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Nissan Sentra B18 (2020-2025) Service Manual: Stop Lamp Circuit

Component Function Check

Component Function Check

  1. CHECK STOP LAMP OPERATION

      1. Ignition switch ON.

      2. With operating the brake pedal, check that the stop lamp and high-mounted stop lamp is turned ON.

        Depressed

        : Stop lamp and high-mounted stop lamp ON

        Fully released

        : Stop lamp and high-mounted stop lamp OFF

    Is the inspection result normal?

    YES >>

    Stop lamp circuit is normal.

    NO >>

    Refer to Diagnosis Procedure.

Diagnosis Procedure

Diagnosis Procedure

  1. CHECK SYMPTOM

    1. Check symptom (A or B).

      Symptom

      A

      Both stop lamps and the high-mounted stop lamp will not turn ON

      B

      Any of the stop lamps and the high-mounted stop lamp will not turn ON

    Which symptom is detected?

    A>>

    GO TO 2.

    B>>

    GO TO 8.

  2. CHECK FUSE

      1. Ignition switch OFF.

      2. Check if the following fuse is not blown:

        Signal name

        Location

        Fuse No.

        Capacity

        • Battery power supply (stop lamp)

        • Battery power supply (stop lamp switch)

        Fuse block (J/B)

        34

        10 A

    Is the fuse blown (open)?

    YES >>

    Replace the blown fuse after repairing the affected circuit.

    NO >>

    GO TO 3.

  3. CHECK BATTERY POWER SUPPLY (STOP LAMP)

      1. Disconnect BCM connector.

      2. Check voltage between BCM harness connector and ground.

        +

        -

        Voltage

        (Approx.)

        BCM

        Connector

        Terminal

        M20

        139

        Ground

        Battery voltage

    Is the inspection result normal?

    YES >>

    GO TO 4.

    NO >>

    Repair or replace harness.

  4. CHECK STOP LAMP SWITCH POWER SUPPLY

    1. Check voltage between stop lamp switch harness connector and ground.

      +

      -

      Voltage

      (Approx.)

      Stop lamp switch

      Connector

      Terminal

      E60

      1

      Ground

      Battery voltage

    YES >>

    GO TO 5.

    NO >>

    Repair or replace harness.

  5. CHECK STOP LAMP SWITCH SIGNAL

    With operating the brake pedal, check voltage between BCM harness connector and ground.

    +

    -

    Condition

    Voltage

    (Approx.)

    BCM

    Connector

    Terminal

    M142

    110

    Ground

    Ignition switch OFF

    Brake pedal is released

    0V

    Brake pedal is depressed

    Battery voltage

    Is the inspection result normal?

    YES >>

    Replace BCM. Refer to Removal and Installation.

    NO >>

    GO TO 6.

  6. CHECK STOP LAMP SWITCH

    1. Check stop lamp switch. Refer to Component Inspection.

    Is the inspection result normal?

    YES >>

    GO TO 7.

    NO >>

    Repair or replace the malfunctioning part.

  7. CHECK STOP LAMP SWITCH CIRCUIT (OPEN)

      1. Disconnect following connectors:

        • BCM

        • Stop lamp switch

      2. Check continuity between BCM harness connector and stop lamp switch harness connector.

        BCM

        Stop lamp switch

        Continuity

        Connector

        Terminal

        Connector

        Terminal

        M142

        110

        E60

        2

        Yes

    Is the inspection result normal?

    YES >>

    Check intermittent incident. Refer to Intermittent Incident.

    NO >>

    Repair or replace harness.

  8. CHECK STOP LAMP

    1. Check the stop lamp. Refer to Component Inspection.

    Is the inspection result normal?

    YES>>

    GO TO 9.

    NO>>

    Repair or replace the malfunctioning part.

  9. CHECK STOP LAMP / HIGH-MOUNTED STOP LAMP OUTPUT VOLTAGE

    1. CONSULT

      1. Ignition switch ON.

      2. Select “STOP LAMP 1” or “STOP LAMP 2” in “Active Test” mode of "BCM(HEAD LAMP)".

      3. With operating the test items, check voltage between BCM harness connector and ground.

        Stop lamp RH

        +

        -

        Test item

        Voltage

        (Approx.)

        BCM

        Connector

        Terminal

        M21

        157

        Ground

        STOP LAMP 1

        On

        Battery voltage

        Off

        0V
        Stop lamp LH and high-mounted stop lamp

        +

        -

        Test item

        Voltage

        (Approx.)

        BCM

        Connector

        Terminal

        M21

        160

        Ground

        STOP LAMP 2

        On

        Battery voltage

        Off

        0V

    Is the inspection result normal?

    YES >>

    GO TO 11.

    NO >>

    GO TO 10.

  10. CHECK STOP LAMP / HIGH-MOUNTED STOP LAMP POWER SUPPLY CIRCUIT (SHORT)

      1. Ignition switch OFF.

      2. Disconnect following connectors:

        • BCM

        • Rear combination lamp LH (body side)

        • Rear combination lamp RH (body side)

        • High-mounted stop lamp

      3. Check continuity between BCM harness connector and ground.

        Stop lamp RH

        BCM

        —

        Continuity

        Connector

        Terminal

        M21

        157

        Ground

        No
        Stop lamp LH and high-mounted stop lamp

        BCM

        —

        Continuity

        Connector

        Terminal

        M21

        160

        Ground

        No

    Is the inspection result normal?

    YES >>

    Replace BCM. Refer to Removal and Installation.

    NO >>

    Repair or replace harness.

  11. CHECK STOP LAMP / HIGH-MOUNTED STOP LAMP POWER SUPPLY CIRCUIT (OPEN)

      1. Ignition switch OFF.

      2. Disconnect following connectors:

        • BCM

        • Rear combination lamp LH (body side)

        • Rear combination lamp RH (body side)

        • High-mounted stop lamp

      3. Check continuity between BCM harness connector and each stop lamp harness connector.

        Stop lamp

        BCM

        Rear combination lamp (body side)

        Continuity

        Connector

        Terminal

        Connector

        Terminal

        RH

        M21

        157

        B42

        3

        Yes

        LH

        160

        B25
        High-mounted stop lamp

        BCM

        High-mounted stop lamp

        Continuity

        Connector

        Terminal

        Connector

        Terminal

        M21

        160

        B74

        1

        Yes

    Is the inspection result normal?

    YES>>

    GO TO 12.

    NO>>

    Repair or replace harness.

  12. CHECK STOP LAMP / HIGH-MOUNTED STOP LAMP GROUND CIRCUIT

    1. Check continuity between each stop lamp harness connector and ground.

      Stop lamp

      Rear combination lamp (body side)

      —

      Continuity

      Connector

      Terminal

      RH

      B42

      4

      Ground

      Yes

      LH

      B25
      High-mounted stop lamp

      High-mounted stop lamp

      —

      Continuity

      Connector

      Terminal

      B74

      2

      Ground

      Yes

    Is the inspection result normal?

    YES >>

    Stop lamp: Replace corresponding rear combination lamp (body side) bulb. Refer to Bulb Replacement.

    YES >>

    High-mounted stop lamp: Replace the high-mounted stop lamp. Refer to Removal and Installation.

    NO >>

    Repair or replace harness.

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