WIRING DIAGRAM - COMPRESSOR ENGAGEMENT - Fiat 500 1.4 16v
COMPONENTS - COMPRESSOR ENGAGEMENT - Fiat 500 1.4 16v
| Component code | Description | Reference to the operation |
| A001 | BATTERY | |
| B001 | JUNCTION UNIT | |
| C015 | DASHBOARD EARTH, DRIVER'S SIDE | - |
| C039 | COMPRESSOR EARTH | - |
| D004 | FRONT/ENGINE COUPLING | - |
| D008 | AIR CONDITIONING-HEATER FRONT COUPLING | - |
| H001 | IGNITION SWITCH | |
| K120 | LINEAR SENSOR FOR FANS | |
| L020 | AIR CONDITIONING COMPRESSOR ENGAGEMENT ELECTRO-MAGNET | |
| M001 | BODY COMPUTER | |
| M010 | ENGINE MANAGEMENT ECU | |
| M070 | CLIMATE CONTROL SYSTEM CONTROL UNIT | - |
COMPONENT LOCATION - COMPRESSOR ENGAGEMENT - Fiat 500 1.4 16v
| Component code | Description | Reference to the operation |
| A001 | BATTERY | |
| B001 | JUNCTION UNIT | |
| C015 | DASHBOARD EARTH, DRIVER'S SIDE | - |
| C039 | COMPRESSOR EARTH | - |
| D004 | FRONT/ENGINE COUPLING | - |
| D008 | AIR CONDITIONING-HEATER FRONT COUPLING | - |
| H001 | IGNITION SWITCH | |
| K120 | LINEAR SENSOR FOR FANS | |
| L020 | AIR CONDITIONING COMPRESSOR ENGAGEMENT ELECTRO-MAGNET | |
| M001 | BODY COMPUTER | |
| M010 | ENGINE MANAGEMENT ECU | |
| M070 | CLIMATE CONTROL SYSTEM CONTROL UNIT | - |
DESCRIPTION - COMPRESSOR ENGAGEMENT - Fiat 500 1.4 16v
The special ice symbol button, located on the climate control system controls (automatic air conditioner), or pressing the fan speed adjustment wheel (manual air conditioner), controls the engagement of the air cooling and dehumidifying circuit, activating the air conditioning compressor.The above buttons enable the operation of the air cooling circuit, but the actual compressor activation is also dependent upon the activation of:
FUNCTIONAL DESCRIPTION - COMPRESSOR ENGAGEMENT - Fiat 500 1.4 16v
Relay T05 for engine compartment junction unit B001 controls the circuit for engaging the compressor.Relay coil T05 of B001 (pin 58 of connector B) is powered when the ignition is on (15/54), along the line protected by fuse 87 of B001.In versions with manual air conditioning the compressor engagement button, located in control unit H080, sends the compressor engagement request signal to Body Computer M001 (pin 49 of connector B) via electronic thermostat N086.However, in versions with automatic air conditioning, the air conditioning control unit M070 (pins 10 and 9 of connector A) sends this request signal via the B-CAN to Body Computer M001 (pins 57 and 58 of connector B).In both cases Body Computer M001 (pins 44 and 45 of connector B) sends the enabling signal via the C-CAN to engine management control unit M010 (pins 89 and 88 of connector A).On the basis of internal control logic, control unit M010 (pin 11 of connector A) sends the compressor engagement command, exciting relay T05 of B001 (pin 59 of connector B): in this way the air conditioning compressor engagement solenoid L020 is powered with a 12 V voltage.If linear sensor K120 signals to control unit M010 (pin 57 of connector A) that the pressure value is too high or too low, then control unit M010 excludes the engagement of the compressor.Linear sensor K120 receives a power supply and reference earth at pins 28 and 7 respectively of connector A of engine management control unit M010.
