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 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

INSPECTION PROCEDURE

PROCEDURE

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

   
   
   1. 

      Text in Illustration

      *a	Front view of wire harness connector (to Millimeter Wave Radar Sensor Assembly)

      Disconnect the A85 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 A85-5 (IGB) - Body ground Engine switch on (IG) 11 to 14 V

   4. Turn the engine switch off.

   5. Reconnect the A85 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 A85 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 A85-1 (SGND) - Body ground Always Below 1 Ω

   3. Reconnect the A85 millimeter wave radar sensor assembly connector.

   
   

   NG

   REPAIR OR REPLACE HARNESS OR CONNECTOR

   OK

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