2011 Acura RL Owner's Manual - Page 426

Collision Mitigation Braking SystemTM (CMBSTM) Do not allow anything to impact the radar sensor or the radar sensor cover. If either of these parts receives a strong impact, switch the system off by pressing the CMBS OFF button, and have your vehicle checked by a dealer. If the front grille ever needs to be repaired, consult a dealer first. If the radar sensor cover or the radar sensor ever needs to be removed, take your vehicle to a dealer. Certain conditions may cause the radar aim to be temporarily out of proper range, such as the following two examples: Your vehicle is tilted because of a heavy load in the rear or from modifications to the suspension. Do not overload your vehicle (see Carrying Cargo on page 394 ), and do not make any modifications to the suspension (see Accessories and Modifications on page 392 ). The tires are not correctly maintained. Always make sure the tire pressures are correct (see page 482 ), and that the tires are the correct size and in good condition (see Tires on page 481 ). When the CMBS is on, the radar sensor constantly scans f or vehicles directly ahead of you. This means that driving on a road with a f ew or no vehicles could cause a CHECK CMBS RADAR SENSOR message to appear on the multi-inf ormation display. This is normal and not a cause f or concern. 420