Interior BMW 318i 1997 E36 Repair Manual

640-8



HEATING
AND
AIR
CONDITIONING

0012649

Fig
.
22
.
A/
C
control
head
faceplate
screwson
rotary
knob
version
(ar-
rows)
.
Once
screws
are
removed,
faceplate
must
be
un-
clipped
from
control
head
.

Fig
.
23
.
Push
control
panel
out
ofcenter
console
.

4
.
Remove
harness
connectors
.
Unfasten
heater
duct
control
flex-shaft
on
right
side
of
control
head
by
squeezing
retaining
tab
.
PA
shaftout
of
coupling
in
control
head
and
remove
head
.

5
.
Installation
is
reverseof
removal
.

HEATER
AND
CONTROLS

0012650

Heater
and
A/C
control
head,

removing
and
installing(digital-display)

1
.
Remove
Multi-Information
Display
(MID)
module
from

center
of
dash
.
See
620
Instruments
.

2
.
Reach
into
dash
through
MID
opening
and
push
A/C

control
head
outwards
.

3
.
Disconnect
harness
connector
and
remove
control

head
.

4
.
Installation
is
reverse
of
removal

Heater
andA/C
control
module,

removing
and
installing
(rotary-knob)

1
.
Remove
Multi-Information
Display
(MID)
module
from

center
of
dash
.
See
620
Instruments
.

2
.
Remove
center
console
.
See
513
Interior
Trim
.

3
.
Disconnect
wiring
harness
connectors
to
A/C
control

module
in
center
console
and
removemodule
.
See
Fig
.

24
.

0013007
Fig
.
24
.
A/
C
control
module
(A)
in
center
console
.
Arrows
point
to
electrical
harness
connectors
at
A/Cmodule
.

Heater
and
A/C
control
module,

removing
and
installing(digital-display)

TheA/C
control
module
for
cars
with
the
digital
display
is
mounted
on
the
back
of
the
control
head
.
See
Fig
.
25
.

1
.
Remove
control
head
as
described
earlier
and
place
onan
anti-static
mat
.

Sensor

fan

Fig
.
25
.
Digital
display
A/C
control
head
components
.

2
.
Unscrew
left
and
right
screws
retaining
control
head
to
control
module
.
Press
retaining
clips
and
release
front
plate
from
control
head
.
Remove
A/C
control
module
from
control
head
housing
.

Sensor
fan
for
interior
temperature,

repiacing

A
small
electricfan,installed
in
the
A/C
control
head,
draws
cabin
air
past
the
climate
control
temperature
sensor
.

1.
Remove
A/C
control
head
as
described
earlier
.

2
.
Rotary-knob
control
head
:
Disconnect
electrical
con-
nector
from
top
of
control
head
housing
.
Pry
open
plas-

tic
housing
and
remove
sensor
fan
.
See
Fig
.
26
.

0013181

Fig
.
26
.
Sensor
fan
(A)
and
harness
(B)
in
back
of
A/C
control
head
(rotary-knob
control
head
shown)
.

3
.
Digital
display
models
:
Disconnect
electrical
harness

connector
from
control
head
housing
.
Remove
screws

holding
sensor
fan
to
bottom
of
control
moduleand
re-
move
.
Refer
to
Fig
.
25
.

4
.
Installation
is
reverse
of
removal
.

HEATING
AND
AIR
CONDITIONING



640-
9

Heater
and
A/C
Air
Distribution
Motors

The
recirculation,
fresh
air
and
othervent-duct
flaps
are
controlled
electrically
via
a
series
of
air
distribution
actuating
motors
.
Cars
with
the
rotary-knob
control
head
use
three
elec-
tromechanical
motors,
each
held
in
place
via
a
small
plastic
clip
.
See
Fig
.
27
.

Rightside
of
heater
box
l

Fig
.
27
.
Location
of
early
production
air
distribution
motors
(arrows)
.

Later
systems
(with
the
digital
display
control
head)
use
five
distribution
motors,
four
of
which
are
digítally
controlled
.
See
Fig
.
28
.

