1992 BMW M3 brakes

340-
1
2
BRAKES

ABS
is
self-tested
by
the
ABS
diagnostic
unit
each
time
the
car
is
started
.
Once
the
test
is
complete,
the
ABS
dashboard
light
tucos
off
.
If
the
light
remains
lit
or
comes
on
at
any
time
during
driving,
a
system
fault
has
occurred
and
ABS
is
elec-
tronically
disabled
.
The
conventional
braking
systemremains
fully
functioning
.

ABS
Inspection

A
visual
inspection
of
the
ABS
may
help
to
locate
system
faults
.
If
no
visual
faults
can
befound
and
the
ABS
light
re-
mains
on,
have
the
system
diagnosedbyan
authorized
BMW
dealer
.

Carefully
inspect
the
entire
ABS
wiring
harness,
particularly

the
pulse
sensorharnesses
and
connectors
near
each
wheel
.

Look
for
chafing
or
damage
due
to
incorrectly
routed
wires
.

Carefully
remove
the
wheelspeed
sensors
.
Clean
the
sen-



Fig
.
18
.
Front
ABS
pulse
sensor
mounting
bolt
(arrow)
.
sor
tips
.
Inspect
the
toothed
wheel
on
thewheel
hub
.
Check
for
missing,
clogged
or
corroded
teeth,
or
other
damage
that
could
alter
the
clearance
between
the
sensor
tip
and
the
toothed
wheel
.

NOTE-

If
a
toothed
ring
is
damaged,
the
entire
wheel
hub
mustbe
reptaced
.
See
310
Front
Suspension
or330
Rear
Suspension
.

ABS
wheel
speed
sensors,
replacing

1
.
Raise
applicable
end
of
car
.

WARNING
-

Make
sure
thecar
is
firmly
supportedon
jack
stands
designed
for
the
purpose
.
Place
the
jack
stands
be-
neath
a
structural
chassis
point
Do
not
place
jack
stands
under
suspension
parts
.

2
.
Unscrew
wheelspeed
sensor
mounting
bolt
.
Remove
sensor
from
its
housing
.
See
Fig
.
18
.
Remove
harnessfrom
retaining
mounts
.

3
.
Front
ABS
sensor
:
Working
in
front
wheel
housing,
dis-
connect
and
remove
sensor
.
See
Fig
.
19
.

4
.
Rear
ABS
sensor
:
Working
in
rear
wheel
housing,
dis-
connect
andremove
sensor
.

5
.
During
installation,
apply
thin
coat
of
Molykote
0
Long-
term
2
or
an
equivalent
grease
to
pulse
sensor
and
housing
.

ANTILOCK
BRAKE
SYSTEM
(ABS)

0012122
Fig
.
19
.
Front
ABS
wheel
speed
electrical
connector
(arrow)
in
wheel
well
.

6
.
Installation
is
reverse
of
removal
.

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

DATA
LINK
CONNECTOR
15,
VVHT/VEL

,26
RXDDATA
LK
15
W
NT/YEL
26
BR
/BLK
GR
IN
.
SIG
L2
I
i
f
7
BATTERVVOLT
~
f
~
FAULT
DSI
.X30
GRV/VEL
KICK-DOWN
SIG
MANMODESIG



1
Y;



EL/WHT

G
X3
!I
S1
RRNGSIGL4
S-PROGBUTT'
N



4YEL/GRN
GB
SHIFT
LK
GNOGN0
~BBRN/ORG

VOLTSUPPLY



2
Ri



ED/WHT
&
BLU
TCCSOLCTRL
BK
POL
POSIT
.



