air BMW 318i 1995 E36 Workshop Manual

640-16



HEATING
AND
AIR
CONDITIONING

A/C
expansion
valve,

removing
and
installing

Fig
.
45
.
Control
module
carrier
retaining
screws
(arrows)
.

1
.
Following
manufacturers
instructions,
connectanap-

proved
refrigerant
recovery/recycling/recharging
unit
to

A/C
system
and
discharge
system
.

WARNING
-

Do
not
discharge%harge
the
WC
system
without
properequipmentand
training
.
Damage
to
the
vehi-

cle
and
personal
injury
may
result
.

2
.
Remove
glove
compartment
and
glove
compartment

support
frame
.
See513
Interior
Trim
.

3
.
Remove
right
side
footwell
vents
.

4
.
Remove
right
side
control
module
carrier
screws
and
tilt

carrier
down
.
See
Fig
.
46
.

5
.
Remove
expansion
valve
cover
.
See
Fig
.
46
.

Fig
.
46
.
Four
screws
retain
expansion
valve
cover
(arrows)
.

AIR
CONDITIONING

0012666
0012663

6
.
Remove
A/C
refrigerant
line
fiange
bolt(s)
from
expan-

sion
valve
.
Plug
lines
immediately
.
See
Fig
.
47
.

NOTE
-

If
necessary,
remove
air
plenum
grille
fromrear
of
en-

gine
compartment
as
described
earlier
in
Blower
mo-

tor,
removing
and
installing
.
Remove
wiring
hamess

cover
screws
and
then
remove
right
side
plenum
screws
.
Reaching
finto
the
plenum
chamber,
remove
AIC
fine
flange
bolt
to
allow
expansion
valve
room
for
removal
.

Fig
.
47
.
Refrigerant
line
fiange
mounting
boltat
expansion
valve(arrow)
.

7
.
Remove
screws
from
top
of
expansion
valve
and
re-

move
expansion
valve
from
evaporator
.
See
Fig
.
48
.

Fig
.
48
.
Expansion
valve
mountingscrews
(A)
.

0011667

CAUTION
-

Always
replace
O-rings
when
reconnecting
refrig-
erant
fines
.

9
.
Before
recharging,
evacuate
system
for
at
least
30
min
.
Recharge
system
following
equipment
manufacturer's
instructions
.
See
Table
d
.
A/C
System
Refrigerant

Capacities
.

A/C
evaporator,
removing
and
installing

1
.
Followingmanufacturer's
instructions,
connectanap-proved
refrigerant
recovery/recycling/recharging
unit
to
A/C
system
and
discharge
system
.

2
.
Remove
complete
heater
boxas
described
earlier
.

3
.
Remove
expansion
valve
as
described
earlier
.

4
.
Unfasten
evaporator
sensor
electrical
harness
connec-
tor
and
puli
out
sensor
from
ieft
side
of
heater
box
.
See
Fig
.
50
.

Fig
.
49
.
Pull
out
evaporator
sensor
from
housing
in
direction
of
arrow
.

5
.
Remove
rear
heater
box
cover
.

6
.
Remove
clips
retaining
lower
evaporator
housingcover
.
Tilt
outheater
core,
then
pull
evaporator
out
of
housing
.

7
.
Installation
is
reverse
of
removal
.

CAUTION
-

Always
reptace
O-rings
when
reconnecting
refrtg-
erant
fines
.

8
.
Before
recharging,
evacuate
system
for
at
least
30
min
.

Recharge
system
following
equipment
manufacturer's
instructions
.
See
Table
d
.
A/C
System
Refrigerant

Capacities
.

HEATING
AND
AIR
CONDITIONING



640-17

8
.
Installation
is
reverse
of
removal
.



A/C
evaporator
temperature
sensor,

replacing

ou12b46

The
evaporator
temperature
sensor
is
mounted
in
the
left
(driver)
side
of
theheater
box
behind
thecenter
console
.

1
.
Remove
lower
dash
panel
and
knee
boister
on
driver
side
.
See
513
Interior
Trim
.

2
.
Remove
left
footwell
ventilation
duct
byremoving
re-
taining
rivet
in
bottom
of
duct
.
Pull
it
down
and
away
from
heater
box
.
See
Fig
.
50
.

Fig
.
50
.
Left
footwellventilatíon
duct
(arrow)
.

0o1300ba

3
.
Disconnect
sensor
electrical
connector
from
heater
box
.
Pull
sensor
straight
out
of
heater
box
.
Refer
to
Fig
.
49
.

4
.
Installation
is
reverse
of
removal
.
Table
c
.
lists
evapo-

rator
temperature
sensor
test
values
.

Tablec
.
Evaporator
Temperature
Sensor

Test
Values

Test
temp
.



Resistance

23°F
(-5°C)



11
.4
-11
.9
k
ohms

32°F
(0°C)



8
.8
-
9
.2
k
ohms

41
°F
(5°C)



6
.8
-
7
.2
k
ohms

50°F
(10°C)



5
.3-5
.6
k
ohms

59
°
F
(15°C)



4
.2
-4
.5
k
ohms

68°F
(20°C)



3
.3
-
3
.6
k
ohms

77°F
(25°C)



2
.6-2
.9
k
ohms

86°F
(30°C)



2
.1
-
2
.3
k
ohms

95°F
(35°C)



1
.7
-1
.9
k
ohms

AIR
CONDITIONING

640-18



HEATING
AND
AIR
CONDITIONING

A/C
microfilter,
replacing

1
.
Remove
glove
compartment
.
See
513
Interior
Trim
.

2
.
Remove
right
footwell
ventilation
duct
.
See
Fig
.
51
.

0012664

Fig
.
51
.
Unfasten
retaining
rivets
from
right
ventilation
duct
(arrows)
.

3
.
Remove
right
side
control
module
carrier
screws
and
tilt

carrier
down
.
See
Fig
.
52
.

Fig
.
52
.
Control
module
carrier
retaining
screws
(arrows)
.

0012666

4
.
Rotate
A/C
microfilter
housing
release
knob
about45°

counterclockwise
and
remove
filter
housing
cover
.
See
Fig
.
53
.

5
.
Remove
microfilter
while
moving
module
harnesses

out
of
the
way
.

6
.
Installation
is
reverse
of
removal
.

AIR
CONDITIONING

Fig
.
53
.
A/
C
microfilter
cover
release
knob
(arrow)
on
passenger
side
ofheater
box
.

Table
d
.
A/CSystem
Fluid
Capacities
(total)

Fluid



I
Quantity
R-12
refrigerant



1200g
t
25
g
(2
.65
Ibsa
0
.05lbs
.)

R-134a
refrigerant



1000
g
±
25
g
(2
.20
Ibs
.t
0
.05lbs
.)

PAG
oil
SP-10



1200
ml
f
20
ml(R12
system)
(6
.8
oz
.
±
0
.7
oz
.)

Nippondeso120mi
Refrigerant
oil
(R1
34a
system)



I
Seiko
Seiki
150m1

Rear
speaker,
removing
and
installing



Door
panel
speaker,

removing
and
installing

NOTE
-

Rear
speakers
in
convertible
models
are
installed
un-
der
the
rear
side
panels
.
For
rearside
panelremoval
procedure,
see
411Doors
.

1
.
Working
at
rear
parcel
shelf,
pry
speakercoverby
inner

edge
and
remove
.
See
Fig
.
12
.

0011632

Fig
.
12
.
Pry
up
inner
edge
of
speaker
cover
off
rear
parcel
shelf
.

2
.
Remove
mountingscrews
and
depress
speaker
retain-

ing
clip
.
See
Fig
.
13
.
Lower
speaker
into
trunk
.

Fig
.
13
.
Remove
screws
(A)
and
depress
clip
(B)
.

4
.
Installation
is
reverse
of
removal
.

0011633

3
.
Disconnect
speaker
connector
andremove
speaker

from
box
.

RAM
650-5

1.
On
carswith
side-impact
airbags,
disconnect
negative
(-)
cable
from
battery
.

CAUTION-

Prior
to
disconnecttog
the
battery,
read
the
battery
disconnection
cautions
given
at
the
front
of
this
manual
on
page
vi¡¡
.

2
.
Remove
inner
door
panel
.
See
411
Doors
.

WARNING
-

Some
1997
and
all
1998
model
year
cars
are
equipped
with
front
side-impact
airbags
in
the
front
doors
.
When
servicing
the
doors
with
front
side-im-
pact
airbags,
alwaysdisconnect
the
negative
()
battery
terminal
.
See
721Airbag
System
(SRS)
for
cautions
and
procedures
relating
to
theairbag
sys-
tem
.

3
.
On
back
of
door
panel,
remove
nut
on
top
of
speaker
retaining
bracket
and
remove
bracket
from
behind

speaker
.
See
Fig
.
14
.

Fig
.
14
.
Speaker
retaining
nut
(arrow)
.

4
.
Disconnect
speaker
connector
from
harness
connector
and
remove
loudspeaker
forwardthrough
door
panel
.

5
.
Installation
is
reverse
of
removal
.
Install
side-impact

airbag
using
new
screws
.
See
721
Airbag
System

(SRS)
.

