Engine harness BMW 318i 1994 E36 Repair Manual

170-
4



RADIATOR
AND
COOLING
SYSTEM
A
quick
testat
the
coolant
temperature
gauge
sender
can



The
auxiliary
cooling
fan
comes
on
when
coolant
tempera

determine
if
the
gauge
is
functioning
correctly
.



ture
exceeds
a
predetermined
leve¡
or
whenever
the
air
condi-

tioning
is
on
.
A
dual-range
temperature
switch
for
cooling
fan
lf
the
gauge
needie
remains
at
the
rest
position
with
theen-



control
is
mounted
on
the
right
side
of
the
radiator
.
See
Fig
.
3
.
gine
warm,
remove
the
harness
connector
from
the
sender
and
jumper
the
correct
terminals
in
the
connector
to
simulate
a
high
engine
temperature
.
See
Table
a
.
Turn
the
ignition
on
.

If
the
gauge
needle
moves
upward,
the
sender
is
faulty
.
If
the

gauge
does
not
respond,
the
wiring
to
the
gauge
is
broken
(open
circuit)
or
the
gauge
itselfis
faulty
.

WARNING
-

1996
and
laten
models
are
OBD
11
compliant
.
Dis-
connecting
electrical
connectors
wíth
the
ignition
turned
on
may
set
fault
codes
in
the
ECM
.
It
is
rec-
ommended
that
you
leave
the
diagnosis
of
faults
in
the
coolant
temperature
sensorsystem
to
the
BMW
dealer
service
department
which
has
specialized
OBD
11
scan
tool
equipment
.

If
the
gauge
needle
reads
too
high
when
the
engine
is
cold,
remove
the
harness
connector
from
the
sender
.
Turn
the
igni-

tion
on
.
lf
the
gauge
needle
position
does
not
change,
the
wir-

ing
or
the
gauge
is
shorted
to
ground
.
If
the
gauge
needle

drops,
the
sender
is
faulty
and
should
be
replaced
.
When
re-

placing
a
faulty
coolant
temperature
sender,
the
gasket
ring
on
the
sender
should
also
be
replaced
.

Tightening
Torque

"
Temperature
gauge
sender
to
engine
18
Nm
(13
ft-Ib)

Cooling
fan,
testing

NOTE-

OnM44
engines
with
manual
transmission,
the
primary
electric
cooling
fan
is
mounted
on
the
engine
side
of
the
radiator
and
is
controlled
by
the
engine
control
module
(ECM)
.
Troubleshooting
thiscircuit
should
be
left
to
an
authorized
BMW
dealer
with
the
proper
diagnostic
equipment

An
otherwise
sound
cooling
system
may
still
overheat,
par-
ticularly
with
prolonged
idling,
due
to
a
failure
of
the
coolíng

fan(s)
.

The
belt-driven
cooling
fan
is
controlled
by
a
temperature
dependent
viscous
clutch
.
A
failed
fan
clutch
may
affect
air
flow
through
the
radiator
resulting
in
overheating
orpossibly
overcooling
.
Speed

Low
sp
High
s

With
the
engine
off,
check
thefan
clutch
by
spinning
thefan
.



eed
The
fan
should
spin
on
the
clutch
with
some
resistance
.



peed
Check
for
signs
of
leaking
fluid
from
the
clutch
.
If
thefan
free-
wheels
with
no
resistance,
cannot
be
tu
rned
by
hand,
or
there
are
signs
of
oil
leakage,
the
clutch
should
be
replaced
.

TROUBLESHOOTING

Fig
.
3
.



Radiatorcooling
fan
temperature
switch
(arrow)
.

WARNING
-

"
Use
caution
when
testing
the
electric
cooling
fan(s)
and
coolant
temperature
switch
.
Keep
hands
and
wires
clear
of
thefan
blades
.
The
cool-
ing
fan(s)
can
run
any
time
the
ignition
is
ON
.

"
For
greatest
safety,
coolíng
fan
and
coolant
tem-perature
switch
tests
shouldbe
performed
on
acoldengine
with
the
air
conditioning
off
.

