3363730 - E2012 MAIN BEAM HEADLAMPS - Functional description (Xenon Gas headlamps)

Functional description

The main beam headlamps activation signal is sent to pin 33 of connector G of the Body Computer M1 from the steering column switch unit H5. The 'ignition ON' signal (INT) for the switch H1 reaches the underdashboard control unit B2 at pin 11 of connector H and from there moves on to the Body Computer M1 (pin 9 of connector F). The Body Computer M1 controls the supply to the main beam headlamps by sending an earth signal to the engine compartment control unit B1 - from pin 9 of connector A of M1 - which energizes the relay T2: this supplies the dipped headlamps F10 (left) and F11 (right). Each circuit is protected by a control unit B1 fuse: F15 for the left headlamp and F14 for the right one. The signal is sent by the headlamp internal electronic circuit, which manages activation of the relevant light and the dipped/main beam switch motor The two electronic circuits inside headlamps F10 (left) and F11 (right) are supplied - pin 9 - from the INT line protected by fuse F37 of control unit B2. Pins 12 are both control units are interconnected, while pin 10 of the control unit in headlamp F10 receives a speedometer signal from Body Computer M1 (pin 28 of connector B). The Body Computer M1 is connected to the instrument panel E50 to manage the main beam headlamps warning light.