airbag BMW 318i 1997 E36 Owner's Manual
[x] Cancel search | Manufacturer: BMW, Model Year: 1997, Model line: 318i, Model: BMW 318i 1997 E36Pages: 759
Page 338 of 759
512-
8
DOOR
WINDOWS
NOTE-
To
achieve
an
accurate
window
adjustment
in
2-door
models
with
"close
with
door
shut"
feature,
simulate
a
closed
dooras
follows
:
On
early
cars,
manually
turn
the
latch
on
the
door
to
the
closed
position
.
See
Fig
.
16
.
On
latercars,
insert
a
wedge
of
wood
into
the
striker
on
the
body
to
close
the
striker
switch
.
Be
sure
to
open
thero-
tary
latch
(by
pulling
upon
the
door
handle)
or
remove
the
wedge
before
closing
the
door
.
0013066
Fig
.
16
.
To
manually
close
door
latch,
push
rotary
latch
in
direction
of
arrow
.
CAUTION-
Do
not
close
the
door
with
therotary
latch
in
closed
position,
orwith
a
wedge
in
the
striker
.
WINDOW
SERVICE,
2-DOOR
MODELS
A
Window
insertion
depth
at
A-pillar
B
B-pillar
preload
gap
(measure
gap
at
20
mm
from
top
of
door)
C
Window
insertion
depth
at
roof
line/window
parallelism
(make
measurement
at
3
.5
in
.
and
16
in
.
from
B-pillar
edge)
Fig
.
17
.
2-door
window
adjustment
positions
.
NOTE-
In"
some
models
covered
inthis
manual,
it
is
not
es-
sential
to
remove
the
side-impact
airbag
to
access
in-
terna¡
door
components
.
However,
the
procedure
is
recommended
for
safety
reasons
.
"
After
each
adjustment
step,
fully
lower
and
raise
win-
dow
and
check
adjustment
before
goingon
to
the
next
step
.
"
1f
parts
of
the
front
window
mechanism
were
replaced,
make
sure
initial
adjustments
are
in
the
center
of
their
travel
range
.
Once
the
glass
isinstalled,
position
glass
to
the
rear
guide
rail
as
shown
in
Fig
.
18
.
4
.
To
set
window
preload
B
(See
Fig
.
1
g
.):
0013076
When
making
adjustments
to
the
front
door
window,
see
"
Measure
up
20
mm
(0
.75
in
.)
from
topof
door
and
Fig
.
17
.
mark
position
on
glass
.
"
Close
door
just
until
top
of
glass
contacts
seal
.
1
.
On
cars
with
side-impact
airbags,
disconnect
negative
"
Measure
gap
between
glass
(at
20
mm
mark)
and
win-
(-)
cable
from
battery
.
dow
seal
.
"
If
adjustment
is
necessary,
move
bottom
of
window
CAUTION-
guide
inor
out
to
correct
.
See
Fig
.
20
.
Prior
to
disconnecting
the
battery,
read
the
battery
"
If
further
adjustment
is
needed,
move
bottom
ofwin-
disconnection
cautionsgiven
at
the
front
of
this
dow
in
or
out
by
sliding
guide
bracket
.
Refer
to
Fig
.
18
.
manual
on
page
viii
.
2
.
Remove
interior
door
panel
and
vapor
barrier
.
See
411
Preload
Gap
Doors
.
"
B
(Referto
Fig
.
1
g
.)
Coupe
......................
.
.
.8
mm
(0
.32
in
.)
3
.
Where
applicable,
remove
side-impact
airbag
from
Convertible
..................
.
..
3
mm
(0
.12
in
.)
door
.
See
721
Airbag
System
(SRS)
.
Page 340 of 759
512-
1
0
DOOR
WINDOWS
0013078
Fig
.
22
.
Move
window
fore/aftatrear
guide
rail
top
mounting
bolts
(ar-
rows)
.
Insertion
Depth
"
A
(See
Fig
.
17
.)
.
..........
.1-1
.5
mm
(0
.04-0
.6
in
.)
6
.
To
set
Insertion
depth
C
(Refer
to
Fig
.
17
.)
:
"
Lower
window
slightly
.
