Page 101
er
156 Interior lighting
22A
50
51
52
53
ser cose
54
58
59
i i 98
| 117
| 15%
|
152A
152B
1/5
Locations of components
Fuse holder
in the electrical distribution box, in the en-
gine compartment, on the left-hand wheel
housing
Roof lamp, centre
in the centre of the roof lining
Roof lamp, front
on the roof, behind the inner rear-view mir-
ror
Ignition switch lighting
between the front seats, at the ignition
switch
Interior lighting switch
between the front seats, at the gear lever
Door switches, interior lighting
in each door pillar
12-pole connector
on the angle bracket, under the facia on the
left-hand side (behind the knee shield)
2-pole connector
one in the luggage compartment, above the
left-hand wheel housing, behind the trim
one behind the roof lining, at the rear-view
mirror
Single-pole connector
between the front seats, under the centre
console
Seat belt/ignition switch warning relay
under the back seat, on the left-hand side
10-pole connector
to the left of the steering column, behind the
knee shield below the facia
Earthing point
at the handbrake (1987)
between the ignition switch and the hand-
brake (1988)
Time-delay relay for the interior lighting
under the back seat, on the left-hand side
29-pole white connector
29-pole red connector
in the engine compartment, in the electrical
distribution box on the left-hand wheel
housing. The connectors are accessible
from the interior of the car
Control unit for the central locking system
under the facia on the right-hand side, be-
hind the knee shield
Saab 900
Page 102
Interior lighting 157
Components
en-
eel
lir-
on
52
Page 103
158 Interior lighting — Convertible
Interior lighting — Convertible
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Saab 900
Page 104
Interior lighting — Convertible 159
Operation
The lighting is supplied across fuse 28 and 29-pole
white connector 152A, regardless of the position of
the ignition switch.
The interior lights can be switched on and off by
means of interior lighting switch 53, at the ignition
switch.
When the switch is in the front position (3), front lamp
51 at the rear-view mirror, ignition switch lamp 52
and reading lamps 225 are always switched on.
In the rear position (2), the interior lighting will be
switched on if one of the door switches 54 is closed,
i.e. if a door is opened, In the centre position, the
interior lights are always off,
Door switch 54 for the left-hand front door is sup-
plied via seat belt/ignition switch warning relay 82.
Time delay
Time-delay relay 151 for the delayed interior lighting
is supplied across fuse 12 when the ignition switch is
in the drive position, and with a constant supply from
distribution terminal +30, regardless of the position
of the ignition switch.
When the interior lighting is switched on by a door
being opened, terminal T is earthed and relay 151is
energised.
When the circuit is subsequently broken by the door
being closed, the interior lighting will remain
switched on, since the timing circuit of the relay will
keep the earth circuit closed across terminals T and
31.
The time delay is around 15 seconds, but will be
interrupted if the ignition switch is turned to the drive
position. A positive voltage (from +54) is then sup-
plied to terminal 15 of the relay. Both terminals -15
and 30 — then receive a positive supply. The relay is
thus de-energised and the earth circuit across termi-
nals T and 31 is broken.
Fault-tracing hints
4. Check fuse 28 and check that the supply to it is
live.
2. Check the bulbs for the interior lighting and
check that the supply to them is live.
3. Check the interior lighting switch and the door
switches.
4. Check the connectors, cable harnesses and
earth connections.
Time delay
4. Turn the ignition switch to the drive position.
Check fuse 12 and check that the supply to it is
live.
2. Check that terminals 15 and 30 of relay 151 are
live.
Saab 900
Page 105
160 __Interior lighting — Convertible
Locations of components
22A
51
52
53
54
59
60
82
117
151
152A
1528
175
225
Fuse holder
in the electrical distribution box, in the en-
gine compartment, on the left-hand wheel
housing
Roof lamp, front
behind the inner rear-view mirror
Ignition switch lighting
between the front seats, at the ignition
switch
Interior lighting switch
between the front seats, at the gear lever
Door switches, interior lighting
in each door pillar
12-pole connector
on the angle bracket, under the facia on the
left-hand side (behind the knee shield)
2-pole connector
behind the trim, at each reading lamp
Single-pole connector
between the front seats, under the centre
console
Seat belt/ignition switch warning relay
under the back seat, on the left-hand side
10-pole connector
to the left of the steering column, behind the
knee shield below the facia
Earthing point
at the handbrake (1987)
between the ignition switch and the hand-
brake (1988)
Time-delay relay for the interior lighting
under the back seat, on the left-hand side
29-~pole white connector
29-pole red connector
inthe engine compartment, in the electrical
distribution box on the left-hand wheel
housing. The connectors are accessible
from the interior of the car
Electronic unit for the central locking sys-
tem
under the facia on the right-hand side, be-
hind the knee shield
Reading lamp
one on each side of the back seat
Saab 900
Page 106
Interior lighting — Convertible 161
Components
in the en-
ind wheel
! ignition
ar lever
laonthe
ield)
mp
? centre
lay
id side
lind the
| hand-
ing
dside
Ctrical
wheel
ssible
§ sys-
8, be-
52
Saab 900
Page 107
162
Glove compartment illumination
Glove compartment illumination
+54
11G
Wa 2-5
318A
SV 0.75
> 36
107
SVE25
374
107A
SV 2.5
Saab 900
Page 108
Glove compartment illumination 163
Operation Fault-tracing hints
The supply for the glove compartment illumination is The glove compartment illumination operates when
taken from fuse 10, via 29-pole red connector 152B. the light switch is in position 1.
When the glove compartment lid is opened, switch 1. Check fuse 10 and check that the supply to it is
160 will close, earthing glove compartment lamp 19 live.
and: calssing to EnEUp. 2. Check the bulb and check that the supply to it is
live.
3. Check the switch.
4. Check the connectors, cable harnesses and
earth connections.
Saab 900
Page 109
164 Glove compartment illumination
Locations of components
3
ag
22A
36
74
152B
160
Earthing point in the facia
Glove compartment lamp
inthe glove compartment, on the right-hand
side of the facia
Fuse holder
in the electrical distribution box, in the en-
gine compartment, on the left-hand wheel
housing
Motor for the ventilation fan
behind the right-hand speaker grille
Resistor for ventilation fan
accessible under the left-hand speaker
grille
29-pole red 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.
Switch for glove compartment illumination
on the right-hand side of the glove compart-
ment
Saab 900
Page 110
sht-hand
1 the en-
1d wheel
speaker
the en-
d wheel
dle from
ination
ompart-
Glove compartment illumination
165
Components
160
19
Saab 900