Nissan Sentra B18 (2020-2025) Service Manual / Body Exterior, Doors, Roof & Vehicle Security / Security Control System :: Intelligent Key System / Dtc/circuit Diagnosis / B2090-14 Nats Antenna Amp.

Nissan Sentra B18 (2020-2025) Service Manual: B2090-14 Nats Antenna Amp.

Dtc Description

DTC Description

DTC DETECTION LOGIC

DTC No.	CONSULT screen items (Trouble diagnosis content)	DTC detecting condition
B2090–14	NATS antenna amp. (Nissan anti-theft system antenna amplifier)	Diagnosis condition	Work support ‟INSIDE/OUTSIDE ANT DIAGNOSIS”: activated
		Signal (terminal)	NATS antenna signal
		Threshold	Inactive communication between NATS antenna and Intelligent Key unit
		Diagnosis delay time	1 second or less

POSSIBLE CAUSE

Harness or connectors

(NATS antenna circuit is open or shorted.)
Push-button ignition switch (NATS antenna)
Intelligent Key unit

FAIL-SAFE

—

Confirmation Procedure

Confirmation Procedure

PERFORM DTC CONFIRMATION PROCEDURE
1. CONSULT
  1. Select “INSIDE/OUTSIDE ANT DIAGNOSIS” in “Work support” mode of “HANDS FREE MODULE”.
  2. Select “Self Diagnostic Result” mode of “HANDS FREE MODULE”.
Is the DTC detected?
YES >>
Refer to DTC Diagnosis Procedure.
NO >>
To check malfunction symptom before repair: Refer to Intermittent Incident.
NO >>
Confirmation after repair: Inspection End.

Dtc Diagnosis Procedure

DTC Diagnosis Procedure

CHECK NATS ANTENNA COMMUNICATION SIGNAL

Check signal between push-button ignition switch harness connector and ground using an oscilloscope.

(+)		(–)	Condition		Signal (Reference value)
Push-button ignition switch
Connector	Terminal
M25	2	Ground	Intelligent Key battery is removed and brake pedal is depressed	When a registered Intelligent Key backside is contacted to push-button ignition switch	0 V
	2			Other than above
	3			When a registered Intelligent Key backside is contacted to push-button ignition switch	0 V
	3			Other than above

Is the inspection result normal?

YES >>

GO TO 3.

NO >>

GO TO 2.

CHECK NATS ANTENNA COMMUNICATION SIGNAL CIRCUIT

Ignition switch OFF.
Disconnect Intelligent Key unit connector and push-button ignition switch connector.

Check continuity between push-button ignition switch harness connector and Intelligent Key unit harness connector.

Push-button ignition switch		Intelligent Key unit		Continuity
Connector	Terminal	Connector	Terminal	Continuity
M25	2	M155	19	Yes
M25	3	M155	20	Yes

Check continuity between push-button ignition switch harness connector and ground.

Push-button ignition switch		—	Continuity
Connector	Terminal	—	Continuity
M25	2	Ground	No
M25	3	Ground	No

Is the inspection result normal?

YES >>

GO TO 3.

NO >>

Repair or replace harness.

REPLACE PUSH-BUTTON IGNITION SWITCH
1. Replace push-button ignition switch. Refer to Removal and Installation.
Is the inspection result normal?
YES >>
Inspection End.
NO >>
GO TO 4.
REPLACE INTELLIGENT KEY UNIT
1. Replace Intelligent Key unit. Refer to Removal and Installation.
>>
Inspection End.

 B2070-68 Key Registration

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