Loosen
stop
at
window
regula-
tor
motor
.
See
Fig
.
23
.
Fig
.
23
.
Window
regulator
stop
(arrow)
.
WINDOW
SERVICE,
2-DOOR
MODELS
0013075
"
Raise
window
.
Loosen
rear
boltat
regulator
support
arm
(5mm
Allen
wrench)
.
See
Fig
.
24
.
Align
window
parallelto
roof
line
by
moving
support
arm
up
or
clown
.
Tighten
arm
bolt
.
"
Lower
window
and
remove
rubber
plugs
at
bottom
of
door
.
If
necessary,temporarily
reconnect
battery
ca-
ble
.
"
Adjust
front
and
rear
limit
stops
so
that
window
retracts
into
window
seal
as
specified
.
See
Fig
.
25
.
"
Raise
window
to
check
adjustment
.
"
Push
regulator
stop
fully
forward
and
tighten
bolt
.
"
Closedoor
and
check
window
operation
.
0013077
Fig
.
24
.
Use
5mm
Afen
socket
to
loosen
mounting
boltat
support
bracket(arrow)
and
slide
bracket
up
or
clown
to
adjust
win-
dow
position
at
roof
line
.
(Allen
bolt
head
faces
outside
of
door
.)
CAUTION
-
"
Recheck
preload
gap
B
(step
4)
.
Excessive
pre-
load
could
cause
window
to
shatter
.
"
The
fully
closed
window
must
not
contact
the
rain
gutter
when
opening
the
door
(in
the
event
the
"close
with
door
shut"
feature
is
faulty
or
the
bat-tery
is
dead)
.
7
.
Usenew
mounting
bolts
when
reinstalling
the
side-im-
pact
airbag
to
the
door
(where
applicable)
.
Reset
SRS
warning
light
and
clear
SRS
fault
memory
using
special
test
equipment
.
See
721
Airbag
System
(SRS)
.
8
.
Replace
door
panel,
rubber
door
plugs
and
outside
doormolding
.
9
.
Re-initialize
window
regulator
motors
as
described
ear-
lier
.
Page 342 of 759
512-
1
2
DOOR
WINDOWS
Fig
.
30
.
Vent
window
mounting
nuts
on
B-pillar
(arrows)
.
WINDOW
REGULATOR
SERVICE
0013071
Fig
.
29
.
Seat
belt
sliding
anchor
mounting
bolts
on
B-pillar
(arrows)
.
Notedoor
post
and
vent
window
trim
strips
peeled
away
.
Tightening
Torques
"
Latch
to
vent
window
(M5
screw)
.....
6
Nm
(53
in-lb)
"
Seat
belt
anchor
nut
..............
31
Nm
(23
ft-Ib)
"
Seat
belt
sliding
anchor
mounting
bolts
.
..
...
.
...........
24
Nm
(17
ft-Ib)
"
Vent
window
to
body(M6
nut)
.....
6
.2
Nm
(55
in-lb)
WINDOW
REGULATOR
SERVICE
Door
window
regulator
and
motor,
removing
and
installing
This
procedure
applies
to
front
or
rear
door
windows
.
1
.
Remove
door
panel
and
vapor
barrier
as
described
in
411
Doors
.
WARNING
-
"
Some
1997
and
all
1998
model
year
cars
are
equipped
with
front
side-impact
airbags
in
the
front
doors
.
Whenever
servicing
the
doors
orwin-
dows
on
cars
with
front
side-impact
airbags,
al-
ways
disconnect
the
negative
(-)
battery
cable
.
See
721
Airbag
System
(SRS)
for
cautions
and
procedures
relating
to
the
airbag
system
.
"
Prior
to
disconnectiog
the
battery,
read
the
bat-tery
disconnection
cautions
gíven
at
the
front
of
this
manual
onpage
vi¡¡
.
2
.
Remove
door
glass
as
described
earlier
in
this
section
.
3
.
Remove
inside
door
handle
.
See
Fig
.
31
.
4
.
Disconnect
wiring
connector
to
power
window
motor
.
5
.
Remove
regulator
mounting
bolts
or
drill
out
rivets
.
See
Fig
.
32
.
