The activation of the compressor L021 takes place via relay T05 located in the engine compartment junction unit B001. The relay coil receives a power supply from relay T09 also located in the engine compartment junction unit. Both relays are controlled by the engine management control unit M010, from pin 79 and pin 80 respectively of connector B of M010.Following the activation control from T05, the compressor L021 receives a power supply from the battery via the line protected by fuse F19.The activation command comes from the dedicated button in the climate control system control unit H080. The signal leaves pin 2 of connector B of H080 and reaches pin 28 of connector B of M010.The climate control system control unit H080 receives an ignition-controlled supply (INT) at pin 1 of connector B via the line protected by fuse F51 located in the junction unit under the dashboard B002. The reference earth is received by H080 at pin 1 of connector A.With the compressor enabled and engine started, fan N085 is operated at the first speed. The fan N085 receives a power supply directly from the battery along the line protected by fuse F8 and operated by relay T08 in the engine compartment junction unit B001. The coil for relay T08 receives a power supply from the ignition-controlled line excluded during starting (INT/A); this line is protected by fuse F31 in the junction unit under the dashboard B002. See E6020 AIR CONDITIONING When managing the function the engine management control unit acquires information relating to the pressure of the refrigerant fluid from the linear sensor K120.Linear sensor K120 receives a power supply from pin 37 of connector B of M010 and the control unit provides a reference earth for K120 via the line leaving pin 10 of connector B of M010 that reaches pin 1 of K120.The sensor K120 and the control unit exchange information via the signal that leaves pin 3 of K120 and reaches pin 87 of connector B of M010.