System Diagram

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OElectrically Operated Hood (TSAS) (Part 1 Of 2):

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OElectrically Operated Hood (TSAS) (Part 2 Of 2):

WIRING DIAGRAM

Electrically Operated Hood (TSAS) - Component Location (Part 1 Of 2):

Electrically Operated Hood (TSAS) - Component Location (Part 2 Of 2):

COMPONENT LOCATION
22A Main fuse board in the dashboard.
55 Luggage compartment light.
188 Central locking motor in boot lid.
289 Control module, central locking, under left-hand front seat.
388 Switch, electrically operated boot lid release, on the driver's door.
445 Data link connector below the steering
H16-1 wheel.
501 Main fuse board, maxi fuses, behind the battery.
541 SID unit on the dashboard.
547 ABS control module integrated with the brake unit, behind the battery.
561A Microswitch in the hood's left-hand latch fitting on the windshield frame.
561B Microswitch in the hood's right-hand latch fitting on the windshield frame.
562A Microswitch in the tonneau cover's left-hand latch.
562B Microswitch in the tonneau cover's right-hand latch.
563A Microswitch in the fifth bow's left-hand latch.
563B Microswitch in the fifth bow's right- hand latch.
564A Microswitch for hood stowage bag's left-hand side.
564B Microswitch for hood stowage bag's right-hand side.
565 TSAS control module above left-hand rear wheel housing.
566 Hood position sensor, by left-hand main motor.
567 Tonneau cover position sensor, by tonneau cover motor.
568 Fifth the bow position sensor, by fifth bow's right-hand motor.
569 Fifth bow latch motor, on underside of tonneau cover.
570 Tonneau cover motor in luggage compartment on the right-hand side.
571A Fifth bow left-hand motor, by the fifth bow's left-hand mounting.
571B Fifth bow right-hand motor, by the fifth bow's right-hand mounting.
572 Emergency hood operation switch, behind the backrest.
573 Emergency hood operation switch, behind the backrest.
574A Left-hand main motor (hood), by the left-hand mounting.
574B Right-hand main motor (hood), by the right-hand mounting.

2-pin connectors
H2-10 By the tonneau cover motor.
H2-11 By the fifth bow latch motor.
H2-12 By the fifth bow's right-hand motor.
H2-13 By the fifth bow's left-hand motor.
H2-14 By the right-hand main motor.
H2-15 By the left-hand main motor.

3-pin connectors
H3-4 By the microswitch for left-hand hood latching.
H3-5 By the microswitch for right-hand hood latching.
H3-6 By the microswitch in the tonneau cover's left-hand latch.
H3-7 By the microswitch in the tonneau cover's right-hand latch.
H3-8 By the microswitch in the fifth bow's left-hand latch.
H3-9 By the microswitch in the fifth bow's right-hand latch.
H3-10 By the microswitch for the hood stowage bag's left-hand side.
H3-11 By the microswitch for the hood stowage bag's right-hand side.
H3-12 By the hood position sensor.
H3-13 By the tonneau cover position sensor.
H3-14 By the fifth bow position sensor.
H3-15 In the luggage compartment, on the left-hand side.

4-pin connector
H4-5 In the luggage compartment behind the left-hand wheel housing.

1O-pin connectors
H10-2 On the connector bracket below the left-hand A pillar.
H10-15 In the luggage compartment above the left-hand wheel housing.

26-pin connectors
H26-1 Connector, driver's door, LHD
H26-3 Connector, driver's door, RHD

33-pin connectors
H33-1 Grey connector on the bracket below the left-hand A pillar.
H33-3 Blue connector on the bracket below the left-hand A pillar.

Grounding Points
G3 Grounding point, luggage compartment, below left-hand rear light cluster.
G36S Grounding point (signal) by the left- hand secondary B pillar..


DESCRIPTION OF OPERATION
The Top Stack Actuation System (TSAS) hood system raises and lowers the hood when the circuit is closed by the "ROOF" switch.

The control module activates the electric motors for operating the hood at the same time as it senses, by means of the position sensors (potentiometers), that the movements are performed in the right order. On completion of the raising or lowering sequence of movements, confirmation is obtained via microswitches that the hood is latched at front and rear and that the tonneau cover is latched to the body.

Should any fault arise, movement of the hood will be stopped. At the same time a signal is sent to the SID, which sounds an acoustic warning and displays a fault message.

The hood can be operated only when the car is stationary.

Control Module 565
The control module monitors and controls the hood and electric window lifts as well as the electric boot lid release.

The Control Module Obtains Information From:
^ The main motor's position sensor (potentiometer) 566
^ The tonneau cover's position sensor (potentiometer) 567
^ The fifth bow's position sensor (potentiometer) 568
^ Microswitches in windshield frame latches 561A and B
^ Microswitches in tonneau cover latches 562A and B
^ Microswitches in fifth bow latches 563A and B
^ Microswitches in hood stowage bag latches 564A and B
^ Switch, window lifts/hood 386
^ Luggage compartment light 55
^ Boot lid latch switch 188
^ Switch, luggage compartment light 388
^ ABS control module 547
^ Emergency operation handles 572 and 573
^ Data link connector 445

The Control Module Sends Information To The Following Units:
^ Fifth bow latch motor 569
^ Tonneau cover motor 570
^ Fifth bow motors 571A and B
^ Main motors 574A and B
^ Side instrument 541
^ Window lift motors 164/165 and 193/194
^ Luggage compartment lock 188
^ Data link connector 445

Power Supply
The system is supplied with current from the +15 circuit on pin 9 via fuse 19 or fuse 17 when the ignition switch is in the Start or Drive position and with current from the +30 circuit on pin 20 from the battery via maxi fuse 5 in the main max-fuse board. All the motors are supplied with power via this fuse.