0013193
0013072
Fig
.
32
.
Front
window
regulator
mounting
fasteners
(arrows)
.
6
.
Remove
regulator
assembly
fromdoor
.
Page 346 of 759
513-2
INTERIOR
TRim
DASHBOARD
Dashboard
removal
is
a
complex
operation,
involving
dis-
connection
and
dismantling
of
a
number
of
electrical
and
dash
structural
components
.
The
BMW
E36
is
equipped
with
SRS
airbags
mounted
in
the
steering
wheel,
in
the
dashboard
(1994
and
later)
on
the
passenger
side,
and
in
the
front
doors(1997
and
later)
.
Air-
bags
units
are
pyrotechnic
devices
and
should
be
treated
with
extreme
caution
.
Improper
handling
of
the
airbags
could
cause
serious
injury
.
WARNING
-
"
The
BMW
Supplemental
Restraint
System
(SRS)
is
complex
and
special
precautions
must
be
ob-
served
when
servicing
.
Serious
injury
may
result
if
system
service
is
attempted
by
persons
unfa-
miliar
with
the
BMW
SRS
and
its
approved
ser-vice
procedures
.
BMW
specifies
that
all
inspection
and
service
shouldbe
performed
byan
authorized
BMW
dealer
.
"
Beforeperforming
any
work
involving
the
steering
wheel
or
interior
trim
in
the
vicinity
of
the
airbags,
disconnect
the
negative
()
battery
cable
.
See
721
Airbag
System
(SRS)
.
"
SRS
contains
aback-up
power
supply
within
the
SRS
control
module
.
A
10
minute
díscharge
peri-
od
should
be
allowed
after
the
battery
cable
has
been
disconnected
.
Glove
compartment,
removing
and
installing
1.
Open
glove
compartment
door
.
2
.
Remove
glove
compartment
mounting
screws
.
See
Fig
.
2
.
3
.
Pull
glove
compartment
out,
disconnecting
electrical
harness
connectors
as
necessary
.
4
.
Installation
is
reverse
of
removal
.
DASH80ARD
Fig
.
2
.
Glove
compartment
mounting
screws
(arrows)
.
Lower
left
dash
panel,
removing
and
installing
0013107
1
.
Remove
lower
dash
panel
retaining
screws
.
See
Fig
.
3
.
0013155
Fig
.
3
.
Lower
left
dash
panel
retaining
screws
(arrows)
.
2
.
Pull
lower
dash
panel
left
and
back
to
disengagefrom
driver's
footwell
retaining
clips
.
3
.
Installation
is
reverse
of
removal
.
Page 347 of 759
Dashboard,
removing
and
installing
1
.
Disconnect
negative
(-)
cable
from
battery
and
cover
terminal
with
insulating
material
.
CAUTION-
Prior
to
disconnectiog
the
battery,
read
the
battery
disconnection
cautionsgiven
at
the
front
of
this
manual
onpage
vi¡¡
.
2
.
Remove
center
console
as
described
earlier
.
3
.
Remove
glove
compartment
as
described
earlier
.
4
.
Remove
lower
left
dash
trim
piece
as
described
above
.
Remove
lower
right
dash
trim
panel
.
See
Fig
.
4
.
Fig
.
4
.
Lower
right
dash
trim
piece
retaining
screw
(arrow)
.
WARNING
-
Store
the
removed
airbags
in
a
safe
place
.
Position
the
airbags
facing
up
.
8
.
Remove
instrument
cluster
.
See
620
Instruments
.
5
.
Remove
driver
and
passenger
airbags
.
See
721
Air-
bag
System
(SRS)
.
6
.
Remove
steering
wheel
.
See
320
Steering
and
Wheel
Alignment
.
INTERIOR
TRIM
513-
3
Fig
.
5
.
Driver
side
knee
bolster
mounting
bolts
(arrows)
.
9
.
Remove
headlight
switch
.
Remove
turn
signal
and
windshield
wiper/washer
stalk
switches
.
See612
Switches
and
Electrical
Accessories
.
10
.
Remove
A/C
control
head
and
module
.
See
640
Heat-ing
and
Air
Conditioning
.
11
.
Remove
radio
.
