Two signals (earth) are sent from the steering wheel stalk unit H5 to the Body Computer M1 that manages both side lights and low beams in manual or AUTO mode (automatic dusk sensor activation).The "Light 1" signal is sent from pin 28 of connector G of Body Computer M1 from stalk unit H5, pin 7 of connector C.The "Light 2" signal is sent from pin 2 of connector I of Body Computer M1 from stalk unit H5, pin 8 of connector C.The dipped headlamps are activated in manual mode when the Light 1 signal is not present and the Light 2 signal is not present either.The dipped headlamps are activated in AUTO mode when the Light 1 signal is not present and the Light 2 signal is not present.If both signals are present, the lights are permanently off.The dipped headlamps are automatically activated by the dusk sensor K125 (signal via the A-BUS line at pin 7 of connector D of M1); the dusk sensor K125 receives a supply from the INT line protected by fuse F49 of junction unit B2.The Body Computer M1 controls the supply for the dipped headlamps sending an earth signal to the junction unit under the dashboard B2 from pin 8 of connector F of M1 which energizes relay T1: this supplies the dipped headlamps F10 (left) and F11 (right). Each circuit is protected by a fuse for the junction unit B2F13 protects the left headalmp and F12 protects the right.