2010 Volvo XC60 Owner's Manual - Page 177

04 Comfort and driving pleasure Adaptive Cruise Control (ACC)* • if the radar sensor is obstructed and cannot detect other vehicles, for example in heavy rain, or if snow or other objects are obscuring the radar sensor. lanes between your vehicle and the one that the system has already detected. Small vehicles, such as motorcycles, or vehicles not driving in the center of the lane may remain undetected. In curves, the radar sensor may detect the wrong vehicle or lose a detected vehicle from view. NOTE Keep the area in front of the radar sensor clean. • if the speed of vehicles ahead is significantly different from your own speed. Fault tracing and actions If the message Radar blocked See manual is displayed, this means that the radar signals from the sensor have been obstructed and that a vehicle ahead cannot be detected. This, in turn, means that the functions of the ACC, Distance Alert, and Collision Warning System with Auto-brake will not function. The table lists possible causes for this message being displayed, and suitable actions. 04 WARNING The radar sensor has a limited field of vision. In some situations it may detect a vehicle later than expected or not detect vehicles at all. G021414 Radar sensor field of vision (gray) In certain situations, the radar sensor cannot detect vehicles at close quarters, for example a vehicle that suddenly enters the Cause The surface of the radar in the grille is dirty or obstructed in some way. Heavy rain or snow is interfering with the radar signals. Action Clean the radar surface, or remove the object causing the obstruction. No action possible. Heavy precipitation may affect the function of the radar. `` * Option/accessory, for more information, see Introduction. 177