RBS indicator light come on sometimes

•RBS system is controlled by RBS control module communicating with ESP^® control module, BCM, ECM, steering angle sensor, ENG A-STOP control module and combination meter through CAN communication. Before performing symptom diagnosis, check that no DTC is indicated in these control modules.
•With the radiator grill installed, the millimeter wave radar cover cannot be removed. It is necessary to remove the radiator grill for visual inspection of the millimeter wave radar device (RBS control module).