Relay
T5 of engine compartment junction
unit B1 controls the compressor activation circuit
The relay power supply passes through the
line of dedicated fuse F19 of engine bay junction unit
B1
The power supply to the coil of relay
T5
arrives from main injection relay
T9
and ignition-opeated
line (15/54) protected by fuse
F18
, both located in engine
compartment junction unit
B1 See E5050 DIESEL ENGINES ELECTRONIC MANAGEMENT
.
Functional description
According to its internal control logic,
the control unit
M10
sends the command - from pin 79 of
connector A - to engage the compressor which energizes the relay
T5
.
The activation electromagnet of air conditioner compressor in
L20
is therefore controlled at a voltage of 12V
If the linear sensor for fans
K120 indicates
that the pressure level is too high or too low to control unit M10
- pin 87 of connector A, control unit M10 cuts out compressor activation.
Linear sensor
K120
receives a power
supply and reference earth from the engine management control unit
M10
,
pins 10 and 37 of connector A.