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Millimeter Wave Radar Sensor Power Source Circuit: Wiring Diagram

Fig 1: Identifying Millimeter Wave Radar Sensor Power Source Wiring Diagram
G04049272Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  1. CHECK DISTANCE CONTROL ECU (IGB VOLTAGE) 
    1. Disconnect the B9 sensor connector.
    2. Measure the voltage according to the value(s) in the table below.

    Standard voltage 

    TESTER CONNECTION AND SPECIFIED CONDITION CHART

    Tester Connection Condition Specified Condition
    B9-5 (IGB) - Body ground Engine switch on (IG) 10 to 14 V
    Fig 2: Checking Distance Control ECU (IGB Voltage)
    G04049273Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG : Go to step  3

    OK : Go To Next Step 

  2. CHECK WIRE HARNESS (MILLIMETER WAVE RADAR SENSOR - ECM AND BODY GROUND) 
    1. Disconnect the B9 sensor connector.
    2. Disconnect the A5 ECM connector.
    3. Measure the resistance according to the value(s) in the table below.

    Standard resistance 

    TESTER CONNECTION AND SPECIFIED CONDITION CHART

    Tester Connection Specified Condition
    A5-9 (LGND) - B9-1 (LGND) Below 1Ω
    B9-1 (LGND) - Body ground 10 kΩ or higher
    B9-2 (SGND) - Body ground Below 1Ω
    Fig 3: Checking Wire Harness (Millimeter Wave Radar Sensor - ECM And Body Ground)
    G04049274Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG : REPAIR OR REPLACE HARNESS OR CONNECTOR 

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

  3. CHECK WIRE HARNESS (MILLIMETER WAVE RADAR SENSOR - DISTANCE CONTROL ECU) 
    1. Disconnect the B9 sensor connector.
    2. Disconnect the J17 ECU connector.
    3. Measure the resistance according to the value(s) in the table below

    Standard resistance 

    TESTER CONNECTION AND SPECIFIED CONDITION CHART

    Tester Connection Specified Condition
    B9-5 (IGB) - J17-13 (IGB) Below 1Ω
    J17-13 (IGB) - Body ground 10 kΩ or higher

    NG : REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Fig 4: Checking Wire Harness (Millimeter Wave Radar Sensor - Distance Control ECU)
    G04049275Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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