106 Driving and operatingRide control systemsTraction Control systemThe Anti-Slip Regulator (ASR) is acomponent of the Electronic StabilityControl system.ASR improves driving stability whennecessary, regardless of the type ofroad surface or tyre grip, bypreventing the drive wheels fromspinning.As soon as the drive wheels starts tospin, engine output is reduced andthe wheel spinning the most is brakedindividually. This considerablyimproves the driving stability of thevehicle on slippery road surfaces.ASR is operational as soon as thecontrol indicator x extinguishes.When ASR is active x flashes.9 WarningDo not let this special safetyfeature tempt you into taking riskswhen driving.Adapt speed to the roadconditions.DeactivationASR can be switched off whenspinning of drive wheels is required:press button ASR OFF briefly.LED in button illuminates and amessage appears in the driverinformation centre.ASR is reactivated by pressing theASR OFF button again.ASR is also reactivated the next timethe ignition is switched on.FaultASR will switch off automatically inthe event of a fault. Control indicatorx will illuminate in the instrumentcluster in conjunction with a messagein the Driver Information Centre (DIC)3 73. Seek the assistance of aworkshop.Control indicator x 3 70.Electronic stabilityprogramElectronic Stability Program (ESP)improves driving stability whennecessary, regardless of the type ofroad surface or tyre grip. It alsoprevents the drive wheels fromspinning.As soon as the vehicle starts toswerve (understeer/oversteer),engine output is reduced and thewheels are braked individually. This