See650
Radio
.
12
.
Remove
A-pillar
(windshield
pillar)
trim
on
left
and
right
sides
.
See
Fig
.
6
.
UU13156
Fig
.
6
.
A-pillar
(windshield
pillar)
trim
removal
.
Right
side
shown,
left
7
.
Remove
driver
side
knee
bolster
.
See
Fig
.
5
.
is
similar
.
DASHBOARD
Page 349 of 759
515
Central
Locking
and
Anti-Theft
GENERAL
.....
.
.
.
.
.
.
.
..:
.
.
.
......
.
.
.
.
515-1
Luggage
compartment
locking
actuator,
removing
and
installing
.
.
.
.
.
...........
.
515-6
DOOR
HANDLES
AND
LOCKS
.........
515-1
LOCKING
SYSTEM
AND
Front
door
lock,
removing
and
installing
....
.515-1
ELECTRONIC
IMMOBILIZATION
......
.515-7
Front
door
handle,
removing
and
installing
...
515-3
Rear
door
lock,
removing
and
installing
.....
515-4
Central
Locking
System(ZVM)
.
.
.
.
.......
.
515-7
Rear
door
handle,
removing
and
installing
...
515-5
Central
Body
Electronics
(ZKE
IV)
.
.
.......
.515-8
Electronic
Immobilization
System
(EWS)
.
.
.
.
.515-8
Door
striker,
rep
lacing
.
.
.
.
.
.
.
.
.
..........
515-6
EWS
II
control
module,
re
lacin
515-10
LOCKING
ACTUATORS
.
.
.
.
.
.
..........
515-6
Ring
antenna,
replacing
.
.
.
.
.
.
.
.
.
.
...
.
.
.
.
515-10
Door
Locking
Actuator
.
.
.
.
.
.
.
.
..........
515-6
EWS
II
transmitter/receiver
module,
replacing
...........
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
515-11
GENERAL
This
section
covers
repair
information
for
the
central
locking
and
the
anti-theft
systems
.
Keep
in
mind
that
E36
cars
are
CA
UTION-
equipped
with
sophisticated
and
self-diagnostic
electrical
sys-
Prior
to
disconnecting
the
battery,
read
the
battery
tems
.
When
experiencing
malfunctions
relatinglo
the
central
disconnection
cautions
given
at
the
front
of
this
locking
or
the
anti-theft
system,
it
is
recommended
that
the
manual
onpage
vi¡¡
.
systembe
diagnosed
using
the
BMW
service
tester
(DIS)
.
This
advanced
diagnostic
tool
can
usually
pinpoint
electrical
NOTE-
faults
quickly
and
safely
.
Consult
an
authorized
BMW
dealer
.
In
some
models
covered
inthis
manual,
it
is
not
essen-
tial
to
remove
the
side-impact
airbag
to
access
intemal
NOTE-
door
components
.
However,
the
procedure
is
recom-
Additional
general
electrical
information
can
be
found
mended
for
safely
reasons
.
i
n
610
Electrical
Component
Locations
and
Electri-
cal
Wiring
Diagrams
.
4
.
Disconnect
harnessconnector
from
window
motor
to
DOOR
HANDLES
AND
LOCKS
Front
door
lock,
removing
and
installing
1
.
Remove
front
door
panel
and
vapor
barrier
asde-
scribed
in
411
Doors
.
WARNING
-
Some
1997
and
all
1998
cars
are
fitted
with
side-im-
pact
airbags
in
the
front
doors
.
When
servicing
the
door
locks
on
cars
with
front
side-impact
airbags,
al-
ways
disconnect
the
negative
(-)
battery
terminal
.
See721
Airbag
System
(SRS)
forcautions
andpro-
cedures
relating
to
the
airbag
system
.
2
.
Raise
door
window
completely
CENTRAL
LOCKING
AND
ANTI-THEFT
515-1
3
.
On
cars
with
side-impact
airbags,
disconnect
negative
(-)
cable
from
battery,
then
remove
airbag
module
.
prevent
accidental
operation
.
5
.
On
4-door
cars
:
Peel
back
rubber
window
guide
from
reas
guide
rail
:
Remove
guide
rail
mounting
boltat
bot-
tom
.
Unclip
any
wiring
from
guide
rail
and
pull
guide
rail
downward
and
remove
from
door
.
See
Fig
.
1
.
NOTE
-
The
top
of
the
guide
rail
is
"hooked"
to
the
doorsheet
metal
.
6
.
Remove
inside
door
handle
retaining
screw
.
Discon-
nect
inside
handle
from
linkage
and
remove
.
See
Fig
.
2
.
7
.
Cut
wire
ties
and
remove
door
lock
electrical
harness
con-
nector
.
Remove
door
lock
mounting
screws
.
See
Fig
.
3
.
8
.
Working
inside
door,
disconnect
outside
door
handle
and
lockcylinder
linkage
from
door
lock
.
Remove
lock
from
inside
door
.
See
Fig
.
4
.
DOOR
HANDLES
AND
LOCKS
Page 350 of 759
515-2
CENTRAL
LOCKING
AND
ANTI-THEFT
0013117
Fig
.
1
.
4-door
cars
:
Remove
lower
retaining
boltat
base
of
window
rear
guide
rail
and
pivot
rail
out
of
door
.
Fig
.
3
.
Front
door
lock
mounting
screws
(arrows)
.
uu11686
0012685
Fig
.
4
.
Pry
out
locklinkage
(A)
from
plastic
retainer
.
Lift
door
lock
mechanism
slightly
to
Rmove
latching
pin
from
lock
gate
(B)
.
Door
lock
mechanism
shown
removed
from
door
.
0013073
Fig
.
2
.
Inside
door
handle
retaining
screw
(A)
Unhook
linkage
from
handle
at
B
.
9
.
Installation
is
reverse
of
removal,
noting
the
following
:
DOOR
HANDLES
AND
LOCKS
"
Install
lock
mounting
bolts
with
Loctite
0
270
or
equiva-
lent
thread-locker
.
"
Reconnect
power
window
motor
harness
connector
.
"
Usenew
mounting
bolts
when
reinstalling
the
side-ím-
pact
airbag
to
the
door
(where
applicable)
.
"
Secure
wire
harnesses
with
wire
ties
.
"
Check
function
of
door
lock
and
window
mechanism
before
reinstalling
inner
door
panel
.
Tightening
Torques
"
Door
lock
to
door
......
.
..........
9
Nm
(80
in-lb)
"
Window
guide
to
door
........
.
...
10
Nm
(89
in-lb)
Page 351 of 759
Front
door
handle,
removing
and
installing
1
.
Closedoor
window
completely
.
2
.
Remove
front
door
panel
and
vapor
barrier
asde-
scribed
in
411
Doors
.
WARNING
-
Some
1997
and
al]
1998
cars
are
fitted
with
side-im-
pact
airbags
in
the
front
doors
.
When
servicing
the
door
handles
on
cars
with
front
side-impact
airbags,
always
disconnect
the
negative
(-)
battery
terminal
.
See
721
Airbag
System
(SRS)
for
cautions
and
pro-
cedures
relatíng
to
the
airbag
system
.
3
.
On
carswíth
side-impact
airbags,
disconnect
negative
(-)
cable
from
battery,
then
remove
airbag
module
.
CAUTION-
Prior
to
disconnecting
the
battery,
read
the
battery
disconnection
cautions
given
at
the
front
of
thís
manual
onpage
vi¡¡
.
NOTE-
In
some
models
covered
inthis
manual,
it
is
not
essen-
tial
to
remove
the
side-impact
airbag
to
access
internal
door
components
.
However,
the
procedure
is
recom-
mended
for
safety
reasons
.
4
.
Remove
door
lock
as
described
earlier
.
5
.
Remove
window
as
described
in
512
Door
Windows
.
CA
UTION-
On
models
with
side-impact
airbags,
removinglin-
stalling
the
front
window
requires
that
the
battery
cable
bereconnected
wíth
the
side-impact
airbag
disconnected
.
This
will
seta
fault
code
in
the
SRS
control
module,
turn
on
the
SRS
warning
light,
and
disable
the
SRS
system
until
the
fault
memo-
ry
is
cleared
usíng
special
SRS
test
equipment
.
