LIGHTING SYSTEM Automatic Light Control Function does not Operate

WIRING DIAGRAM

A01H0QXE05

INSPECTION PROCEDURE

Note

First perform the communication function inspections in HOW TO PROCEED WITH TROUBLESHOOTING to confirm that there are no CAN communication malfunctions before troubleshooting this symptom.

PROCEDURE


  1. READ VALUE USING GTS (AUTOMATIC LIGHT CONTROL SENSOR)


    1. Using the GTS, read the Data List.

      Main Body
      Tester Display Measurement Item / Range Normal Condition Diagnostic Note
      Illumination Rate Info Condition of automatic light control sensor/0 to 2162.65 ms Condition value will be displayed -
      OK
      Condition sign can be displayed.

    NG

    CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - AUTOMATIC LIGHT CONTROL SENSOR AND BODY GROUND) Click here

    OK

  2. READ VALUE USING GTS (HEADLIGHT DIMMER SWITCH)


    1. Using the GTS, read the Data List.

      Combination Switch
      Tester Display Measurement Item / Range Normal Condition Diagnostic Note
      Light Auto Switch Headlight dimmer switch signal (AUTO position) / ON or OFF

      ON: Headlight dimmer switch AUTO position

      OFF: Headlight dimmer switch OFF

      		 -
      OK
      Condition sign can be displayed.

    NG

    REPLACE MAIN BODY ECU

    OK

  3. CHECK WINDSHIELD WIPER SWITCH (OPERATION)


    1. Temporarily replace the windshield wiper switch with a new or normally functioning one Click here.

    2. Check the windshield wiper switch operation.

      OK
      Windshield wiper switch operation is normal.

    NG

    REPLACE MAIN BODY ECU

    OK

    END (REPLACE WINDSHIELD WIPER SWITCH) Click here

  4. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - AUTOMATIC LIGHT CONTROL SENSOR AND BODY GROUND)

    A01GWK2E03

    1. Disconnect the L12 ECU connector.

    2. Disconnect the M2 sensor connector.

    3. Measure the resistance according to the value(s) in the table below.

      Standard resistance
      Tester Connection Condition Specified Condition
      L12-20 (CLTB) - M2-6 (CLTB) Always Below 1 Ω
      L12-19 (CLTS) - M2-5 (CLTS) Always Below 1 Ω
      L12-18 (CLTE) - M2-3 (CLTE) Always Below 1 Ω
      L12-20 (CLTB) - Body ground Always 10 kΩ or higher
      L12-19 (CLTS) - Body ground Always 10 kΩ or higher
      L12-18 (CLTE) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. CHECK MAIN BODY ECU (CLTB VOLTAGE)

    A01H0J7E03

    1. Disconnect the L12 ECU connector.

    2. Measure the voltage according to the value(s) in the table below.

      Standard voltage
      Tester Connection Switch Condition Specified Condition
      20 (CLTB) - Body ground Power switch ON (IG) 11 to 14 V

    NG

    REPLACE MAIN BODY ECU

    OK

    REPLACE AUTOMATIC LIGHT CONTROL SENSOR Click here