Page 201
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lectrically operated sunroof
261
Components
181
AM
Saab 900
Page 202
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262 Electrically operated Convertible top
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Electrically operated Convertible top
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Saab 900
Page 203
2
ey
Electrically operated Convertible top
263
Operation
Two hydraulic cylinders actuated by oil from an elec-
tric-motor driven hydraulic pump are used for raising
and lowering the top.
Switch 181 for operating the top is supplied from
fuse 12 via 29-pole white connector 152A and
10-pole connector 98.
When the top is being lowered, current flows from pin
2 on the switch to relay 278, which is energised. The
relay coil is earthed across switch 43 for the hand-
brake warning lamp, and the handbrake must there-
fore be applied before the top can be operated.
Motor 273 of the hydraulic pump (P) is now supplied
across the relay contacts from battery 1 and fuse 290
(25 A). The motor is earthed through the second relay
(277) which is de-energised.
To raise the top, the direction of rotation of the motor
is reversed, since relay 277 is energised instead, and
relay 278 is de-energised.
Diodes 283 prevent reverse current and operation of
the relays in the wrong circumstances.
For a complete description of the wiring for the light-
ing of switch 181 on cars for the US, CA and JP
markets, see also the section entitled "Lighting for
controls, US, CA, JP”.
Fault-tracing hints
The top can be operated when the ignition switch is in
the drive position and the handbrake is applied.
4. Check fuse 12 and check that the supply to it is
live.
2. Check that the relays for raising and lowering
the top perform correctly and that the diodes are
in good condition.
3. Check that the relays are energised at terminal
87 and that the hydraulic pump motor is ener-
gised when the switch is actuated.
4. Check the connectors, cable harnesses and
earth connections.
Saab 900
Page 204
264
Electrically operated Convertible top
Locations of components
L
17
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43
58
60
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98
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152B
181
Past
273
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278
283
290
Battery
on the right-hand side of the engine com-
partment
Earthing point, radiator cross-member
Extra rheostat for the lighting of switches
and controls
Fuse holder
in the electrical distribution box, in the en-
gine compartment, on the left-hand wheel
housing
Handbrake switch
under the plastic cover at the handbrake
lever
12-pole connector
on the angle bracket, under the facia, to the
left of the steering column
Single-pole connector
two under the centre console, between the
front seats
Distribution block
in the engine compartment, on the side of
the right-hand wheel housing
10-pole connector
under the facia, to the left of the steering
column
Earthing point
at the handbrake (1987)
between the ignition switch and the hand-
brake (1988)
29-pole red connector
in the engine compartment, in the electrical
distribution box on the left-hand wheel
housing. The connector is accessible from
the interior of the car.
Switch for the electrically operated sunroof/
top
between the front seats, on the the centre
console
Earthing point on the gearbox
Motor for the hydraulic pump
under the back seat, on the right-hand side
Relay for raising the top
under the back seat, on the right-hand side
Relay for lowering the top
under the back seat, on the right-hand side
Diode for relay for operation of the top
under the back seat, on the right-hand side,
in the cable harness running to the relays
(277/278)
Fuse for the top
in the engine compartment, on the right-
hand side (at distribution block 75)
Saab 900
Page 205
Electrically operated Convertible top
265
Components
151
82] | 181 273
278
283 290 75
Saab 900
Page 206
266 = Central locking
Central locking
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Saab 900
Page 207
Central locking 267
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 control unit 175 for the central locking
system is continuously supplied from fuse 24, via
29-pole white connector 152A. The control unit is
controlled by key switch 183, which is mounted in the
driver's door.
1987 model
When the driver's door is locked, terminal 1 of the
control unit will be earthed across the key switch to
negative distribution terminal 158.
1988 model
When the driver's door is locked, terminal 1 of the
control unit will be earthed via earthing point 117.
Current will then flow from output 8. All central lock-
ing motors (which are connected in parallel) will now
be energised for approx. 1 second and the doors will
be locked. The motors are earthed through pin 7 of
the control unit, and on from terminal 3 to earthing
point 117.
When the driver's door is unlocked, terminal 2 of the
control unit will instead be earthed across the key
switch, The motors will now be energised from pin 7
instead, and will be earthed across pin 8 of the
control unit (for approx. 1 second), causing the locks
to open.
On right-hand drive cars, the key switch is connected
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 control
unit 175 is live.
3. Check that pin 7 of the control 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 only energised
for around one second in conjunction with lock-
ing and unlocking. Measurement at these termi-
nals must therefore be carried out when key
switch 183 is switching over.
4. Check the connectors, cable harnesses and
earth connections.
Note:
On testing, the actuating motors may be connected
to terminals 7 and 8 of the control unit only. Do not
connect them to any other power supply sources.
Doing so may overload the motors and damage them.
Saab 900
Page 208
CE ———
268 ~=—Central locking
Locations of components 184 Motor for the co-driver’s door lock
2°A Fuse holder Be co-driver’s door, at the rear, under the
in the electrical distribution box, in the en-
gine compartment, on the left-hand wheel 185 Motor for the right-hand rear door lock
housing under the lock in the right-hand rear door
57 3-pole connector 186 Motor for the left-hand rear door lock
one in the left-hand front door under the lock in the left-hand rear door
one in the engine compartment, at the up- i lock
per hinge of the left-hand front door, behind ane aur sitnetg rane ne
the electrical distribution box
57R 3-pole connector
one in the right-hand front door
one in the engine compartment, at the up-
per hinge of the right-hand front door
59 2-pole connector
one in the right-hand front door
one in the engine compartment, at the up-
per 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 in the luggage compartment, above the
left-hand wheel housing
59R 2-pole connector
one in the left-hand front door
one in the engine compartment, at the up-
per hinge of the left-hand front door, behind
the electrical distribution box
117 Earthing point
at the handbrake (1987)
between the ignition switch and the hand-
brake (1988)
123 4-pole connector
one in the left-hand B pillar
one in the right-hand B pillar
152A 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 inte-
rior of the car
158 Negative distribution terminal
in the electrical distribution box in the en-
gine compartment, on the left-hand wheel
housing
175 Control unit for the central locking system
under the facia on the right-hand side, be-
hind the knee shield
183 Key switch for the driver+s central door lock
in the driver's door
Page 209
ee
@u
Central locking 269
Components
175
183
184
185
186
188
Saab 900
Page 210
274 Speed Control system
Speed Control system
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