Table
b
.
Auxiliary
Cooling
Fan
Switching

Temperatures

Switching
temperature
196°F(91°C)
210°F(99°C)

0012506

If
a
faulty
thermostat,
trapped
air,
or
a
restriction
in
the
sys-
tem
is
not
allowing
the
coolant
to
circulate
through
the
radia-
tor,
the
temperature
switch
will
not
close
and
the
auxiliary
cooling
fan
will
not
run
.
Before
making
the
tests
described
be-
low,
make
sure
the
thermostat
is
operating
correctly
as
de-
scribed
earlier
.
The
normal
switching
temperatures
for
the

dual
-speed
switch
are
listed
in
Table
b
.

170-8



RADIATOR
AND
COOLING
SYSTEM

Electric
cooling
fan,
replacing

On
late
4-cylinder
models
(M44
engine)
with
manual
trans-
mission,
the
primary
cooling
fan
is
electrically
operated
and
is
mounted
on
the
engine
side
of
the
radiator
.

1
.
If
necessary,
remove
cover
from
top
of
radiator
.
See
Fig
.
10
.

0012505
Fig
.
10
.
Air
cover
in
back
of
radiator
.
Unclip
cover
from
fan
shroud
af-
ter
removing
mounting
screws
.

2
.
Disconnect
fan
harness
connector
at
bottom
left
of
ra-
diator
.

3
.
Remove
fan
shroud
mountingscrews
at
left
and
right
side
of
radiator
.
Lift
fan
assembly
straight
up
and
offra-
diator
.

4
.
Installation
is
reverse
of
removal
.
Be
sure
to
align
side
tabs
on
fan
housíng
with
retaining
tabs
on
radiator
when
reinstalling
fan
.

Auxiliary
cooling
fan,
replacing

The
auxiliary
electric
cooling
fan
is
mounted
behind
the
front
bumper,
in
front
of
the
A/C
condenser
.
There
aretwo
ver-
sions
of
auxiliary
fans
installed,
depending
on
model
and
en-
gine
installed
.

TType
1
(u
p
to
9192)

1
.
Remove
front
radiator
air
shroud
.
See
Fig
.
11
.

2
.
Remove
fan
mountingscrews
.
See
Fig
.
12
.

3
.
Tilt
fan
forward
.
Disconnect
electrical
harness
connec-
tor
before
lifting
fan
up
.

COOLING
SYSTEM
SERVICE

Fig
.
11
.
Front
radiator
air
shroud
fasteners
(arrows)
.

Fig
.
12
.
Version
1
auxiliary
fan
mountingscrews
(arrows)
.

NOTE
-

If
necessary,
remove
front
bumper
or
lowerengine
cov-
erto
access
electrical
harnessconnector
.

4
.
Installation
is
reverse
of
removal
.

l)
Type
2
(from
9192)
2
.
Remove
fan
mounting
screws
.
See
Fig
.
13
.

0013137

1.
Remove
front
bumper
and
radiator
grilles
.
See
510
Ex-
terior
Trim,
Bumpers
.

3
.
Angle
fan
up
and
forward,
disconnecting
electrical
har-
nessconnectorbehind
it
.
Remove
it
through
bumper
opening
.

230-
6



MANUAL
TRANSMISSION

Transmission,
removing
and
installing

1
.
Disconnect
negative
(-)
cable
from
battery
.

CAUTION-

Prior
to
disconnecting
the
battery,
read
the
battery
disconnection
cautions
given
at
the
front
of
this
manual
onpage
viii
.

2
.
Insta¡¡
enginesupportacrossengine
bay
.
Raise
engine

so
that
weight
of
engine
ís
supported
.
See
Fig
.
10
.

Fig
.
10
.
Engine
support
equipment
used
to
support
engine
from
above
before
removing
transmission
.

3
.
Raise
vehicle
to
gain
access
to
underside
of
car
.

4
.
Support
transmission
with
transmission
jack
.
lf
applica-
ble,
remove
reinforcing
cross
brace
from
belowen-
gine/transmission
.

5
.
Disconnect
harnesscon
nector
from
reverse
light
switch
on
transmission
.

6
.
Remove
completeexhaustsystem
and
heat
shield
.
See
180
Exhaust
System
.

NOTE-

Disconnect
oxygensensor
hamess
connector(s)be-
fore
lowering
exhaust
system
.

7
.
Remove
driveshaft
.
See260
Driveshaft
.

8
.
Disconnect
shift
rod
from
transmission
selectorshaft
.
See
Fig
.
11
.

