2009 Volvo XC90 Owner's Manual - Page 148

06 Starting and driving Front/rear park assist (accessory/option) NOTE Faults in the system If the yellow warning symbol illuminates and PARK ASSIST SERVICE REQUIRED is shown on the information display, this indicates that the system is not functioning properly and has been disengaged. Consult a trained and qualified Volvo service technician. Cleaning the sensors • • Front park assist is disengaged automatically when the parking brake is applied. If the vehicle is equipped with front and rear park assist, both systems will be deactivated by pressing the button. Audible signals from the park assist system The Park Assist system uses an intermittent tone that pulses faster as you come close to an object, and becomes constant when you are within approximately 1 ft (30 cm) of an object in front of or behind the vehicle. If the volume of another source from the audio system is high, this will be automatically lowered. 06 CAUTION In certain circumstances, the park assist system may give unexpected warning signals that can be caused by external sound sources that use the same ultrasound frequencies as the system. This may include such things as the horns of other vehicles, wet tires on asphalt, pneumatic brakes, motorcycle exhaust pipes, etc. This does not indicate a fault in the system. G026946 Park assist sensors If there are objects within this distance both behind and in front of the vehicle, the signal alternates between front and rear speakers. The sensors must be cleaned regularly to ensure that they work properly. Clean them with water and a suitable car washing detergent. Ice and snow covering the sensors may cause incorrect warning signals. NOTE If the sensors are obstructed by e.g., dirt, snow, or ice, this could result in false warning signals from the park assist system. 148