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Inspection Procedure

  1. CHECK DISTANCE CONTROL ECU (IGB VOLTAGE) 
    1. Disconnect the L1 sensor connector.
    2. Measure the voltage of the wire harness side connector.

    Standard voltage 

    TESTER CONNECTION SPECIFIED CONDITION

    Tester Connection Condition Specified Condition
    L1-5 (IGB) - Body ground Ignition switch on 10 to 16 V

    NG: GO TO step   3 

    Fig 1: Identifying L1 Laser Sensor Connector
    G05279944Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: Go to next step 

  2. CHECK WIRE HARNESS (LASER SENSOR - HYBRID CONTROL ECU AND BODY GROUND) 
    1. Disconnect the L1 sensor connector.
    2. Disconnect the H29 hybrid vehicle control ECU connector.
    3. Measure the resistance of the wire harness side connectors.

    Standard resistance 

    TESTER CONNECTION SPECIFIED CONDITION

    Tester Connection Specified Condition
    H29-11 (LGND) - L1-1 (LGND) Below 1 Ω
    H29-11 (LGND) - Body ground 10 kΩ or higher
    L1-2 (SGND) - Body ground Below 1 Ω

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Fig 2: Disconnecting H29 Connector From Hybrid Vehicle Control ECU
    G05279945Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

  3. CHECK WIRE HARNESS (LASER SENSOR - DISTANCE CONTROL ECU) 
    1. Disconnect the L1 sensor connector.
    2. Disconnect the D2 ECU connector.
    3. Measure the resistance of the wire harness side connectors.

    Standard resistance 

    TESTER CONNECTION SPECIFIED CONDITION

    Tester Connection Specified Condition
    L1-5 (IGB) - D2-13 (IGB) Below 1 Ω
    D2-13 (IGB) - Body ground 10 kΩ or higher

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Fig 3: Identifying L1 And D2 ECU Connector
    G05279946Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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