The electronic device inside the steering column switch unit H5 and the controls on the right lever are supplied at pin 11 of connector A by the line ''controlled by the ignition'' (INT/A) of relay T12 protected by fuse F43, both housed in the underdashboard control unit B2.The electronic section of the steering column switch unit H5 which manages the rearscreen wiper function is supplied at pin 12 of connector C from the same line ''controlled by the ignition'' (INT/A) for the relay T12 protected by the fuse F52, housed in the underdashboard junction unit B2.Pin 7 of connector A and pin 9 of connector C of H5 are earthed.When the rearscreen wiper function is switched on, the steering column switch unit H5 sends the control signal to the rearscreen wiper motor N16 from pin 1 of connector B; pin 2, on the other hand, receives the earth signal coming from the motor end of travel cam which stops operation. The motor N16 is then earthed.The rearscreen washer switch on the steering column switch unit H5, when operated, sends two signals from pin 10 and 12 of connector A, which operate the windscreen washer pump N22 which sends the detergent liquid to the rear.Pin 3 of connector A receives the (positive) signal coming from the Body Computer M1 pin 1 of connector A which implements the automatic operation of the rearscreen wiper with reverse gear engaged .