When required, the climate control system
ECU automatically activates the cooling circuit and dehumidifies
the air by operating the air conditioner compressor.
For further details see
Characteristic of working principle 5040 AIR CONDITIONING CASING
AND COMPONENTS
.
The compressor may also be deactivated by
the 4-stage pressure switch or the engine management unit according
to the engine management software, which is different for each engine
version (see
Characteristic
of working principle 1060 DIESEL FUEL INJECTION
)
The compressor supply circuit is controlled
by a specific relay, located in the engine compartment junction
unit. The relay contact line is protected by a dedicated fuse, located in
the engine compartment junction unit.