03 - G01 Voltage Supply and Bus Systems

Technical�training.
Product�information.
G01�Voltage�Supply�and�Bus�Systems
BMW�Service
General�information
Symbols�used
The�following�symbol�is�used�in�this�document�to�facilitate�better�comprehension�or�to�draw�attention
to�very�important�information:
Contains�important�safety�information�and�information�that�needs�to�be�observed�strictly�in�order�to
guarantee�the�smooth�operation�of�the�system.
Information�status�and�national-market�versions
BMW�Group�vehicles�meet�the�requirements�of�the�highest�safety�and�quality�standards.�Changes
in�requirements�for�environmental�protection,�customer�benefits�and�design�render�necessary
continuous�development�of�systems�and�components.�Consequently,�there�may�be�discrepancies
between�the�contents�of�this�document�and�the�vehicles�available�in�the�training�course.
This�document�basically�relates�to�the�European�version�of�left�hand�drive�vehicles.�Some�operating
elements�or�components�are�arranged�differently�in�right-hand�drive�vehicles�than�shown�in�the
graphics�in�this�document.�Further�differences�may�arise�as�the�result�of�the�equipment�specification�in
specific�markets�or�countries.
Additional�sources�of�information
Further�information�on�the�individual�topics�can�be�found�in�the�following:
• Owner's�Handbook
• Integrated�Service�Technical�Application.
Contact:�conceptinfo@bmw.de
©2017�BMW�AG,�Munich
Reprints�of�this�publication�or�its�parts�require�the�written�approval�of�BMW�AG,�Munich.
The�information�contained�in�this�document�forms�an�integral�part�of�the�BMW�Group�Technical
Qualification�and�is�intended�for�the�trainer�and�participants�in�the�seminar.�Refer�to�the�latest�relevant
information�systems�of�the�BMW�Group�for�any�changes/additions�to�the�technical�data.
Information�status:�June�2017
Technical�training.
Contents
1. Introduction............................................................................................................................................................................................................................................. 1
2. Bus� Systems..........................................................................................................................................................................................................................................2
2.1. Bus�overview................................................................................................................................................................................................................. 2
2.2. Main�bus�systems................................................................................................................................................................................................. 4
2.2.1. K-CAN.................................................................................................................................................................................................... 4
2.2.2. PT-CAN................................................................................................................................................................................................ 4
2.2.3. MOST...................................................................................................................................................................................................... 4
2.2.4. FlexRay.................................................................................................................................................................................................. 5
2.2.5. Ethernet............................................................................................................................................................................................... 6
2.2.6. D-CAN................................................................................................................................................................................................15
2.3. Sub-bus�systems...............................................................................................................................................................................................15
2.3.1. LIN-Bus............................................................................................................................................................................................ 15
2.3.2. Local�CAN....................................................................................................................................................................................25
2.3.3. USB........................................................................................................................................................................................................ 26
2.4. Diagnosis�access�OBD2........................................................................................................................................................................ 26
3. Control�Units.................................................................................................................................................................................................................................... 27
3.1. Installation�locations�of�control�units................................................................................................................................. 27
3.2. Gateway............................................................................................................................................................................................................................ 29
3.2.1. Body�Domain�Controller�(BDC)................................................................................................................. 29
4. Voltage�Supply............................................................................................................................................................................................................................. 32
4.1. Overview�of�voltage�supply............................................................................................................................................................... 32
4.1.1. System�wiring�diagram............................................................................................................................................32
4.2. Components.............................................................................................................................................................................................................. 34
4.2.1. Overview�of�luggage�compartment..................................................................................................... 34
4.2.2. Overview�of�engine�compartment......................................................................................................... 35
4.2.3. Battery............................................................................................................................................................................................... 35
4.2.4. Intelligent�battery�sensor..................................................................................................................................... 36
4.2.5. Safety�battery�terminal............................................................................................................................................ 36
4.2.6. Alternator.......................................................................................................................................................................................36
4.2.7. Integrated�supply�module................................................................................................................................... 37
4.2.8. Power�distribution�box,�front�right......................................................................................................... 37
4.2.9. Power�distribution�box,�rear............................................................................................................................ 38
4.2.10. Body�Domain�Controller....................................................................................................................................... 38
4.2.11. PCU�with�vehicle�electrical�system�assistance�measure................................... 38
5. Terminal�Control........................................................................................................................................................................................................................ 40
5.1. Introduction................................................................................................................................................................................................................. 40
5.2. Vehicle�conditions............................................................................................................................................................................................ 40
Contents
5.3. Power�supply�terminals........................................................................................................................................................................... 44
5.4. Partial�network�operation...................................................................................................................................................................... 45
5.4.1. Partial�network�operation�when�driving.........................................................................................46
5.4.2. Prerequisites�for�partial�network�operation............................................................................. 46
5.4.3. Prerequisites�of�control�units�for�partial�network�operation...........................46
5.4.4. Partial�network�operation�when�the�vehicle�is�stationary�and�the
engine�is�switched�off.............................................................................................................................................. 46
1.�Introduction
In�terms�of�technology,�the�new�BMW�X3�is�based�on�the�G12�and�G30.
