Relay T5 of junction unit
B1B controls
the compressor engagement circuit.
The relay supply arrives from the line of
maxifuse JB/3 of
B5 via the line for fuse F1 of junction unit
B1A.
The supply for the coil for relay T5 arrives
from the main injection relay T9 located in junction unit
B1B
See
E5030
PETROL ENGINE ELECTRONIC MANAGEMENT
.
Climate control system ECU
M70 sends
an enablement signal for compressor activation to 4-stage pressure
switch K10: if pressures in the coolant circuit are correct, the
signal emerges from the pressure switch and reaches engine control
ECU M10, pin 6 of connector A. According to its inner control
strategy, control unit M10 send a compressor activation command
from pin 13 of connector A which excites relay T5 so that the
electromagnet for activation of air conditioner compressor L20 is
controlled at 12 V.