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Step Illumination Circuit: Procedure

  1. CHECK OPERATION OF FOOT LIGHT AND ILLUMINATION LIGHT 
    1. When a door is opened, check that the appropriate light illuminates.

      Result

      Result Proceed to
      All lights do not illuminate A
      Foot light (LH) does not illuminate B
      Foot light (RH) does not illuminate C
      Foot light (rear LH or rear LH No. 2) does not illuminate D
      Foot light (rear RH or rear RH No. 2) does not illuminate E

    E → See step   13 

    D → See step   10 

    C → See step   7 

    B → See step   4 

    A: Go to next step 

  2. PERFORM ACTIVE TEST USING TECHSTREAM 
    1. Select the ACTIVE TEST, use the Techstream to generate a control command, and then check that the step light illuminates.
      BODY (MULTIPLEX NETWORK BODY ECU)

      Item Test Details Diagnostic Note
      Step Light Step light ON / OFF -

      OK

      Step light illuminates.

    NG → See step   3 

    OK → PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE 

  3. INSPECT FUSE (DOME, D/C CUT) 
    1. Remove the DOME fuse from the engine room No. 1 relay block.
    2. Remove the D/C CUT fuse from the engine room No. 1 relay block.
    3. Measure the resistance of the fuses.

      Standard resistance

      Below 1 Ω

    NG → REPLACE FUSE 

    OK → PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE 

  4. REPLACE FOOT LIGHT (LH) 
    1. Temporarily replace the foot light (LH) with a new or normally functioning one.
    2. Check that the foot light illuminates.

      OK

      Foot light illuminates.

    OK → END 

    NG: Go to next step 

  5. CHECK WIRE HARNESS (FOOT LIGHT (LH) - BATTERY) 
    1. Disconnect the K17 light connector.
      Fig 1: Identifying K17 Light Connector
      GTY100071Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the voltage of the wire harness side connector.

      Standard voltage

      Tester Connection Specified Condition
      K17-2 - Body ground 10 to 14 V

    NG → REPAIR OR REPLACE HARNESS AND CONNECTOR 

    OK: Go to next step 

  6. CHECK WIRE HARNESS (FOOT LIGHT (LH) - MULTIPLEX NETWORK BODY ECU) 
    1. Disconnect the K17 light connector.
      Fig 2: Identifying K17 Light Connector And K68 ECU Connector
      GTY104007Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Disconnect the K68 ECU connector.
    3. Measure the resistance of the wire harness side connectors.

      Standard resistance

      Tester Connection Specified Condition
      K17-1 - K68-15 (FSPT) Below 1 Ω
      K17-1 or K68-15 (FSPT) - Body ground 10 kΩ or higher

    NG → REPAIR OR REPLACE HARNESS AND CONNECTOR 

    OK → PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE 

  7. REPLACE FOOT LIGHT (RH) 
    1. Temporarily replace the foot light (RH) with a new or normally functioning one.
    2. Check that the foot light illuminates.

      OK

      Foot light illuminates.

    OK → END 

    NG: Go to next step 

  8. CHECK WIRE HARNESS (FOOT LIGHT (RH) - BATTERY) 
    1. Disconnect the K49 light connector.
      Fig 3: Identifying K49 Light Connector
      GTY100072Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the voltage of the wire harness side connector.

      Standard voltage

      Tester Connection Specified Condition
      K49-2 - Body ground 10 to 14 V

    NG → REPAIR OR REPLACE HARNESS AND CONNECTOR 

    OK: Go to next step 

  9. CHECK WIRE HARNESS (FOOT LIGHT (RH) - MULTIPLEX NETWORK BODY ECU) 
    1. Disconnect the K49 light connector.
      Fig 4: Identifying K49 Light Connector And K68 ECU Connector
      GTY108247Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Disconnect the K68 ECU connector.
    3. Measure the resistance of the wire harness side connectors.

      Standard resistance

      Tester Connection Specified Condition
      K49-1 - K68-15 (FSPT) Below 1 Ω
      K49-1 or K68-15 (FSPT) - Body ground 10 kΩ or higher

    NG → REPAIR OR REPLACE HARNESS AND CONNECTOR 

    OK → PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE 

  10. REPLACE INTERIOR ILLUMINATION LIGHT (FRONT LH SEAT) 
    1. Temporarily replace the illumination light (front LH seat) with a new or normally functioning one.
    2. Check that the illumination light illuminates.

      OK

      Illumination light illuminates.

