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IntroductionModern motor vehicles are characterised by amultitude of electrical and electronic systems, whichregulate the vehicle's operation, increase vehiclesafety and driving comfort and support the driver indriving the vehicle.Interaction between these systems can only functionif they respond to each other. For example, the ABSand ESP control unit must be able to instruct theengine control unit to reduce the engine's output if thisis made necessary by a corresponding drivingsituation. Today, this information is extensivelyexchanged in digital form via fast data bus systems.As a result of this high technical standard, it isbecoming increasingly important to update thevehicle systems' software via on-line workshop linksand to ensure that this is kept up-to-date.In view of this, the Eos, the most recent developmentin the convertible range, also reveals a multitude ofvehicle systems which exchange information,as part of controlling the convertible roof, to ensuresafe and flawless convertible roof operation. In theEos, the new immobilizer IV is one of those systemswhich requires an on-line workshop link to downloaddata to adapt the system.S379_0284