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.

NOTE: The Signal Tech II Tool [- (J-50190)] can be used to perform the following functions. Refer to the Signal Tech II User Guide for additional information.

Check Intelligent Key relative signal strength.
Confirm vehicle Intelligent Key antenna signal strength.

CHECK INSIDE KEY ANTENNA INPUT SIGNAL 1

Turn ignition switch OFF.

Check signal between BCM harness connector and ground using oscilloscope.

(+)		(-)	Condition	Signal (Reference value)
BCM
Connector	Terminal
M80	123, 124	Ground	When Intelligent Key is in the antenna detection area.	Courtesy of NISSAN NORTH AMERICA, INC.
			When Intelligent Key is not in the antenna detection area.	Courtesy of NISSAN NORTH AMERICA, INC.

Is the inspection result normal?

YES

Replace BCM. Refer to Removal and Installation .

CHECK INSIDE KEY ANTENNA CIRCUIT

Disconnect BCM connector and inside key antenna (instrument center) connector.

Check continuity between BCM harness connector and inside key antenna (instrument center) harness connector.

BCM		Inside key antenna (instrument center)		Continuity
Connector	Terminal	Connector	Terminal
M80	123	M84	1	Yes
	124		2

Check continuity between BCM harness connector and ground.

BCM		Ground	Continuity
Connector	Terminal
M80	123		No
	124

Is the inspection result normal?

YES

Repair or replace harness.

CHECK INSIDE KEY ANTENNA INPUT SIGNAL 2

Replace inside key antenna (instrument center) (New antenna or other antenna).
Connect BCM connector and inside key antenna (instrument center) connector.

Check signal between BCM harness connector and ground using oscilloscope.

(+)		(-)	Condition	Signal (Reference value)
BCM
Connector	Terminal
M80	123, 124	Ground	When Intelligent Key is in the antenna detection area.	Courtesy of NISSAN NORTH AMERICA, INC.
			When Intelligent Key is not in the antenna detection area.	Courtesy of NISSAN NORTH AMERICA, INC.

Is the inspection result normal?

YES

Replace inside key antenna (instrument center).

Replace BCM. Refer to Removal and Installation .