9
.
Disconnect
shift
console
fromtop
of
transmission
.
See
250
Gearshift
Linkage
.

TRANSMISSION
REMOVAL
AND
INSTALLATION

Washers

Shift



Shift
rod

rod



retaining
clip

0
0
,

Fig
.
11
.
Shift
lever
to
transmission
connection
.

Shift
console

0012024

10
.
Unbolt
clutch
slave
cylinder
from
sideof
transmission
.

Do
not
disconnect
fluid
hose
.
Suspend
slavecylinder

from
chassis
using
stiff
wire
.

CAUTION-

Do
not
operate
clutch
pedal
with
slave
cylinder
re-
moved
from
transmission
.

11
.
Support
transmission
from
below
with
jack
.
Remove
rear

support
crossmember
from
transmission
.
See
Fig
.
12
.

Fig
.
12
.
Rear
transmission
crossmember
(arrow)
.

12
.
Lower
transmission/engine
assembly
until
it
rests
on
front
suspension
crossmember
.

CAUTION-

Tilting
the
engine
to
lower
thetransmission
can
lead
to
damage
to
various
componente
due
to
lackof
clearance
at
rear
of
engine
-On
cars
with
AST
remove
throttle
body
before
tilt-
ing
engine
.
-Remove
brace
fluid
reservoir
if
necessary
.

0013135

240-
4



AUTOMATIC
TRANSMISSION

TRANSMISSION
REMOVALAND

INSTALLATION

Removal
and
installation
of
thetransmission
is
best
accom-

plished
on
a
lift
using
a
transmission
jack
.
Use
caution
and

safe
workshop
practices
when
working
beneath
car
and
low-

ering
transmission
.

WARNING
-

To
lift
the
vehicle
safely,
see010
Fundamentals
for
the
Do-it-Yourself
Owner
.

CAUTION-

"
Be
sure
the
vehicle
is
properly
supported
.
The
removal
of
the
transmission
may
upset
the
bal-
ance
of
the
vehicle
on
a
lift
.

"
Tilting
the
engine
to
remove
the
transmission
can
lead
to
damage
to
various
components
due
to

lack
of
clearance
.
-On
carswith
AST
remove
throttle
body
.
-Remove
brake
fluid
reservoir
if
necessary
.

Torx-head
bolts
are
used
to
mount
thetransmission
to
the

bellhousing
.
Be
sure
to
have
appropriate
tools
on
hand
before

starting
thejob
.

2
.
Install
engine
support
across
engine
bay
.
Raise
and

safely
support
vehicle
.
See
Fig
.
6
.

WARNING
-
"
When
raising
thecar
using
a
floor
jack
or
a
hy-
draulic
lift,
carefully
position
the
jack
pad
to
pre-
vent
damaging
the
car
body
.
A
suitable
liner
(wood,
rubber,
etc
.)
should
be
placed
between
the
jack
and
the
car
to
prevent
body
damage
.

"
Watch
the
jack
closely
.
Make
sure
it
stays
stable
and
does
not
shift
or
tilt
.
As
the
car
is
raised,
the
car
may
roll
slightty
and
the
jack
may
shift
.

CAUTION-

Removal
of
transmission
will
cause
engine
to
tip
unlessengine
support
is
used
.

TRANSMISSION
REMOVAL
AND
INSTALLATION

Fig
.
6
.
Engine
support
equipment
used
to
support
engine
from
above

before
removing
transmission
.

3
.
Raise
vehicle
to
gain
access
to
underside
of
car
.

4
.
Drain
ATF
from
transmission
as
described
earlier
.

5
.
Disconnect
oxygen
sensor
harness
.
Remove
exhaust

system,
and
exhaust
heat
shield
.
See
180
Exhaust

System
.

Transmission,
removing
and
installing



6
.
Remove
driveshaft
.
See
260
Driveshaft
.

1
.
Disconnect
negative
(-)
cable
from
battery
.



7
.
With
selector
lever
in
Park,
disconnect
shift
selector
le-

ver
cable
from
lever
and
remove
cable
bracket
.
Hold

CA
UTION-



linkage
clamping
bolt
stationary
when
loosening

Prior
to
disconnectiog
the
battery,
read
the
battery



clamping
nut
.
See
Fig
.
7
.

disconnection
cautions
given
at
the
front
of
this
manual
on
page
vi¡¡
.

