Telematics System (DTC/Circuit Diagnosis)

WARNING: This page is about a different car, the 2020 Infiniti QX60. However, it is still accessible from the selected car via links, so may be relevant.

CHECK USB CIRCUITS CONTINUITY

Turn ignition switch OFF.
Disconnect TCU connector M184 and display control unit connector M196.

Check continuity between TCU connector M184 and display control unit connector M196.

TCU		Display control unit		Continuity
Connector	Terminal	Connector	Terminal
M184	41	M196	85	Yes
	43		87
	44		88
	45		89
	46		90

Check the continuity between TCU connector M184 and ground.

TCU		Ground	Continuity
Connector	Terminal
M184	41	--	No
	43

Is the inspection result normal?

YES

Replace TCU. Refer to Removal and Installation .

Repair or replace harness or connectors.