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Symptoms	Check items	Probable malfunction location
Multifunction switch and preset switch operation does not work.	All switches cannot be operated. "MULTI AV" is displayed on system selection screen when the CONSULT is started.	Multifunction switch power supply and ground circuit malfunction. AV communication circuit between AV control unit and multifunction switch. Perform CONSULT self - diagnosis. Refer to CONSULT FUNCTION .
	All switches cannot be operated. "MULTI AV" is not displayed on system selection screen when the CONSULT is initialized.	AV control unit power supply and ground circuit malfunction. Refer to DIAGNOSIS PROCEDURE .
	Only specified switch cannot be operated.	Multifunction switch or preset switch malfunction. Perform multifunction switch and preset switch self - diagnosis function. Refer to ON BOARD DIAGNOSIS FUNCTION .
Fuel economy display is abnormal.	There is malfunction in the CONSULT "self - diagnosis result" of "MULTI AV". Refer to CONSULT FUNCTION .	Perform detected DTC diagnosis. Refer to DTC INDEX .
Fuel economy display is abnormal.	There is no malfunction in the CONSULT "self - diagnosis results" of "MULTI AV". Refer to CONSULT FUNCTION .	Ignition signal circuit malfunction.
Guide sound is not heard or too low.	On the setting display select "system sound (guide sound volume, etc.)," and confirm that guide sound is ON.	AV control unit malfunction. Replace AV control unit. Refer to REMOVAL AND INSTALLATION .