600-2
ELECTRICAL
SYSTEM-GENERAL
CAUTION
-
"
Always
turn
off
the
engine
and
disconnect
the
negative
()
cable
from
the
batterybefore
remov-
ing
any
electrical
components
.
Disconnecting
the
battery
may
erase
fault
code(s)
stored
in
control
module
memory
.
Check
for
fault
codes
using
spe-
cial
BMW
diagnostic
equipment
.
"
Prior
to
disconnecting
the
battery,
read
the
bat-
tery
disconnection
cautions
given
at
the
front
of
this
manual
onpage
viii
.
"
Connect
and
disconnect
ignition
system
wires,
multiple
connectors,
and
ignition
test
equipment
leads
only
while
the
ignition
is
off
.
"
Do
not
disconnect
the
battery
with
engine
run-
ning
.
"
Do
not
quick-charge
the
battery
(for
boost
start-
ing)
for
longer
than
one
minute,
and
do
not
ex-
ceed
16
.5
volts
at
the
battery
with
the
boosting
cables
attached
.
Wait
at
feast
one
minute
before
boosting
the
battery
a
second
time
.
"
Do
not
usea
test
famp
that
has
a
normal
incan-
descent
bulb
to
test
circuits
contafning
electronic
components
.
The
high
electrical
consumptionof
these
test
lamps
may
damage
the
components
.
"
Do
not
use
an
analog
meter
.
Use
onfy
a
digital
multimeter
.
"
Many
of
the
solid-state
modules
are
static
sensi-
tive
.
Static
discharge
will
permanently
damage
them
.
Always
handle
the
modules
using
proper
static
prevention
equipment
and
techniques
.
"
To
avoid
damaging
harness
connectors
or
relay
panel
sockets,
use
jumper
wires
with
flat-blade
connectors
that
are
the
same
size
as
the
connec-
tor
or
relay
terminals
.
"
Always
switch
a
digital
multimeter
to
the
appropri-
ate
function
and
range
before
making
test
con-
nections
.
"
Do
not
tryto
start
the
engine
of
a
carwhich
has
been
heated
above176°F
(80°C),
(for
example,
in
a
paint
dryingbooth)
.
Allow
it
to
cool
to
normal
temperature
.
"
Disconnect
the
battery
before
dolng
any
electric
welding
on
the
car
.
"
Do
not
wash
the
engine
while
it
is
runnfng,
or
any-
time
the
ignition
is
switched
on
.
WIRING
DIAGRAMS
Electrical
Test
Equipment
Many
of
the
electrical
tests
described
in
this
manual
call
for
measuring
voltage,
currentorresistanceusing
a
digital
multi-
meter
(DMM)
.
Digital
meters
are
preferred
for
precise
mea-
surements
and
for
electronics
work
because
they
are
generally
more
accuratethan
analog
meters
.
The
numerical
display
is
alsoless
likely
to
be
misread,
since
there
is
no
nee-
dle
position
to
be
misinterpreted
by
reading
at
an
angle
.
An
LED
test
light
is
a
safe,
inexpensive
tool
that
can
be
used
to
perform
many
simple
electrical
tests
that
would
otherwise
require
a
digital
multimeter
.
The
LED
indicates
when
voltage
is
present
between
anytwo
test-points
in
a
circuit
.
CA
UTION-
"
Choose
test
equipment
carefully
.
Use
a
digital
multimeter
with
at
leadt
10
megaohm
input
im-
pedance,or
an
LED
test
light
.
An
analog
meter
(swing-need1e)
ora
test
light
with
a
normal
incan-
descent
bulb
may
draw
enough
current
to
dam-
age
sensitive
electronic
components
.
"
An
ohmmeter
must
not
beused
to
measure
resis-
tance
on
solidstate
components
suchas
controlunits
or
time
delay
relays
.
"
Always
disconnect
the
battery
before
making
re-
sístance
(ohm)
measurements
on
the
circuit
.
WIRING
DIAGRAMS
The
wiring
diagrams
shown
in
Electrical
Wiring
Diagrams
have
been
specially
designed
to
enable
quick
and
efficientdi-
agnosis
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
ab-
breviated
.
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
there
numbers
corresponds
to
a
particular
part
in
the
circuit
commonly
found
in
Electrical
Wiring
Diagrams
.
NOTE
-
Sometimes
the
color
of
en
installed
wire
may
be
differ-
ent
than
the
one
on
the
wiring
diagram
.
Don't
be
con-
cerned
.
