BMW G12 2015 Technical Training Manual page 76

G12￿Voltage￿Supply￿and￿Bus￿Systems
4.￿Terminal￿Control
Terminal￿30F￿is￿used￿to￿supply￿control￿units￿which￿must￿perform￿functions￿in￿PARKING￿condition.
Terminal￿30F￿is￿normally￿switched￿on￿in￿PARKING￿condition,￿but￿may￿be￿switched￿off￿due￿to￿faults
in￿the￿vehicle￿electrical￿system.￿The￿terminal￿is￿switched￿off￿with￿an￿after-running￿period￿of￿1￿min
if￿a￿fault￿is￿detected.
Terminal￿30￿control￿units￿(e.g.￿alarm￿system)￿are￿always￿supplied￿with￿voltage￿and￿are￿also￿not
switched￿off￿in￿the￿event￿of￿a￿fault.
PARKING,￿vehicle
electrical￿system￿not
OK￿(fault￿in￿vehicle
electrical￿system)
PARKING,￿vehicle
electrical￿system￿OK
Stationary￿functions,
customer￿not￿in
vehicle
RESIDING
DRIVING
Testing￿Analysis￿Diagnosis￿(PAD)
The￿vehicle￿condition￿Testing/Analysis/Diagnosis￿is￿still￿present￿for￿diagnosis.￿All￿terminals￿are
switched￿on￿in￿this￿mode.￿This￿ensures￿that￿diagnosis￿can￿be￿performed￿with￿all￿control￿units.
This￿vehicle￿condition￿is￿displayed￿in￿the￿BMW￿diagnosis￿system.
4.3.￿Partial￿network￿operation
Today's￿premium￿vehicles￿contain￿up￿to￿70￿control￿units￿with￿well￿over￿100￿microcontrollers￿which￿are
networked￿with￿each￿other.￿However,￿depending￿on￿the￿current￿vehicle￿condition￿or￿the￿vehicle￿user
requirement,￿not￿all￿convenience￿and￿assistance￿systems￿need￿to￿be￿energized.
It￿is￿possible￿to￿save￿energy,￿relieve￿the￿load￿on￿the￿battery￿and￿also￿prolong￿the￿battery￿life￿by￿targeted
deactivation￿and￿activation￿on￿control￿units￿which￿are￿not￿needed,￿so-called￿selective￿partial￿network
operation.
If￿functions￿are￿not￿used￿or￿needed￿when￿driving,￿seat￿adjustment￿for￿example,￿the￿corresponding
control￿units￿can￿be￿switched￿off.
In￿vehicles￿with￿combustion￿engines,￿the￿electrical￿energy￿consumption￿is￿indirectly￿linked￿to￿the￿fuel
consumption￿via￿the￿alternator.￿As￿a￿result,￿selective￿deactivation￿of￿control￿units￿that￿are￿not￿currently
needed￿can￿contribute￿to￿reducing￿fuel￿consumption￿and￿thus￿also￿CO
4.3.1.￿Prerequisites￿for￿partial￿network￿operation
The￿partial￿network￿master￿in￿the￿Body￿Domain￿Controller￿calculates￿a￿partial￿network￿status￿on
the￿basis￿of￿the￿current￿vehicle￿condition￿and￿the￿required￿functions.￿The￿control￿units￿that￿are￿not
required￿are￿switched￿off￿by￿means￿of￿the￿corresponding￿bus￿messages.
70
Terminal￿30F
OFF
ON
ON
ON
ON
Terminal￿30B
OFF
OFF
ON
ON
ON
￿emissions.
2
Terminal￿15N
OFF
OFF
OFF
OFF
ON