The activation signal for the brake lights leaves the N.A. contact of switch I30 whose supply is controlled by the ignition via the connection between the ignition switch H01 and pin 11 connector E of the junction unit under the dashboard B02. The line is protected by fuse F37 housed in the same junction unit ( B02 ).When the brake pedal I30 is pressed the N.A. contact for the switch closes and the centre rear light F40 is supplied via pin 5 connector D of the junction unit under the dashboard B02. At the same time, a signal is sent to the body computer M01 which lights up the third brake lights in the rear lights F30 and F31 from pins 32 and 22 of connector A, respectively.The body computer can be supplied via pin 11 connector E (supply controlled by the ignition) and pin A connector C (direct supply) of the junction unit B02 . There is a protective fuse F1 for the direct supply located in the junction unit B01 .Pins 8 and 9 connector D of the body computer are connected to earth.