HEATER
AND
CONTROLS

640-10



HEATING
AND
AIR
CONDITIONING

i

El
Radio

Antenna

Rear



.
,



si,-
Left
side



I
d

1
.
Rear
vents
2
.
Fresh
air
3
.
Face-level
vents
4
.
Recirculation
5
.
Footwell
vents
0013017

Fig
.
28
.
Location
oflate
production
air
distribution
motors
in
heater
box(shown
in
rear,
side
and
top
views)
.

Heater
andA/C
air
distribution
motor,

replacing
(rotary-knob)

1
.
Toaccess
left
side
motors
(dash
vent
mixing
or
recircu-

lation
flap),
remove
lower
dash
panel
and
knee
bolster

on
driver
side
.
See
513
Interior
Trim
.

2
.
To
access
right
side
motor
(fresh
air
flap),
remove
glove

compartment
.
See513
Interior
Trim
.

3
.
Each
motor
can
be
removed
after
its
electrical
wiring

harness
connector
has
been
removed
.
Squeeze
plastic

clip
to
release
motor
.
See
Fig
.
29
.

Fig
.
29
.
A/
C
air
distribution
motor
plastic
retaíning
clip
(arrow)
.
Re-
lease
clip
and
tilt
motor
out
of
housing
.

Rear
Window
Defogger

0011877

The
rear
window
defogger
switch
is
integrated
with
the
heating
andA/C
control
head
.

HEATER
AND
CONTROLS

Fig
.
30
.
Wiring
diagram
of
rear
window
defogger
and
radio
antenna
.

Rear
Window
Blower
(Convertible
Models)

A
blower
fan,
fitted
into
the
rear
seatback,
defogs
therear

window
.
It
will
only
operate
with
the
engine
nunning
and
the

top
raised
.
A
microswitch
behindthe
rear
seats
provides
the

signal
that
thetop
is
raised
.

To
access
the
blower
fan
motor,
it
is
necessary
to
remove

four
screwsfrom
the
center
seat
back
.
Remove
the
wiring
har-

ness
connector
and
motor
mounting
boits,
then
remove
motor

by
pulling
it
down
and
forward
.
See
Fig
.
31
.

ri

Suppressor
filter

1
0013005

Fig
.
31
.
Rear
window
blower
in
center
of
rear
seat
back
(arrow)
.

The
electric
rear
window
defogger
is
integrated
with
the
ra-

dio
antenna
.
See
Fig
.
30
.



y



/f



0013014

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

721-
6



AIRBAG
SYSTEM
(SRS)

5
.
Carefully
lift
airbag
unit
off
steering
wheel
and
discon-



6
.
Installation
is
reverse
of
removal
.
Tighten
right
side
nect
orange
harness
connector
from
rear
of
airbag
unit
.



screw
on
airbag
first
(as
viewedfrom
driver's
seat),

See
Fig
.
10
.



then
left
side
screw
.

NOTE-



NOTE-

In
some
models,
theairbag
electrical
connection
to
the



If
there
is
no
electrical
harness
connector
between
the
steering
wheel
isvia
aplug
in
back
of
the
airbag
unit
.



airbag
and
the
steering
wheel,
be
sure
to
fit
the
push
There
is
no
wire
harness
to
disconnect
.



in
electrical
plug
in
back
of
the
airbag
finto
the
proper
re-
ceptacle
in
the
steering
wheel
.

Fig
.
10
.
Driver
sideairbag
unit
harness
connector
(arrow)
.

AIRBAGS

WARNING
-

"
Store
the
removed
airbag
unit
with
the
horn
pad
facing
up
.
If
stored
facing
down,
accidental
de-
ployment
couldpropel
it
violently
into
the
air,
causing
injury
.

"
Once
an
airbag
is
removed,
the
car
must
not
be
driven
.

"
Do
not
connect
the
battery
with
the
airbag
dis-
connected
.
A
fault
code
will
be
stored,
setting
off
the
SRS
warning
light
.
Special
tools
are
needed
to
reset
the
fault
memory
.

"
Special
instructions
apply
when
installing
an
air-
bag
equipped
steering
wheel
.
See
320
Steering
and
Wheel
Alignment
.

"
Once
the
airbag
unit
is
installnd
and
all
other
ser-vice
procedureshave
been
completed,
start
the
engíne
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
by
an
authorized
BMW
dealer
.