6
.
Pry
out
access
plug
in
end
of
door
.
Use
screwdriver
through
access
hole
to
slide
exteriortrim
locking
plate
into
released
position
.
See
Fig
.
5
.
Remove
doorhandle
exterior
trim
piece
.
7
.
Working
inside
door,
remove
locking
clip
for
doorhan-
dle
retaining
pin
and
push
pin
out
.
8
.
Working
inside
door,
disconnect
electrical
harness
con-
nector
at
door
handle
.
Twist
plastic
connector
bracket
to
remove
from
door
handle
.
CENTRAL
LOCKING
AND
ANTI-THEFT
515-
3
0011681
Fig
.
5
.
Insert
screwdriver
into
access
hole
and
push
lockingplate
forward
(arrow)
to
release
exterior
handle
trim
.
uu11682
Fig
.
6
.
Door
handle
retaining
pin(A)
and
lock
collar
nut
(B)
.
Door
handle
trim
shown
removed
.
10
.
Remove
door
handle
fromdoor
by
angling
out
of
door
cavity
.
Removed
door
handle
assembly
is
shown
in
Fig
.
7
.
0012684
Fig
.
7
.
Door
handle
harnessconnector
(A)
;
retaining
pin
Iocking
clip
9
.
Working
at
door
exterior,
remove
handle
collar
nut
(B)
;
exterior
trim
Iocking
plate
(C)
.
Handleassembly
shown
re-
while
supporting
handle
.
See
Fig
.
6
.
moved
from
door
.
DOOR
HANDLES
AND
LOCKS
Page 352 of 759
515-4
CENTRAL
LOCKING
AND
ANTI-THEFT
11
.
Installation
is
reverse
of
removal
.
Keep
in
mind
the
fol-
4
.
Remove
screws
mounting
bottom
of
window
rear
track
lowing
:
to
door
.
See
Fig
.
9
.
"
Make
sure
rubber
seal
for
handle
is
correctly
posi-
tionedbefore
tightening
mounting
fasteners
.
"
Install
exteriortrim
piece
and
then
use
a
hooked
tool
to
pull
locking
plate
into
locked
position
.
Make
sure
door
handle
trim
contacts
body
evenly
before
locking
trim
in
place
.
"
Use
new
mounting
bolts
when
reinstalling
the
side-im-
pactairbag
to
the
door(where
applicable)
.
Reset
SRS
warning
light
and
clear
SRS
fault
memory
using
spe-
cial
test
equipment
.
See
721
Airbag
System
(SRS)
.
"
Reconnect
al¡
harness
connectors
(including
power
window
motor)before
installing
door
panel
.
"
Secure
wire
harnesses
withwire
ties
.
"
Adjust
and
reinitialize
windows
.
See
512
Door
Win-
dows
.
Tightening
Torque
"
Collar
nut
to
doorhandle
..........
10
Nm
(89
in-lb)
1.
Remove
rear
door
panel
and
vapor
barrier
as
described
in
411
Doors
.
2
.
Remove
window
from
rear
dooras
described
in
512
Door
Windows
.
3
.
Disconnect
andremove
inside
door
handle
.
See
Fig
.
8
.
0013073
Fig
.
8
.
Inside
door
handle
retaining
screw
(A)
Unhook
linkage
from
handle
at
B
.
DOOR
HANDLES
AND
LOCKS
Fig
.
9
.
Rear
window
track
lower
fasteners
(arrows)
.
Reardoor
lock,
removing
and
installing
5
.
Remove
window
rear
track
top
screw
and
move
track
aside
.
See
Fig
.
10
.
Fig
.
10
.
Rear
window
track
top
screw
(arrow)
.
6
.
Remove
screw
from
lock
button
linkage
rod
retainer
.
Lift
rod
out
of
retaining
clip
.
See
Fig
.
11
.
7
.
Disconnect
door
lock
harnessconnector
.
8
.
Remove
door
lock
screws
.
See
Fig
.
12
.
0013085
9
.
Move
lock
upslightly
to
disengage
from
exterior
handle
linkage
.
Remove
lock
from
inside
door
.
Page 381 of 759
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