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WARNING: This page is about a different car, the 2011 Infiniti G37. However, it is still accessible from the selected car via links, so may be relevant.

SYMPTOM CHART

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-III is started.	Multifunction switch power supply and ground circuit malfunction. AV communication circuit between AV control unit and multifunction switch. Perform CONSULT-III self-diagnosis. Refer to "CONSULT - III FUNCTION ".
	All switches cannot be operated. "MULTI AV" is not displayed on system selection screen when the CONSULT-III is initialized.	AV control unit power supply and ground circuit malfunction. Refer to "AV CONTROL UNIT : 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, vehicle setting operation is abnormal.	There is malfunction in the CONSULT-III "self-diagnosis result" of "MULTI AV". Refer to "CONSULT - III FUNCTION ".	Perform detected DTC diagnosis. Refer to "DTC INDEX ".
	There is no malfunction in the CONSULT-III "self-diagnosis results" of "MULTI AV". Refer to "CONSULT - III 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 "EXPLODED VIEW ".