Diagnosis Procedure

WARNING: This page is about a different car, the 2018 Nissan Maxima. However, it is still accessible from the selected car via links, so may be relevant.

CHECK TCU USB HARNESS
Visually inspect TCU USB harness.

Is the inspection result normal?

YES

GO TO 2.

NO

Replace TCU USB harness.

CHECK CONTINUITY OF TCU USB HARNESS

Turn the ignition switch OFF.
Disconnect AV control unit connector M158 and TCU connector M193.

Check continuity between AV control unit connector M158 and TCU connector M193.

AV control unit		TCU		Continuity
Connector	Terminal	Connector	Terminal
M158	82	M193	41	Yes
	84		43
	85		44
	86		45
	87		46

Check continuity between AV control unit connector M158 and ground.

AV control unit		Ground	Continuity
Connector	Terminal
M158	82	-	No
	85

Is the inspection result normal?

YES

Replace AV control unit. Refer to Removal and Installation .

Repair or replace harness or connectors.