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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.

U1300 is indicated when malfunction occurs in communication signal of multi AV system. Indicated simultaneously, without fail, with the malfunction of control units connected to AV control unit with communication line. Determine the possible malfunction cause from the table below.

SELF-DIAGNOSIS RESULTS DISPLAY ITEM

DTC	Display contents of CONSULT-III	DTC Detection Condition	Possible causes
U1300 U1240	AV COMM CIRCUIT [U1300] SWITCH CONN [U1240]	When either one of the following items is detected: multifunction switch power supply and ground circuits are malfunctioning. AV communication signal between AV control unit and multifunction switch is malfunctioning.	Multifunction switch power supply and ground circuits.
U1300 U1256	AV COMM CIRCUIT [U1300] HAND FREE CONN [U1256]	When either one of the following items is detected: TEL adapter unit power supply and ground circuits are malfunctioning. AV communication circuits between AV control unit and TEL adapter unit are malfunctioning. AV communication signal between AV control unit and TEL adapter unit is malfunctioning.	TEL adapter unit power supply and ground circuits. AV communication circuits between multifunction switch and TEL adapter unit.
U1300 U1240 U1256	AV COMM CIRCUIT [U1300] SWITCH CONN [U1240] HAND FREE CONN [U1256]	Malfunction is detected in AV communication circuits.	AV communication circuits between AV control unit and multifunction switch. Check and repair the short circuit in AV communication circuits.