DYNAMIC RADAR CRUISE CONTROL SYSTEM Millimeter Wave Radar Sensor Power Source Circuit

DESCRIPTION

This circuit provides power to the millimeter wave radar sensor. The millimeter wave radar sensor emits radio waves towards an object in front and measures the distance and direction of the object by receiving the wave reflections. Based on the reflections, the sensor calculates the difference in speed between the vehicle and the object in front. This data is transmitted to the distance control ECU.

WIRING DIAGRAM

A01ERNXE02

INSPECTION PROCEDURE

Note

When the distance control ECU is replaced with a new one, initialization must be performed Click here.

PROCEDURE


  1. CHECK HARNESS AND CONNECTOR (MILLIMETER WAVE RADAR SENSOR - DISTANCE CONTROL ECU)


    1. A01EMWWE01

      Disconnect the A44 millimeter wave radar sensor connector.

    2. Disconnect the E86 distance control ECU connector.

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      A44-2 (SGND) - E86-10 (SGND) Always Below 1 Ω
      A44-5 (IGB) - E86-13 (IGB)
      E86-13 (IGB) - Body ground Always 10 kΩ or higher
      A44-5 (IGB) - Body ground

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  2. CHECK DISTANCE CONTROL ECU (IGB VOLTAGE)


    1. A01EP55E01

      Disconnect the A44 millimeter wave radar sensor connector.

    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      A44-5 (IGB) - A44-2 (SGND) Engine switch on (IG) 11 to 14 V

    NG

    REPLACE DISTANCE CONTROL ECU Click here

    OK

  3. CHECK HARNESS AND CONNECTOR (MILLIMETER WAVE RADAR SENSOR - ECM AND BODY GROUND)


    1. A01EPB6E02

      Disconnect the A44 millimeter wave radar sensor connector.

    2. Disconnect the A38*1 or A53*2 ECM connector.


      • *1: for LHD

      • *2: for RHD

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      for LHD
      Tester Connection Condition Specified Condition
      A44-1 (LGND) - A38-44 (LGND) Always Below 1 Ω
      A44-1 (LGND) - Body ground Always 10 kΩ or higher
      for RHD
      Tester Connection Condition Specified Condition
      A44-1 (LGND) - A53-44 (LGND) Always Below 1 Ω
      A44-1 (LGND) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE Click here