Diagnosis Procedure

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

CHECK WARNING SYSTEM SWITCH INDICATOR POWER SUPPLY CIRCUIT

Turn ignition switch OFF.
Disconnect warning system switch connector.
Turn ignition switch ON.

Check voltage between warning system switch harness connector and ground.

Terminals			Voltage (Approx.)
(+)		(-)
Warning system switch		Ground
Connector	Terminal
M127	5		Battery voltage

Is the inspection result normal?

YES

GO TO 2 .

Repair the warning system switch indicator power supply circuit.

CHECK WARNING SYSTEM SWITCH INDICATOR SIGNAL FOR OPEN

Turn ignition switch OFF.
Disconnect the ADAS control unit harness connector.
Check continuity between the ADAS control unit harness connector and warning system switch harness connector.

ADAS control unit		Warning system switch		Continuity
Connector	Terminal	Connector	Terminal	Continuity
M128	7	M127	3	Yes

Is the inspection result normal?

YES

GO TO 3 .

Repair the harnesses or connectors.

CHECK WARNING SYSTEM SWITCH INDICATOR SIGNAL CIRCUIT FOR SHORT

Check continuity between the ADAS control unit harness connector and ground.

ADAS control unit		Ground	Continuity
Connector	Terminal
M128	7		No

Is the inspection result normal?

YES

GO TO 4 .

Repair the harnesses or connectors.

CHECK WARNING SYSTEM SWITCH INDICATOR
Check the warning system switch indicator. Refer to Component Inspection .

Is the inspection result normal?

YES

Replace the ADAS control unit. Refer to Removal and Installation .

NO

Replace warning system switch. Removal and Installation .