1
2.�Bus�Systems
2.1.�Bus�overview
Bus�overview
2
2.�Bus�Systems
Index Explanation
ACC Active�Cruse�Control
ACSM Advanced�Crash�Safety�Module
AHM Trailer�module
AMPT Top�HiFi�amplifier
ASD Active�Sound�Design
BDC Body�Domain�Controller
CON Controller
DME Digital�Motor�Electronics
DSC Dynamic�Stability�Control
EGS Electronic�transmission�control
ENS Ethernet�switch
EPS Electromechanical�Power�Steering
FBD Remote�control�receiver
FLA High-beam�assistant
FLER Frontal�Light�Electronics�Right
FLEL Frontal�Light�Electronics�Left
FZD Roof�function�center
GWS Gear�selector
HEADUNIT Head�unit
HKFM Tailgate�function�module
IHKA Integrated�automatic�heating�/�air�conditioning
KAFAS Camera-based�driver�support�systems
KOMBI Instrument�panel
PCU Power�Control�Unit
PMA Parking�Manoeuvring�Assistant
RFK Rear�view�camera
RSL Radar�Sensor,�Left�(avoidance�assistant)
RSR Radar�Sensor,�Right�(avoidance�assistant)
SAS Optional�equipment�system
SMBF Seat�module,�passenger
SMFA Seat�module,�driver
SWW Lane�change�warning�(primary)
SWW2 Lane�change�warning�(secondary)
TCB Telematic�Communication�Box
TRSVC Top�Rear�Side�View�Camera
3
2.�Bus�Systems
Index Explanation
VDP Vertical�Dynamic�Platform
VTG Transfer�box
WCA Wireless�charging�tray
ZGM Central�gateway�module
1 Start-up�node�control�units�for�starting�and�synchronizing
the�FlexRay�bus�system
2 Control�units�with�wake-up�authorization
3 Control�units�also�connected�at�terminal�15WUP
2.2.�Main�bus�systems
2.2.1.�K-CAN
In�the�G01�the�following�K-CAN’s�are�used:
• K-CAN2
• K-CAN3
• K-CAN4
• K-CAN5
The�control�units�on�the�K-CAN5�are�not�displayed�in�the�bus�overview�by�the�BMW�diagnosis�system
ISTA.�Diagnosis�is�performed�via�the�Body�Domain�Controller.
All�K-CAN�data�buses�have�a�data�transfer�rate�of�500 kBit/s.
2.2.2.�PT-CAN
In�the�G01�the�following�PT-CAN�are�used:
• PT-CAN
• PT-CAN2
The�gateway�for�the�PT-CAN2�is�located�in�the�DME.
Both�PT-CAN�data�buses�have�a�data�transfer�rate�of�500 kBit/s.
2.2.3.�MOST
On�the�G01�the�MOST�system�known�from�other�BMW�models�with�a�data�transfer�rate�of�22.5 MBit/s
is�used.�The�gateway�for�the�MOST�system�is�located�in�the�HEAD�UNIT.
4
2.�Bus�Systems
2.2.4.�FlexRay
FlexRay
5
2.�Bus�Systems
Index Explanation
1 Dynamic�Stability�Control�(DSC)
2 Digital�Motor�Electronics�(DME)
3 Transfer�box
4 Electronic�Power�Steering�(electromechanical�power�steering)�(EPS)
5 Body�Domain�Controller�(BDC)
6 Vertical�Dynamics�Platform�(VDP)
7 Advanced�Crash�Safety�Module�(ACSM)
8 Optional�equipment�system�(SAS)
The�FlexRay�overview�includes�all�engine�versions�and�optional�equipment.�The�terminating�resistors
for�line�termination�are�located�in�the�control�units�and�in�the�Body�Domain�Controller.
The�FlexRay�has�a�data�transfer�rate�of�10 MBit/s.
2.2.5.�Ethernet
The�G01�features�the�two-wire�OABR�Ethernet�(OPEN�Alliance�BroadR-Reach)�which�is�familiar�from
the�G12.
The�Ethernet�variant�with�5�lines�(4�data�lines�and�1�activation�line)�is�still�used�on�the�G01�by�the
OBD2�interface�to�the�Body�Domain�Controller.
Use�of�the�two-wire�OABR�Ethernet�on�the�G01
The�following�control�units�are�connected�to�the�vehicle�electrical�system�via�two-wire�OABR�Ethernet
in�the�G01:
• Active�Cruise�Control�(ACC)
• Camera-based�driver�support�systems�(KAFAS)
• Top�Rear�Side�View�Camera�(TRSVC)
• Rear�view�camera�(RFK).
