The reversing lights switch in the robotized gearbox control unit M054 (pin 10 of connector A) receives an ignition-controlled power supply (15/54) from the line coming from pin 20 of connector A of the engine compartment junction unit B001. The line is protected by fuse F16 in B001 and also supplies the reversing lights in the rear light clusters from pin 4 of connector A of M054 via a connection inside the junction unit under the dashboard B002.When the gear lever is placed in position R, the switch closes and sends a power supply, from pin 7 of connector C of junction unit B002, to the reversing lights in the left F030 and right F031 light clusters to pins 3 of connector A respectively. This signal is then also acquired by the Body Computer M001 via pin 3 of the coupling with B002.The Body Computer receives a power supply from the battery, via the line protected by fuse F1 located in the engine compartment junction unit B001. It also receives an ignition-controlled power supply (INT) from the ignition switch H001. The reference earth reaches pins 10 and 19 of connector A of M001.Once the Body Computer M001 acquires the signal that reverse gear has been engaged, it is sent to the other nodes involved via the CAN.