Nissan Sentra B18 (2020-2025) Service Manual / Driver Information & Multimedia / Sonar System :: Dtc/circuit Diagnosis / B2721 Center Sensor [rl]

Nissan Sentra B18 (2020-2025) Service Manual: B2721 Center Sensor [rl]

Dtc Description

DTC Description

DTC DETECTION LOGIC

DTC No.	CONSULT screen terms (Trouble diagnosis content)		DTC detection condition
B2721–60	CENTER SENSOR [RL] (Rear sonar sensor LH inner)	—	Diagnosis condition	When ignition switch is ON
			Signal (terminal)	—
			Threshold	Rear sonar sensor LH inner internal failure (reset error)
			Diagnosis delay time	—
B2721–61			Diagnosis condition	When ignition switch is ON
			Signal (terminal)	—
			Threshold	Rear sonar sensor LH inner internal failure (configuration error)
			Diagnosis delay time	—
B2721–62			Diagnosis condition	When ignition switch is ON
			Signal (terminal)	—
			Threshold	Rear sonar sensor LH inner internal failure (power supply error)
			Diagnosis delay time	—
B2721–63			Diagnosis condition	When ignition switch is ON
			Signal (terminal)	—
			Threshold	Rear sonar sensor LH inner internal failure (self diag result)
			Diagnosis delay time	—
B2721–65			Diagnosis condition	When ignition switch is ON
			Signal (terminal)	—
			Threshold	Rear sonar sensor LH inner internal failure (over temperature)
			Diagnosis delay time	—
B2721–66			Diagnosis condition	When ignition switch is ON
			Signal (terminal)	Rear inner left sensor signal (terminal 21)
			Threshold	Rear inner left sensor signal circuit is open or short to ground
			Diagnosis delay time	—
B2721–67			Diagnosis condition	When ignition switch is ON
			Signal (terminal)	—
			Threshold	Rear sonar sensor LH inner internal failure (diag dump error)
			Diagnosis delay time	—
B2721–68			Diagnosis condition	When ignition switch is ON
			Signal (terminal)	—
			Threshold	Rear sonar sensor LH inner internal failure (resonator error)
			Diagnosis delay time	—
B2721–83			Diagnosis condition	When ignition switch is ON
			Signal (terminal)	—
			Threshold	Rear sonar sensor LH inner internal failure (CRC error)
			Diagnosis delay time	—
B2721–92			Diagnosis condition	When ignition switch is ON
			Signal (terminal)	—
			Threshold	Rear sonar sensor LH inner internal failure (membrane error)
			Diagnosis delay time	—

POSSIBLE CAUSE

Harness or connectors
Rear sonar sensor LH inner

FAIL-SAFE

Obstacle detection of rear sonar sensor LH inner is stopped
Audible warning (sonar buzzer) of all sensors is stopped
Sonar buzzer sounds for 3 seconds

Dtc Confirmation Procedure

DTC Confirmation Procedure

DTC CONFIRMATION PROCEDURE
1. CONSULT
  1. Ignition switch ON.
  2. Ignition switch OFF and wait at least 30 seconds.
  3. Ignition switch ON and wait at least 2 seconds or more.
  4. Select “Self Diagnostic Result” mode of “SONAR”.
Is DTC B2721 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

DETERMINE MALFUNCTION TYPE
1. CONSULT
  1. Ignition switch ON.
  2. Select “Self Diagnostic Result” mode of “SONAR”.
  3. Check DTC.
Is DTC B2721–60, 61, 62, 63, 65, 66, 67, 68, 83 or 92 detected?
YES >>
66 – GO TO 2.
YES >>
60, 61, 62, 63, 65, 67, 68, 83 or 92 – GO TO 5.
NO >>
Refer to Intermittent Incident.

CHECK REAR SONAR SENSOR LH INNER SIGNAL CIRCUIT FOR OPEN OR SHORT TO GROUND

Ignition switch OFF.
Disconnect sonar control unit and rear sonar sensor LH inner connectors.

Check continuity between sonar control unit connector and rear sonar sensor LH inner connector.

Sonar control unit		Rear sonar sensor LH inner		Continuity
Connector	Terminal	Connector	Terminal	Continuity
B87	21	B403	2	Yes

Check continuity between sonar control unit connector and ground.

Sonar control unit		—	Continuity
Connector	Terminal	—	Continuity
B87	21	Ground	No

Is the inspection result normal?

YES >>

GO TO 3.

NO >>

Repair or replace harness or connectors.

CHECK REAR SONAR SENSOR LH INNER GROUND CIRCUIT FOR OPEN

Ignition switch OFF.

Check continuity between sonar control unit connector and rear sonar sensor LH inner connector.

Sonar control unit		Rear sonar sensor LH inner		Continuity
Connector	Terminal	Connector	Terminal	Continuity
B87	14	B403	1	Yes

Is the inspection result normal?

YES >>

GO TO 4.

NO >>

Repair or replace harness or connectors.

CHECK REAR SONAR SENSOR LH INNER SIGNAL

Connect sonar control unit and rear sonar sensor LH inner connectors.
Ignition switch ON.

Check signal between the terminals of sonar control unit connector.

Sonar control unit			Condition
Connector	(+)	(–)
Connector	Terminal	Terminal
B87	21	14	Sensor signal input

Is the inspection result normal?

YES >>

Replace sonar control unit. Refer to Removal and Installation.

NO >>

Replace rear sonar sensor LH inner. Refer to Removal and Installation.

PERFORM DTC CONFIRMATION PROCEDURE AGAIN
1. CONSULT
  1. Ignition switch ON.
  2. Erase DTC.
  3. Select “Self Diagnostic Result” mode of “SONAR”.
  4. Check DTC.
Is DTC B2721–60, 61, 62, 63, 65, 67, 68, 83, or 92 detected?
YES >>
Replace rear sonar sensor LH inner. Refer to Removal and Installation.
NO >>
Inspection End.

 B2720 Corner Sensor [rl]

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 B2722 Center Sensor [rr]

Dtc Description DTC Description DTC DETECTION LOGIC DTC No. CONSULT screen terms (Trouble diagnosis content) DTC detection condition B2722–60 CENTER SENSOR [RR] (Rear sonar se...

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