Page 241
364-4
Electric Controls and Switches
67643-53/913
Power window switch light bulb being replaced.
Fig. 11. Back-up light switch (arrow) on gear shift housing (manual transmission). Gear shift lever shown at top.
Fig. 10. Brake light switch (arrow) on brake pedal cluster. Switch
should always be adjusted after installation.
Fig. 12. Back-up light switch on models with automatic transmission being adjusted. With shift lever in N, align mark on
switch with lever (arrows).
Fig. 9.
NOTE
The cruise control brake switch and clutch switch are covered
in 368 Cruise Control.
The back-up light switch, used only on cars with manual
transmission, screws into the left side of gear shift housing.
See Fig. 11. To access the switch, remove the center console
as described in 432 Manual Transmission Controls.
On models with automatic transmission, the back-up light
switch is part of the neutral/safety (start inhibit) switch. To adjust this switch, move the lever to N (neutral) then loosen the
screws on the side and rotate the switch until the mark on the
switch aligns with the shift lever. See Fig. 12.
The handbrake warning lamp switch is located between the
seats under the handbrake bracket. Remove the center console as described in 432 Manual Transmission Controls
then remove the switch. See Fig. 13.
SWITCHES AND CONTROLS
Fig. 13. Handbrake warning lamp switch (arrow) can be removed
after removing center console.
Page 242
Electric Controls and Switches
364-5
The mercury switch on convertible models is used to pre
vent the rear window defogger from turning on when the roof
is in the down position. The switch can be removed after removing the screws. See Fig. 14. The switch is located at the
top of the frame member for the convertible top.
~<Xl
1\.1
B'1i
m
14. Mercury switch (arrow) interrupts power to heated rear window
when convertible top is down.
Engine Compartment Switches
Fig. 16. 5th gear lockout switch (arrow) for shift-up indicator.
Switch screws into right front transmission side cover,
near battery.
The throttle switch for the shift-up indicator is used on cars
with LH 2.2 Fuel Injection. On these models, a throttle dashpot
holds the throttle open for a short period of time. The throttle
switch is used to tell the shift-up relay that the accelerator pedal is released, even though the engine speed is still high. This
switch is mounted on the throttle housing. See Fig. 17. To remove the switch, simply remove the screws.
Most of the switches located in the engine compartment are
used to monitor engine conditions and are covered in the various repair groups under 2 ENGINE.
The temperature switch for the shift-up indicator prevents
the shift-up system from operating until the engine reaches a
certain temperature. The switch screws into the intake manifold. See Fig. 15.
Fig. 17. Throttle switch (arrow) for shift-up indicator on throttle
housing.
Fig. 15. Temperature switch (arrow) for shift-up indicator on in
take manifold. Saab 8-valve engine shown.
The fifth-gear lockout switch for shift-up indicator is showr
in Fig. 16.
SWITCHES AND CONTROLS
Page 243
364-6
Electric Controls and Switches
The brake fluid warning lamp switch is part of the fluid reser
voir cap. A float switch turns on the lamp when the fluid is low.
To replace the switch, remove the connector and unscrew the
cap. See Fig. 18.
Fig. 18. Location of brake fluid level warning lamp switch on master cylinder.
87653-S9/468
Extra Gauges
Extra gauges, available from Saab, can be located in the
center console storage area. See Fig. 19. When installing new
gauges, always follow the instructions that come with the instrument. The wiring shown in Fig. 20, Fig. 21, Fig. 22, and
Fig. 23 can be used as a guide in installing the gauges. All of
the gauges require a 52 mm diameter space in the console.
Fig. 19. Extra gauges in center console.
r-----+
VT
BR/VT
Fuse
The outside temperature gauge can be adjusted as shown
in Fig. 24. To calibrate the gauge, use a good quality temperature probe such as the Fluke® 80 multimeter.
Lighting
SV
VT=White
BR=Brown
SV=Black
NOTE
The calibration of the outside temperature gauge should be
done over a period of 20 minutes to prevent misleading temperature readings.
B7654-S9/362
Fig. 20. Wiring diagram for extra voltmeter,
SWITCHES AND CONTROLS
Page 244
Electric Controls and Switches
BR/VT
364-7
Outside temperature
,..--- + Lighting
sensor\
VT
Fuse
'-......- - - +
GN
Sensor
VT= White
BR= Brown
GL= Yellow
SV= Black
VT
+
Fuse
Lighting
VT=White
+
GN= Green
SV= Black
BR= Brown
87657-S9/365
87655-$9/363
Fig. 21. Wiring diagram for extra oil temperature gauge.
Fig. 23. Wiring diagram for extra outside temperature gauge.
