Activation of the engine cooling fan integral with radiator prewiring N011 is managed by signals from engine control unit M010:- fan activation level 1 - pin 1 of N011 -, from pin 59 of connector A of M010;- fan activation level 2 - pin 4 of N011 -, from pin 10 of connector A of M010;- fan activation level 3 - pin 7 of N011 -, from pin 61 of connector A of M010;Radiator unit N011 receives a power supply (direct from the battery) via fuse F7 located in engine compartment control unit B001 (pin 5 of N011):Pin 2 of H011 is connected to earth C045.Engine coolant sensor on radiator sleeve K036 receives a reference earth and sends a temperature signal to engine control unit M010, to pins 3 and 28 of connector B respectively.Engine coolant temperature sensor on thermostat K036 receives a reference earth and sends a temperature signal to engine control unit M010, to pins 25 and 60 of connector B respectively.Linear sensor K120 receives a power supply and reference earth from pins 42 and 14 of connector B of M010 respectively and sends a pressure signal to pin 56 of connector A of M010.