prevention of unauthorized hyttippningsmanu00f6vreringar

摘要

The present invention relates to tilting of a driver's cab (130) relative to a frame of a motor vehicle, so as to provide physical access to at least one vital part (140, 160) located under the cab (130). In response to an inserted key means (170), a key verification means (155) in the vehicle generates a first data message (EC) representing an encrypted challenge. The key means (170), in turn, produces a second data message representing an encrypted response (ER(ID key )) in response to the first data message (EC). The key verification means (155) tests an acceptance criterion based on the encrypted response (ER(ID key )). If the acceptance criterion is fulfilled, the key verification means (155) transmits a permit signal (OK tilt ) to a tilt control means (160). The permit signal (OK tilt ) finally enables the tilt control means (160) to generate a first control signal (C tilt ) for accomplishing the tilting of the cab (130), for instance by means of an hydraulic mechanism.