The relay T17 for the engine compartment junction unit B1 is supplied by the line for fuse F9 for the engine compartment junction unit B1 and is energized by the line ''controlled by the ignition'' (INT/A) from fuse F31 of the underdashboard junction unit B2.The relay operates the headlamp washer pump N25 directly when the earth signal arrives from the Body Computer M1. this signal from pin 14 of connector A is sent according to the screen washer positive request signal coming from the steering column switch unit H5 pin 5 of connector A and the dipped headlamps activation enablement (pin 2 of connector I of M1).