Fig
.
7
.



Selector
lever
cable
clamping
nut
(A)
.
Loosen
cable
clamping
nut
(B)
and
remove
cable
from
bracket
.
Always
counterholdclamping
bolt
when
loosening
nut
.

8
.
Disconnect
main
harness
connector
from
transmission

by
turning
its
bayonet
lock
ring
counterclockwise
.
Re-

move
wiring
harness
from
transmission
housing
.
See
Fig
.
8
.

Fig
.
8
.



Harness
connector
at
automatic
transmission
.

9
.
Where
applicable,
disconnect
harness
connector
from

speed
sensor
at
top
óf
transmission
.

10
.
Disconnect
transmission
cooler
line
clamps
from
en-

gine
.
Disconnect
lines
from
transmission
.

11
.
Support
transmission
with
transmission
jack
.
Remove

reinforcing
cross
brace
(if
applicable)
and
transmission

support
crossmember
.

NOTE-

Note
installation
positionof
support
crossmember
.

12
.
Remove
access
plug
in
cover
plate
on
right
side
of
en-

gine
block
and
remove
torqueconverter
bolts
.
Turn

crankshaft
to
access
boits
.
See
Fig
.
9
.

AUTOMATIC
TRANSMISSION



240-
5

Bellhousing
access
hole

Socket
wrench

Fig
.
9
.



Access
andremove
torque
converter
boits
through
hole
in
bellhousing
cover
.

0

A

fij
13
.
Remove
bellhousing-to-engine
mounting
bolts
.
See



Fig
.
10
.
Transmission-to-engine
Torx-head
mounting
bolts
.
Fig
.
10
.

0012592

TRANSMISSION
REMOVAL
AND
INSTALLATION

2
.
Install
rubber
grommet
with
arrow
pointing
forward
.
In-



AUTOMATic
TRANSMISSION
stall
shift
rod
and
shift
boot
.



GEARSHIFT

NOTE-

Install
rubbergrommet
correctly
so
that
is
seals
outwa-
ter
.

4
.
Install
driveshaft
and
heat
shield
.
See
260
Driveshaft
.

Manual
valveleven
(at
transmission)

Fig
.
6
.



Automatic
transmission
gearshift
assembfy
.

Shift
cable

GEARSHIFT
LINKAGE



250-
3

The
automatic
transmission
shift
mechanism
is
shown
in
Fig
.
6
.
Use
the
illustration
as
a
guide
when
servícing
the
gear-
shift
mechanism,
including
shift
cable
replacement
.

3
.
Connect
shift
rod
to
shift
lever
.
Install
transmission

crossmember
.
Lift
transmission
and
tighten
crossmem-



Gearshift
mechanism,
adjusting
ber
bolts
.



(automatictransmission)

NOTE-



1
.
Position
selector
lever
in
Park
.

Beforeconnecting
the
shift
rod
to
the
lever,
be
sure
the



2
.
Raise
vehicle
to
gain
access
to
shift
linkage
.
gearshift
leven
is
facing
the
correct
way
as
illustrated
in
Fig
.
1
.
WARNING
-

Make
sure
thecan
is
stable
and
well
supported
at
all
times
.
Use
a
professional
automotive
lift
or
jack
stands
designed
for
the
purpose
.
5
.
Reinstall
exhaust
system
.
See
180
Exhaust
System
.
Connect
oxygen
sensor
harness
connectors
.



3
.
Loosen
selector
cable
clamping
nut
.
See
Fig
.
7
.

6
.
Lower
vehicle
.
Insta¡¡
shift
boot
cover
.
Push
shift
knob



4
.
Push
shift
lever
forwardtoward
engine(Park
position)
onto
lever
.



while
applying
light
pressure
on
cable
end
.
Tighten
ca-
ble
clamping
nut
.

