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

Nissan Sentra B18 (2020-2025) Service Manual / Driver Controls / Interior Lighting System :: Dtc/circuit Diagnosis / Interior Room Lamp Battery Saver Output Circuit / Diagnosis Procedure

Diagnosis Procedure

  1. CHECK SYMPTOM

    1. Check symptom (A or B).

      A

      All the following lamps do not turn ON:

      • Front room/map lamp assembly lamp

      • Rear personal lamp

      • Trunk room lamp

      • Vanity mirror lamp LH

      • Vanity mirror lamp RH

      B

      Interior room lamp battery saver does not activate.

    Which symptom is detected?

    A>>

    GO TO 2.

    B>>

    GO TO 6.

  2. CHECK FUSE

      1. Ignition switch OFF.

      2. Check that the following fuses are not blown (open):

      Location

      Fuse No.

      Capacity

      Fuse block (J/B)

      19

      10 A

      36

      10 A

    Are the fuses blown (open)?

    YES>>

    Replace the blown fuse after repairing the affected circuit.

    NO>>

    GO TO 3.

  3. CHECK ROOM LAMP RELAY CIRCUIT 1

      1. Disconnect room lamp relay connector.

      2. Check voltage between room lamp relay harness connector and ground.

        +

        -

        Voltage

        (Approx.)

        Room lamp relay

        Connector

        Terminal

        J-2

        2

        Ground

        Battery voltage

        3

    Is the inspection result normal?

    YES>>

    GO TO 4.

    NO>>

    Repair or replace harnesses.

  4. CHECK ROOM LAMP RELAY 1

    1. Check room lamp relay. Refer to Component Inspection.

    Is the inspection result normal?

    YES>>

    GO TO 5.

    NO>>

    Replace room lamp relay.

  5. CHECK ROOM LAMP RELAY CIRCUIT 2

      1. Disconnect BCM connector.

      2. Check continuity between room lamp relay harness connector and BCM harness connector.

        Room lamp relay

        BCM

        Continuity

        Connector

        Terminal

        Connector

        Terminal

        J-2

        1

        M84

        37

        Yes

    Is the inspection result normal?

    YES>>

    Replace BCM. Refer to Removal and Installation.

    NO>>

    Repair or replace harnesses.

  6. CHECK ROOM LAMP RELAY 2

    Check room lamp relay. Refer to Component Inspection.

    Is the inspection result normal?

    YES>>

    GO TO 7.

    NO>>

    Replace room lamp relay.

  7. CHECK ROOM LAMP RELAY CIRCUIT 4

      1. Disconnect BCM connector M84.

      2. Check continuity between room lamp relay harness connector and ground.

        Room lamp relay

        —

        Continuity

        Connector

        Terminal

        J-2

        1

        Ground

        No

    Is the inspection result normal?

    YES>>

    Replace BCM. Refer to Removal and Installation.

    NO>>

    Repair or replace harnesses.

Interior Room Lamp Battery Saver Output Circuit
...

Component Inspection
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