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Inspection Procedure

NOTE:
  • When the distance control ECU is replaced with a new one, initialization must be performed (see INSTALLATION  ).
  • When the millimeter wave radar sensor is replaced with a new one, adjustment of the radar sensor beam axis must be performed (see INSTALLATION  ).
  1. CHECK HARNESS AND CONNECTOR (DISTANCE CONTROL ECU - MILLIMETER WAVE RADAR SENSOR) 
    1. Disconnect the distance control ECU and millimeter wave radar sensor connectors.
    2. Measure the resistance according to the value(s) in the table below.

      Standard resistance 

      RESISTANCE SPECIFICATION CHART

      Tester Connection Condition Specified Condition
      J17-23 (LRRD) - B9-4 (LRRD) Always Below 1 Ω
      J17-13 (IGB) - B9-5 (IGB) Always Below 1 Ω
      J17-23 (LRRD) - Body ground Always 10 kΩ or higher
      J17-13 (IGB) - Body ground Always 10 kΩ or higher
      3. Fig 1: Identifying Distance Control ECU Connector J17 And Millimeter Wave Radar Sensor Connectors B9
      G05831967Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to Next Step 

  2. CHECK DISTANCE CONTROL ECU 
    1. Measure the voltage according to the value(s) in the table below.

      Standard voltage 

      VOLTAGE SPECIFICATION CHART

      Tester Connection Condition Specified Condition
      J17-13 (IGB) - Body ground Engine switch on (IG) 10 to 14 V
      2. Fig 2: Identifying Distance Control ECU Connector A8
      G05831968Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPLACE DISTANCE CONTROL ECU 

    OK: Go to Next Step 

  3. CHECK MILLIMETER WAVE RADAR SENSOR 
    1. Measure the voltage according to the value(s) in the table below.

      Standard voltage 

      VOLTAGE SPECIFICATION CHART

      Tester Connection Condition Specified Condition
      B9-5 (IGB) - Body ground Engine switch on (IG) 10 to 14 V
      Fig 3: Identifying Millimeter Wave Radar Sensor B9
      G05831969Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Check the signal waveform between terminal LRRD (B9-4) of the millimeter wave radar sensor and body ground.

      OK: A waveform similar to that in the illustration on the left is output. 

      HINT:

      • Gauge set: 2 V/DIV., 5 msec./DIV.
      • Condition: Engine switch on (IG)
      3. Fig 4: Identifying Signal Waveform
      G05252185Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPLACE MILLIMETER WAVE RADAR SENSOR 

    OK: END (INTERMITTENT PROBLEM IS PRESENT) 

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