The�following�control�units�are�additionally�connected�via�two-wire�OABR�Ethernet�in�the�G01:
• Head�unit
• Optional�equipment�system�(SAS)
• Telematic�Communication�Box
Ethernet�in�the�vehicle
The�standard�"Open�Alliance�BroadR-Reach"�(OABR�Ethernet)�has�been�specially�developed�as�a
new�data�transmission�layer�for�use�in�vehicles.�OABR�Ethernet�only�requires�an�unshielded�twisted
two-wire�connection.�OABR�Ethernet�supports�bidirectional�100 MBit/s�communication�between�2
nodes.�This�means�that�both�nodes�can�simultaneously�send�and�receive�at�a�data�transfer�rate�of
6
2.�Bus�Systems
100 MBit/s.�OABR�Ethernet�requires�point-to-point�networking.�This�means�that�the�bus�system�is
not�split�up�between�multiple�nodes,�as�is�the�case�e.g.�with�CAN�(Controller�Area�Network)�systems.
Instead,�Ethernet�switches�are�used�for�the�connection�of�further�nodes.�Today,�Ethernet�switches�are
integrated�in�the�following�control�units:
• Body�Domain�Controller�(BDC)
• Optional�equipment�system�(SAS)
• Top�Rear�Side�View�Camera�(TRSVC).
An�Ethernet�switch�(ENS)�is�used�on�the�G01�depending�on�the�vehicle�equipment.�In�the�event�of
failure�of�an�Ethernet�switch,�all�bus�users�connected�by�it�are�disconnected�from�the�rest�of�the
network�and�are�no�longer�able�to�communicate�via�Ethernet.
Depending�on�the�vehicle�equipment,�the�control�units�are�connected�to�the�vehicle�electrical
system�in�different�ways.
On�vehicles�without�navigation,�the�data�transfer�takes�place�from�the�Headunit�Basic�to�the
instrument�cluster�via�Ethernet.
On�vehicles�with�Navigation,�the�data�is�transferred�from�the�Headunit�HIGH�to�the�instrument�cluster
via�an�APIX�data�cable.
Depending�on�the�vehicle�equipment�an�Ethernet�switch�may�in�some�cases�be�required.
A�wake-up�line�may�be�required�for�control�units�that�are�only�connected�to�the�Ethernet�and
are�not�additionally�connected�to�a�body�CAN.
Control�units�on�the�Ethernet�cannot�be�woken�up�via�the�bus.�Instead,�the�control�units�are�activated
via�the�wake-up�line�or�switched�directly�via�terminal�15.�As�a�result�of�the�activation�via�a�wake-up�line,
so-called�partial�network�operation�is�also�possible.�In�partial�network�operation,�individual�control�units
can�switch�to�a�rest�state�in�different�vehicle�conditions.
The�different�versions�of�the�Ethernet�topology�of�the�G01�are�listed�below:
Ethernet�topology�without�Ethernet�switch�on�vehicles�with�Headunit�Basic
The�wiring�diagram�shows�the�connection�of�the�top�rear�side�view�camera�(TRSVC)�control�unit�and
rear�view�camera�(RFK).�In�the�vehicle,�either�TRSVC�is�installed�for�a�vehicle�with�multiple�cameras,�or
RFK�for�a�vehicle�with�a�rear�view�camera�(standalone).
7
2.�Bus�Systems
Ethernet�topology�without�Ethernet�switch
8
2.�Bus�Systems
Index Explanation
1 Top�Rear�Side�View�Camera�(TRSVC)
2 Instrument�cluster�(KOMBI)
3 Camera-based�driver�support�systems�(KAFAS)
5 OBD2�interface�(Ethernet�with�5�lines)
6 Headunit�(HEADUNIT)
7 Telematic�Communication�Box�(TCB)
8 Rear�view�camera�(RFK)
Ethernet�topology�with�Ethernet�switch�on�vehicles�with�Headunit�Basic
9
2.�Bus�Systems
Ethernet�topology�with�Ethernet�switch
10
2.�Bus�Systems
Index Explanation
2 Ethernet�switch�(ENS)
4 Active�Cruise�Control�(ACC)
Ethernet�topology�on�vehicles�with�Headunit�High
On�vehicles�with�the�Headunit�High,�the�Telematic�Communication�Box�(TCB)�is�directly�connected�to
the�headunit.�The�data�is�transferred�from�the�Headunit�High�to�the�instrument�cluster�via�APIX.�The
instrument�cluster�does�not�require�Ethernet.�As�a�result,�the�Ethernet�interfaces�on�the�Body�Domain
Controller�are�sufficient,�and�no�Ethernet�switch�(ENS)�is�required.
11
2.�Bus�Systems
Ethernet�topology�on�vehicles�with�Headunit�High
12
2.�Bus�Systems
Index Explanation
8 APIX�data�line
On�vehicles�with�Navigation,�the�data�is�transferred�from�the�Headunit�High�to�the�instrument�cluster
via�APIX.
Ethernet�switch
Ethernet�switch
The�Ethernet�switch�is�required�for�expansion�of�the�Ethernet�network.�It�connects�the�control�units
and�forwards�their�data�packages�accordingly.
The�Ethernet�switch�is�displayed�as�a�control�unit�in�the�bus�overview�by�the�diagnosis�system�ISTA.
13
2.�Bus�Systems
Connections�on�the�Ethernet�switch
Ethernet�switch�connections
Index Explanation
1 Labelling�of�ports
2 Port�0
3 Port�1
4 Port�2
5 Port�3
6 Port�4
The�Ethernet�switch�has�a�maximum�of�5�ports.�The�Ethernet�cable�to�the�Body�Domain�Controller
(BDC)�is�connected�to�port�0.�In�addition,�voltage�for�the�Ethernet�switch�is�supplied�to�port�0.�The
other�Ethernet�control�units�are�connected�to�ports�1�to�4.�The�connectors�for�ports�1�to�4�are
identical,�so�the�other�Ethernet�control�units�can�be�connected�as�required.�It�does�not�matter�which
control�unit�is�connected�to�which�port�as�this�does�not�affect�the�function.�However,�for�diagnosis�and
troubleshooting,�it�is�important�to�know�which�control�unit�is�assigned�to�which�port.�If�the�Ethernet
switch�is�exchanged�or�the�Ethernet�cables�in�ports�1�to�4�have�been�connected�in�a�different�order,�a
port�configuration�must�be�carried�out�with�the�diagnosis�system�ISTA.
Without�a�port�configuration,�Ethernet�errors�cannot�be�detected�and�errors�can�therefore�not�be
stored.
14
2.�Bus�Systems
2.2.6.�D-CAN
The�D-CAN�has�a�data�transfer�rate�of�500�kBit/s.
2.3.�Sub-bus�systems
2.3.1.�LIN-Bus
For�a�better�overview,�the�LIN�buses�are�divided�up�between�several�wiring�diagrams�for�the�G01.
15
2.�Bus�Systems
LIN�bus�overview�in�the�door�area
LIN-Bus
16
2.�Bus�Systems
Index Explanation
2 Exterior�mirror,�front�passenger�side
3 Memory�seat,�front�passenger's�side
4 Power�window�electronics,�passenger's�side�front
5 Power�window�electronics,�passenger’s�side�rear
6 Non-contact�tailgate�opening
7 Power�window�electronics,�driver’s�side�rear
8 Power�window�electronics,�driver's�side�front
9 Memory�switch,�driver’s�side�front
10 Switch�block,�driver's�door
11 Exterior�mirror,�driver's�side
17
2.�Bus�Systems
LIN�bus�overview�for�engine�electrical�system�and�voltage�supply
LIN-Bus
18
2.�Bus�Systems
Index Explanation
1 Active�kidney�grills
2 Electric�fan
4 Rear�right�power�distribution�box
5 Intelligent�Battery�Sensor�(IBS)
6 Alternator
19
2.�Bus�Systems
LIN�bus�overview�for�roof�function�center
LIN-Bus
20
2.�Bus�Systems
Index Explanation
1 Rain‐light‐solar-condensation�sensor�(RLSBS)
2 Inside�mirror
3 Roof�function�center�(FZD)
5 Interior�lighting,�rear
6 Siren�with�tilt�alarm�sensor�(SINE)
21
2.�Bus�Systems
LIN�bus�overview�for�steering�column�switch�cluster�and�operating�units
LIN-Bus
22
2.�Bus�Systems
Index Explanation
2 Operating�unit,�center�console
3 Audio�operating�facility
4 HOD�touch�detection�(Hands�Off�Detection)
5 Steering�wheel�module
6 Multifunction�steering�wheel�buttons,�right
7 Operating�unit�for�light
8 Steering�column�switch�cluster�(SZL)
23
2.�Bus�Systems
LIN�bus�overview�for�integrated�automatic�heating/air�conditioning�system
LIN-Bus
24
2.�Bus�Systems
Index Explanation
1 Blower�motor
2 Operating�unit,�rear�passenger�compartment
3 Stepper�motor�for�air�distribution,�rear�passenger�compartment
4 Stepper�motor�for�air�distribution,�left
5 Stepper�motor�for�stratification,�left
6 Stepper�motor�for�mixed�air,�left
7 Stepper�motor�for�temperature,�rear�passenger�compartment
8 Stepper�motor�for�mixed�air,�right
9 Stepper�motor�for�stratification,�right
10 Stepper�motor�for�air�distribution,�right
11 Stepper�motor�for�defrost�function
12 Stepper�motor�for�fresh�air/air�recirculation�function
13 Operating�unit,�air�conditioning
14 Integrated�automatic�heating�/�air�conditioning�(IHKA)
2.3.2.�Local�CAN
In�the�G01�the�following�Local�Controller�Area�Networks�are�available�with�the�corresponding
equipment:
• Local�CAN�from�the�camera-based�driver�assistance�system�(KAFAS)�to�the�Parking
Manoeuvring�Assistant�(PMA)
• Local�CAN�from�the�optional�equipment�system�(SAS)�to�the�radar�sensor,�front�right�(RSR)
• Local�CAN�from�the�optional�equipment�system�(SAS)�to�the�radar�sensor,�front�left�(RSL)�and
lane�change�warning�(secondary)�(SWW2)
• Local�CAN�from�the�lane�change�warning�(primary)�(SWW)�to�the�radar�sensor,�right�(RSR),�to
the�radar�sensor,�left�(RSL),�and�to�the�lane�change�warning�(secondary)�SWW2.
The�control�units�on�the�local�CAN�are�not�displayed�in�the�bus�overview�by�the�BMW�diagnosis
system�ISTA.�Diagnosis�takes�place�via�the�corresponding�primary�control�unit.
The�local�CAN�buses�have�a�data�transfer�rate�of�500 kBit/s.
25
2.�Bus�Systems
2.3.3.�USB
The�following�USB�interfaces�are�provided�in�the�G01�depending�on�the�vehicle�equipment:
• USB�interface�in�the�center�console�(standard)
• USB�interface�in�the�center�armrest
2.4.�Diagnosis�access�OBD2
The�vehicle�diagnosis�via�D-CAN�is�effected�using�the�OBD2�interface.�The�Ethernet�access�for�the
vehicle�programming�is�also�located�in�the�OBD2�interface.
26
3.�Control�Units
3.1.�Installation�locations�of�control�units
Installation�locations�of�control�units
Index Explanation
2 Lane�change�warning�(secondary)�(SWW2)
4 Top�HiFi�amplifier�(AMPT)
5 Control�unit�for�rear�view�camera�and�side�view�(TRSVC)
6 Remote�control�receiver�(remote�control�service)
7 Active�Sound�Design�(ASD)
8 Wireless�Charging�Station�(WCA)�(Location�moved�in�front�of�cup�holders�in
center�console,�not�under�center�arm�rest)
9 Roof�function�center�(FZD)
27
Index Explanation
11 High-beam�assistant�(FLA)
13 Ethernet�switch�(ENS)
16 Dynamic�Stability�Control�(DSC)
17 Frontal�Light�Electronics�Right�(FLER)
18 Radar�Sensor�Left�(RSL)
20 Frontal�Light�Electronics�Right�(FLER)
21 Radar�Sensor�Right�(RSR)
22 Electronic�Power�Steering�(EPS)
23 Electronic�transmission�control�(EGS)
24 Transfer�box�(VTG)
25 Headunit
26 Driver's�seat�module�(SMFA)
27 Gear�selector�switch�(GWS)
28 Integrated�automatic�heating�/�air�conditioning�(IHKA)
30 Controller�(CON)
31 Front�passenger�seat�module,�(SMBF)
32 Advanced�Crash�Safety�Module�(ACSM)
33 Trailer�module�(AHM)
34 Power�Control�Unit�(PCU)
35 Lane�change�warning�(SWW)�(primary)
36 Tailgate�function�module�(HKFM)
37 Vertical�Dynamic�Platform�(VDP)
38 Parking�Manoeuvring�Assistant�(PMA)
28
3.2.�Gateway
3.2.1.�Body�Domain�Controller�(BDC)
Body�Domain�Controller�(BDC)
BDC�functions
The�Body�Domain�Controller�(BDC)�is�responsible�for�the�following�functions:
• Gateway
• Electronic�immobilizer
• Terminal�control
• Central�locking�system
• Exterior�lights
• Power�windows
• Horn
• Interior�light
• Wash/wipe�system
• Vehicle�data�storage
• Data�transfer�for�Condition�Based�Service�(CBS).
Fuses�in�the�BDC
The�following�components�are�protected�by�fuses�in�the�BDC:
• Audio�operating�facility
• Operating�facility�for�assist�systems
• Operating�unit�for�light
• Power�windows
29
• Heated�rear�window
• Tailgate�function�module
• Integrated�automatic�heating�/�air�conditioning
• OBD2�interface
• Power�Control�Unit
• Rain‐light‐solar-condensation�sensor
• Steering�column�switch�cluster
• Telematic�Communication�Box
• Outside�door�handle�electronics
• Vertical�dynamics�platform�(electronics)
• Wiper�motor.
Relay�in�the�BDC
The�following�relays�are�located�in�the�BDC:
• Terminal�30F
• Power�window�regulator
• Heated�rear�window
• Wiper�motor
• Headlight�cleaning�system.
Gateway�in�the�BDC
The�central�gateway�module�(ZGM)�is�integrated�in�the�BDC.�It�is�viewed�as�a�control�unit�within�a
control�unit,�in�that�the�ZGM�in�the�BDC.�The�task�of�the�ZGM�is�to�connect�all�the�data�bus�systems
to�each�other.�By�connecting�them�in�this�way,�it�is�possible�to�use�information�from�the�individual�bus
systems�on�a�generalized�level.�The�central�gateway�module�is�able�to�implement�different�protocols
and�speeds�on�other�bus�systems.�The�programming�data�for�the�control�units�is�transmitted�by
Ethernet�to�the�vehicle�via�the�ZGM.
LIN�controller�in�the�BDC
The�BDC�is�the�gateway�for�the�following�components�at�the�local�interconnect�network�bus:
• Exterior�mirror,�left�and�right
• Switch�block,�driver's�door,�front�passenger�door
• Steering�column�switch�cluster
• Light�switch
• Intelligent�Safety�button
30
• Audio�operating�facility
• Inside�mirror
• Rain‐light‐solar-condensation�sensor
• Roof�function�center�(interior�lighting)
• Comfort�seat,�rear�passenger�compartment,�left�and�right
• Operating�unit,�center�console
• Power�distribution�box,�rear.
The�following�control�units�are�connected�to�the�BDC�via�LIN,�but�the�BDC�has�only�a�wake-up
function�and�not�a�gateway�or�primary�function:
• Battery�charging�unit
• Intelligent�battery�sensor
• Electric�fan
• Active�air�flap�control
• Digital�Motor�Electronics.
31
4.�Voltage�Supply
4.1.�Overview�of�voltage�supply
4.1.1.�System�wiring�diagram
Voltage�supply
32
Index Explanation
2 Starter�motor
3 Alternator
4 Power�distribution�box,�engine�compartment
5 Jump�start�terminal�point
6 Auxiliary�battery,�engine�compartment
7 Power�distribution�box,�front�right
9 Fuse�in�the�Body�Domain�Controller
10 CAN�terminator
11 Power�distribution�box,�rear
12 Power�Control�Unit�(PCU)�500�W
13 Battery�power�distribution�box
14 Safety�battery�terminal
15 Battery
33
4.2.�Components
4.2.1.�Overview�of�luggage�compartment
Battery
Index Explanation
1 Power�distribution�box,�rear
2 Power�Control�Unit�(PCU)�500�W
3 Power�distribution�box�with�safety�battery�terminal
4 Battery
The�vehicle�battery�in�the�G01�is�an�AGM�battery�with�90�Ah.
34
4.2.2.�Overview�of�engine�compartment
Auxiliary�battery,�engine�compartment
Index Explanation
1 Power�distribution�box,�engine�compartment
2 Auxiliary�battery,�engine�compartment
3 Jump�start�terminal�point
The�auxiliary�battery�in�the�engine�compartment�of�the�G01�is�an�AGM�battery�with�50�Ah.
4.2.3.�Battery
AGM�batteries�are�used�for�the�voltage�supply�in�the�G01.
There�may�be�1�or�2�batteries�in�the�vehicle�depending�on�the�engine�version�and�vehicle�equipment.
• Starter�battery�in�the�luggage�compartment�with�90�Ah
• Auxiliary�battery�in�the�engine�compartment�with�50�Ah.
An�auxiliary�battery�in�the�engine�compartment�is�used�to�provide�assistance�for�the�vehicle�electrical
system.
35
4.2.4.�Intelligent�battery�sensor
The�IBS�records�the�following�data�of�the�12 V�battery:
• Voltage
• Current
• Pole�temperature
The�IBS�performs�the�calculation�and�the�evaluation�of�the�information.�The�results�are�then�forwarded
to�the�DME�and�BDC�via�LIN�bus�.
4.2.5.�Safety�battery�terminal
Safety�battery�terminal
The�safety�battery�terminal�(SBK)�is�activated�in�the�event�of�an�accident�of�corresponding�severity.
The�voltage�supply�to�the�positive�battery�connection�point�in�the�engine�compartment�is�interrupted
and�the�consumers�connected�to�this�are�de-energized.�The�safety�battery�terminal�is�installed�in�the
power�distribution�box�next�to�the�battery.
4.2.6.�Alternator
An�alternator�with�increased�efficiency�is�used�in�the�G01.�The�increase�in�alternator�efficiency�is
achieved�by�reducing�the�losses�in�the�rectifier.�The�loss-causing�diodes�are�replaced�by�actively
activated�MOSFET�transistors.�A�reduction�in�fuel�consumption�is�achieved�by�increasing�the
efficiency.
Different�alternators�are�used�depending�on�the�engine�type�and�vehicle�equipment.
36
4.2.7.�Integrated�supply�module
Integrated�supply�module
The�engine�control�and�its�components�are�supplied�with�a�12 V�voltage�via�the�integrated�supply
module.
4.2.8.�Power�distribution�box,�front�right
Power�distribution�box,�front�right
A�relay�for�terminal�30B�is�installed�in�the�front�right�power�distribution�box.
Consumers�are�supplied�with�terminal�30�and�terminal�30B�and�provided�with�corresponding�fuse
protection�by�the�front�right�power�distribution�box.
37
4.2.9.�Power�distribution�box,�rear
Power�distribution�box,�rear
The�following�relays�are�installed�in�the�rear�power�distribution�box:
• 2�Relay,�terminal�30F
• 2�Relay,�terminal�30B
• Relay,�terminal�15N
• Relay�for�rear�window�heating.
All�relays�are�bi-stable�relays.�The�relays�are�activated�by�the�Body�Domain�Controller�via�LIN.�The
terminal�30B�relay�in�the�front�right�power�distribution�box�is�activated�by�the�rear�power�distribution
box.
