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 NATS ANTENNA COMMUNICATION SIGNAL

Check voltage signal between NATS antenna amp. harness connector and ground using an oscilloscope.

(+)		(-)	Condition		Voltage (Approx.)
NATS antenna amp.
Connector	Terminals
M21	1, 3	Ground	Intelligent Key: Intelligent Key battery is removed	Brake pedal: Depressed NOTE: Waveform varies each time when brake pedal is depressed	Courtesy of NISSAN NORTH AMERICA, INC.
				Brake pedal: Released	Battery voltage

Is the inspection result normal?

YES

Replace NATS antenna amp. Refer to Removal and Installation .

GO TO 2 .

CHECK NATS ANTENNA AMP. OUTPUT SIGNAL CIRCUIT

Disconnect NATS antenna amp. connector and BCM connector.

Check continuity between NATS antenna amp. harness connector and BCM connector.

NATS antenna amp.		BCM		Continuity
Connector	Terminal	Connector	Terminal
M21	1	M80	127	Yes
	3		126

Check continuity between NATS antenna amp. harness connector and ground.

NATS antenna amp.		Ground	Continuity
Connector	Terminal
M21	1		No
	3

Is the inspection result normal?

YES

Replace BCM. Refer to Removal and Installation .

Repair or replace harness.