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Nissan Sentra B18 (2020-2025) Service Manual: 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)

—

Diagnosis condition

Ignition switch ON

Signal (terminal)

  • Sonar buzzer PWR (terminal 19)

  • Sonar buzzer signal (terminal 18)

Threshold

  • Sonar buzzer power circuit is short to voltage

  • Sonar buzzer signal circuit is short to voltage

Diagnosis delay time

—

B272D–14

Diagnosis condition

Ignition switch ON

Signal (terminal)

  • Sonar buzzer PWR (terminal 19)

  • Sonar buzzer signal (terminal 18)

Threshold

  • Sonar buzzer power circuit is open or short to ground

  • Sonar buzzer signal circuit is open or short to ground

Diagnosis delay time

—

POSSIBLE CAUSE

  • Sonar buzzer PWR open, short to ground, short to voltage

  • Sonar buzzer signal open, short to ground, short to voltage

  • Sonar buzzer

FAIL-SAFE

  • Off indicator blinks periodically (500ms ON, 500ms OFF).

  • Audible warning (sonar buzzer) of all sensors is stopped.

Confirmation Procedure

Confirmation Procedure

  1. 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 B272D 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

  1. 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 B272D–12 or 14 detected?

    YES>>

    12 – GO TO 2.

    YES>>

    14 – GO TO 3.

    NO>>

    Refer to Intermittent Incident.

  2. CHECK SONAR BUZZER CIRCUIT SHORT TO BATTERY

      1. Ignition switch ON.

      2. Check voltage between sonar control unit connector and ground.

        (+)

        (–)

        Voltage

        (Approx.)

        Sonar control unit

        Connector

        Terminal

        B87

        18

        Ground

        0 V

        19

    Is the inspection result normal?

    YES >>

    GO TO 4.

    NO >>

    Repair or replace harness or connectors.

  3. CHECK SONAR BUZZER CIRCUIT OPEN OR SHORT TO GROUND

      1. Ignition switch OFF.

      2. Disconnect sonar control unit and sonar buzzer connectors.

      3. Check continuity between sonar control unit connector and sonar buzzer connector.

        Sonar control unit

        Sonar buzzer

        Continuity

        Connector

        Terminal

        Connector

        Terminal

        B87

        18

        M29

        3

        Yes

        19

        2

      4. Check continuity between sonar control unit connector and ground.

        Sonar control unit

        —

        Continuity

        Connector

        Terminal

        B87

        18

        Ground

        No

        19

    Is the inspection result normal?

    YES >>

    GO TO 4.

    NO >>

    Repair or replace harness or connectors.

  4. CHECK SONAR BUZZER CIRCUIT SIGNAL

      1. Connect sonar control unit and sonar buzzer connectors.

      2. Ignition switch ON.

      3. Check signal between the terminals of sonar control unit connector.

        Sonar control unit

        Condition

        Voltage

        (Approx.)

        Connector

        (+)

        (–)

        Terminal

        Terminal

        B87

        18

        15

        Obstacle detected

        0 – 12 V (variable)

    Is the inspection result normal?

    YES >>

    Replace sonar buzzer. Refer to Removal and Installation.

    NO >>

    Replace sonar control unit. Refer to Removal and Installation.

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