Grounding
The control module's power ground is connected via pin 10 to grounding point G3 and its signal ground via pin 18 to grounding point G36S.

Automatic Climate Control (ACC)
On cars equipped with ACC the ACC system will not be operative when the hood is down but reverts to manual operation.

Boot Lid
Releasing the boot lid by means of the button in the driver's door is possible only when:
^ the hood is completely raised (up)
^ the hood is completely lowered (down) and the ignition switched ON.

If the boot lid is open it will not be possible to operate the hood.

Window Lifts
The window lifts are controlled via the TSAS control module, see Electric window lifts.

When the hood is raised, the control module lowers the windows a centimeter or two.

The window lifts cannot be operated while the hood is being raised.

Main Motors 574
Two d.c. motors are used to raise and lower the hood. For raising the hood they are supplied with 12 Volts from control module pin 1 (K20) and for lowering it with 12 Volts from pin 11 (K20). If the motors are blocked they are protected from overloading by a current limiting circuit in the control module.

Fifth Bow Motors 571
Two d.c. motors are used to raise and lower the fifth bow. For raising it they are supplied with 12 Volts from control module pin 13 (K20) and for lowering it with 12 Volts from pin 14 (K20). If the motors are blocked they are protected from overloading by a current limiting circuit in the control module.

Fifth Bow Latch Motor 569
A d.c. motor is used to open and close the latches securing the fifth bow to the tonneau cover. For latching it the motor is supplied with 12 Voltsfrom control module pin 12 (K20) and for unlatching it with 12 Voltsfrom pin 2 (K20).

Tonneau Cover Motor 570
A d.c. motor is used to raise and lower the tonneau cover. For raising it the motor is supplied with 12 Volts from control module pin 16 (K20) and for lowering it with 12 Volts from pin 17 (K20). If the motor is blocked it is protected from overloading by a current limiting circuit in the control module.

Position Sensors
Potentiometers are used as position sensors to provide the control module with information on the exact positions of the hood, fifth bow and tonneau cover.

Potentiometer pin 1 is supplied with 5 Volts from control module pin 15 (K42).

Pin 3 of the potentiometer is connected to ground via control module pin 29 (K42).

The position signal goes from potentiometer pin 2 to the appropriate input on the control module.

To prevent corrosion of the connector contacts, a burn-off function is initiated each time the ignition is switched ON.

Note: After any work carried out on the hood system involving removal of the control module, any of the potentiometers or the hood itself, the end positions of the potentiometers will have to be reprogrammed in the control module. This should also be done after adjustment of the hood or tonneau cover has been performed.


Main Motor Position Sensor 566
A potentiometer is located by the left-hand main motor. Pin 2 of this potentiometer is connected to pin 30 (K42) of the control module.

Fifth Bow Position Sensor 568
A potentiometer is located by the right-hand motor. Pin 2 of this potentiometer is connected to pin 31 (K42) of the control module.

Tonneau Cover Position Sensor 567
A potentiometer is located by the tonneau cover motor. Pin 2 of this potentiometer is connected to pin 32 (K42) of the control module.

Microswitches
Pins 1 and 3 of the microswitches are connected to common control module power outputs. Pin 2, the voltage of which indicates the position of the microswitch, is connected to the appropriate control module input. When a microswitch is activated, pin 2 will be connected to pin 3. When it is not activated, pin 2 will be connected to pin 1.

Microswitches 561 In The Windshield Frame Latches
These indicate whether or not the hood is mechanically latched to the windshield frame.

Microswitches 562 In The Tonneau Cover Latches
These indicate whether or not the tonneau cover is latched to the body.

Microswitches 563 In The Fifth Bow Latches
These indicate whether or not the fifth bow is latched to the tonneau cover. The right-hand microswitch has been discontinued during the model year.

Microswitches 564 On The Hood Stowage Bag
These indicate whether or not the hood stowage bag is in its lowest position.

Switches 572/573 For Emergency Hood Operation
It is not normally possible to operate the hood or tonneau cover by hand.

An emergency hood operation handle is situated on the right-hand side behind the rear seat backrest. Raising it activates switches 572 and 573 which disconnect the circuit between the control module and main motors and the fifth bow motors. In addition, the tonneau cover motor is disconnected mechanically from the tonneau cover.

Vehicle Speed Signal
A vehicle speed signal is sent from ABS control module pin 19 (RH rear wheel) to TSAS control module pin 12 (K42).

SID 541
If certain faults occur during operation of the hood, the control module will send a signal to the SID unit on the nature of the fault. The following fault messages may be displayed by the SID:
^ TOP CYCLE ERROR
^ INSPECT HOOD LATCHING
^ CHECK TRUNK
^ CLOSE TRUNK


FAULT DIAGNOSIS HINTS
Use an Intelligent Saab Tester scan tool for fault diagnosis and obtaining readouts of diagnostic trouble codes.