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Home >> Lexus >> 2023 >> LS 500 Base, RWD >> Repair and Diagnosis >> Accessories & Equipment >> Exterior Lights >> Lighting System (Ext) - Diagnostic Codes (3 Of 3), Symptom Tests & Circuit Tests (1 Of 2) >> Lighting System >> Parking Light/Daytime Running Light Circuit [10/2023 - ] >> Procedure

Parking Light/Daytime Running Light Circuit [10/2023 - ]: Procedure

  1. CHECK LIGHTS 
    1. Check the illumination of each parking lights and daytime running lights.

      Result

      Result Proceed to
      LH side parking light and daytime running light does not illuminate. A
      RH side parking light and daytime running light does not illuminate. B

    Result: 

    See step  4

    Result: 

    See step  2

  2. PERFORM ACTIVE TEST USING GTS 
    1. Perform the Active Test according to the display on the GTS.

      Body Electrical > Headlight Control > Active Test 

      Tester Display Measurement Item Control Range Diagnostic Note
      Daytime Running Light Daytime running light state ON -
      Clearance Light (+ Front Side Marker Light) Clearance light state ON -

      Body Electrical > Headlight Control > Active Test 

      Tester Display
      Daytime Running Light

      Body Electrical > Headlight Control > Active Test 

      Tester Display
      Clearance Light (+ Front Side Marker Light)

      OK

      Clearance lights and daytime running lights illuminate.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to  PROBLEM SYMPTOMS TABLE [10/2023 - ] 

    Result: 

    NG 

    See step  3

  3. CHECK HEADLIGHT UNIT ASSEMBLY LH 
    1. Interchange the headlight unit assembly LH with RH and connect the connectors to them.

      Refer to DISASSEMBLY [10/2020 - ]

    2. Check that the parking light and daytime running light operate normally.

      Refer to OPERATION CHECK [10/2023 - ]

      Result

      Result Proceed to
      LH side parking light and daytime running light does not illuminate. A
      RH side parking light and daytime running light does not illuminate. B

    Result: 

    REPLACE HEADLIGHT ECU SUB-ASSEMBLY LH. Refer to  REMOVAL [10/2020 - ] 

    Result: 

    REPLACE HEADLIGHT UNIT ASSEMBLY LH. Refer to  DISASSEMBLY [10/2020 - ] 

  4. PERFORM ACTIVE TEST USING GTS 
    1. Perform the Active Test according to the display on the GTS.

      Body Electrical > Headlight Control (Sub) > Active Test 

      Tester Display Measurement Item Control Range Diagnostic Note
      Daytime Running Light Daytime running light state ON -
      Clearance Light (+ Front Side Marker Light) Clearance light state ON -

      Body Electrical > Headlight Control (Sub) > Active Test 

      Tester Display
      Daytime Running Light

      Body Electrical > Headlight Control (Sub) > Active Test 

      Tester Display
      Clearance Light (+ Front Side Marker Light)

      OK

      Clearance lights and daytime running lights illuminate.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to  PROBLEM SYMPTOMS TABLE [10/2023 - ] 

    Result: 

    NG 

    See step  5

  5. CHECK HEADLIGHT UNIT ASSEMBLY RH 
    1. Interchange the headlight unit assembly RH with LH and connect the connectors to them.

      Refer to DISASSEMBLY [10/2020 - ]

    2. Check that the parking light and daytime running light operate normally.

      Refer to OPERATION CHECK [10/2023 - ]

      Result

      Result Proceed to
      RH side parking light and daytime running light does not illuminate. A
      LH side parking light and daytime running light does not illuminate. B

    Result: 

    REPLACE HEADLIGHT ECU SUB-ASSEMBLY RH. Refer to  REMOVAL [10/2020 - ] 

    Result: 

    REPLACE HEADLIGHT UNIT ASSEMBLY RH. Refer to  DISASSEMBLY [10/2020 - ]