The relay T17 for the engine compartment control unitB1is supplied by the line for fuse F9 for the engine compartment control unitB1and is energized by the line ''controlled by the ignition'' (INT/A) from fuse 31 of the underdashboard control unitB2.The relay operates the headlamp washer pumpN25directly when the command arrives from the Body ComputerM1.The Body Computer, in turn, processes the signal, at pin 14 of connector A, coming from the steering column switch unitH5 and the go ahead with the main beam or dipped headlamps on.