The supply for the switch I30 is controlled by the ignition (INT) from the line for fuse F37 of the underdashboard control unit B2 : when the brake pedal is pressed, the switch closes and sends the ''N.A.'' signal to the Body Computer M1 , pin 2 of connector F.The Body Computer M1 controls the supply for the brake lights in the light clusters F30 (left) F31 (right) from pins 32 and 33 of connector E.The Body Computer M1 is connected, via the CAN line, to the instrument panel E50 to manage the failure warning light or the fuse if there is a failure in the circuit.The switch I30 directly controls the centre brake light F40 via the underdashboard control unit B2, pin 5 of connector D with no control logic.