Just
be
sure
lo
confirm
that
the
wire
connects
lo
the
proper
terminals
.
Wire
color
codes
"
BLU
.........
.
..
..
...
.
.................
Blue
"
BRN
....:....
.
..
..
...
..
...............
Brown
"
YEL
.........
.
..
..
...................
.Yellow
"
GRN
.........
.
..
..
...
.
................
creen
"
G
RY
.......
.
.
.
..
..
.....................
G
ray
"
ORG
.........
.
..
..
...
.
..............
.Orange
"
RED
......
...
.
.
..
.....................
.Red
"
BLK
.........
.
..
..
...
.
................
Black
"
VIO
..........
.
..
...
..
..
.......
.
.......
Violet
"
WHT
.........
.
.
....
.
...
:..............
White
Table
a
.
Terminal
and
Circuit
Numbers
Number
1
Circuít
description
1
j
Low
voltage
switched
terminal
of
coi¡
4
1
High
voltage
center
termina¡
of
coi¡
+x
Originates
atignition
switch
.
Supplies
powerwhen
the
ignition
switch
is
in
the
PARK,
RUN,
or
START
position
15
Originates
atignition
switch
.
Supplies
powerwhen
ignition
switch
is
in
RUN
or
START
position
30
Battery
positive
(+)
voltage
.
Supplies
power
whenever
battery
is
connected
.
(Not
dependent
on
ignition
switch
position,
unfused)
31
1
Ground,
battery
negative
(-)
terminal
50
Supplies
power
from
battery
to
starter
solenoid
when
ignition
switch
isin
START
position
only
+54
Originates
atignition
switch
.
Supplies
power
when
ignition
switch
isin
the
RUN
position
only
85
1
Ground
side
(-)
ofrelay
coil
86
1
Power-in
side
(+)
ofrelay
coil
87
1
Relay
actuatedcontact
D
Alternator
warning
light
and
field
energizing
circuit
ELECTRICAL
SYSTEM-GENERAL
600-
3
Additional
abbreviations
shown
in
the
wiring
diagrams
are
given
below
.
Abbreviations
"
ABS
........
.
...
.
...
.
..........
antilock
brakes
"
A/C
........
.
...
..
..
.
.........
.airconditioning
"
AST/ASC+T
.......
...
.
.
.......
al¡
season
traction
"
CONV
.......
.
.
...
.................
convertible
"
DME
........
.
.
...
.......
digital
motor
electronics
"
ECM
.......
.
...
..
..
.
..
electronic
control
module
"
EWS/EWS
II
......
...
.
.
coded
driveaway
protection
"
SRS
........
.
supplemental
restraint
system-airbag
"
TCM
........
.
..
....
.
transmission
control
module
"
ZKE
(94-98
models)
..
..
.
...
central
body
electronics
"
ZVM
(92-93
models)
...
.
.
..
.
.......
central
locking
ELECTRICAL
TROUBLESHOOTING
Most
terminals
are
identified
by
numbers
on
the
compo-
nents
and
harness
connectors
.
The
terminal
numbers
for
ma-
Four
things
are
required
for
current
toflow
in
any
electrical
jor
electrical
connections
are
shown
in
the
diagrams
.
Though
circuit
:
a
voltagesource,
wires
or
connections
to
transport
the
many
terminal
numbers
appear
only
once,
severa¡other
num-
voltage,
a
load
or
device
that
uses
the
electricity,
and
a
con-
bers
appear
in
numerous
places
throughout
the
electrical
sys-
nection
to
ground
.
Most
problemscanbefound
using
a
digital
tem
and
identify
certain
types
ofcircuits
.
Some
of
the
most
multimeter
(volt/ohm/amp
meter)to
check
for
voltage
supply,
common
circuit
numbers
are
listed
below
in
Table
a
.
for
breaks
in
the
wiring
(infinite
resistance/no
continuity),
orfor
a
path
to
ground
that
completesthe
circuit
.
Electric
current
is
logical
in
its
flow,
always
moving
from
the
voltage
sourcetoward
ground
.
Electricalfaults
can
usually
be
located
through
a
process
of
elimination
.
When
troubleshoot-
ing
a
complex
circuit,
separate
the
circuit
into
smaller
parts
.
The
general
testsoutlined
below
may
be
helpful
in
finding
electrical
problems
.
The
information
is
most
helpful
when
used
with
the
wiring
diagrams
.
Be
sure
to
analyze
the
problem
.