RD
/Oil pressure
sender
VT
+
Lighting
SV
+
Fuse
VT= White
BR= Brown
RD=Red
BL= Blue
SV= Black
87656-S9/364
Fig. 22. Wiring diagram for extra oil pressure gauge,
Fig. 24. Outside temperature gauge being calibrated.
SWITCHES AND CONTROLS
Page 245
Cruise Control
368-1
368 Cruise Control
General
368-1
Component Locations
368-1
Electrical Tests and Fault Tracing
368-2
368-2
Checking Pedal Switches
Checking Vacuum Pump and Regulator
Checking Cruise Control Switch
368-3
368-3
TABLES
a. Cruise Control Switch Continuity Test.
GENERAL
368-4
1
WARNING
1990 and later models are equipped with an airbag or SRS
system. The airbag is a explosive device. Do not attempt to remove the steering wheel or service the wiring in the steering
column assembly. You could accidentally ignite the airbag,
causing serious personal injury. See an authorized Saab dealer for any repairs to the SRS system or to disarm the system
prior to removing the steering wheel.
The cruise control system enables the driver to select a
cruising speed that will be maintained without the use of the
accelerator pedal. The system can be turned on and off at the
steering column stalk switch. The system will automatically
disengage when either the clutch pedal or the brake pedal is
depressed. Fig. 1 shows the components of the cruise control
system.
When the Set button is depressed and the road speed is
above 23 mph, the speed transmitter sends an electronic
road-speed signal to the control unit. The control unit then operates the vacuum pump to increase or reduce vacuum to the
vacuum regulator, changing the position of the accelerator
pedal and throttle plate.
When the system is in operation, temporary acceleration
can be accomplished by depressing the accelerator pedal. As
soon as the pressure on the pedal is released, the car will resume the preselected cruising speed.
When the brake pedal or the clutch pedal is depressed, the
pedal switch releases vacuum in systems, allowing the throttle plate to return to the idle position. The vacuum pump is also
switched off.
Provided the road speed has not fallen below 23 mph, the
previously selected road speed can be resumed using the Resume function at the control switch. If the road speed has
gone below 23 mph, if the stalk switch is moved to the off position, or if the ignition is turned off, this memory function is canceled.
On turbo models, engaging the cruise control system causes the vacuum switch to interrupt power to the APe solenoid.
This automatically drops the turbocharger boost pressure to a
1.
Speed transmitter
Electronic control unit
Relay
(1985-1988 models only)
4. Vacuum pump
2.
3.
Fig. 1.
5.
6.
7.
8.
Vacuum regulator
Pedal switches
Control switch
Vacuum switch
(turbo models only)
Schematic view of cruise control system.
safe preset value. On 19a9 and later models, an instrument
cluster lamp is fitted that lights up when the cruise control is
engaged.
NOTE
Replacement of the cruise control indicator lamp on 1989 and
later models is covered in 351 Lighting.
COMPONENT LOCATIONS
The cruise control switch is located on the steering column.
For information on removing the switch, see 364 Electric
Controls and Switches.
COMPONENT LOCATIONS
Page 246
368-2
Cruise Control
The speed transmitter is fitted behind the speedometer.
The transmitter can be accessed through left speaker grille
access hole. See Fig. 2.
87462-S3/558
Fig. 4. Cruise control vacuum regulator (1) ancl pedal switches (2).
Remove lower trim panel to reach components.
Fig. 2. Speed transmitter (arrow) on rear of speedometer, Ac
cess transmitter through left speaker grille,
The electronic control unit and the cruise control relay
(where applicable) are located under the left-hand side of the
dashboard. See Fig. 3.
ELECTRICAL TESTS AND FAULT
TRACING
There are some basic fault tracing and electrical tests that
can be made to test the cruise control components. Be sure to
check the fuses. If the brake light bulbs are burned out, the
system will not engage. Complete cruise control wiring diagrams are shown in 371 Wiring Diagrams, Fuses and Relays.
Checking Pedal Switches
If the system is not working correctly, the first thing to check
is the vacuum lines at the pedal switches. Remove the lower
trim and inspect the hoses for cracks or deterioration. If no
faults are found, disconnect the vacuum hose at the switch
and connect in its place a length of rubber hose. While blowing
through the hose with the pedal in the rest position, air should
not pass through the switch. When the pedal is depressed, air
should pass through the switch.
NOTE
Fig. 3. Cruise control electronic control unit (1) and relay (2) as
viewed from underneath left-hand side of dashboard
(lower trim panel removed),
The vacuum regulator is mounted on a bracket in the heater
housing area, under the center of the dashboard. The brake
switch and the clutch switch (manual transmission only) are
mounted above the pedals. See Fig. 4.
The vacuum pump is mounted in the engine compartment,
forward of the left-hand wheel housing. On turbo models, the
vacuum switch is mounted in the engine compartment on the
left front fender.
