Millimeter Wave Radar Sensor Power Source Circuit [08/2013 - ]: Description

This circuit provides power to the millimeter wave radar sensor assembly. The millimeter wave radar sensor assembly emits radio waves toward 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. The ECU recognizes the millimeter wave radar sensor assembly via terminals LGND. If an open circuit occurs in the wire harness between terminals LGND, the ECM cannot recognize the millimeter wave radar sensor assembly. The ECM will prohibit vehicle-to-vehicle distance control mode and only the constant speed control mode can be used.