DYNAMIC RADAR CRUISE CONTROL SYSTEM(for 2GR-FE, 2AR-FE) 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 assembly.

This circuit provides power to the millimeter wave radar sensor assembly. The millimeter wave radar sensor assembly 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 assembly.

WIRING DIAGRAM

A01W5QDE28
*a from IG1 NO. 4 Relay
*b ECU-IG1 NO. 3
*c Millimeter Wave Radar Sensor Assembly

CAUTION / NOTICE / HINT

Note

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

PROCEDURE


  1. CHECK MILLIMETER WAVE RADAR SENSOR ASSEMBLY (IGB VOLTAGE)


    1. A01VZZ8E03
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Millimeter Wave Radar Sensor Assembly)

      Disconnect the A74 millimeter wave radar sensor assembly 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
      A74-8 (IGB) - Body ground Engine switch on (IG) 11 to 14 V

    4. Turn the engine switch off.

    5. Reconnect the A74 millimeter wave radar sensor assembly connector.


    NG

    REPAIR OR REPLACE POWER SOURCE CIRCUIT

    OK

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


    1. Disconnect the A74 millimeter wave radar sensor assembly connector.

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

      Standard Resistance (Check for Open)
      Tester Connection Condition Specified Condition
      A74-1 (SGND) - Body ground Always Below 1 Ω

    3. Reconnect the A74 millimeter wave radar sensor assembly connector.


    OK

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

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR