BMW 3 (E46). Manual — part 239
600-3
Wiring Diagrams
The wiring diagrams shown in
Electrical Wiring Diagrams have been
specially designed to enable quick and
efficient diagnosis and troubleshooting
of electrical malfunctions.
Wiring codes and
abbreviations
A lot of information is included in each
wiring diagram if you know how to read
them. Wire colors in the diagrams are
abbreviated. Combined color codes
indicate a multi-colored wire. For
example the code BLU/RED indicates a
blue wire with a red stripe.
Many electrical components,
connectors, fuses, and ground
locations are identified using a unique
number. Each of these numbers
corresponds to a particular part in the
circuit commonly found in Electrical
Wiring Diagrams.
Note:
Sometimes the color of an installed
wire may be different than the one on
the wiring diagram. Don't be concerned.
Just be sure to confirm that the wire
connects to the proper terminals.
Table b. Wire color codes
German
code
English
code
Color
SW
BLK
Black
BL
BLU
Blue
BR
BRN
Brown
GN
GRN
Green
Table b. Wire color codes
German
code
English
code
Color
GR
GRY
Grey
ORG
Orange
RT
RED
Red
VI
VIO
Violet
WS
WHT
White
GE
YEL
Yellow
Most terminals are identified by
numbers on components and harness
connectors. Terminal numbers for
major electrical connections are shown
in the diagrams. Though many terminal
numbers appear only once, several
other numbers appear in numerous
places throughout the electrical system
and identify certain types of circuits.
Some common circuit numbers are
listed below in
Table c.
Table c. Terminal and circuit
numbers
Number
Circuit description
1
Low voltage switched
terminal of coil
4
High voltage center
terminal of coil
+X
Originates at ignition
switch. Supplies power
when the ignition
switch is in the PARK,
RUN, or START
position
15
Originates at ignition
switch. Supplies power
when ignition switch is
in RUN or START
position
Table c. Terminal and circuit
numbers
Number
Circuit description
30
Battery positive (+)
voltage. Supplies
power whenever
battery is connected.
(Not dependent on
ignition switch position,
unfused)
31
Ground, battery
negative (-) terminal
50
Supplies power from
battery to starter
solenoid when ignition
switch is in START
position only
+54
Originates at ignition
switch. Supplies power
when ignition switch is
in the RUN position
only
85
Ground side (-) of relay
coil
86
Power-in side (+) of
relay coil
87
Relay actuated contact
D
Alternator warning light
and field energizing
circuit
Additional abbreviations shown in the
wiring diagrams are given below.
Table d. Common E46 abbreviation
Abbreviation
Component or system
Abbreviation
Component or system
ABS
antilock brakes
KL 50
ignition switch start position
A/C
air conditioning
LDP
fuel tank leak diagnosis
pump (DME MS 42.0)
Abbreviation
Component or system
Abbreviation
Component or system
ADB, ADB-X
automatic differential lock
LEV
low emission vehicle
AGS
adaptive transmission control LSZ
light switch module
AIC
rain sensor
MAF
mass air flow sensor
ASC
traction control
MBC
maximum braking control
AUC
automatic air recirculation
MFL
multifunction steering wheel
BST
Battery safety terminal
MRS
multiple restraint system
CAN
Controller Area Network
(BUS)
NLEV
national low emission
vehicle program
CBC
cornering brake control
NTC
negative temperature
coefficient resistor
DBC
dynamic brake control
OBC
on board computer
DK
throttle valve
OBD II
second generation on-board
diagnostics
DLC
diagnostic link connector
ORVR
on-board refueling vapor
recovery
DME
digital motor electronics
PDC
park distance control
(optional)
DMTL
diagnosis module-tank
leakage (DME MS 43.0)
PWG
pedal position sensor
DSC III
dynamic stability control
RAM
random access memory
DTC
diagnostic trouble code
RDC
tire pressure control
(optional)
DWA
anti-theft alarm system
RPS
rollover protection system
E-box
electronics box under engine
hood
RXD
receive data line
ECM
engine control module
SBE
front passenger seat sensor
EGS
electronic transmission
control
SGS
seat integrated belt system
EPROM
erasable/programmable
read-only memory
SHD
sunroof module
EWS
electronic immobilizer
SII
service interval indicator
FZV
keyless entry
SM
seat memory module
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