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Wiring Diagram - COMPRESSOR ENGAGEMENT - Fiat DUCATO 2.3 JTD 16V da 03/05
Components - COMPRESSOR ENGAGEMENT - Fiat DUCATO 2.3 JTD 16V da 03/05
| Component code | Description | Reference to the assembly |
| B001 | JUNCTION UNIT | 5505A |
| B002 | JUNCTION UNIT UNDER DASHBOARD | - |
| B099 | MAXI FUSE BOX ON BATTERY | - |
| B101 | OPTIONAL JUNCTION UNIT UNDER THE DASHBOARD | - |
| C010 | LEFT FRONT EARTH | - |
| C016 | AIR CONDITIONING UNIT EARTH | - |
| D004 | FRONT/ENGINE COUPLING | - |
| D018 | ADDITIONAL FRONT/DASHBOARD COUPLING | - |
| D021 | DASHBOARD/AIR CONDITIONING-HEATER COUPLING | - |
| D097 | SHORT CIRCUITING COUPLING | - |
| D160 | DASHBOARD/OPTIONAL DASHBOARD COUPLING | - |
| D161 | OPTIONAL DASHBOARD/AIR CONDITIONING COUPLING | - |
| D180 | AIR CONDITIONING/ADDITIONAL AIR CONDITIONING COUPLING | - |
| H001 | IGNITION SWITCH | |
| J020 | AIR CONDITIONING COMPRESSOR ENGAGEMENT RELAY | - |
| J021 | COMPRESSOR ENGAGEMENT ADDITIONAL REMOTE CONTROL SWITCH | - |
| K010 | 4 STAGE PRESSURE SWITCH | |
| K086 | FROST SENSOR | - |
| L020 | AIR CONDITIONING COMPRESSOR ENGAGEMENT ELECTRO-MAGNET | - |
| M010 | ENGINE MANAGEMENT ECU | - |
| M070 | CLIMATE CONTROL SYSTEM CONTROL UNIT | - |
Component location - COMPRESSOR ENGAGEMENT - Fiat DUCATO 2.3 JTD 16V da 03/05
| Component code | Description | Reference to the assembly |
| B001 | JUNCTION UNIT | 5505A |
| B002 | JUNCTION UNIT UNDER DASHBOARD | - |
| B099 | MAXI FUSE BOX ON BATTERY | - |
| B101 | OPTIONAL JUNCTION UNIT UNDER THE DASHBOARD | - |
| C010 | LEFT FRONT EARTH | - |
| C016 | AIR CONDITIONING UNIT EARTH | - |
| D004 | FRONT/ENGINE COUPLING | - |
| D018 | ADDITIONAL FRONT/DASHBOARD COUPLING | - |
| D021 | DASHBOARD/AIR CONDITIONING-HEATER COUPLING | - |
| D097 | SHORT CIRCUITING COUPLING | - |
| D160 | DASHBOARD/OPTIONAL DASHBOARD COUPLING | - |
| D161 | OPTIONAL DASHBOARD/AIR CONDITIONING COUPLING | - |
| D180 | AIR CONDITIONING/ADDITIONAL AIR CONDITIONING COUPLING | - |
| H001 | IGNITION SWITCH | |
| J020 | AIR CONDITIONING COMPRESSOR ENGAGEMENT RELAY | - |
| J021 | COMPRESSOR ENGAGEMENT ADDITIONAL REMOTE CONTROL SWITCH | - |
| K010 | 4 STAGE PRESSURE SWITCH | |
| K086 | FROST SENSOR | - |
| L020 | AIR CONDITIONING COMPRESSOR ENGAGEMENT ELECTRO-MAGNET | - |
| M010 | ENGINE MANAGEMENT ECU | - |
| M070 | CLIMATE CONTROL SYSTEM CONTROL UNIT | - |
Description - COMPRESSOR ENGAGEMENT - Fiat DUCATO 2.3 JTD 16V da 03/05
The left button on the climate control system control unit switches on the air cooling and dehumidification circuit, activating the air conditioning compressor.The above button enables operation of the air cooling circuit, but actual compressor activation is also dependent upon activation of:the four-stage pressure switch located on the coolant circuit that locks air conditioner activation if coolant pressure is too low or high;the engine control unit that excludes compressor operation in accordance with engine management mode; e.g. in the case of high engine temperatures or high engine load (sudden acceleration);information from the antifrost thermostat about the presence or absence of condensation on the air conditioning system pipes.The compressor supply circuit is controlled by a special relay located in the engine bay junction unit. The relay supply line is protected by a special fuse.
Operational Description - COMPRESSOR ENGAGEMENT - Fiat DUCATO 2.3 JTD 16V da 03/05
The compressor activation circuit is controlled by relay T05, contained in engine bay junction unit B001. This is supplied directly by a line from the battery that enters at pin 1 of control unit connector F and is protected by fuse F19, located in the control unit.During engine start-up, control unit M010 of connector A pin 13 excites relay T09 to provide it with an earth signal. The relay receives power directly from the battery protected by fuse F18. Relay T05 is supplied in turn and excited by engine control unit M010, connector A pin 18, when compressor activation is required.The compressor actiation request comes from climate control unit M070 - pin 4. The signal firstly reaches electronic thermostat N086 and then antifrost thermostat K160. Engine control unit M010 processes signal from both frost thermostats and multistage pressure switch K010. If the pressure and temperature readings from the air conditioning system are correct, the control unit excites relay T05 via pin 18 of connector A to supply compressor L020.Climate control unit M070 receives a power supply via the ignition and direct from the battery. The former is protected by fuse F31 hosed in underfacia junction unit B002 and the latter is protected by fuse F34 housed in optional junction unit B101. The climate control unit contains its own internal lighting that comes on when the side lights are on.