The brake pedal switch is not the same switch used for the
brake lights. On 1989 and later models, the brake light switch
is also used in the cruise control circuit. Be sure to check that
the brake lights are operating correctly. If necessary, adjust
the brake light switch as described in 364 Electric Controls
and Switches.
To check the electrical part of the switch, disconnect the
wires from the switch and connect an ohmmeter across the
switch terminals. With pedal in the rest position, there should
be continuity. There should be no continuity when the pedal is
depressed.
If any faults are found, check that the switch is correctly adjusted as shown in Fig. 5. If no faults are found, the switch is
faulty and should be replaced.
ELECTRICAL TESTS AND FAULT TRACING
Page 247
Cruise Control
368-3
specified and the regulator does not respond correctly, the
regulator is faulty and should be replaced.
Remove the ground wire from terminal 2 only. The pump
should stop and the accelerator should remain in the open position. If the accelerator slowly returns the rest position, either
the regulator is leaking or the pump is faulty. To check for a
leaking regulator, connect to it a length of hose. Suck on the
hose and then block off then end. If the regulator slowly returns to its rest position, it is leaking and should be replaced.
Remove the wire from terminal 1 and check that the regulator returns to its rest position. If any faults are found, the pump
is faulty and should be replaced.
NOTE
When replacing the regulator, use care not to damage the rubber diaphragm during installation. Install the chain so that it is
as tight as possible without tensioning the accelerator.
Fig. 5.
Pedal switch adjustment. Adjust switch so that plunger
is exposed 1 mm (0.04 in.) as shown in inset
Checking Cruise Control Switch
Checking Vacuum Pump and Regulator
WARNING
Remove the Harness connector from the vacuum pump.
Connect a 12-volt source to terminal 3 (+) of the pump connector. Connect terminals 1 and 2 to ground. See Fig. 6. The
vacuum pump should run and draw the vacuum regulator in.
Check that the accelerator throttle plate is open.
1990 and later models are equipped with an airbag or SRS
system. The airbag is a explosive device. Do not attempt to remove the steering wheel or service the wiring in the steering
column assembly. You could accidentally ignite the airbag,
causing serious personal injury. See an authorized Saab dealer for any repairs to the SRS system or to disarm the system
prior to removing the steering wheel.
Remove the lower steering column trim and disconnect the
switch's 4-pin harness connector. Cut any wire ties if necessary. Fig. 7 shows the connector terminals. Test the switch by
making the checks listed in Table a. If any faults are found, the
switch is faulty and should be replaced as described in 364
Electric Controls and Switches.
87464
Fig. 6.
Vacuum pump and terminal designation.
87465
If the pump does not run, it is faulty and should be replaced.
If the pump runs, but the accelerator does not pull in and open
the throttle, check that the ball chain on the regulator is connected to the accelerator linkage. Check for vacuum to the
regulator with the pump running. If the pump operates as
1. Red wire
2. Brown wire
Fig. 7.
3. Green wire
4. Yellow wire
Cruise control switch harness connector used on 1985
through 1988 cars. Connector used on 1989 and later cars is
different, although wire colors and their respective terminals
numbers are the same.
ELECTRICAL TESTS AND FAUL T TRACING
Page 248
368-4
Cruise Control
Table a. Cruise Control Switch Continuity Test
Switch
position
1985-1987 (up to chassis no.
H2013308
1987 (from chassis no. H2013309)
1988
1989 and later
OFF
no continuity between any terminals
2 and 3
no continuity between any terminals
ON
1 and 2
1 and 2
1 and 2
RESUME
1 and 2, 2 and 4
1 and 2, 2 and 4
1 and 2,2 and 4
SET SPEED ON
2 and 3
2 and 4
(continuity between 2 and 3 is
removed when button is depressed)
2 and 3
NOTE
On 1985 through 1988 models, the original design cruise control switch is no longer available. The superceded switch kit requires replacing the harness connector to match the
connector on the new switch, removing and discarding the
cruise control relay and splicing the green wire of the relay
connector (terminal 86) into the red/white wire in the relay
connector
(terminal 30).
ELECTRICAL TESTS AND FAULT TRACING
If no faults are found up to this point, use the wiring diagram
to check for power and ground to the control unit. On 1989 and
later models, check for power and ground to the speed transmitter on the rear of the speedometer. If no faults are found
the problem may lie in the circuit wiring, the control unit, or the
speed sensor. Use the appropriate wiring diagram to check
for wiring faults.
