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

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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 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 distance control ECU (cruise control ECU).

WIRING DIAGRAM


E109728E01


INSPECTION PROCEDURE

1.CHECK DISTANCE CONTROL ECU (IGB VOLTAGE)
I044453E02

  1. Disconnect the B8 sensor connector.

  1. Measure the voltage of the wire harness side connector.

    Standard voltage:
    Tester Connection
    		Condition
    		Specified Condition
    B8-5 (IGB) - Body ground
    		Engine switch on (IG)
    		10 to 16 V



NG
Go to step 3
OK


2.CHECK WIRE HARNESS (MILLIMETER WAVE RADAR SENSOR - ECM AND BODY GROUND)
I044455E02

  1. Disconnect the B8 sensor connector.

  1. Disconnect the A6 ECM connector.

  1. Measure the resistance of the wire harness side connectors.

    Standard resistance:
    Tester Connection
    		Specified Condition
    A6-29 (LGND) - B8-1 (LGND)
    		Below 1 Ω
    B8-1 (LGND) - Body ground
    		10 kΩ or higher
    B8-2 (SGND) - Body ground
    		Below 1 Ω



NG
REPAIR OR REPLACE WIRE HARNESS AND CONNECTOR
OK

PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE 

3.CHECK WIRE HARNESS (MILLIMETER WAVE RADAR SENSOR - DISTANCE CONTROL ECU)
I044456E03

  1. Disconnect the B8 sensor connector.

  1. Disconnect the L13 ECU connector.

  1. Measure the resistance of the wire harness side connectors.

    Standard resistance:
    Tester Connection
    		Specified Condition
    B8-5 (IGB) - L13-13 (IGB)
    		Below 1 Ω
    L13-13 (IGB) - Body ground
    		10 kΩ or higher



NG
REPAIR OR REPLACE WIRE HARNESS AND CONNECTOR
OK

PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE