
721
Airbag
System
(SRS)
Airbag
Systems
.......
.
...
.
.
.
.
.
....
.
.
.
.
721-1
AIRBAG
SENSORS
AND
ELECTRONICS
721-2
SRS
Warning
Light
and
Fault
Display
.
.
.
.
.
..
721-2
Airbagcontact
ring,
replacing
........
.
.
.
.
.
721-3
Airbag
crash
sensor,replacing
..
.
....
.
...
.
721-4
ZAE
control
module,
replacing
.
.
.
.........
721-5
GENERAL
This
repair
group
covers
only
removal
and
installation
of
air-
bag
components
.
Airbag
system
repair
and
fault
diagnosis
is
not
covered
here
.
Diagnostics,
component
testing,
and
airbag
system
repair
should
be
carried
out
by
trained
BMW
service
technicians
.
NOTE-
Special
test
equipment
is
required
to
retrieve
SRS
fault
codes,
diagnose
system
faults,
and
resetltum
off
the
SRS
indicator
light
.
The
SRS
indicator
light
will
remain
on
until
any
problem
has
been
corrected
and
the
fault
memory
has
been
cleared
.
When
servicing
cars
equipped
with
SRS,
the
precautions
on
this
page
mustbeobserved
to
prevent
personal
injury
.
Airbag
Systems
The
airbag
system
installed
on
E36
cars
through
the
1993
model
year
consisted
of
a
single
airbag
in
the
steering
wheel
.
This
systemcan
be
identified
by
the
orange
crash
sensors
lo-
cated
on
the
front
wheel
wells
and
the
absence
of
a
passenger
side
airbag
.
The
ZAE
airbag
system,
starting
in
model
year
1994
(pro-
duction
date9/93
and
later),
provides
both
a
driver
side
and
a
passenger
sideairbag
.
On
ZAE
vehicles,
the
crash
sensorsare
integrated
into
the
airbag
control
module,
located
under
thecenter
of
the
rear
seat
.
The
ZAE
control
module
triggers
deployment
of
the
airbags
When
it
sensos
the
vehicle
deceler-
ating
at
a
rate
equivalent
to
a
head-on
collisionof
at
least
13
mph
(18
km/h)
.
In
some
1997
4-door
models
and
all
1998
models,
side-impact
airbags
were
installed
in
the
front
doors
.
The
airbag
units
are
mounted
behindthe
door
trim
panels
.
Caution
mustbeused
when
working
on
vehicle
systems
in
the
proximity
of
air
bags,
such
as
the
steering
column,
the
dashboard,
or
the
doors
.
AIRBAG
SYSTEM
(SRS)
721-1
GENERAL
.
.
.
.
.
.
.
.
.
.
.......
.
......
.
.
.
.
721-1
Front
side-impact
airbag
crash
sensor,
removing
and
installing
....
.
.....
.
.....
.
721-5
AIRBAGS
..............
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
721-5
Driver
side
airbag,
removing
and
installing
.
.
.
721-5
Passenger
side
airbag,
removing
and
installing
..............
.
.
.721-6
Front
side-impact
airbag,
removing
and
installing
.
.
.
.
.
.
.
.
.
.
......
.721-7
WARNING
-
"
Airbag(s)
are
inflated
byan
explosive
device
.
Handled
improperly
or
without
adequate
safe-
guards,
the
System
can
be
very
dangerous
.
Spe-
cial
precautions
must
be
observed
prior
to
any
work
ator
near
the
driverside
airbag,
the
passen-
ger
side
airbag
(where
applicable)
or
the
side-im-
pact
airbags
(where
applicable)
.
"
The
airbag
is
a
vehicle
safety
system
.
Serious
in-
jury
may
result
if
System
service
is
attempted
by
persons
unfamiliar
with
the
BMW
SRS
and
its
ap-
proved
service
procedures
.
BMW
advises
that
all
inspection
and
service
be
performed
by
an
autho-
rized
BMW
dealer
.
"
Always
disconnect
the
battery
and
cover
the
neg-
ative
()
battery
terminal
with
an
insulator
before
startingdiagnostic,
troubleshooting
or
service
worknot
associated
with
SRS,
and
before
doing
any
welding
on
the
car
.
"
If
an
airbag
has
been
activated
due
to
an
acci-dent,
BMW
specifies
that
SRS
components
be
replaced
.
For
more
information
on
post-collision
SRS
service,
see
an
authorized
BMW
dealer
.