    OK → END 

    NG: Go to next step 

  11. CHECK WIRE HARNESS (INTERIOR ILLUMINATION LIGHT (REAR LH SEAT) - BATTERY) 
    1. for Rear LH
      1. Disconnect the b12 light connector.
        Fig 5: Identifying B12 Light Connector
        GTY108245Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      2. Measure the voltage of the wire harness side connector.

        Standard voltage

        Tester Connection Specified Condition
        b12-2 - Body ground 10 to 14 V
    2. for Rear LH No. 2
      1. Disconnect the b17 light connector.
        Fig 6: Identifying B17 Light Connector Terminal
        GTY100418Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      2. Measure the voltage of the wire harness side connector.

        Standard voltage

        Tester Connection Specified Condition
        b17-2 - Body ground 10 to 14 V

    NG → REPAIR OR REPLACE HARNESS AND CONNECTOR 

    OK: Go to next step 

  12. CHECK WIRE HARNESS (INTERIOR ILLUMINATION LIGHT (REAR LH SEAT) - MULTIPLEX NETWORK BODY ECU) 
    1. for Rear LH
      1. Disconnect the b12 light connector.
        Fig 7: Identifying B12 Light Connector And K68 ECU Connector
        GTY108248Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      2. Disconnect the K68 ECU connector.
      3. Measure the resistance of the wire harness side connectors.

        Standard resistance

        Tester Connection Specified Condition
        b12-1 - K68-15 (FSPT) Below 1 Ω
        b12-1 or K68-15 (FSPT) - Body ground 10 kΩ or higher
    2. for Rear LH No. 2
      1. Disconnect the b17 light connector.
        Fig 8: Identifying K68 ECU Connector Terminal
        GTY104005Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      2. Disconnect the K68 ECU connector.
      3. Measure the resistance of the wire harness side connectors.

        Standard resistance

        Tester Connection Specified Condition
        b17-1 - K68-15 (FSPT) Below 1 Ω
        b17-1 or K68-15 (FSPT) - Body ground 10 kΩ or higher

    NG → REPAIR OR REPLACE HARNESS AND CONNECTOR 

    OK → PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE 

  13. REPLACE INTERIOR ILLUMINATION LIGHT (FRONT RH SEAT) 
    1. Temporarily replace the illumination light (front RH seat) with a new or normally functioning one.
    2. Check that the illumination light illuminates.

      OK

      Illumination light illuminates.

    OK → END 

    NG: Go to next step 

  14. CHECK WIRE HARNESS (INTERIOR ILLUMINATION LIGHT (REAR RH SEAT) - BATTERY) 
    1. for Rear RH
      1. Disconnect the a12 light connector.
        Fig 9: Identifying A12 Light Connector
        GTY108246Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      2. Measure the voltage of the wire harness side connector.

        Standard voltage

        Tester Connection Specified Condition
        a12-2 - Body ground 10 to 14 V
    2. for Rear RH No. 2
      1. Disconnect the a21 light connector.
        Fig 10: Identifying a21 Light Connector
        GTY100420Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      2. Measure the voltage of the wire harness side connector.

        Standard voltage

        Tester Connection Specified Condition
        a21-2 - Body ground 10 to 14 V

    NG → REPAIR OR REPLACE HARNESS AND CONNECTOR 

    OK: Go to next step 

  15. CHECK WIRE HARNESS (INTERIOR ILLUMINATION LIGHT (REAR RH SEAT) - MULTIPLEX NETWORK BODY ECU) 
    1. for Rear RH
      1. Disconnect the a12 light connector.
        Fig 11: Identifying A12 Light & K68 ECU Connector Terminals
        GTY104004Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      2. Disconnect the K68 ECU connector.
      3. Measure the resistance of the wire harness side connectors.

        Standard resistance

        Tester Connection Specified Condition
        a12-1 - K68-15 (FSPT) Below 1 Ω
        a12-1 or K68-15 (FSPT) - Body ground 10 kΩ or higher
    2. for Rear RH No. 2
      1. Disconnect the a21 light connector.
        Fig 12: Identifying A21 light Connector Terminal
        GTY101507Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      2. Disconnect the K68 ECU connector.
      3. Measure the resistance of the wire harness side connectors.

        Standard resistance

        Tester Connection Specified Condition
        a21-1 - K68-15 (FSPT) Below 1 Ω
        a21-1 or K68-15 (FSPT) - Body ground 10 kΩ or higher

    NG → REPAIR OR REPLACE HARNESS AND CONNECTOR 

    OK → PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE 

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