The operation of the rearscreen wash/wipe is determined by the special switch on the steering column switch unit H05 and by the supply controlled by the ignition coming from the ignition switch H01 (INT/A).The supply at the steering column switch unit H05 reaches pin 2 of connector C via the outlet at pin 17 connector G of the junction unit under the dashboard B02 .Inside the junction unit B02 , this line arrives from the relay R12 via a line protected by fuse F52 . The 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 R12 is determined by the supply line controlled by the ignition (INT/A) entering the junction unit under the dashboard B02 at pin 1 connector E.The steering column switch unit H05 controls the rearscreen wiper motor N16 via two lines (pins 4 and 3 of connector C) going from the junction unit under the dashboard B02 (input: pins 15 and 11 connector G, output: pins 9 and 20 connector D).The steering column switch unit H05 also controls the windscreen/rearscreen washer pump N22 via pins 12 and 10 connector A of the steering column switch unit 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 of connector C.