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. Refer to DIAGNOSIS PROCEDURE . When detecting no malfunction in those components, replace AV control unit. Refer to REMOVAL AND INSTALLATION .
Amplifier	When either one of the following items are detected: sound signal circuits between BOSE amp. and each speaker are malfunctioning. sound signal circuits between BOSE amp. and either front or rear microphone is malfunctioning. BOSE amp. malfunction is detected.	Malfunctioning speaker circuits Malfunctioning front or rear microphone circuits Replace BOSE amp. Refer to REMOVAL AND INSTALLATION .