"
Do
not
allow
the
airbag
unit
to
come
in
contact
with
cleaning
solutions
orgrease
.
Never
subject
an
airbag
unit
to
temperatures
aboye
212°F
(100°C)
.
When
reconnecting
the
battery,
no
per-
son
should
be
inside
the
vehicle
.
"
Always
place
an
airbag
unitthat
has
been
re-
moved
from
its
packaging
with
the
padded
sidefacing
upward
.
Do
not
leave
an
airbag
unlt
unat-
tended
.
"
!f
the
airbag
unit
or
airbag
control
modulehas
been
dropped
froma
height
of
!
1
2
meter
(1
Y2
ft.)
ormore,
theairbag
unit
should
not
be
installed
.
Aírbag
system
components
are
shown
in
Fig
.
1.
GENERAL

721-2
AIRBAG
SYSTEM
(SRS)
Fig
.
1
.
Airbag
system
components
.
AIRBAG
SENSORSAND
ELECTRONICS
CA
UTION-
"
If
an
airbag
is
activated,
the
following
compo-
nents
must
be
replaced
:
Airbag
with
contact
ring
;
-Pyrotechnic
seat
belt
tensioners
(if
fitted)
;
-SRS
Control
module
;
-Impact
sensors
;
All
airbags
which
did
not
deploy
.
"
Consult
your
BMW
dealer
for
parts
and
service
information
.
TheE36
airbag
system
consists
of
the
following
compo-
nents
:
crash
sensors
(in
earlycars,
through
1993),
an
elec-
tronic
control/monitoring
module
(with
integrated
crash
sensor
in
ZAE
systems),
an
indicator
light
in
the
instrument
panel,
and
inflatable
airbags
equipped
with
gas
generators
in
the
steering
wheel
and
in
the
passenger
side
of
the
instrument
panel
(ZAE
systems)
.
Some
1997
and
al¡
1998
carsalso
have
side-impact
airbags
in
the
front
doors
.
AIRBAG
SENSORS
AND
ELECTRONICS
1.
Crash
sensors
(through
1993)
wheel
2
.
SRS
control
module
in
front
of
5
.
Side-impact
airbags
(1997/98)
glove
compartment
(through
6
.
ZAE
control
module
under
rear
1993)
seat
(from
1994)
3
.
Passenger
side
airbag
unit
in
7
.
Side-impact
airbag
crash
sensors
dashboard
(ZAE
system)
in
door
silis
(1997/98)
4
.
Driver
side
airbag
unitin
steering
8
.
Knee
bolsters
In
addition
to
the
airbags,
the
vehicles
are
equipped
wíth
knee
bolsters
for
extra
protection
.
SRS
Warning
Light
and
Fault
Display
The
airbag
system
utilizes
a
self-diagnostic
control
module
to
detect
and
store
system
faults
.
If
a
fault
is
detected,
the
SRS
indicator
in
the
instrument
cluster
comes
on
and
stays
on
.
When
the
ignition
key
is
tumed
on,
the
indicator
light
will
illu-
minate
for
approximately
4-6
seconds
.
The
illuminated
light
indicates
the
self-testof
the
electronic
control/monitoring
module,
the
ignítors
and
crash-sensorcircuits,
and
the
system
wiring
.
The
airbag
system
should
be
inspected
byan
autho-
rized
BMW
dealer
if
the
indicator
light
does
not
come
on,
ifit
does
not
go
out
in
approximately
4-6
seconds
after
switching
onthe
ignition,
or
if
the
light
comes
on
during
driving
.
If
the
system
has
detected
a
fault,
the
light
will
come
on
and
stay
on
.

Fig
.
8
.
Airbag
crash
sensor
mountingscrews
(arrows)
on
early
cars
.
Note
Torx
screws
with
anti-tamper
pin
in
screw-head
.
ZAE
control
module,
replacing
NOTE-
Some
versions
of
early
ZAE
control
modules
are
no
longer
available
from
BMW
.
When
replacing
control
modules
on
cars
built
between
September
1993
and
June
1994,
consulta
BMW
parts
department
for
the
lat-
est
information
on
retrofitting
the
later
module
.
3
.
Remove
orange
SRS
connector
from
its
holder
and
carefully
separate
connector
.
Refer
to
Fig
.
7
.
1
.
Disconnect
negative
(-)
cable
from
battery
and
cover
negative
terminalwith
insulating
material
.
4
.
Working
behind
steering
wheel,
completely
loosen
Torx
screws
(T30)
while
holdingairbag
in
place
.
See
Fig
.
9
.
2
.
Lift
rearseat
cushion
.
Unplug
harness
connectors
and
Support
airbag
unit
toprevent
it
from
falling
out
.
remove
ZAE
airbag
control
module,
which
is
bolted
to
top
of
driveshaft
tunnel
.
3
.
Installation
is
reverse
of
removal
.
Front
side-impact
airbag
crash
sensor,
removing
and
installing
1
.
Disconnect
negative
(-)
cable
from
battery
and
cover
negative
terminal
with
insulating
material
.
2
.
Remove
front
seat
.
See520
Seats
.
3
.
Convertible
:
remove
rear
seat
4
.
Remove
plastic
door
sill
trim
.
5
.
Fold
up
carpet
in
back
of
front
seat
.
6
.
Pull
off
connector
from
crash
sensor,
which
is
located
under
rugnext
to
door
si¡¡
.
7
.
Remove
sensorby
removing
screws
.
Note
direction
ar-
row
before
removing
sensor
.
8
.
Installation
is
reverse
of
removal,noting
direction
arrow
on
sensor
.
AIRBAGS
AIRBAG
SYSTEM
(SRS)
721-
5
Driver
side
airbag,
removing
and
installing
1
.
Disconnect
negative
(-)
cable
from
battery
and
cover
negative
terminal
with
insulating
material
.
WARNING
-
On
cars
with
ZAE
system
:
If
theairbag
system
has
detected
a
fault
(SRS
indicator
illuminated),
a
wait-
ing
period
ofat
least
ten
minutes
must
be
observed
before
removing
the
airbag
from
the
steering
wheel
.
This
will
allow
the
system
capacitor
to
discharge,
re-
ducing
the
possibility
of
a
trigger
pulsebeinggener-
ated
to
the
airbag
.
CAUTION-
Prior
to
disconnecting
the
battery,
read
the
battery
disconnection
cautions
given
at
the
front
of
this
manual
on
page
vi¡¡
.
2
.
Remove
lower
steering
column
trim
mounting
screw
andremove
lower
trim
.
Refer
to
Fig
.
6
.
Fig
.
9
.
Driver
sideairbag
unit
mounting
screws
(arrows)
.
0011893
AIRBAGS

I
II
FUSE
FUSE
USE
FUSE
FUSE
II
Ffi
F7
FB
FS
F10
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5A
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20A
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20A-___-_____________
___________________
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L-1
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REAR
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PASSENGER'S
LEFT
CENTRAL
RIGHT
TRUNKBODY
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DEFOGGER
DOORDOOR
DOOR
LOCKING
DOOR
LOCK
ELECTRONICS
RELAYRELAY
LOCK
LOCK
LOCK
SWITCH
LOCK
MOTOR
CONTROLMODULE
SWITCHSWITCH
MOTOR
(1996)
MOTOR
(ZKEIV)
W1
RASH
CONTROL
MODULE
FROHTPOWER
I
DISTRIBUTION
BOX
FUSE
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L-1
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ELECTRICAL
WIRING
DIAGRAMSELE-27
Power
Distribution
1995-96
318ti
(4
of
5)
FRONT
-,
CIGAR
I
LIGHTER
G203
CRASH
HAZARD
BODY
WIPER
WIPER/
LIGHT
ABSPUMP
CONTROL
FLASHER
ELECTRONICS
RELAY
WASHER
SWITCH
OTOF
RELAY
MODULE
RELAY
CONTROL
MODULE
MODULE
(USA)
(ZKE
IV)
REDFROM
FRONT
POWER
DISTRIBUTION
BOX
(DIAGRAM
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OF
5)
_I
L-1
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RADIO
HIFI
ABSRELAY
AMPLIFIER
RED/WH
(II
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ELE-34
ELECTRICAL
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DIAGRAMS
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Power
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1998
318ti
(3
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I
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MODULE
104430
UNIT
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15A
25A
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ELE-40
ELECTRICAL
WIRING
DIAGRAMS
RIGHTHEADLIGHT/
RIGHT
I
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TURN
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34
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1994-95
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318ti
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G201
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ELE-44
ELECTRICAL
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64323
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PASSENGERSPASSENGERS
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SUPPRESSION
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Distribution
1994-95
Except
318ti
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of
5)
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