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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 B170B: Back-Up Lamp RH Circuit >> Diagnosis Procedure

Diagnosis Procedure

  1. CHECK BACK-UP LAMP RH SIGNAL CIRCUIT 1 
    1. Turn ignition switch OFF.
    2. Disconnect BCM and rear combination lamp RH (back door side) connector.
    3. Check continuity between BCM harness connector and ground.

      BCM

      Ground

      Continuity

      Connector

      Terminal

      M28

      71

      Not existed

    Is the inspection result normal?

    YES

    GO TO 2.

    NO

    Repair or replace harness.

  2. CHECK BACK-UP LAMP RH SIGNAL CIRCUIT 2 
    1. Check continuity between BCM harness connector and rear combination lamp RH (back door side) harness connector.

      BCM

      Rear combination lamp RH (back door side)

      Continuity

      Connector

      Terminal

      Connector

      Terminal

      M28

      71

      M15

      2

      Existed

    2. Check voltage between BCM harness connector and ground.

      (+)

      (-)

      Voltage

      (Approx.)

      BCM

      Connector

      Terminal

      M28

      71

      Ground

      0 V

    Is the inspection result normal?

    YES

    GO TO 3.

    NO

    Repair or replace harness.

  3. ERASE DTC 
    1. Connect BCM and rear combination lamp RH (back door side) connector.
    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 RH (BACK DOOR SIDE) AND ERASE DTC 
    1. Turn ignition switch OFF.
    2. Replace rear combination lamp RH (back door side). Refer to Removal and Installation .
    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