Page 31
270 ~=Central locking
Central locking
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Saab 900
Page 32
Central locking 271
Operation
The central locking system of the car locks or unlocks
all doors and the luggage compartment lid when the
key is turned in the lock of the driver's door.
Terminal 4 of electronic unit 175 for the central lock-
ing system is continuously supplied from fuse 24, via
the 29-pole white connector 152A. The electronic
unit is controlled by control unit 183. which is
mounted in the driver's door.
When the driver's door is locked, terminal 1 of the
electronic unit will be earthed across the control unit
to negative distribution terminal 158. Current will
then flow from output 8. All central locking motors
(which are connected in parallel) will now be ener-
gised for approx. 1 second and the doors will lock.
The motors are earthed through pin 7 of the elec-
tronic unit, and on from terminal 3 to earthing point
65.
When the driver's door is unlocked, terminal 2 of the
electronic unit will instead be earthed across the
control unit. The motors will now be energised from
pin 7 instead, and will be earthed across pin 8 of the
electronic unit (for approx, 1 second), causing the
locks to open,
On right-hand drive cars, the control unit Is con-
nected to connector 57R, and motor 184 for the co-
driver's door lock is connected to connector 59R.
Fault-tracing hints
1. Check fuse 24 and check that the supply to it is
live.
2. Check that the supply to terminal 4 of electronic
unit 175 is live.
3. Check that pin 7 of the electronic unit is live
when the doors are being unlocked and that pin
8 is live when the doors are being locked.
Note that terminals 7 and 8 are energised for
only around one second in conjunction with lock-
ing and uniocking. Measurement at these termi-
nals must therefore be carried out when control
unit 183 is switching over.
4. Cheek the connectors, cable harnesses and
earth connections.
Note:
On testing, the actuating motors may be connected to
terminals 7 and 8 of the electronic unit only, Do not
connect them to any other power supply sources.
Doing so may overload the motors and damage them.
Saab 900
Page 33
272 Central locking
Locations of components
22
57
57R
59
59R
65
123
152A
158
175
183
184
185
186
188
Fuse box
in the electrical distribution box in the en-
gine compartment, on the left-hand wheel
housing
3-pole connector
one in the left-hand front door
one inthe engine compartment, atthe upper
hinge of the left-hand front door, behind the
electrical distribution box
3-pole connector
one in the right-hand front door
one inthe engine compartment, at the upper
hinge of the right-hand front door
2-pole connector
one in the right-hand front door
one inthe engine compartment, at the upper
hinge of the right-hand front door
one in the left-hand rear door
one in the right-hand rear door
one in the luggage compartment lid, near
the motor for the luggage compartment lock
one inthe luggage compartment, above the
left-hand wheel housing
2-pole connector
one in the left-hand front door
one inthe engine compartment, at the upper
hinge of the left-hand front door, behind the
electrical distribution box
Earthing point
at the handbrake
4-pole connector
one in the left-hand B pillar
one in the right-hand B pillar
29-pole white connector
in the electrical distribution box in the en-
gine compartment, on the left-hand wheel
housing. The connector is accessible from
the interior of the car
Negative distribution terminal
in the electrical distribution box in the en-
gine compartment, on the left-hand wheel
housing
Electronic unit for the central locking system
under the facia on the right-hand side, be-
hind the knee shield
Control unit for the driver's central door lock
in the driver's door
Motor for the co-driver’s door lock
in the co-driver's door, at the rear
Motor for the right-hand rear door tock
under the lock in the right-hand rear door
Motor for the left-hand rear door jock
under the lock in the left-hand rear door
Motor for the tailgate lock in the tailgate
Saab 300
Page 34
Centrallocking 273
Components
183
184
185
175 186 188
Page 35
278 Radio installation 1984 and 1985 models
Radio installation — 1984 and 1985 models
US, CA, JP
+30 +X
Ise 137
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Page 36
Radio installation — 1984 and 1985 models 279
Operation
Space has been reserved in the facia for a radio
(267). On certain markets/models, the car has also
been prepared for the installation of a radio by run-
ning the wiring for the speakers and an electrically
operated aerial to various points in the car.
Power supply
European and other markets
The following connectors are included in the radio
compartment in the facia:
® Asingle-pole connector (60) for the radio memory,
® A2-pole connector (59) for the power supply to the
radio and any booster amplifier, via fuse 28, which
is supplied directly from the battery (regardless of
the position of the ignition switch). Black = earth
and red = positive supply.
U.S.A., Canadian and Japanese markets
The following connectors are included in the radio
compartment in the facia:
© Asingle-pole connector (60) forthe radio memory.
© A 2-pole connector (59) for the power supply to
any booster amplifier, via fuse 28, which is sup-
plied directly from the battery (regardless of the
position of the ignition switch). Black = earth and
red = positive supply.
© A2-pole connector (59) for the power supply to the
radio, via fuse 20, which is supplied when the
ignition switch is in the park, drive or start posi-
tions. Black = earth and red = positive supply.
Speakers and aerial
The following components are included in the radio
compartment in the facia:
@ Two 4-pole connectors (123) for the front speak-
ers (266), one on each side of the facia. Each
speaker is connected via single-pole connector
60.
® Two 4-pole connectors (123) for the rear speakers
(266), one on each side of the parcel shelf.
@ A single-pole connector (60) for control of the
electrically operated aerial (265). The motor of the
electrically operated aerial is supplied via fuse 28.
© A ccaxial cable which runs to the mounting point
for the aerial, on the left-hand rear wing.
Fault-tracing hints
1. Check the supply to the radio and the earth
connection,
2. Check the connectors.
3. Check the existing cable harness for open cir-
cuits and short circuits to earth.
Saab 900
Page 37
Radio installation — 1986 models
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Page 38
Radio installation—1986 models 283
Operation
Space has been reserved in the facia for a radio
(267). On certain markets/models, the car has also
been prepared for the installation of a radio by run-
ning the wiring for the speakers and an electrically
operated aerial to various points in the car.
Two 10-pole connectors (98), one for the power sup-
ply and one for the speakers, are fitted in the radio
compartment in the facia. A coaxial cable has also
been run to the mounting point for the aerial, on the
left-hand rear wing.
Power supply
The following cables are connected to the upper 10-
pole connector 98 shown on the wiring diagram:
Grey (pin 1) — Positive supply via fuse 28, which is
supplied directly from the battery (regardless of the
position of the ignition switch).
Red (pin 4) — Positive supply via the ignition switch
and fuse 20. The radio is supplied when the ignition
Switch is in the park or drive positions.
Black (pin 5) — Earth.
Green (pin 6) — For control of the electrically operated
aerial (265). The motor of the electrically operated
aerial is supplied via fuse 28.
Brown/white (pin 8) — Dial lighting. The supply is
taken from the instrument lighting rheostat 16/17.
Speakers
The speaker connections are made via the lower 10-
pole connector.
Left-hand front:
Brown (pin 1)
Green (pin 2)
Right-hand front:
Blue (pin 3)
Red (pin 4)
Left-hand rear:
Brown/white (pin 5)
Green/white (pin 6)
Right-hand rear:
Blue/white (pin 7)
Red/white (pin 8)
Each speaker is connected via single-pole connector
60.
Fault-tracing hints
1. Check the supply to the radio and the earth
connection.
2. Check the connectors.
3. Check the existing cable harness for open cir-
cuits and short circuits to earth.