Use
the
wiring
diagrams
to
determine
the
most
likely
cause
.
Getan
understanding
of
how
the
circuit
works
by
following
the
circuit
from
groundback
to
the
power
source
.
When
making
test
connections
at
connectors
andcompo-
nents,
use
care
to
avoidspreading
or
damaging
the
connec-
tors
or
terminals
.
Some
tests
may
require
jumper
wires
to
bypass
components
or
connections
in
the
wiring
harness
.
When
connecting
jumper
wires,
use
bladeconnectors
at
the
wire
ends
that
match
the
size
of
the
terminal
being
tested
.
The
small
interna¡
contacts
are
easily
spread
apart,
and
this
can
cause
intermittent
or
faultyconnections
that
can
leadto
more
problems
.
ELECTRICAL
TROUBLESHOOTING
Table
a
.
E36
Component
Locations
Component
Model
Year
Location
Refer
to
Anti-theft
Control
Module
1992-1998
Behind
glove
compartment
Fig
.
8
.
Fig
.
9
.
Anti-theft
Horn
1
1992-1998
1
Right
rear
engine
compartment
Anti-slip
(Traction)
Control
Module
1994-1998
Power
distribution
box
Fig
.
8
.
(AST/ASC+T)
Fig
.
9
.
Anti-slip
(Traction)
Control
Switch
1994-1998
In
center
console
Automatic
Climate
(A/C)
Control
1992-1998
Behind
center
console
Module
AutomaticTransmission
Range
1992-1998
~
Next
to
gear
shift
lever
in
center
console
Fig
.
29
.
Switch
(Gear
Position/Neutral
Safety
Switch)
Auxiliary
Cooling
Fan
Dual
Switch
1992-1998
Right
side
radiator
1
Fig
.
18
.
Auxiliary
Cooling
Fan
Motor
1992-1998
Behind
front
grill
Auxiliary
Fuse
Box
(Left
Splice
1992-1998
I
Behind
left
front
footwell
kick-panel
Panel)
Auxiliary
RelayPanel
1
1992-1998
1
Left
side
of
dash
under
steering
column
Auxiliary
Fuse
Box
In
Trunk
1
1997-1998
1
Right
sideof
trunk
behind
trim
panel
AuADSry
ThrottlePosition
Motor
11994-1998
Front
of
engine
compartment
B+
Jump
Start
Junction
Point
1992-1998
Right
rear
of
engine
compartment
Fig
.
7
.
Back-Up
Light
Switch
(Manual)
1992-1998
Right
or
left
side
top
of
transmission
Fig
.
30
.
Body
Electronics
Control
Module
1994-1998
Behindglove
compartment
Fig
.
8
.
(ZKE
IV)
Fig
.
9
.
Brake
Fluid
Level
Sensor
1992-1998
Top
of
brake
fluid
reservoir
at
master
cylinder
Fig
.
15
.
Brake
Light
Switch
1
1992-1998
1
On
brake
pedal
supportbracket
Brake
Pad
Sensor,
Left
Front
1
1992-1998
1
Left
front
brake
caliper
Brake
Pad
Sensor,
Right
Rear
1992-1998
Right
rear
brake
caliper
Camshaft
Actuator
(VANOS)
1993-1998
Front
of
cylinder
head
Camshaft
Position
Sensor
(Cylinder
1992-1998
Front
of
engine
Identification)
Carbon
Canister
Valve
(TLEV)
1
1997-1998
1
In
sparewheel
well
in
trunk
ELECTRICAL
COMPONENT
LOCATIONS
610-11
Fig
.
5
.
Fig
.
4
.
Fig
.
24
.
Fig
.
7
.
Central
Locking
Module
(ZVM)
11992-1993
1
Behindglove
compartment
I
Fig
.
8
.
Fig
.
9
.
Check
Control
Module
(if
applicable)
1
1992
-
1998
1
Below
left
side
of
dash
Child
Protection
Window
Control
1992-1998
Center
console
(console)
Chime
Module
1992-1998
Below
left
side
of
dash
inleft
dash
trim
panel
Clock
(Multi-Function)
1993-1998
Center
console
Clutch
Pedal
Switch
1992-1998
On
clutch
pedal
support
bracket
Continued
COMPONENT
LOCATIONS
ELE
Power
E
1994-95
Exc
JMPSTART
B+JUMP
START
C710NPOINT
RED
JUNC710NPOIN7
RED
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.,
.
..
