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Home >> Infiniti >> 2018 >> QX30 Essential, FWD >> Repair and Diagnosis >> Accessories & Equipment >> Exterior Lights >> Exterior Lighting System - Led Headlamp (DTC/Circuit Diagnosis) >> DTC/Circuit Diagnosis >> DTC U118A: Communication Error >> Diagnosis Procedure

Diagnosis Procedure

  1. CHECK DTC WITH HEADLAMP CONTROL UNIT LH 

    Check that DTC is not detected with headlamp control unit LH.

    Is the inspection result normal?

    YES

    GO TO 2.

    NO

    Refer to DTC Index .

  2. CHECK CAN COMMUNICATION SYSTEM DIAGNOSIS 

    Perform the trouble diagnosis for CAN communication system. Refer to Trouble Diagnosis Flow Chart .

    Is the inspection result normal?

    YES

    GO TO 3.

    NO

    Repair or replace harness.

  3. REPLACE HEADLAMP CONTROL UNIT LH AND ERASE DTC 
    1. Turn ignition switch OFF.
    2. Replace front combination lamp LH. Refer to Removal and Installation .
    3. Turn ignition switch ON.
    4. Select "Self Diagnostic Result" mode of "H/L control module RH" using CONSULT.
    5. Erase DTC, and then repeat "DTC CONFIRMATION PROCEDURE". Refer to DTC Description .

    Is DTC detected?

    YES

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

    NO

    INSPECTION END

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