Tightening
Torques



NOTE-
"
Driveshaft
to
final
drive



Do
not
overtighten
the
nut
so
that
it
twists
the
cable
.
flange
(with
U-joint)
.
..
.
.....
.
.
See
250
Driveshaft

"
Flex-disc
to
driveshaft
or

transmission
flange
...
.
.......
See
250
Driveshaft



Tightening
Torque
"
Transmission
crossmember



"
Shift
cable
clamping
nut
.......
10-12
Nm
(75-9
ft-Ib)
to
body
(M8)
.
.
.
...
..............
21
Nm
(16
ft-Ib)

/S
r\
1
1

Gear
position/
neutral
safetyswitch

Automatic
shilo
solenoid
id

AUTOMATIC
TRANSMISSION
GEARSHIFT

ENGINE
HOOD

Hood,
raising
to
service
position

CA
UTION-

Do
not
switch
on
the
windshield
wipers
wlth
the
engine
hood
raised
.
As
a
precaution,
remove
the
wiper
motor
fuse
.
See
610
Electrical
Compo-
nent
Locations
.

1
.
4-door
models
:
Open
hood
fully
.
Remove
bolt
from

hood
hinge
behind
hood
supports
(left
and
right)
.
Raise
hood
to
service
position
.
See
Fig
.
5
.

2
.
2-door
models
:
Open
hood
fully
.

Fig
.
5
.



Hood
support
bracket
boltto
be
removed
(A)
on
4-door
cars
.

Remove
bolts
at
left
and
right
hinges
.
Swing
bracket
in
direc-
tion
of
arrow
to
raise
hood
into
service
position
.

"
Remove
ground
cable
atright
hood
hinge
.

"
Whilean
assistant
supports
hood,
detach
both
hood

supportsfrom
hood
.

"
Remove
detent
screws
at
back
of
hood
hinges
.
See

Fig
.
6
.
"
Lift
hood
while
pulling
hinge
forward
.
Support
hood
at

higher
position
.

3
.
When
service
work
is
complete,
return
hood
to
lower

position
and
instaf
screws
or
bolts
.

FENDERS,
ENGINE
HOOD



410-
3

Fig
.
6
.



Torx
screw
at
base
of
hood
hinge
(arrow)
.

Hood,
removing
and
installing

0013147

1
.
Raise
hood
.
Where
applicable,
partially
remove
hood

acoustic
insulation
to
access
rear
of
hood
.
See
Fig
.
7
.

Fig
.
7
.



Hood
insulation
retainer
being
pried
out

3
.
Detachgas-charged
hood
supportsfrom
hood
.

CAUTION
-

The
hood
is
heavy
.
Before
removing
the
hood
sup-
ports
or
hood
retainingbolts,
be
sure
to
have
an
assistant
help
support
the
hood
.

0013148

2
.
Disconnect
washer
fluid
hoses
from
washer
nozzles
.

Where
applicable,
disconnect
electrical
harness
con-

nectors
fromheated
nozzles
.

ENGINE
HOOD

600
Electrical
System-General

GENERAL
.
...........
.
.
.
.
.
.
.
.
.
...
.
...
600-1

Voltage
and
Polarity
........
.
.
.
.
.
.
.
.....
600-1

Ming,
Fuses
and
Relays
............
.
.
.
.
600-1

Electrical
System
Safety
Precautions
...
.
.
.
.
600-1

Electrical
Test
Equipment
.....
.
.
.
....
.
.
.
.
600-2

WIRING
DIAGRAMS
..
.
.
.
.
.
.
.
.
.
........
600-2

Ming
Codes
and
Abbreviations
..
.
...
.
....
600-2

ELECTRICAL
TROUBLESHOOTING
..
.
..
600-3

Voltage
and
Voltage
Drops
..........
.
.
.
.
.
600-4

GENERAL



Electrical
System
Safety
Precautions

A
brief
description
of
the
principal
parts
of
the
electrical
sys-
tem
is
presented
here
.
Also
covered
here
are
basic
electrical
system
troubleshooting
tips
.

Voltage
and
Polarity

The
vehicle
electrical
system
is
a
12-volt
direct
current
(DC)
negative-ground
system
.
A
voltage
regulator
controls
system
voltage
at
approximately
the
12-volt
rating
of
the
battery
.
Al¡
circuits
are
grounded
by
direct
or
indirect
connection
to
the

negative
(-)
terminal
of
the
battery
.
A
number
of
ground
con-

nections
throughout
the
car
connect
the
wiring
harness
to

chassis
ground
.
These
circuits
are
completedby
the
battery

cable
or
ground
strap
between
the
body
and
the
battery
nega-

tive
(-)
terminal
.

