Patent ID: 7451026

Claim:
A control unit for controlling and/or regulating at least one vehicle function, comprising: at least one computing element and one transceiver that connect the control unit to at least one data line of a client-server network, the at least one computing element configured to determine if the transceiver is transmitting or receiving data via the at least one data line of the client-server network using at least one transmitted signal and at least one received signal; and at least one measurement device, the control unit being connected to the at least one data line of the client-server network via the at least one measurement device, the measurement device including a detector configured to determine if a change in a state of a data signal applied to the at least one data line originates at the control unit or at the client-server network; wherein the measurement device includes two resistor elements connected in series, one of the resistor elements being connected to the transceiver of the control unit and the other resistor element being connected to the data line of the client-server network, a reference signal being applied between the two resistor elements, and wherein the detector further includes a measurement arrangement configured to measure a voltage drop across each of the resistor elements, and wherein the detector includes a comparator to compare the two measured voltage drops to each other, the detector determining if the change in the state of the data signal applied to the at least one data line originates at the control unit or at the rest of the client-server network based on a result of the comparison.