Page 249
Wiring Diagrams, Fuses and Relays
371-1
371 Wiring Diagrams, Fuses and Relays
Main Fuse and Relay Locations
Main Fuse Positions
Main Relay Positions
Additional Fuse and Relay Locations
Components, Connectors and
Ground Locations
Ignition Switch and Positive Supply
371-1
371-5
371-5
371-5
0
371-6
371-7
Wiring Diagrams
371-7
Anti-lock Braking System (ABS)
371-8
Air Conditioner (AlC)
371-13
Alternator and Charging System
371-19
APC System . . . . . . . . . . . . . . . . . . . . . . . . . 371-23
Backup Lights
371-26
Brake Lights
371-28
Burglar Alarm
371-31
Central Locking
371-40
Combined Instruments
371-44
Convertible Top
. . . . . . . . . . . . . . . . . . . 371-49
Cruise Control.
371-51
Direction Indicators and Hazard
Warning Lights
371-55
Foglamps
371-58
Fuel System . . . . . . . . . . . . . . . . . . . . . . . . . 371-60
Glovebox Lighting
371-71
Headlights
371-73
Heated Rear Window and Cigarette Lighter. 371-75
Heated Seats
371-77
Horns
371-81
Ignition System
371-83
Interior Lighting
371-92
0
Lighting for Controls
Luggage Compartment Lighting
Parking Lights
Passive Seat Belts
Power Mirrors
Power Windows
Radiator Cooling Fan
Radio
Seat Belt and Ignition Key Warning
Shift-up Indicator
Starting System
Supplemental Restraint System (SRS)Airbag
Ventilation Fan
Wipers and Washers
• • • • • • • • • • • • • • • •
MAIN FUSE AND RELAY LOCATIONS
With the exception of the battery charging system, all electrical power is routed from the ignition switch or the battery
through the fuse/relay panel.
The main fuse/relay panel is located in the engine compartment, on the driver's side wheel housing. See Fig. 1. Always
check the cover on the panel for exact descriptions of fuses
and relays. Three main connectors run from the fuse/relay
panel to the interior of the car. These connectors are accessible from inside the car, behind the instrument panel. Note that
the connectors vary depending on model variant. See Fig. 2.
• • • • • • • • • • • • • • • •
0
,
•••••••
0
•••
371-98
371-102
371-104
371-107
371-110
371-112
371-118
371-120
371-125
371-128
371-130
371-133
371-136
371-138
:;:;:::;:;:;:;:;:::;:;:;:;
.;.:-:.;.:.:.:-:.:.:-:.".:
.:-:-:-:.;.:.:.:-:-:-:.;.;.
>:~:::::
!!!!!!:I!!I!:
TABLES
a. 1985 and 1986 Fuse positionsmain fuse/relay panel
b. 1987 and 1988 Fuse positionsmain fuse/relay panel
c. 1989 and 1990 Fuse positionsmain fuse/relay panel
d. 1991-1993 Fuse positionsmain fuse/relay panel
e. 1985 Relay positionsmain fuse/relay panel
f. 1986-1988 Relay positionsmain fuse/relay panel
g. 1989-1993 Relay positionsmain fuse/relay panel
h. Fuse/relay panel under rear seat
371-3
371-3
371-4
371-4
371-5
371-5
371-5
371-6
CAUTION
On cars equipped with SRS (airbag) the ignition switch must
be in the lock position before replacing any fuses. If fuse no. 7
is removed with the ignition switch in the drive or accessory
position, an SRS fault will register causing the SRS warning
light to come on. Only an authorized Saab dealer can erase
the fault and turn off the light.
Main Fuse Positions
Fuses prevent excessive current from damaging components and wiring. Fuses are color coded to indicate their different current capacities. Table a through Table d list the fuse
positions in the main fuse/relay panel.
Page 250
371-2
Wiring Diagrams, Fuses and Relays
152 (M85- M90)
H29 (M91- M91 1/2)
152A (M85-90)
H29-1 Red (M91-91 1/2)
H33-1 Grey (M91 1/2-)
Rear hamess ~
'" .
1528 (M85-90)
;;
H29-2Red(M91-911/2)
~ H33-2 Grey (M91 1/2-)
Hamesses for
instruments
"",_
152C (M85-90)
~ H29-3 Red (M91-91 1/2)
~
H33-3 Grey (M91 1/2-)
I
'-t?L.-'------;:=======---_
'-
Rear hamess in
H33 (M91 1/2 and later)
'(t?
~:
II
I engine compartment ~
I . _ _- .
,
I
I
l
~
I
I
Front hamess in
engine compartment
I
I
i
87466
_
_
I
_- - - - - - . l
Fig. 1. Exploded view of main fuse/relay panel. Main connectors vary
between years.
I
I
1
Fuse color and rating
• Red
• Blue
• Yellow
• Transparent
• Green
10 amp
15 amp
20 amp
25 amp
30 amp
87
_ 4_6_7
_
Fig. 2. Terminal identification for main bulkhead connectors at side of
fuse/relay panel.