The steering column switch unit windscreen wiper remote control switch H05 makes it possible to select the various windscreen wash/wipe operating modes.The power supply for the steering column switch unit H05 reaches pin 11 of connector A via the output at pin 10 connector A of the junction unit under the dashboard B02.Inside the junction unit B02 this line comes from relay F12 via a line protected by fuse F43.The power supply at the relay arrives from the line protected by fuse F1 housed in the junction unit B01 from pin A connector C of the junction unit under the dashboard B02.The operation of the relay F12 is determined by the ignition controlled supply line (INT/A) entering the junction unit under the dashboard B02 at pin 1 connector E.According to the function selected, stalk unit H05 (connector A) sends the following control signals to the electronic device inside wiper motor N15:- from pin 9 for operation at first speed;- from pin 8 for operation at second speed;- from pin 6 for zeroing.The steering column switch unit H05 also supplies the wind/rearscreen washer pump N22 sending a supply signal and an earth signal from pins 12 and 10 connector A.The steering column switch unit H05 is earthed at pin 7 connector A and at pin 5 connector C.The windscreen wiper motor N15 is earthed at pin 5.