BMW G15 - Power Control Unit (PCU)

G15�General�Vehicle�Electronics
4.�Voltage�Supply
44
Luggage�compartment
G15�power�distribution�box,�luggage�compartment
The�following�relays�are�installed�in�the�luggage�compartment�power�distribution�box:
• 1�relay,�terminal�15N
• 2�relays,�terminal�30B
• 2�relays,�terminal�30F
• 1�relay,�rear�window�heating.
All�the�relays�are�bi-stable.�The�relays�are�activated�by�the�Body�Domain�Controller�via�a�LIN�bus.�The
luggage�compartment�power�distribution�box�controls�the�terminal�30B�relays�of�the�two�front�power
distribution�boxes.
Body�Domain�Controller
A�terminal�30F�relay�is�installed�in�the�Body�Domain�Controller�(BDC).
A�number�of�consumers�are�supplied�via�the�BDC�with�terminal�30�and�terminal�30F.
4.2.6.�Power�Control�Unit�with�vehicle�electrical�system�support
Present-day�vehicles�have�a�high�energy�consumption�due�to�the�many�electrical�consumers.�As�a
result,�there�is�a�high�demand�on�the�vehicle�battery�particularly�in�phases�in�which�the�combustion
engine�is�not�running�and�the�alternator�is�not�supplying�any�power�(e.g.�engine�start-stop�phases).
In�order�to�protect�the�vehicle�battery,�the�G15�is�fitted�with�DC/DC�converter�in�the�Power�Control�Unit
(PCU)�and�an�auxiliary�battery.