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Mercedes C class W204 engine does not start after turning the key in the ignition. A film describing detailed diagnostics of the engine starting system. This is an excellent example of how complicated car diagnostics can be. Guessing and replacing random parts does not lead to anything good, especially in the case of modern cars. Knowledge of how car networks work is the basis for diagnostics based on digital data exchange. Registration for the training is available at: https://autonomis.pl/sklep 00:00 Introduction 1:22 Checking the starter relay circuit 7:18 Analysis of fault codes and actual values 17:17 Engine controller wiring diagram 20:08 Checking the continuity of the starter relay control cable 26:44 Network connection of components and further diagnostic strategy 32:15 Connecting the oscilloscope to the CAN network 33:56 Analysis of the CAN drive network signal 43:44 Key test confirming the cause of the fault. 47:21 Third party interference in the ignition switch 52:36 CAN network signal analysis after repair 53:57 Summary