2006 BMW X5 Owner's Manual - Page 98

98nBrake force display Flat Tire Monitor The concept The Flat Tire Monitor keeps track of the inflation pressures in the four fitted tires as you drive. The system provides an alert whenever the inflation pressure in one tire drops significantly in relation to the pressure in another tire. System limits The Flat Tire Monitor cannot indicate sudden severe tire damage caused by outside factors and does not detect a natural, even pressure drop in all four tires.< In the following situations, the system could be delayed or malfunction: > When driving on snow-covered or slippery road surfaces > In the case of performance-oriented driving: slip in the drive wheels, high lateral acceleration > False alarms and undetected loss of pressure may occur when you are driving with snow chains fitted. 530de400 The brake lamps light up in two stages, depending on how forcefully you apply the brakes. > Normal braking: The brake lamp 1 and the center brake lamp light up > Heavy braking: The brake lamps 1 and 2 light up together with the center brake lamp. The check of the tire inflation pressure is based on monitoring the relative speeds of the wheels. A flat is detected and reported on the basis of a deviation in certain speed ratios. Functional requirement To ensure reliable operation, the system should have been initialized with the correct tire inflation pressure. Online Edition for Part No. 01 41 0 159 867 - © 07/05 BMW AG