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

Component Function Check

Component Function Check

  1. CHECK TURN SIGNAL LAMP OPERATION

    1. CONSULT

      1. Select “FLASHER” in "Active Test" mode of “BCM(FLASHER)".

      2. With operating the test item, check that the turn signal lamp is blinks.

        RH

        : Turn signal lamp RH blink

        LH

        : Turn signal lamp LH blink

        LH/RH

        : Turn signal lamp LH and RH blink

    Is the inspection result normal?

    YES>>

    Turn signal lamp circuit is normal.

    NO>>

    Refer to Diagnosis Procedure.

Diagnosis Procedure

Diagnosis Procedure

  1. CHECK TURN SIGNAL LAMP BULB

    1. Check the turn signal lamp bulb. Refer to Component Inspection.

    Is the inspection result normal?

    YES >>

    GO TO 2.

    NO >>

    Front turn signal lamp: Replace corresponding front combination lamp bulb. Refer to Bulb Replacement.

    NO >>

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

    NO >>

    Side turn signal lamp: Replace corresponding door mirror turn signal lamp. Refer to Removal and Installation.

  2. CHECK SYMPTOM

    1. Check symptom (A or B)

      Symptom

      A

      All of turn signal lamp do not blink

      B

      Applicable side performs high flasher activation

    Which symptom is detected?

    A>>

    GO TO 3.

    B>>

    GO TO 5.

  3. CHECK FUSE

      1. Ignition switch OFF.

      2. Check if the following BCM fuses are blown:

        Component

        Location

        Fuse No.

        Capacity

        BCM

        Fuse block (J/B)

        41

        5 A

        32

        10 A

    Is the fuse blown (open)?

    YES >>

    Replace the blown fuse after repairing the affected circuit.

    NO >>

    GO TO 4.

  4. CHECK BCM POWER SUPPLY (TURN SIGNAL LAMP)

      1. Disconnect BCM connector.

      2. Check voltage between BCM harness connector and ground.

        +

        -

        Voltage

        (Approx.)

        BCM

        Connector

        Terminal

        M84

        7

        Ground

        Battery voltage

        M20

        133

    Is the inspection result normal?

    YES >>

    Replace BCM. Refer to Removal and Installation.

    NO >>

    Repair or replace harness.

  5. CHECK TURN SIGNAL LAMP OUTPUT VOLTAGE

      1. Ignition switch OFF.

      2. Disconnect the following connectors:

        • Front combination lamp LH

        • Front combination lamp RH

        • Door mirror LH

        • Door mirror RH

        • Rear combination lamp LH (body side)

        • Rear combination lamp RH (body side)

      3. Ignition switch ON.

      4. With operating the turn signal switch, check voltage between BCM harness connector and ground.

        Front turn signal lamp

        +

        -

        Condition

        Voltage

        (Approx.)

        BCM

        Connector

        Terminal

        RH

        M142

        116

        Ground

        Turn signal switch

        Right

        Blinking : Battery voltage

        Center

        0V

        LH

        128

        Left

        Blinking : Battery voltage

        Center

        0V
        Side turn signal lamp

        +

        -

        Condition

        Voltage

        (Approx.)

        BCM

        Connector

        Terminal

        RH

        M84

        1

        Ground

        Turn signal switch

        Right

        Blinking : Battery voltage

        Center

        0V

        LH

        21

        Left

        Blinking : Battery voltage

        Center

        0V
        Rear turn signal lamp

        +

        -

        Condition

        Voltage

        (Approx.)

        BCM

        Connector

        Terminal

        RH

        M21

        159

        Ground

        Turn signal switch

        Right

        Blinking : Battery voltage

        Center

        0V

        LH

        151

        Left

        Blinking : Battery voltage

        Center

        0V

    Is the inspection result normal?

    YES >>

    GO TO 7.

    NO >>

    GO TO 6.

  6. CHECK TURN SIGNAL LAMP POWER SUPPLY CIRCUIT (SHORT)

      1. Ignition switch OFF.

      2. Disconnect BCM connector.

      3. Check continuity between BCM harness connector and ground.

        Front turn signal lamp

        BCM

        —

        Continuity

        Connector

        Terminal

        RH

        M142

        116

        Ground

        No

        LH

        128
        Side turn signal lamp

        BCM

        —

        Continuity

        Connector

        Terminal

        RH

        M84

        1

        Ground

        No

        LH

        21
        Rear turn signal lamp

        BCM

        —

        Continuity

        Connector

        Terminal

        RH

        M21

        159

        Ground

        No

        LH

        151

    Is the inspection result normal?

    YES >>

    Replace BCM. Refer to Removal and Installation.

    NO >>

    Repair or replace harness.

  7. CHECK TURN SIGNAL LAMP POWER SUPPLY CIRCUIT (OPEN)

      1. Ignition switch OFF.

      2. Disconnect BCM connector.

      3. Check continuity between BCM harness connector and each turn signal lamp harness connector.

        Front turn signal lamp

        BCM

        Front combination lamp

        Continuity

        Connector

        Terminal

        Connector

        Terminal

        RH

        M142

        116

        E20

        4

        Yes

        LH

        128

        E21
        Side turn signal lamp (with Intelligent Around View® Monitor)

        BCM

        Door mirror

        Continuity

        Connector

        Terminal

        Connector

        Terminal

        RH

        M84

        1

        D106

        11

        Yes

        LH

        21

        D7
        Side turn signal lamp (without Intelligent Around View® Monitor)

        BCM

        Door mirror

        Continuity

        Connector

        Terminal

        Connector

        Terminal

        RH

        M84

        1

        D113

        1

        Yes

        LH

        21

        D4
        Rear turn signal lamp

        BCM

        Rear combination lamp (body side)

        Continuity

        Connector

        Terminal

        Connector

        Terminal

        RH

        M21

        159

        B42

        1

        Yes

        LH

        151

        B25

    Is the inspection result normal?

    YES >>

    GO TO 8.

    NO >>

    Repair or replace harness.

  8. CHECK TURN SIGNAL LAMP GROUND CIRCUIT

    1. Check continuity between each turn signal lamp harness connector and ground.

      Front turn signal lamp

      Front combination lamp

      —

      Continuity

      Connector

      Terminal

      RH

      E20

      2

      Ground

      Yes

      LH

      E21
      Side turn signal lamp (with Intelligent Around View® Monitor)

      Door mirror

      —

      Continuity

      Connector

      Terminal

      RH

      D106

      12

      Ground

      Yes

      LH

      D7
      Side turn signal lamp (without Intelligent Around View® Monitor)

      Door mirror

      —

      Continuity

      Connector

      Terminal

      RH

      D113

      5

      Ground

      Yes

      LH

      D4
      Rear turn signal lamp

      Rear combination lamp (body side)

      —

      Continuity

      Connector

      Terminal

      RH

      B42

      4

      Ground

      Yes

      LH

      B25

    Is the inspection result normal?

    YES >>

    Front turn signal lamp: Replace corresponding front combination lamp bulb. Refer to Bulb Replacement.

    YES >>

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

    YES >>

    Side turn signal lamp: Replace corresponding door mirror turn signal lamp. Refer to Removal and Installation.

    NO >>

    Repair or replace harness.

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