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ELECTRICAL
WIRING
DIAGRAMS
BATTERY
FUSE
LINK
REDRED
RED
RED
RED
1997
S
.JUMPSTART
JUNCTION
POINT
1996W/TRUNK
MOUNTED
BATTERY
----
1998W/ENGINE
¢
¢
¢
¢¢COMPTMOUNTED
BATTERY
1996&1997
3181,3181
.,
3181
CONVERTIBLE
b
~
_
I
ENGINETO
FUSE
F49
CONTROL
(DIAGRAM
2OF5)
MODULE
BATTERY
1997M3
&328i.32811,3281
CONVERTIBLE
f
FUSE
LINK
1996
M3
&3281
.
3281
..
3281
CONY
ERTIBLE
1996
W/ENGINE
1996
W/TRUNK
1997
1996
W/ENGINE
1996
WITRUNK
COMPTMOUNTED
MOUNTED
COMPTMOUNTED
MOUNTEDC
BATTERY
BATTERY
BATTERY
BATTERY
REDREDRED
MP
START
JUNCTION
POINT
Power
Distribution
1996-97
Except
318ti
(1
of
5)
RED
RED
RED
I
I
T=
BtJUMPSTART
JU
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POINT
_RED
RED
0
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6
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ENGINE
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MODULE
MOD
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PUMP
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RELAY
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(DIAGRAM
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5)
1997
B+
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START
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POINT
1996M3&3281,32811
.
1997M3&3281,3281
.,
1898&1997
3281
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3281CONVERTIBLF
3181.3181x,BC
3181CONVERTIBLE
10437
0
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4
26
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CONVERTIBLE
TOPCONTROLMODULE
ELECTRICAL
WIRING
DIAGRAMS
ELE-19
Power
Distribution
1998Except
318ti
(1
of
5)
FUEL
PUMP
161
X111010
FUEL
PUMP
15~X
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FRONT
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8
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.
M3
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BOX
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2
OF
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ELECTRICAL
WIRING
DIAGRAMS
TO
FUSE
F47
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4
OF
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9
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2
11
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10018
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FRONTPOWER
II
i
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1
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1
_I
Power
Distribution
1998Except
318ti
(2
of
5)
FUSE
F11
FUSE
15A
(W/0
CCM)
F30
7
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7
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_
_
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_
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61
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PEED
COMPRESSOR
HIGHSPEED
FRONTS-7
FRONTSEAT
FRONTSEATWASHER
DEFOGGER
RELAY
RELAY
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RELAY
CONTROL
LUMBAR
CONTROL
MODULE
RELAY
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M3)
RELAY
(318)
SWITCH
SWITCH
SWITCH
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CLUSTER
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BEAMLIGHT
LOWBEAM
MODULE
LOWBEAM
MODULE
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IV)
HEADLIGHT
HEADLIGHT
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ELE-32
ELECTRICAL
WIRING
DIAGRAMS
7
FUSE
LINK
BATTERY
10442
8
2
O
0
15IX74419
-------------
FRONTPOWER
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I
DISTRIBUTIONBOX
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1~sTxLn91B
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2x0
AUXILIARY
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I
FUSE
I
I
F47
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-
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19254
RED
JUNCTION
POINT
B.
JUMP
START
TOFSEFB
(DIAGRAM
20F3)
TO
FUSE
F3
.
TOFUSE
F
.
(DIAGRAM(DIAGRAM
2
T
30F3)
30F3)
I
Power
Distribution
1998
318ti
(1
of
3)
I
I
I
!
I
II
I
I
I
I
!
I
I
I
I
I
I
UNLOADER
ENGINE
ENGINE
TRANSMISSION
GENERATOR
STARTER
2
RELAY
CONTROLCONTROLCONTROL
MODULE
MODULE
MODULE(EGS)
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1588
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7~XLQOifl
1~X1DD15
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F20
r
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-
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FUSEFUSEBO
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SWITCH
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I
X
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F4
IF14
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(0)M
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20F3)0
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5
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7
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30A
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FUEL
HIGHS
PEED
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COMPRESSOR
BODY
SUNROOF
SUNROOFPUMP
RELAY
RELAY
CONTROL
ELECTRONICS
CONTROL
CONTROL
RELAY
CONTROLASSEMBLY
ASSEMBLY
MODULE
(ZKEIV)
____________-__-__
81
..
.+++
HIGH
FRONT
...
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/
T
BEAM
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I
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f
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t-_-_______
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HEADLIGHTHEADLIGHT