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Automotive Electricians Portal FZCO
Automotive Electricians Portal FZCO Location of componentsComponents DescriptionThe right button in the climate control control panel in the centre of the dashboard switches on the air cooling and dehumidifying circuit, activating the air conditioning compressor.The above button enables the operation of the air refrigeration circuit; the actual switching on of the compressor, however, also depends on the operation of:the frost thermostat sensor, near the evaporator, which stops the air conditioning being switched on if the temperature of the evaporator is too low;the 3 stage pressure switch, located in the refrigerant circuit, which stops the air conditioning being switched on if the pressure of the fluid is too low or too high;the engine control unit which, according to the engine management logic, excludes the operation of the compressor, for example in the case of high engine temperatures or in the case of high engine loads (sharp acceleration).
For more details 2888278see DESCRIPTION AND OPERATION:5040
AIR CONDITIONING CASING AND COMPONENTS . The compressor supply circuit is controlled by a specific relay, lcoated in the engine compartment in the relay and fuse box; the relay supply line is protected by a special fuse in the fuse box. Functional description The relay J20 controls the compressor engagment circuit. The relay is supplied by relay R1: line controlled by the ignition INT/A, protected by fuse F15: both are housed in the junction unit B1. The supply for the relay R1 comes from the direct line of the maxifuse J/B1 of B5, whilst the coil is supplied by the line (INT/A) protected by fuse B26. The relay J20 coil is always supplied by the line controlled by the ignition (INT/A) protected by fuse B27: this line also supplies the switch unit H80.Pressing the button in group H80, sends two signals:one to the electronic frost thermostat K86 which, if the temperature of the evaporator is not too low, sends another signal to the 3 stage pressure switch K5 . This, in turn, if the pressure in the circuit is correct, does not interrupt the signal which reaches the engine control unit M10 . Control unit M10 uses its own internal software to send an (earth) signal to activate the compressor which energizes the relay J20 . The relay operates the solenoid valve, at 12 V, which switches on the air conditioning compressor L20 . a second signal energizes the relay J34 coil which activates the first speed for the fan N85 , according to the description ( See E6020 AIR CONDITIONING ).
The fan operates at the first speed if the button for engaging the compressor is pressed, even if the control knob H81 is in position "0".
Fuse power supply ignition operated excl ignition (INT/A)
B026
B026
B026
B026
B026
Fuse power supply ignition operated excl ignition (INT/A)
B027
B027
B027
B027
Lambda sensor fuse
B036
B036
B036
B036
Diesel pre-heating fuse
B039
B039
B039
B039
Left front earth
C010A
C010B
C010C
C010C
C010D
C010D
C010A
C010A
C010A
C010A
C010A
C010A
C010A
C010A
Passenger side dashboard earth
C020
C020
C020
C020
C020
Earth on engine
C060
C060
C060
C060
C060
C060
C060
C060
Front/facia junction
D001A
D001A
D001A
D001A
D001A
D001A
D001A
D001A
D001A
D001A
D001A
D001A
D001B
D001B
D001B
D001B
D001B
D001B
D001B
D001B
D001B
D001B
D001B
D001C
D001A
D001A
D001A
D001A
D001A
D001A
D001A
D001A
D001C
D001C
D001C
D001C
D001C
D001C
D001C
D001C
D001A
D001C
D001C
Front/engine junction
D004A
D004A
D004B
D004B
D004
D004
D004
D004
D004A
D004A
D004B
D004B
D004B
D004B
D004B
D004
D004
D004
D004
D004B
D004B
D004B
D004B
D004B
D004B
D004B
D004B
D004B
Air conditioning heater front coupling
D008
D008
D008
D008
D008
D008
D008
D008
D008
D008
D008
D008
D008
D008
D008
D008
D008
D008
Ignition switch
H001A
H001A
H001A
H001B
H001B
H001B
H001B
H001B
H001B
H001B
H001B
H001B
H001B
H001B
H001B
H001B
H001B
Ignition switch
H001A
H001A
H001A
H001B
H001B
H001B
H001B
H001B
H001B
H001B
H001B
H001B
H001B
H001B
H001B
H001B
H001B
Ignition switch
H001A
H001A
H001A
H001B
H001B
H001B
H001B
H001B
H001B
H001B
H001B
H001B
H001B
H001B
H001B
H001B
H001B
Ignition switch
H001A
H001A
H001A
H001B
H001B
H001B
H001B
H001B
H001B
H001B
H001B
H001B
H001B
H001B
H001B
H001B
H001B
Ignition switch
H001A
H001A
H001A
H001B
H001B
H001B
H001B
H001B
H001B
H001B
H001B
H001B
H001B
H001B
H001B
H001B
H001B
Air conditioning compressor activation relay
J020
J020
J020
J020
Passenger compartment air fan 1 speed relay
J034
J034
J034
Additional heater relay
J036
J036
3 stage pressure switch
K005
K005
3 stage pressure switch
K005
K005
3 stage pressure switch
K005
K005
3 stage pressure switch
K005
K005
3 stage pressure switch
K005
K005
3 stage pressure switch
K005
K005
3 stage pressure switch
K005
K005
3 stage pressure switch
K005
K005
3 stage pressure switch
K005
K005