0013184

Tightening
Torque

"
Airbag
unitto
steering
wheel
........
8
Nm
(71
in-lb)

Passenger
side
airbag,

removing
and
installing

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

2
.
Remove
glove
compartment
.
See
513
Interior
Trim
.

3
.
Lift
cover
from
topof
passenger
sideairbag
on
dash-
board
.
See
Fig
.
11
.

0013108
Fig
.
11
.
After
removing
glove
compartment,
lift
out
passenger
side
air-
bag
cover
.
Note
airbag
mounting
bolts
(A)
and
airbag
electri-
cal
connector
(B)
.

4
.
Remove
passenger
sideairbag
mounting
bolts
.
Dis-
connect
electrical
harness
connector
from
rear
of
air-
bag
unit
and
remove
airbag
.

5
.
Installation
is
reverse
of
removal
.
Make
sure
wiring
har-
ness
is
not
pínched
when
installing
airbag
unit
in
dash-board
.

GENERAL

This
section
contains
wiring
diagrams
for
1992
through

1998
BMW
3
Series
models
.

WARNING
-

On
cars
equipped
with
airbags,
special
precautions
apply
to
any
electrical
testing
or
repair
.
The
airbag
unit
is
an
explosive
device
and
must
be
handled
with
exterme
care
.
Before
starting
any
work
onan
airbag
equipped
car,
refer
to
the
warnings
and
cau-
tions
in
720
Seatbelts
and
721
Airbag
Systems
(SRS)
.

NOTE-

The
"



gear
position/neutral
safetyswitch
is
also
some-
timesreferred
to
as
the
automatic
transmission
range
switch
.

"
The
EWS
11
system
is
also
sometimes
referred
to
as
the
Driveaway
Protection
System
or
the
electronic
im-
mobilization
system
.

ELECTRICAL
WIRING
DIAGRAMS



ELE-1

Electrical
Wiring
Diagrams

GENERAL
.
.
.
.
.
.
.
.
.
................
.
.
.
ELE-1



Horns



.....
.
.....
.
.
.
....
.
.
.
.
.
...
.
.
ELE-153

Instrument
Panel
.
.
.
.
.
.
..............
ELE-165

ELECTRICAL
WIRING
DIAGRAMS
...
.
.
.
ELE-2



Interior
Lights/Illumination
.............
ELE-211

ABS



..............
.
.
.
.....
.
.....
ELE-117



Lumbar
Control
.
....................
ELE-247

ABS/AST
.............
.
.
.
...
.
.
.
.....
ELE-120



On-Board
Computer
..................
ELE-173

Airbag
(Supplemental
Restraint
System)
..
ELE-140



Park
Ventilation
.
.
.
...........
.
...
.
..
ELE-139

Air
Conditioning
and
Heating
.
.
.
.
.
.
.....
ELE-129



Power
Distribution
......
.
...
.
.
.
.
.
.
.
...
.
ELE-2

Anti-Theft
(Alpine)
..........
.
.
.
...
.
...
ELE-144



Power
Door
Locks
.
.
......
.
.
.
.
.
.
.
.
.
..
ELE-226

Anti-Theft
(EWS
II)
.
........
.
.
.
...
.
...
ELE-150



Power
Mirrors
...
.
.
.
......
.
.
.
.
.
.
.
.
.
..
ELE-241

Body
Computer
Module
.....
.
.....
.
...
ELE-176



Power
Seats
......
.
......
.
.
.
...
.
.
.
..
ELE-243

Charging
System



.
.
................
.
.
.
ELE-67



Power
Sunroof
.
.
.
.
.
.
.
...............
ELE-248

Convertible
Top
.
.
.
.
................
.
.
ELE-253



Power
Windows
.
.
.
.
.
.
.....
.
.........
ELE-231

Cruise
Control
..
.
.
.
...........
.
....
.
.
ELE-112



Radio/Cassette/CD/Speakers
..........
ELE-255

Data
Link
Connector
................
.
.
.
ELE-86



Rear
Window
Defogger
...............
ELE-160

Engine
Cooling
.......
.
.......
.
....
.
.
.
ELE-94



Shift
Interlock
.
.
.
.
.
.
.
.
...............
ELE-110

Engine
Management
...
.
.......
.
....
.
.
.
ELE-70



Starting
....
.
.
.
.
.
...
.
................
ELE-63

Exterior
Lights
........
.
.
.
.
.
.
.
.
.
......
ELE-194



Transmission
Electronics
.
..............
ELE-96
Ground
Distribution
....
.
.
.
.
.
.
.
.
.
.......
ELE-35



