BMW F48 - HVAC System Components

F48�General�Vehicle�Electronics
5.�Heating/Air�Conditioning�Systems
43
Components
Sensors�and�actuators�which�are�connected�to�the�Body�Domain�Controller�(BDC)�control�unit�are
involved�in�the�function�of�the�heating�and�air-conditioning�system�in�the�F48:
• Pressure�sensor
The�BDC�evaluates�the�pressure�sensor�signal�and�makes�it�available�to�the�IHKA�control�unit
via�the�K-CAN4.
• Blower
The�IHKA�request�is�sent�via�the�LIN�bus�to�the�blower.
• Air�conditioning�compressor
The�air�conditioning�compressor�is�controlled�by�the�BDC�by�means�of�a�pulse-width-
modulated�signal.�The�BDC�can�also�actuate�the�air�conditioning�compressor�clutch.
However,�the�request�is�always�made�by�the�IHKA.
• Automatic�air�recirculation�control�sensor
The�automatic�air�recirculation�control�sensor�is�read�by�the�BDC�via�a�local�interconnect
network�bus.�The�IHKA�assumes�the�automatic�air�flap�control,�which�communicates
with�the�BDC�via�K-CAN4.
• Rain-light-solar-condensation�sensor�(RLSBS)
The�rain-light-solar-condensation�sensor�communicates�with�the�BDC�via�a
local�interconnect�network�bus.