The supply for the switchI30is controlled by the ignition (INT) from the line for fuse F37 of the underdashboard control unitB2: when the brake pedal is pressed, the switch closes and sends the ''N.A.'' signal to the Body ComputerM1, pin 2 of connector F.The ''ignition ON'' signal (INT) for the switch H1 reaches the underdashboard control unitB2at pin 11 of connector H and from there moves on to the Body ComputerM1(pin 9 of connector F).The Body ComputerM1 controls the supply for the brake lights in the light clusters F30 (left) F31A (right) from pins 32 and 33 of connector E.The Body ComputerM1is connected, via the CAN line, to the instrument panelE50to manage the ''lights failure'' warning light if there is a failure in the circuit.The switch I30 directly controls the centre rear light cluster F40 via the underdashboard control unit B2, pin 5 of connector D