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Nissan Sentra B18 (2020-2025) Service Manual: B2c20-12 Starter Cut Relay

Dtc Description

DTC Description

DTC DETECTION LOGIC

DTC No.

CONSULT screen items

(Trouble diagnosis content)

DTC detecting condition

B2C20-12

Starter cut relay

(Starter cut relay)

Diagnosis condition

Ignition switch ON

Signal (terminal)

Starter cut relay signal

Threshold

When BCM detects starter cut relay circuit is short to battery

Diagnosis delay time

1 second or less

POSSIBLE CAUSE

  • Harness or connectors

    (Starter cut relay circuit is short to battery)

  • Starter cut relay

FAIL-SAFE

—

Confirmation Procedure

Confirmation Procedure

  1. PERFORM DTC CONFIRMATION PROCEDURE

      1. Ignition switch ON under the following conditions and wait 1 second or more:

        • CVT models

          • Selector lever: In the P position.

          • Brake pedal: Depressed.

        • M/T models

          • Shift lever: In the neutral position.

          • Clutch pedal or Brake pedal: Depressed.

      2. CONSULT

        Select “Self Diagnostic Result” mode of “BCM”.

    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

  1. CHECK STARTER CUT RELAY INPUT SIGNAL

    1. Check voltage between BCM harness connector and ground.

      (+)

      (-)

      Condition

      Voltage

      (Approx.)

      BCM

      Connector

      Terminal

      M142

      123

      Ground

      At engine cranking

      0 V

      Other than above

      Battery voltage

    Is the inspection result normal?

    YES >>

    Inspection End.

    NO >>

    GO TO 2.

  2. CHECK STARTER CUT RELAY INPUT SIGNAL CIRCUIT

      1. Ignition switch OFF.

      2. Disconnect BCM connector and starter cut relay connector.

      3. Check continuity between BCM harness connector and starter cut relay harness connector.

        BCM

        Starter cut relay

        Continuity

        Connector

        Terminal

        Connector

        Terminal

        M142

        123

        H-2

        2

        Yes

      4. Check continuity between BCM harness connector and ground.

        BCM

        —

        Continuity

        Connector

        Terminal

        M142

        123

        Ground

        No

    Is the inspection result normal?

    YES >>

    GO TO 3.

    NO >>

    Repair or replace harness.

  3. CHECK STARTER CUT RELAY

    1. Check starter cut relay. Refer to Component Inspection.

    Is the inspection result normal?

    YES >>

    Inspection End.

    NO >>

    Replace starter cut relay.

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