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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 B1646: Rear Turn Signal Lamp RH Circuit >> Diagnosis Procedure

Diagnosis Procedure

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

      BCM

      Ground

      Continuity

      Connector

      Terminal

      M27

      58

      Not existed

    Is the inspection result normal?

    YES

    GO TO 2.

    NO

    Repair or replace harness.

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

      BCM

      Rear combination lamp RH

      Continuity

      Connector

      Terminal

      Connector

      Terminal

      M27

      58

      M195

      4

      Existed

      DTC Back door side

      BCM

      Rear combination lamp RH

      Continuity

      Connector

      Terminal

      Connector

      Terminal

      M27

      58

      M15

      4

      Existed

    2. Check voltage between BCM harness connector and ground.

      (+)

      (-)

      Voltage

      (Approx.)

      BCM

      Connector

      Terminal

      M27

      58

      Ground

      0 V

    Is the inspection result normal?

    YES

    GO TO 3.

    NO

    Repair or replace harness.

  3. ERASE DTC 
    1. Connect following connectors.
    2. Turn ignition switch ON.
      • Rear combination lamp RH (body side)
      • Rear combination lamp RH (back door side)
      • BCM
    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 RH AND ERASE DTC 
    1. Turn ignition switch OFF.
    2. Replace corresponding rear combination lamp RH. 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