2011 Acura RL Owner's Manual - Page 425

Collision Mitigation Braking SystemTM (CMBSTM) Radar Sensor Always keep the radar sensor cover clean. If it gets dirty, clean it with water or a mild detergent. Never use chemical solvents or polishing powder. BOLTS (Do not tamper) Driving RADAR SENSOR COVER The radar sensor is located under the Acura emblem in the front grille. If the radar sensor cover is covered with mud, dirt, dead leaves, wet snow, etc., or if you put a sticker on it, the CMBS will automatically shut off, and the CMBS indicator on the instrument panel will come on. You will also see a ''CHECK CMBS RADAR SENSOR'' message on the multi-information display for about 5 seconds. There are three bolts on the sides of the radar sensor. Do not tamper with these bolts, or you may cause the system to malfunction. CONTINUED 419