Patent ID: 7840321

Claim:
A diagnostic system for a motor vehicle, the system comprising: a plurality of control devices arranged in the motor vehicle, said control devices communicating by way of one or more databuses of the motor vehicle; at least two diagnostics access points by way of which a state of at least one of the plurality of control devices is diagnosed as a function of a diagnostics request message, wherein an error memory entry of the at least one control device is requested through one of the at least two diagnostics access points for transmission outside of the motor vehicle; an identification and forwarding system associated with a control device, wherein the diagnostics request message fed to the system via the one diagnostics access point is recognized as a diagnostics request message by the identification and forwarding system; and a checking system associate with another one of the control devices, wherein the identification and forwarding system transmits a recognized diagnostics request message to the checking system, which checking system checks at least for authenticity of the diagnostics request message prior to forwarding the diagnostics request message to an intended control device.