4.2.10.�Body�Domain�Controller
The�Body�Domain�Controller�(BDC)�is�responsible�for�the�terminal�control.
A�terminal�30F�relay�is�installed�in�the�BDC.
A�number�of�consumers�are�supplied�with�terminal�30�and�terminal�30F�and�provided�with
corresponding�fuse�protection�via�the�BDC.
4.2.11.�PCU�with�vehicle�electrical�system�assistance�measure
BMW�vehicles�have�a�high�energy�consumption�due�to�the�many�electrical�consumers.�As�a�result,
there�is�a�high�demand�on�the�battery,�particularly�in�phases�in�which�the�combustion�engine�is�not
running�and�the�alternator�supplies�no�energy�(e.g.�engine�start-stop�phases).
In�order�to�protect�the�vehicle�battery,�a�DC/DC�converter�is�installed�in�the�Power�Control�Unit�(PCU)
and�an�auxiliary�battery�in�the�engine�compartment�in�the�G01.
38
The�preconditions�for�the�direction�of�the�energy�management�are�calculated�from�the�use�of�the
vehicle.�When�the�engine�is�running�the�auxiliary�battery�is�charged�from�the�conventional�vehicle
electrical�system.�During�the�phases�in�which�the�combustion�engine�is�not�running,�e.g.�automatic
engine�start-stop�function,�the�energy�is�supplied�from�the�auxiliary�battery�into�the�conventional
vehicle�electrical�system.
The�Power�Control�Unit�(PCU)�contains�a�control�unit�which�is�connected�to�the�PT-CAN2�and�the
DC/DC�converter�with�a�power�of�500 W.
39
5.�Terminal�Control
5.1.�Introduction
The�terminal�control�in�the�G01�is�identical�to�the�terminal�control�of�the�G12.�In�the�G01,�the�vehicle
is�always�in�the�right�condition�from�the�point�of�view�of�the�customer.�The�terminals�are�controlled
via�a�customer-oriented�condition�management.�The�terminal�control�is�dependent�on�the�driving
conditions.
5.2.�Vehicle�conditions
The�G01�vehicle�may�be�in�the�following�conditions:
• Parking
• Residing
• Driving
The�different�vehicle�functions�are�possible�depending�on�the�relevant�conditions.
Parking
• Customer�not�in�the�vehicle
• Vehicle�secured�or�not�used�for�a�certain�time
• Vehicle�functions�cannot�be�operated.
Residing
• Customer�in�the�vehicle
• No�driving�readiness
• Functions�that�are�relevant�when�the�vehicle�is�stationary�can�be�operated.
Driving
• Customer�in�the�vehicle
• Driving�readiness�established
• All�functions�are�available.
The�driving�conditions�are�changed�by�condition�management,�taking�into�account�the�customer
behavior.�Additional�information�is�also�evaluated�that�may�help�to�determine�the�vehicle�condition,
e.g.:
• Door�opening
• Door�closing
• Operations�in�the�vehicle.
40
The�following�diagram�shows�the�changes�between�the�vehicle�conditions.
Vehicle�conditions
Index Explanation
A Vehicle�condition�PARKING
B Transitional�condition�with�stationary�functions
C Vehicle�condition�RESIDING
D Transitional�condition�for�establishing�driving�readiness,�ending�driving
readiness�or�Testing/Analysis/Diagnosis
E Vehicle�condition�DRIVING
1 Unlock�vehicle
2 Operation�of�start/stop�button�+�brake�pedal
3 Press�START-STOP�button
4 Locks�vehicle
5 No�activity�of�a�vehicle�user�detected�for�10 min
6 Extended�press
41
Detailed�overview�of�vehicle�conditions.
Overview�of�vehicle�conditions
Index Explanation
A Vehicle�condition�DRIVING
B Vehicle�condition�RESIDING
C Vehicle�condition�PARKING
a Transitional�condition�for�ESTABLISHING/ENDING�DRIVING�READINESS,
CHECK/ANALYSIS/DIAGNOSIS
b Transitional�condition�with�STATIONARY�FUNCTIONS
42
Index Explanation
1 Operation�of�start/stop�button�+�brake�pedal�+�valid�remote�control�or�valid�ID
transmitter�in�the�vehicle�interior
2 Driving�readiness�established,�terminal�15N�(terminal�50)
3 Operation�of�start/stop�button�(three�times�within�0,8�s)�+�valid�remote�control
or�valid�ID�transmitter�in�the�vehicle�interior
4 Terminal�15N
5 Operation�of�start/stop�button�+�selector�lever�in�Neutral
6 Undoing�driver's�seat�belt�(v�<�0.1�km/h,�driver's�door�opened,�selector�lever
not�in�Neutral,�brake�not�pressed,�low�beam�off,�no�OBD�communication,�no
diagnosis�mode,�no�assembly�mode)
7 Door�contact�change�(v�<�0.1�km/h,�driver's�seat�belt�undone,�selector�lever
not�in�Neutral,�brake�not�pressed,�low�beam�off,�no�OBD�communication,�no
diagnosis�mode,�no�assembly�mode)
8 Press�start/stop�button�+�vehicle�is�stationary�or�press�start/stop�button�for�at
least�1 s�+�driving�speed�≥�10�km/h�(6�mph)�or�press�start/stop�button�at�least
three�times�within�4 s�+�driving�speed�≥�10�km/h�(6�mph)
9 Press�START-STOP�button
10 Terminal�30B
11 Unlock�vehicle
12 Residing�interaction�or�stationary�function�interaction
13 Locks�vehicle
14 No�customer�interaction�for�ten�minutes
15 Extended�press�of�headunit�media�button
16 Terminal�30F
43
Automatic�switch-off
Automatic�switch-off
Switch�off�after�door�opening:
In�the�menu�"Doors/Keys",�an�immediate�change�from�the�vehicle�condition�RESIDING�to�the�vehicle
condition�PARKING�can�be�activated.