9
Ba
/
40
RED
HVDCTRL(a)
~-
41
GRV
HYO
CTRL
(-)
)
42
SOLVAL2CTRL
4~
X44
45
VIO
.AND

SOLVALICTRLI
~

TRANSMISSION
CONTROL
MODULE
(EGS)

PROGRAMSWITCH

88958

HOT
AT
ALL

ELECTRICAL
WIRING
DIAGRAMS
ELE-99

Transmission
Electronics

1995
3181,
3181C
&
3181s

rr~
Bt
I
'IpOIINTION
L
~J

VEL/BLU



BRN/ORG

2
HOT(NRUN



HOT
IN
RUN



HOT
INADDY
.
RUN
&
START



&START



START

1
VIC
SHIFT
LK
SOL



I
UTOMODESIG
YELIBLU



BRN

/



1



r
_



2
BRNGRV



G123
A

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VALVE,

-IFRONTPOWER
F4BE



DISTRIBUTION
BOX
5-_5-J
----
Z32YZf1001
.8
.VNT/VI
COMPUTERDATA



~
1
WHT/



I



GRNI
I



GRN/



VIO/VEL
LINES
SYSTEM



"
WHT/GRN/
1
YEL



ANTI-LOCK



WHT



GRV
W/A50
BRAKES
"



VIO/VEL
ONLY



SYSTEM



I



W/CCM



W/DOOM
`
EGS
WARNING
IF15



GRV/BRN
21
WHT/BLK



WHT/BLK

WN
T
/I



VIO/~



VIO/~
I
PT=O~
___
__
_



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YEL



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INSTRUMENTCLUSTER
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OFN



1



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BLK



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r
(LIGHT



LIGHT
BRN
"



I
I
SWITCH



SWITCH
II



I
NTROLS
EN
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DISTRIBUTION
BOX
CO
SYSTEM

WHT1I-1
MODULERELAY
L_--__-J
FRONTPOWER

2
-



BLUIRED
BLUIREDr



SOLENOID
WHT/GRN/



O
5
BLU/REOI
EXTERIOR



RGNCA
ASCSIGNAL



VEL



"
BLU/Ep
i
LIGHTS



SOLENOID
7
VEL/GRN



VEL/GRN
22



SYSTEM
SPROGI
NO



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-



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VALVE2
-
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GRRNGSIGL3
&
BLU/WHT



USED,



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8
NCA
Xfi9
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YEL/BLU



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YELIBLU
23



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71
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FLPMPRLVCTRL



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REGULATOR
M-FROG
IND



12
YEL/WHT



RED



S



NCATx-DATALK
WHT/VIO
SPY
1~
NOA14BLK
YI
---
OUTPUTSPD(-)
I
SBRN/GRV
BK
5
W
TEST
SIG
)1B
OILTEMPSIG



1T
OLR
1B
SPOSENSSHONCA
I
19
BRNGNO
20
YEL



9l
OUTPUT
S
PD
(a)
A/CCOMPON



1DLK/BLU
~-
OILTPSIG(t)
26LK
GRRNGSIGL1



38
12



LU/BLK

BRN/GRN
r
-
85



_
J



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FUELPUMPBELAY
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I
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___
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RE-/WHTJ
.
.
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5
r
I
I



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I
REDII



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ENGINECONTROL
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NCAGRY
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TORQUE
LIGHT



CONVERTER
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.
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IJ



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VALVE
-
W



BLU



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NOA
4
BRNT



BRN
&
NCA
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OIL
GRNI



I



TEMPERATURE
I
SENSOR
0200
1



BL
K



3



NCA
T



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CLR
4'
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II



SPEED
X8521
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VEL
A



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SENSOR
T
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BLK
2



INCA

"



xa53a
TRANSMISSION
VALVEUNIT
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BRN/GRN
1r
-------
r



WHT/GRN/YEL
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I
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WHTIBLKGI



ION-BOARD



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48
I
A/OCOMPCTRL



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BRN/GRY
64I



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BLK
BS
IIGNTIMINGINT



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8-



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PIN
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SHIFT
LOCK
2



r



WHT/GRN/

B

V

R

EL

N/



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ENDNECONTROL
MODULE(DME)

I
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1



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BRN/BLK
BLU/BLK

BRN/BLK



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2IE

0"

R
BRN/



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Y
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.



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BLU/VEL



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3
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G123
~-
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EGSA4S310R
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ICATOR



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ELE-100
ELECTRICAL
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