RADIO
AND
SPEAKER
SERVICE

720-2



SEAT
BELTS

WARNING
-

"
For
maximum
protection
from
injury,
seat
belts

should
be
replaced
as
a
set
(including
all
hard-

ware),
if
they
are
subject
to
occupant
loading
in
a

collision
.
"
Seat
belts
should
not
be
modified
or
repaired
.

The
seat
belt
anchorage
points
should
not
be

changed
or
modified
.

"
Do
notbleach
or
dye
seat
belt
webbing
.
Webbing
that
is
severely
fadedor
re-dyed
will
not
meet
the

strength
requirements
of
a
collision
and
must
be

replaced
.

"
Seat
belts
shouldbe
periodically
inspected
for
webbing
defects
suchas
cuts
or
pulled
threads
.

FRONT
SEATBELT
ASSEMBLY

Automatic
Front
Seat
Belt

Lock
Tensioners

The
procedure
for
disabling
the
mechanical
spring
tension-

er
used
on
early
cars
is
covered
below
.
On
cars
with
thepyro-
technic(explosive
device)
tensioners,
the
orange
harness

connectorshould
be
removed
from
the
tensioner
any
time
the

seat
is
removed
.

WARNING
-

Both
the
mechanical
and
the
pyrotechnictensioners
are
powerful
devíces
and
shouldbehandled
with
extreme
care
.

Mechanical
spring
tensioner,
disarming

1
.
Remove
front
seat
.
See
520
Seats
.

2
.
Disarm
tensioner-electrically
adjustableseats
:

"
Working
at
side
of
seat,
turn
activating/deactivating

screw
clockwise
until
display
changes
from
green
to

red
.
See
Fig
.
2
.

"
Before
reinstalling
seat,
turn
screw
until
display
chang-
esback
to
green
.

NOTE-

Green
is
armed
.
Red
is
disarmed
.

3
.
Disarm
tensioner-manually
adjustable
seats
:

"
Cut
wíre
tie
next
to
tab
on
bowden
cable
.
See
Fig
.
3
.

"
Turn
and
lift
tabto
disengage
cable
housing
from
seat
bracket
.

"
Disconnect
cable
end
from
seat
lever
.
"
When
reinstalling,
correctly
engage
tab
end
of
cable

into
seat
bracket
and
fasten
in
position
using
new
wíre

tie
.

FRONT
SEATBELT
ASSEMBLY

0012737

Fig
.
2
.



Electrically
adjustable
front
seat
.
Turn
screw
(A)
to
disarm
me-

chanical
tensioner
.
Display
B
tucos
from
green
to
red
.

F19
.3
.
Manuallyadjustablefrontseat
.Turnandlifttab(arrow)todis-

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
.

1
.
Disconnect
negative
(-)
cable
from
battery
and
cover

negative
terminal
with
insulating
material
.

CA
UTION-

Prior
to
disconnectiog
the
battery,
read
the
battery
disconnection
cautions
given
at
the
front
of
this
manual
on
page
viii
.

2
.
Remove
driver
sideairbag
from
steering
wheel
.
See

Driver
side
airbag,
removing
and
installing
in
this

repair
group
.

3
.
With
wheels
facing
straight
ahead
and
steering
wheel

centered,
remove
steering
wheel
.
See320
Steering
and
Wheel
Alignment
.

4
.
Remove
contact
ring
cover
(flat
plastic
ring
containing

warning
text)
from
steering
wheel,
íf
applicable
.

5
.
Disconnect
ground
wire,
if
applicable

6
.
Lift
out
plastic
lock
from
steering
wheel,
if
applicable
.

See
Fig
.
2
.

0011903

Fig
.
2
.



Airbag
contact
ring
lock(arrow)
.
Pry
out
lock
and
remove
spríng
from
behind
lock
.
Some
airbag
steering
wheels
are
not
equipped
with
contact
ring
lock
.

WARNING
-

"
The
contact
ring
lock
holds
the
contact
ring
in
the
centered
position
.
Once
the
lock
is
removed,
the
contact
ring
is
free
to
rotate
.
Do
not
allow
the
con-

tact
ring
to
rotate
once
the
lock
is
removed
.

"
If
the
contact
ring
is
accidentally
rotated
outof
center,
turn
the
ring
either
fully
clockwise
orcoun-
terclockwise,
then
turn
in
the
opposite
direction
3
complete
revolutions
until
the
alignment
arrow
canbe
seen
through
the
lock
opening
.

AIRBAG
SYSTEM
(SRS)



721-
3

Airbagcontact
ring,
replacing



7
.
Remove
mounting
nutsor
screws
from
contact
ring
.

