312001132 - E6021 COMPRESSOR ENGAGEMENT - FUNCTIONAL DESCRIPTION
FUNCTIONAL DESCRIPTION
The relay T05 for the engine compartment junction unit B001 controls the circuit for engaging the compressor.The coil for relay T05 of B001 (pin 58 of connector B) receives an ignition-controlled supply (15/54) along the line protected by fuse F87 of B001.On versions with manual air conditioning, the compressor engagement button, located in the control unit H080, sends the compressor engagement request signal to the Body Computer M001 (pin 49 of connector B) via the electronic thermostat N086.On versions with automatic air conditioning, on the other hand, the climate control system control unit M070 (pins 10 and 9 of connector A) sends the Body Computer M001 (pins 57 and 58 of connector B) this request signal via the B-CAN.In both cases the Body Computer M001 (pins 44 and 45 of connector B) sends the enablement signal, via the C-CAN, to the engine management control unit M010 (pins 64 and 40 of connector A). See E1050 CAN CONNECTION LINES On the basis of its internal control logic, the control unit M010 (pin 79 of connector A) sends the command for the effective engagement of the compressor energizing relay T05 of B001 (pin 59 of connector B): in this way the air conditioning compressor engagment solenoid L020 is operated with a 12 V voltage.If the linear sensor K120 signal to the control unit M010 (pin 87 of connector A) that the pressure value is too high or too low, then the control unit M010 excludes the engagement of the compressor.
The linear sensor K120 receives a power supply and reference earth at pins 37 and 10 respectively of connector A of the engine management control unit M010.