Driving and operating 139DeactivationDeactivate the system by pressingthe r button.The LED in the button will go out andPark Assist Off will be displayed in theDriver Information Center.The system is deactivatedautomatically when the vehicle isdriven above a certain speed.FaultIn the event of a fault in the system,r illuminates and a message isdisplayed in the Driver InformationCenter.If the system does not work due totemporary conditions like snowcovered sensors, r illuminates ora message is displayed in the DriverInformation Center.Vehicle messages 3 90.Advanced parking aidThe advanced parking aid systemmanoeuvres the driver into a parkingslot by giving instructions on theDriver Information Center andacoustic signals. It is the driver,however, who bears full responsibilityfor accepting the parking slotsuggested by the system and theparking manoeuvre.The system uses the sensors of theparking assist system in combinationwith two additional sensors on bothsides of the front bumper.ActivationWhen looking for a parking slot, thesystem has to be activated bypressing the ( button.The system only operates at a speedup to 30 km/h (18 mph).The maximum allowed paralleldistance between the vehicle anda row of parking cars is 1.8 m.