If�this�option�is�activated,�then�the�system�will�immediately�change�to�the�vehicle�condition�PARKING
when�the�driver's�door�is�opened.�The�elimination�of�the�after-running�period�in�the�residing�vehicle
condition�saves�energy.
5.3.�Power�supply�terminals
Control�units�in�the�vehicle�must�be�supplied�with�power�only�when�they�are�needed.�The�following
terminals�are�used�in�the�G01:
• Terminal�15N
• Terminal�30B
• Terminal�30F
• Terminal�30
Terminal�15N�supplies�control�units�which�are�needed�only�when�driving�and�which�may�be�needed�to
safely�end�a�journey.�After-run�of�5�s�starts�at�the�transition�from�DRIVING�to�RESIDING.
Terminal�30B�is�used�to�supply�control�units�that�are�needed�in�the�stationary�mode�RESIDING�and�for
stationary�functions�where�the�customer�is�not�in�the�vehicle.�An�after-run�of�6�minutes�starts�at�the
transition�from�RESIDING�to�PARKING,�and�terminal�30B�is�then�switched�off.
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.
44
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.
Terminal�30F Terminal�30B Terminal�15N

PARKING,�vehicle off off off
electrical�system�not
OK�(fault�in�vehicle
electrical�system)
PARKING,�vehicle on off off
electrical�system�OK
Stationary�functions on on off
(customer�not�in
vehicle)
RESIDING on on off
DRIVING on on on
Testing-analysis-diagnosis�(PAD)�mode
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�ISTA.
Activation�of�the�PAD�mode:
• Operation�of�the�start/stop�button�(three�times�within�0.8 s)�+�valid�remote�control�or�valid�ID
transmitter�in�the�vehicle�interior
• By�the�BMW�diagnosis�system�ISTA.
The�PAD�mode�is�exited�by�pressing�the�start/stop�button�or�by�closing�the�diagnosis�with�the
diagnosis�system�ISTA.
5.4.�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�may�always�be�needed.
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.
In�vehicles�with�combustion�engine,�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�CO2�emissions.
45
5.4.1.�Partial�network�operation�when�driving
If�functions�are�not�used�or�needed�when�driving,�e.g.:
• Seat�adjustment
• Trailer�lighting�(no�trailer�attached)
the�corresponding�control�units�can�be�switched�off.
5.4.2.�Prerequisites�for�partial�network�operation
The�partial�network�primary�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.
5.4.3.�Prerequisites�of�control�units�for�partial�network�operation
Different�transceivers�are�used�in�order�to�realize�partial�network�operation�in�control�units.�These
transceivers�are�able�to�evaluate�and�interpret�messages.�This�control�unit�remains�switched�off�as
long�as�any�bus�communication�takes�place�without�a�valid�wake-up�event�for�the�corresponding
control�unit�being�present.�If�a�valid�wake-up�event�for�the�corresponding�control�unit�is�sent�on�the
bus,�the�transceiver�can�activate�the�voltage�regulator�of�the�microcontroller�and�the�control�unit�starts
up.�The�control�unit�is�switched�off�by�deactivation�of�the�voltage�regulator.
5.4.4.�Partial�network�operation�when�the�vehicle�is�stationary�and�the�engine
is�switched�off
For�example,�if�only�the�radio�function�is�required�when�the�engine�is�switched�off,�the�bus�systems
which�are�not�required�are�switched�off.�If�an�operation�is�then�carried�out�with�the�controller,�for
example,�the�buses�are�woken�up�again.�Once�the�operation�has�been�carried�out,�the�bus�systems
which�are�not�required�are�switched�off�again.�Switching�off�the�bus�systems�which�are�not�required
along�with�the�corresponding�control�units�saves�energy.�The�reduced�energy�consumption�means,�for
example,�that�it�is�possible�to�play�the�radio�for�significantly�longer�before�it�is�switched�off�due�to�the
battery�being�too�drained.
46
Bayerische�Motorenwerke�Aktiengesellschaft
Händlerqualifizierung�und�Training
Röntgenstraße�7
85716�Unterschleißheim,�Germany

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Terminal�30F Terminal�30B Terminal�15N

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