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Nissan Sentra B18 (2020-2025) Service Manual: Headlamp Warning Circuit

Component Function Check

Component Function Check

  1. CHECK HEADLAMP WARNING OPERATION

      1. Ignition switch ON.

      2. Check that headlamp warning on combination meter is not displayed when lighting switch is turned 2ND.

    Is the inspection result normal?

    YES>>

    Headlamp warning circuit is normal.

    NO>>

    Refer to Diagnosis Procedure.

Diagnosis Procedure

Diagnosis Procedure

  1. CHECK HEADLAMP WARNING LAMP SIGNAL CIRCUIT

      1. Ignition switch OFF.

      2. Disconnect front combination lamp connector.

      3. Ignition switch ON.

      4. Check voltage between front combination lamp harness connector and ground.

        (+)

        (–)

        Voltage

        (Approx.)

        Front combination lamp

        Connector

        Terminal

        Ground

        Battery voltage

        RH

        E38

        7

        LH

        E37

    Is the inspection result normal?

    YES >>

    Replace corresponding front combination lamp. Refer to Removal and Installation.

    NO >>

    GO TO 2.

  2. CHECK HEADLAMP WARNING LAMP SIGNAL CIRCUIT

      1. Ignition switch OFF.

      2. Disconnect IPDM E/R connector.

      3. Check continuity between IPDM E/R harness connector and front combination lamp harness connector.

        IPDM E/R

        Front combination lamp

        Continuity

        Connector

        Terminal

        Connector

        Terminal

        RH

        E44

        60

        E38

        7

        Yes

        LH

        E48

        53

        E37

      4. Check continuity between IPDM E/R harness connector and ground.

        IPDM E/R

        (–)

        Continuity

        Connector

        Terminal

        RH

        E44

        60

        Ground

        No

        LH

        E48

        53

    Is the inspection result normal?

    YES>>

    Replace IPDM E/R. Refer to Removal and Installation.

    NO>>

    Repair or replace harness.

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