BOSE amp. Refer to "EXPLODED VIEW ".

A Connecting Cable Between Units Is Displayed In Yellow.

Area with yellow connection lines	Description	Possible malfunction location/Action to take
Control unit <==> Front Display	Malfunction is detected in serial communication circuits between AV control unit and display unit.	Serial communication circuits between AV control unit and display unit.
Control unit <==> SAT	When either one of the following items is detected: satellite radio tuner power supply and ground circuit are malfunctioning. communication circuits between AV control unit and satellite radio tuner are malfunctioning. request signal circuit between AV control unit and satellite radio tuner are malfunctioning.	Satellite radio tuner power supply and ground circuit. Communication circuit between AV control unit and satellite radio tuner. Request signal circuit between AV control unit and satellite radio tuner.
Control unit <==> Sonar	When either one of the following items is detected: sonar control unit power supply and ground circuits are malfunctioning. AV communication circuits between AV control unit and sonar control unit are malfunctioning.	Sonar control unit power supply and ground circuits. AV communication circuits between AV control unit and sonar control unit.
Control unit <==> BTHF	When either one of the following items is detected: TEL adapter unit power supply and ground circuits are malfunctioning. AV communication circuits between BOSE amp. and TEL adapter unit are malfunctioning.	TEL adapter unit power supply and ground circuits. AV communication circuits between BOSE amp. and TEL adapter unit.
Control unit <==> Amplifier	BOSE amp. power supply and ground circuits are malfunctioning.	BOSE amp. power supply and ground circuits.
Control unit <==> BTHF Control unit <==> Amplifier	AV communication circuits between sonar control unit and BOSE amp. are malfunctioning.	AV communication circuits between sonar control unit and BOSE amp.