Warning
System
:
Chimes
.............
ELE-178

Headlights/Foglights
...
.
.
.
.
.
.
.
.
.
......
ELE-180



Wiper/Washer
.
.....
.
...............
ELE-155

Heated
Seats
........
.
.
.
.
.
.
.
.
.
......
ELE-245

ELECTRICAL
COMPONENT
LOCATIONS

Relayand
fuse
positions,
ground
locations
...........
.
.
.
.
.
.
.
.
.
................
seeRepair
Group
610

CAUTION-

Always
switchthe
ignition
off
and
disconnect
the
negative
(-)
battery
cablebefore
removing
any
electrical
components
.

"
Prior
to
disconnecting
the
battery,
read
the
bat-tery
disconnection
cautions
given
at
the
front
of
this
manual
on
page
viii
.

"
Connect
and
disconnect
ignition
system
wires,
multiple
connectors
and
ignition
test
equipment
leads
only
while
ignition
is
switched
off
.

-Always
switch
a
test
meter
to
the
appropiate
func-
tion
and
range
before
making
test
connections
.

"
All-Season
Traction
(AST)
is
also
referred
to
as
ASC
or
ASC+T
.

GENERAL

CALWIRING
DIAGF
Power
Di
:

1992-93

RED
FROMFRONTPOWER
DISTRIBUTION
BOX
(DIAGRAM
1
620F7)
1
FRONTPOWER
DISTRIBUTION
BOX

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CLOCK



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SOCKET



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LIGHT



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ASSEMBLY



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1
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BOX
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RIGHTPARK/
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CONTROLFLASHER
LOCKING
RELAY
WASHER
SWITCH
LICENSEPLATE
MOTORRELAV
MODULE
RELAY
MODULE



MODULE
(USA)
LIGHTRELAV
(CANADA)
64784

ELE-16
ELECTRICAL
WIRING
DIAGRAMS

88978

TO
FUSE
F16
yDIAGRAM
4
OF
5)
70FU
SEF28



K



GRN
(DIAGRAM
4OF5)

___
--------
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______________
I
IGNITION
I
SWITCH
I



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_-_-__-
-----------
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OFF



START



OFF



START



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START



F,



START

FROM
FRONT
POWER
r
<
DISTRIBUTION
BOX
(DIAGRAM
2OF5)

=OC---U-
-_-_---_-__-ACC--RU=
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CC-PUN

Power
Distribution

1996-97
Except
318ti
(3
of
5)

ELECTRONICIMMOBLIZER
CONTROL
MODULE
(EWS11)

NOTUSED

2_
.
15



t

I
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RELAY
ENGINECONTROL



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No
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(1996)

-----



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BOX
(DIAGRAM
3
OF5)



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WASHER



MODULE
PUMPMODULE



MODULE



(1996
CANADA)
(1996
CANADA)

SEAT



RIGHTSIDE



LEFT
SIDE



SRS



ROLLOVER
OCCUPANCY
IMPACTIMPACT
CONTROLSENSOR
DETECTOR
SENSORSENSOR
MODULE
(1997)(1997)(1997)

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TELEPHONE
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LEF7MAKEUP



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(1997)
MI
PROFLIGHT



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SPATIALSOUND



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MIRROR
LIGHT



INTERIOR
(1996)
DETECTOR



ASSEMBLY
(199fi)

FROMFISE
141
---
(DIAGRAM
30F5)
M



________--_--_________________-_----------------



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DISTRIBUTIONBOX
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TRANSMITTER
INSTRUMENT
BRAKELIGHT
CRUISECONTROL
CRUISECONTROL
TRANSMITTER
COMPUTER
CONTROL
RELAY
MOTOR
IMMOBILIZATION
MODULE
CLUSTER
SWITCH
MODULE
SWITCH
MODULE
MODULE
(1996)
RELAY
SWITCH
(1996)
(1998)



(1997)

0
TALINK
CONNECTOR