Nissan Sentra B18 (2020-2025) Service Manual / Driver Information & Multimedia / Sonar System :: Dtc/circuit Diagnosis / B2724 Sonar Contro Unit

Nissan Sentra B18 (2020-2025) Service Manual: B2724 Sonar Contro Unit

Dtc Description

DTC Description

DTC DETECTION LOGIC

DTC No.	CONSULT screen terms (Trouble diagnosis content)		DTC detection condition
B2724–23	SONAR CONTROL UNIT (Sonar control unit)	—	Diagnosis condition	When ignition switch is ON
			Signal (terminal)	—
			Threshold	Sonar ECU internal failure (under voltage)
			Diagnosis delay time	—
B2724–24			Diagnosis condition	When ignition switch is ON
			Signal (terminal)	—
			Threshold	Sonar ECU internal failure (over voltage)
			Diagnosis delay time	—
B2724–44			Diagnosis condition	When ignition switch is ON
			Signal (terminal)	—
			Threshold	Sonar ECU internal failure (RAM error)
			Diagnosis delay time	—
B2724–45			Diagnosis condition	When ignition switch is ON
			Signal (terminal)	—
			Threshold	Sonar ECU internal failure (ROM error)
			Diagnosis delay time	—
B2724–46			Diagnosis condition	When ignition switch is ON
			Signal (terminal)	—
			Threshold	Sonar ECU internal failure (EEPROM error)
			Diagnosis delay time	—
B2724–48			Diagnosis condition	When ignition switch is ON
			Signal (terminal)	—
			Threshold	Sonar ECU internal failure (internal software execution failure)
			Diagnosis delay time	—
B2724–49			Diagnosis condition	When ignition switch is ON
			Signal (terminal)	—
			Threshold	Sonar ECU internal failure (basic chip set failure)
			Diagnosis delay time	—
B2724–55			Diagnosis condition	When ignition switch is ON
			Signal (terminal)	—
			Threshold	Sonar ECU internal failure (not configured)
			Diagnosis delay time	—
B2724–86			Diagnosis condition	When ignition switch is ON
			Signal (terminal)	—
			Threshold	Sonar ECU internal failure (SPI comm failure)
			Diagnosis delay time	—
B2724–87			Diagnosis condition	When ignition switch is ON
			Signal (terminal)	—
			Threshold	Sonar ECU internal failure (high side switch failure)
			Diagnosis delay time	—

POSSIBLE CAUSE

Charging system malfunction
Sonar control unit power supply or ground circuit
Sonar control unit configuration
Sonar control unit

FAIL-SAFE

Off indicator blinks periodically (500ms ON, 500ms OFF).
Sonar buzzer sounds for 3 seconds.

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 B2724 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. 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”.
  5. Check DTC.
Is DTC B2724–23, 24, 44, 45, 46, 48, 49, 55, 86 or 87 detected?
YES >>
23 or 24 – GO TO 2.
YES >>
55 – GO TO 4.
YES >>
44, 45, 46, 48, 49, 86 or 87 – GO TO 5.
NO >>
Refer to Intermittent Incident.
CHECK CHARGING SYSTEM
1. Check the Nissan Sentra vehicle charging system. Refer to Work Flow (With 165-DSS-5000P) or Work Flow (Without 165-DSS-5000P).
Is the inspection result normal?
YES >>
GO TO 3.
NO >>
Repair or replace the malfunctioning components.
CHECK SONAR CONTROL UNIT POWER SUPPLY AND GROUND
1. Perform the sonar control unit power supply and ground circuit diagnosis procedure. Refer to Diagnosis Procedure.
Is the inspection result normal?
YES >>
Replace sonar control unit. Refer to Removal and Installation.
NO >>
Repair or replace harness or connectors.
PERFORM SONAR CONTROL UNIT CONFIGURATION PROCEDURE
1. CONSULT
  
  Perform the sonar control unit configuration procedure. Refer to Work Procedure.
Was the configuration procedure successful?
YES >>
GO TO 5.
NO >>
Replace sonar control unit. Refer to Removal and Installation.
PERFORM DTC CONFIRMATION PROCEDURE AGAIN
1. CONSULT
  1. Erase DTC.
  2. Select “Self Diagnostic Result” mode of “SONAR”.
  3. Check DTC.
Is DTC B2724–23, 24, 44, 45, 46, 48, 49, 55, 86 or 87 detected?
YES >>
Replace sonar control unit. Refer to Removal and Installation.
NO >>
Inspection End.

 B2723 Corner Sensor [rr]

Dtc Description DTC Description DTC DETECTION LOGIC DTC No. CONSULT screen terms (Trouble diagnosis content) DTC detection condition B2723–60 CORNER SENSOR [RR] (Rear sonar se...

 B272d Front Buzzer

Dtc Description DTC Description DTC DETECTION LOGIC DTC No. CONSULT screen terms (Trouble diagnosis content) DTC detection condition B272D–12 FRONT BUZZER (Sonar buzzer) — D...

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