*RPAS is an electronic driving aid device warning driver to be cautious when they park or speed low after detecting an object on side and behind of vehicle by using the feature of ultrasonic waves.

RPAS consists of four RPAS sensors which are detecting the obstacles and transmit the result separated into three warning levels, the first, second and third to BCM by LIN communication.

BCM decides the alarm level by the transmitted communication message from the slave sensors, then operate the buzzer or transmits the data for display.