2010 Acura RL Owner's Manual - Page 333

Adaptive Cruise Control (ACC) Automatic ACC Cancellation When ACC is automatically canceled, the beeper sounds about 1 second, and an ACC OFF message appears on the multi-information display for 3 seconds. Any of these conditions may cause ACC to cancel: The vehicle speed decreases below 22 mph (35 km/h). Poor weather (rain, fog, snow, etc.) When the radar sensor in the front grille gets dirty. The vehicle ahead of you cannot be detected. An abnormal tire condition is detected, or the tires are skidding. Driving on a mountainous road, or driving off road for extended periods. Abrupt steering wheel movement. When the ABS or VSA is activated. When the VSA indicator comes on. If ACC is cancelled by any these conditions, wait until the condition improves, then press the RES/ ACCEL button to restore ACC. When you do this, the vehicle will resume its set cruising speed. If you turn the ignition switch to the ACCESSORY (I) or LOCK (0) position after ACC was automatically cancelled, the set speed is erased, and you must enter it again (see page 324 ). ACC Indicator ACC INDICATOR This indicator normally comes on for a few seconds when you turn the ignition switch to the ON (II) position. If it comes on at any other time, there is a problem in the ACC system. If this happens, take the vehicle to your dealer to have it checked. The ACC system cannot be used while this indicator is on. 330 2010 RL