When required, the climate control system
ECU automatically activates the cooling circuit and dehumidifies
the air by operating the air conditioner compressor.The appropriate button in the climate control
control panel enables operation of the air cooling circuit; when
the button is pressed the LED comes on.
The above button enables the operation of
the air cooling circuit; the actual switching on of the compressor,
however, also depends on the climate control system ECU operating strategy:
for more details
Characteristic
of working principle 5040 AIR CONDITIONING CASING AND COMPONENTS
.
The compressor can also be switched off
by the intervention of the four stage pressure switch or by the
engine control unit
Characteristic
of working principle 1060 DIESEL FUEL INJECTION
.
The compressor is controlled by means of
a special relay located in the engine bay control unit. the supply
line is protected by a specific fuse, again in the engine bay control
unit.