The CODE unit inside Body Computer M1 - connector G - is supplied directly from the battery from a line protected by maxifuse F2 of engine compartment control unit B1. It is ignition-operated (INT) at pin 32 of connector D. Pin 10 of connector H of M1 supplies a reference earth to the Body Computer.The CODE aerial P91 is connected by means of two cables to the CODE unit M1, at pins 1 and 16 of connector A; the aerial is positioned coaxially on the ignition switch in order to detect the key being inserted and turned.The key recognition communication and exchange of codes between Body Computer M1 and engine control unit M10 takes place via the C-CAN network.The Body Computer M1 is connected via the CAN line to the instrument panel E50 to manage the "CODE failure" warning light.