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Home >> Nissan-Datsun >> 2021 >> Sentra SR >> Repair and Diagnosis >> Accessories & Equipment >> Headlights >> Exterior Lighting System - Led Headlamp (DTC/Circuit Diagnosis) >> DTC/Circuit Diagnosis >> DTC B121A-15: Fr Fog Lamp LH PWR SPLY CIRC >> Diagnosis Procedure

Diagnosis Procedure

  1. CHECK FRONT FOG LAMP LH POWER SUPPLY 1 (SHORT TO POWER SUPPLY) 
    1. Ignition switch OFF.
    2. Turn lighting switch OFF, and front fog lamp switch OFF.
    3. Disconnect IPDM E/R connector and front fog lamp LH connector.
    4. Check voltage between IPDM E/R harness connector and ground.

      IPDM E/R

      --

      Voltage

      (Approx.)

      Connector

      Terminal

      E48

      51

      Ground

      0 V

    Is the inspection result normal?

    YES

    GO TO 2.

    NO

    Repair or replace harness.

  2. CHECK FRONT FOG LAMP LH POWER SUPPLY 2 

    SYMBOL CONSULT

    1. Connect IPDM E/R connector.
    2. Ignition switch ON.
    3. Select "FRONT FOG LAMP" in "Active Test" mode of "IPDM E/R".
    4. With operating the test items, check the voltage between front fog lamp LH harness connector and ground.

      +

      -

      Test item

      Voltage

      (Approx.)

      Front fog lamp LH

      Connector

      Terminal

      E303

      1

      Ground

      FRONT FOG LAMP

      On

      Battery voltage

      Off

      0 V

    Is the inspection result normal?

    YES

    GO TO 3.

    NO

    GO TO 4.

  3. CHECK FRONT FOG LAMP LH GROUND CIRCUIT 
    1. Ignition switch OFF.
    2. Check continuity between front fog lamp LH harness connector and ground.

      Front fog lamp LH

      --

      Continuity

      Connector

      Terminal

      E303

      2

      Ground

      Yes

    Is the inspection result normal?

    YES

    GO TO 5.

    NO

    Repair or replace harness.

  4. CHECK FRONT FOG LAMP LH POWER SUPPLY CIRCUIT 
    1. Ignition switch OFF.
    2. Disconnect IPDM E/R connector.
    3. Check continuity between IPDM E/R harness connector and front fog lamp LH harness connector.

      IPDM E/R

      Front fog lamp LH

      Continuity

      Connector

      Terminal

      Connector

      Terminal

      E48

      51

      E303

      1

      Yes

    Is the inspection result normal?

    YES

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

    NO

    Repair or replace harness.

  5. CHECK FRONT FOG LAMP LH 

    Check the front fog lamp LH. Refer to Component Inspection .

    Is the inspection result normal?

    YES

    Inspection End.

    NO

    Replace front fog lamp LH. Refer to Removal and Installation .