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

DESCRIPTION

When the engine switch is turned on (IG), battery voltage is applied to terminal IGB of the millimeter wave radar sensor.

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 beam 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 driving support ECU.

WIRING DIAGRAM

A019KZ3E03

INSPECTION PROCEDURE

Note

Inspect the fuses for circuits related to this system before performing the following inspection procedure.

PROCEDURE


  1. CHECK MILLIMETER WAVE RADAR SENSOR (IGB VOLTAGE)

    A019KOVE57
    Text in Illustration
    *1

    Front view of wire harness connector

    (to Millimeter Wave Radar Sensor)

    1. Disconnect the millimeter wave radar sensor connector.

    2. Turn the engine switch on (IG).

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      B1-5 (IGB) - Body ground Engine switch on (IG) 11 to 14 V

    4. Turn the engine switch off.

    5. Reconnect the millimeter wave radar sensor connector.


    NG

    REPAIR OR REPLACE POWER SOURCE CIRCUIT

    OK

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


    1. Disconnect the millimeter wave radar sensor connector.

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

      Standard Resistance (Check for Open)
      Tester Connection Condition Specified Condition
      B1-2 (SGND) - Body ground Always Below 1 Ω

    3. Reconnect the millimeter wave radar sensor connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Click here