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Home >> Infiniti >> 2018 >> QX30 Essential, FWD >> Repair and Diagnosis >> Accessories & Equipment >> Headlights >> Exterior Lighting System - Led Headlamp (DTC/Circuit Diagnosis) >> DTC/Circuit Diagnosis >> DTC B1642: Rear Turn Signal Lamp LH Circuit >> Diagnosis Procedure

Diagnosis Procedure

  1. CHECK REAR TURN SIGNAL LAMP LH SIGNAL CIRCUIT 1 
    1. Turn ignition switch OFF.
    2. Disconnect following connectors.
      • Rear combination lamp LH (body side)
      • Rear combination lamp LH (back door side)
      • BCM
    3. Check continuity between BCM harness connector and ground.

      BCM

      Ground

      Continuity

      Connector

      Terminal

      M28

      70

      Not existed

    Is the inspection result normal?

    YES

    GO TO 2.

    NO

    Repair or replace harness.

  2. CHECK REAR TURN SIGNAL LAMP LH SIGNAL CIRCUIT 2 
    1. Check continuity between BCM harness connector and rear combination lamp LH harness connector.
      DTC Body side

      BCM

      Rear combination lamp LH

      Continuity

      Connector

      Terminal

      Connector

      Terminal

      M28

      70

      M194

      4

      Existed

      DTC Back door side

      BCM

      Rear combination lamp LH

      Continuity

      Connector

      Terminal

      Connector

      Terminal

      M28

      70

      M14

      4

      Existed

    2. Check voltage between BCM harness connector and ground.

      (+)

      (-)

      Voltage

      (Approx.)

      BCM

      Connector

      Terminal

      M28

      70

      Ground

      0 V

    Is the inspection result normal?

    YES

    GO TO 3.

    NO

    Repair or replace harness.

  3. ERASE DTC 
    1. Connect following connectors.
      • Rear combination lamp LH (body side)
      • Rear combination lamp LH (back door side)
      • BCM
    2. Turn ignition switch ON.
    3. Select "Self Diagnostic Result" mode of "BCM" using CONSULT.
    4. Erase DTC, and then repeat "DTC CONFIRMATION PROCEDURE". Refer to DTC Description .

    Is DTC detected?

    YES

    GO TO 4.

    NO

    INSPECTION END

  4. REPLACE REAR COMBINATION LAMP LH AND ERASE DTC 
    1. Turn ignition switch OFF.
    2. Replace corresponding rear combination lamp LH. Refer to Removal and Installation (body side) or Removal and Installation (back door side)
    3. Turn ignition switch ON.
    4. Select "Self Diagnostic Result" mode of "BCM" using CONSULT.
    5. Erase DTC, and then repeat "DTC CONFIRMATION PROCEDURE". Refer to DTC Description .

    Is DTC detected?

    YES

    Replace BCM. Refer to Removal and Installation .

    NO

    INSPECTION END