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WARNING: This page is about a different car, the 2008 Infiniti M45 and 2008 Infiniti M35. However, it is still accessible from the selected car via links, so may be relevant.

Trouble diagnosis chart by symptom

SYMPTOM TABLE

Symptoms	Check items	Possible malfunction location / Action to take
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. AV communication circuit between AV control unit and multifunction switch. Perform CONSULT-III self-diagnosis. Refer to CONSULT-III FUNCTION (MULTI AV) .
	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 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 DIAGNOSIS DESCRIPTION .
Rear control switch operation dose not work.	There is malfunction in the on board-diagnosis result.	Perform on board-diagnosis. Refer to DIAGNOSIS DESCRIPTION .
Rear control switch operation dose not work.	Only specified switch cannot be operated.	Rear control switch malfunction. Replace rear control switch. Refer to REMOVAL AND INSTALLATION .
Fuel economy display, vehicle setting operation is abnormal.	There is malfunction in the CONSULT-III self-diagnosis result.	Perform detected DTC self-diagnosis. Refer to CONSULT-III FUNCTION (MULTI AV) .
	There is no malfunction in the self-diagnosis results.	AV control unit Ignition signal circuit malfunction. Refer to DIAGNOSIS PROCEDURE .
Guide sound is not heard.	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 .