Wiring,
Fuses
and
Relays

Nearly
all
parts
of
the
wiring
harnessconnect
to
compo-

nents
of
the
electrical
system
with
keyed,
push-on
connectors

that
lock
into
place
.
Notable
exceptions
arethe
heavy
battery

cables
and
the
starter
wiring
.
The
wiring
is
color-coded
for
cir-

cuitidentification
.

With
theexception
of
the
battery
charging
system,
most

electrical
power
is
routed
from
the
ignition
switch
or
the
bat-
tery
through
the
main
fuse/relay
panel,
located
in
¡he
left
rear

comer
of
the
engine
compartment
.
Fuses
are
color
coded
to

indicate
current
capacities
.

The
relays
and
control
units/modules
are
mounted
in
vari-

ous
places
throughout
the
vehicle
.
See610
Electrical
Com-

ponent
Locations
.

ELECTRICAL
SYSTEM-GENERAL
600-1

Voltage,
measuring
.
.
.
................
.
.
600-4

Voltage
drop,
testing
.
.
.....
.
.....
.
......
600-4

Continuity,
checking
..
.
...
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
600-5
Short
Circuits
.
.
.
.
.
.
.
.
.....
.
...
.
.
.
.
.
.
.
.
.
600-5

Short
circuit,
testing
with
ohmmete'r
.
.
.
.
.
.
.
.
.
600-6

Short
circuit,
testing
with
voitmeter
.
.
.
.
.
.
.
.
.
600-6

TABLES
a
.
Terminal
and
Circuit
Numbers
..............
..
.600-3
Please
read
the
following
warnings
and
cautions
before
do-
ing
any
work
on
your
electrical
system
.

WARNING
-

"
The
cars
covered
by
this
manual
are
equipped
with
aSupplemental
Restraint
System
(SRS)
that
automatically
deploys
one
or
more
airbags
.
Each
airbag
unit
houses
an
explosive
powerful
charge
.
Any
work
involving
the
SRS
system
should
only
be
performed
byan
authorized
BMW
dealer
.
Making
repairs
without
the
proper
knowledge
and
special
test
equipment
may
cause
serious
per-
sonal
injury
.
See
721
Airbag
System
(SRS)
.

"
The
ignition
system
of
the
car
operates
at
lethal
voltages
.
People
with
pacemakers
or
weak
hearts
should
not
expose
themselves
to
the
ignition
sys-
tem
.
Extra
caution
mustbe
taken
when
working
on
the
ignition
system
or
when
servicing
theen-
gine
while
it
is
runningor
the
key
is
on
.
See
120
Ignition
System
for
additional
ignition
system
warnings
and
cautions
.

"
Before
operating
the
starter
without
starting
the
engine
(as
when
making
a
compressfon
test),
dis-
able
the
ignition
system
as
described
in
120
Igni-
tion
System
.

"
Keep
hands,
clothing
and
other
objects
clear
of
the
electric
radiator
coollng
fan
when
working
on
a
warm
engine
.
The
fan
may
start
at
any
tíme,
even
when
the
ignition
is
switched
off
.

GENERAL

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
.

610-4



ELECTRICAL
COMPONENT
LOCATIONS

--J
L
Windshield
washertank
&
pump

Fig
.
7
.



E36
engine
compartment
layout
.
M42
engine
compartment
shown
.

-,x
0013204

Fig
.
8
.
Control
modules
under
right
sideof
dash
.
Glove
compart-
ment
has
been
removed
.
For
module
identification,
see
Fig
.
9
.

COMPONENT
LOCATIONS

RSP
'I



4

ABS



Main
engine



Power
hydraulic
harness
distribution
control
unit



connector
I



box
oe

1
.
SRS
(Airbag)
control
module
(through
1993)
2
.
ABS/ASC+T
control
module
(as
applicable)
3
.
Central
locking
module
(through
1993)
4
.
Anti-theft
alarm
module
or
ZKE
IV
control
module
(from
1994)5
.
Rear
window
blower
relay
(convertible
models)6
.
Horn
relay
7
.
Wiper/washer
module
8
.
Rear
power
window
relay
(four-door
models)9
.
Luggage
compartment
lid
lock
relay
(convertible)
10
.
Cruise
control
module
EWS
II
control
module
(from
Jan
.
1995)
RSP
:
Right
splice
panel

0013215

Fig
.
9
.



Identificationof
control
modules
under
right
side
of
dash
.
Module
utilízation
varies
byyear
andmodel