BMW F48 Technical Training Manual page 47

F48￿General￿Vehicle￿Electronics
5.￿Heating/Air￿Conditioning￿Systems
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.
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