Cruise Control

���UCruise Control System:

WIRING DIAGRAM

Cruise Control System: Component Location:

COMPONENT LOCATION VIEW

Cruise Control System: Component ID:

COMPONENT ID
22a Main fuse board behind the access panel in the glove box.
29 Brake light switch beside the brake pedal.
30 Brake lights in the rear light clusters.
47u Cruise Control indicator lamp, in the main instrument display panel.
76 Idling speed increase switch in transmission range switch 239 adjacent to the selector lever.
132 Vehicle speed sensor, in the speedometer.
133 Clutch pedal switch, Cruise Control, on the clutch pedal.
134 Brake pedal switch, Cruise Control, on the brake pedal.
141 Cruise Control selector, on the direction indicator stalk switch on the left-hand side of the steering wheel.
228a Filament monitor, rear bulbs, in luggage compartment on the left-hand side.
230 Distribution terminal (+30 circuit) in main fuse box behind the glove box.
231 Distribution terminal (+54 circuit), in main fuse box behind the glove box.
239 Transmission range switch beside the selector lever.
430 Saab Trionic control module, in engine bay on the left behind the bulkhead partition.
507 TCS control module, V6, under left-hand seat.
508 Control module, Cruise Control system, adjacent to the battery tray.
589 Control module, Saab Trionic OBDII, in the engine bay on the left behind the bulkhead partition.

3-Pin Connectors
H3-20 Behind the main instrument display panel beside the speedometer (ME).
H3-26 (RHD) above the pedal assembly beside the pedal switches.

70-Pin Connector
H70-1 In the engine bay, behind the bulkhead partition.

Grounding Points
G2 Grounding point, behind the battery on the left-hand wheel housing.
G3 Grounding point, luggage compartment, on the left-hand side adjacent to the left-hand rear light cluster.
G8 Grounding point, dashboard, by the left-hand front loudspeaker socket.
G29 Grounding point, luggage compartment, on the right beside the right-hand rear light cluster.

DESCRIPTION OF OPERATION
The Cruise Control system consists of the following components:
^ Control module 508.
^ Vehicle speed sensor 132.
^ Cruise Control selector switch 141.
^ Pedal switched 133 (clutch, manual gearbox) and 134 (brakes).
^ Brake lights switch 29 or signal from TCS control module 507 for V6.

Control Module 508
The control module incorporates an electric stepping motor which mechanically regulates the cruise control cable. Current (+54 circuit) is supplied to pin F of the control module via fuse 2.

Vehicle Speed Sensor 132
The sensor continuously reads the speed and supplies this data to the control module via pin K.

Switch 141
The Cruise Control system is engaged by means of switch 141. The different positions of the switch are:

Position ON: Current is supplied to the control module via pin A.

Position SET: Current is supplied to the control module via pin B and the speed of the car is obtained from vehicle speed sensor 132.

Position TIP: Between ON and OFF on the switch is a TIP position. When this position is selected, the current supplied to pin A of the control module is cut off and the Cruise Control is disconnected. When the button is released, it springs back to the ON position, at which point current is again supplied to pin A of the control module.

Position RESUME: Restores the selected speed stored in the control module memory after either of pedal switches 133 and 134 has been activated. Current is supplied to control module pin C.

Pedal Switches 133 And 134
When the brake or clutch pedal is depressed, the current supplied to pin D of the respective pedal switch, 133 or 134, is cutoff and the Cruise Control system is disengaged.

Cars With Trionic
On cars equipped with the Trionic engine management system, terminal 36 of the Trionic control module receives a signal from pin J of the Cruise Control system's control module to the effect that the system is operative.

This results in smoother control of the vehicle's speed.

Automatic Transmission
When the selector lever is in one of the drive positions, switch 76 in selector lever 239 is closed. Pin D then receives a 12 V signal which enables the Cruise Control system to be activated. This means that the system will not be operative until the selector lever is in one of the drive positions.

Indicator Lamp 47u
Cars for certain markets are equipped with a CRUISE indicator lamp, 47u, which lights up when switch 141 is set to the ON position.

FAULT DIAGNOSIS HINTS
The Cruise Control system is activated by turning the ignition switch to the Drive position.

Position ON:
1. Check that fuse 2 is intact and supplied with current (manual gearbox).
2. Check that fuse 9 is intact and that current is supplied to it and to switch 76 (automatic transmission).
3. Check the current supplied to terminal 4 of switch 141 and terminal A of control module 508.
4. Check the current supplied to terminal 1 of vehicle speed sensor 132.

Position SET (spring-loaded):
1. Check the current supplied to terminal 2 of the switch and to terminal B of the control module.

Position RESUME (spring-loaded):
1. Check the current supplied to terminals 1 and 3 of the switch and to terminals A and C of the control module.
2. Check the connections, connectors and ground connections in the relevant wiring harness.