Nissan Sentra B18 (2020-2025) Service Manual: Dtc Diagnosis Procedure

Nissan Sentra B18 (2020-2025) Service Manual / Driver Information & Multimedia / Sonar System :: Dtc/circuit Diagnosis / B273b Rear Sensor Power / 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 the DTC.
Is DTC B273B–11, 12 or 87 detected?
YES >>
11 – GO TO 2.
YES >>
12 – GO TO 3.
YES >>
87 – GO TO 4.
NO >>
Refer to Intermittent Incident.

CHECK REAR SENSOR POWER SUPPLY CIRCUIT FOR SHORT TO GROUND

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

Check continuity between sonar control unit connector and ground.

Sonar control unit		—	Continuity
Connector	Terminal	—	Continuity
B87	23	Ground	No

Is the inspection result normal?

YES >>

Replace sonar control unit. Refer to Removal and Installation.

NO >>

Repair or replace harness or connectors.

CHECK REAR SENSOR POWER SUPPLY FOR SHORT TO VOLTAGE

Ignition switch OFF.
Disconnect sonar control unit and all rear sonar sensor connectors.
Ignition switch ON.

Check the voltage between sonar control unit connector and ground.

(+)	(-)	Voltage (Approx.)
B87	23	Ground	0 V

(+)

(-)

Voltage

(Approx.)

Sonar control unit

Connector

Terminal

B87

Ground

0 V

Is the inspection result normal?

YES >>

Replace sonar control unit. Refer to Removal and Installation.

NO >>

Repair or replace harness or connectors.

CHECK SONAR CONTROL UNIT AND REAR SENSOR CONNECTORS
1. Check the terminals and connectors of each rear sonar sensor and sonar control unit for damage, bends and looseness.
Is the inspection result normal?
YES >>
GO TO 5.
NO >>
Repair or replace harness or connectors.

CHECK REAR SENSOR POWER SUPPLY CIRCUIT FOR OPEN

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

Check continuity between sonar control unit connector and rear sonar sensor connectors.

Sonar control unit		Rear sonar sensors		Continuity
Connector	Terminal	Connector	Terminal	Continuity
B87	23	B402 (rear sonar sensor LH outer)	3	Yes
		B401 (rear sonar sensor RH outer)
		B403 (rear sonar sensor LH inner)
		B404 (rear sonar sensor RH inner)

Is the inspection result normal?

YES >>

GO TO 6.

NO >>

Repair or replace harness or connectors.

CHECK INTERMITTENT INCIDENT
1. Perform intermittent incident. Refer to Intermittent Incident.
Is the inspection result normal?
YES >>
Replace sonar control unit. Refer to Removal and Installation.
NO >>
Repair or replace the applicable malfunctioning components.

Dtc Confirmation Procedure

DTC Confirmation Procedure DTC CONFIRMATION PROCEDURE CONSULT Ignition switch ON. ...

U0073 Control Module Comm Bus a Off

...

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