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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 U141E: Communication Error >> Diagnosis Procedure

Diagnosis Procedure

  1. CHECK FUSE 
    1. Turn ignition switch OFF.
    2. Check that the following fuse is not blown (open).

      Unit

      Location

      Fuse No.

      Capacity

      Rotary light switch

      Fuse and fusible link block 2

      89

      5A

    Is the fuse blown (open)?

    YES

    Replace the blown (open) fuse after repairing the affected circuit if a fuse is blown (open).

    NO

    GO TO 2.

  2. CHECK ROTARY LIGHT SWITCH POWER SUPPLY 

    Check voltage between rotary light switch harness connector and ground.

    (+)

    (-)

    Voltage

    (Approx.)

    Rotary light switch

    Connector

    Terminal

    M219

    4

    Ground

    Battery voltage

    Is the inspection result normal?

    YES

    GO TO 3.

    NO

    Repair or replace harness.

  3. CHECK ROTARY LIGHT SWITCH GROUND CIRCUIT 
    1. Disconnect BCM and rotary light switch connector.
    2. Check continuity between BCM harness connector and rotary light switch harness connector.

      BCM

      Rotary light switch

      Continuity

      Connector

      Terminal

      Connector

      Terminal

      M25

      7

      M219

      2

      Existed

    3. Check continuity between rotary light switch harness connector and ground.

      Rotary light switch

      Ground

      Continuity

      Connector

      Terminal

      M219

      2

      Not existed

    Is the inspection result normal?

    YES

    GO TO 4.

    NO

    Repair or replace harness.

  4. CHECK ROTARY LIGHT SWITCH SIGNAL CIRCUIT 
    1. Check continuity between BCM harness connector and rotary light switch harness connector.

      BCM

      Rotary light switch

      Continuity

      Connector

      Terminal

      Connector

      Terminal

      M25

      1

      M219

      8

      Existed

      2

      7

      3

      6

      4

      5

      5

      3

    2. Check continuity between rotary light switch harness connector and ground.

      Rotary light switch

      Ground

      Continuity

      Connector

      Terminal

      M219

      8

      Not existed

      7

      6

      5

      3

    Is the inspection result normal?

    YES

    GO TO 5.

    NO

    Repair or replace harness.

  5. CHECK ROTARY LIGHT SWITCH SIGNAL CIRCUIT 

    Check voltage between rotary light switch harness connector and ground.

    (+)

    (-)

    Voltage

    (Approx.)

    Rotary light switch

    Connector

    Terminal

    M219

    8

    Ground

    0 V

    7

    6

    5

    3

    Is the inspection result normal?

    YES

    GO TO 6.

    NO

    Repair or replace harness.

  6. ERASE DTC 
    1. Connect BCM and rotary light switch 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 7.

    NO

    INSPECTION END

  7. REPLACE ROTARY LIGHT SWITCH AND ERASE DTC 
    1. Turn ignition switch OFF.
    2. Replace rotary light switch. 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