See
Fig
.
3
.
Disconnect
wire
lead(s)
andremove
contact

The
airbag
contact
ring
is
mounted
to
the
rear
of
the
steer-



ring
from
rear
of
steering
wheel
.

ing
wheel
and
is
made
up
of
a
wireribbon
that
cofs
and
un-

coils
as
the
steering
wheel
is
tumed
.
The
contact
ring
assures
continuous
electrical
contact
to
the
driver
side
airbag
unit
.

Fig
.
3
.



Airbag
contact
ring
mounting
fasteners(arrows)
.

8
.
Installation
is
reverse
ofremoval,noting
the
following
:

"
Coat
horn
slip
ring
(electrical
contact
ring)
with
CRC
®
copper
paste
before
installing
steering
wheel
.

"
Press
on
lower
lock
until
it
ís
fully
engaged
.

"
When
installing
contact
ringlock,
make
sure
lock

spring
engages
pins
on
lock
and
lock
cover
.

"
Special
instructions
apply
when
installing
airbag

equipped
steering
wheel
.
See320
Steering
and

Wheel
Alignment
.

Early
cars
(through
1993)
:

"
Route
wiring
lead
for
horn
through
squareopening
in

steering
wheel
.

"
When
installing
a
new
contact
ring
from
BMW,
remove

locking
screw
after
installing
the
contact
ringto
steer-

ing
wheel
.
See
Fig
.
4
.

"
Lock
contact
ring
mounting
fasteners
in
place
using

lacquer
paint
or
varnish
.

0011904

Fig
.
4
.



Airbag
contact
ring
locking
screw
(arrow),
as
installed
on
new

replacement
part
from
BMW
(early
production
cars)
.

AIRBAG
SENSORS
AND
ELECTRONICS

721-
4



AIRBAG
SYSTEM
(SRS)

CAUTION-

A
new
contact
ring
is
held
in
center
position
with
a
screw
.
This
locking
device
must
be
removed
after
contact
ring
is
installed
on
steering
wheel
.
See
Fig
.
4
.

Latercars
(1994
on)
:

"
Connect
ground
lead
at
contact
ring
.
"
When
installing
a
new
contact
ring
from
BMW,
remove

locking
pin
after
installing
contact
ring
to
steering
wheel
.

See
Fig
.
5
.

Airbag
crash
sensor,
replacing

Fig
.
5
.



Airbag
contact
ring
locking
pin
(arrows),
as
installed
on
new
replacement
part
from
BMW
(later
production
cars)
.
Contact
ring
mountíng
screws
shown
at
A
.

CAUTION-

Anew
contact
ring
is
held
in
center
position
with
a
screw
or
pin
.
This
locking
device
mustbe
removed
after
contact
ring
is
installed
on
steering
wheel
.
See
Fig
.
5
.

The
airbag
system
in
cars
produced
through
1993
uses
two
crash
sensors
mounted
in
the
engine
compartment
on
the
left
and
right
wheel
arches
.
The
sensors
are
identified
by
their
or-
ange
color
.

WARNING
-

If
en
airbag
is
deployed,
both
sensors
must
be
re-
placed
.

1
.
Disconnect
negative
(-)
cable
from
battery
and
cover
negative
terminal
with
insulating
material
.

CAUTION-

Prior
to
disconnectiog
the
battery,
read
the
battery
disconnection
cautíons
given
at
the
front
of
thls
manual
on
page
viii
.

AIRBAG
SENSORS
AND
ELECTRONICS

2
.
Remove
lower
steering
column
trim
mounting
screw
and
remove
lower
trim
.
See
Fig
.
6
.

Fig
.
6
.



Lower
steering
column
retaining
screw
(arrow)
.

3
.
Remove
orange
SRS
connector
from
its
holder
and
carefully
separate
connector
.
See
Fig
.
7
.

Fig
.
7
.



Orange
SRS
connector
below
steering
column
(arrow)
.

4
.
Working
in
engine
compartment,
remove
anti-tamper
Torx
screwsfrom
crash
sensor
.
Remove
sensor
and
disconnect
harness
connector
.
See
Fig
.
8
.

5
.
Installation
is
reverse
of
removal
.
Make
sure
arrow
on
sensor
faces
forward
when
installing
sensor
.

WARNING
-

Once
the
airbag
unit
is
installed
and
all
other
ser-vice
procedures
have
been
completed,
start
the
en-
gine
and
check
that
the
SRS
warning
light
goes
out
.
If
the
warning
light
stays
on,the
SRS
system
will
not
function
as
designed
.
Have
the
system
diagnosed
and
repaired
byen
authorized
BMW
dealer
.

0012543

0011891

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