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Inspection Procedure

  1. INSPECT MILLIMETER WAVE RADAR SENSOR ASSY 
    1. Disconnect the millimeter wave radar sensor connector.
    2. Measure the voltage according to the value(s) in the table below.

    Standard: 

    MILLIMETER WAVE RADAR SENSOR TERMINALS VOLTAGE SPECIFICATION

    Tester connection Condition Specified value
    M7-5 (IGB) - Body ground Ignition SW ON 10 to 14V

    NG: Go to step 

    Fig 1: Disconnecting Millimeter Wave Radar Sensor Connector
    G03003834Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

    OK: Go To Next Step. 

  2. CHECK WIRE HARNESS AND CONNECTOR 
    1. Disconnect the ECM E3 connector.
    2. Measure the resistance according to the value(s) in the table below.

    Standard: 

    MILLIMETER WAVE RADAR SENSOR TERMINALS RESISTANCE SPECIFICATION

    Tester connection Condition Specified value
    M7-1 (LGND) - E3-29 (LGND) Always Below 1 Ω
    M7-1 (LGND) - Body ground Always 10 kΩ or higher
    M7-2(SGND) - Body ground Always Below 1 Ω
    Fig 2: Disconnecting Millimeter Wave Radar Sensor Connector
    G03003835Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
    Fig 3: Disconnecting ECM E3 Connector
    G03003836Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

    NG: REPAIR OR REPLACE WIRE HARNESS OR CONNECTOR 

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

  3. CHECK WIRE HARNESS AND CONNECTOR (MILLIMETER WAVE RADAR SENSOR - DISTANCE CONTROL ECU) 
    1. Disconnect the cruise control ECU (distance control ECU) connector.
    2. Measure the resistance according to the value(s) in the table below.

    Standard: 

    MILLIMETER WAVE RADAR SENSOR AND DISTANCE CONTROL ECU TERMINALS RESISTANCE

    Tester connection Condition Specified value
    D2-13 (IGB) - M7-5 (IGB) Always Below 1 Ω
    D2-13 (IGB) - Body ground Always 10 kΩ or higher
    Fig 4: Disconnecting Millimeter Wave Radar Sensor Connector
    G03003837Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
    Fig 5: Disconnecting Cruise Control ECU (Distance Control ECU) Connector
    G03003838Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

    NG: REPAIR OR REPLACE WIRE HARNESS OR CONNECTOR 

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