Starting System: Overview Saab 9-5 I рестайлинг 2

Scheme 1

Scheme 2

1. Unplug the negative battery cable.
2. Remove the upper engine cover and the sound insulation.
3. Remove the upper starter motor bolts.
4. Remove the bracket from the coolant pipe and the positive cable clamp.
5. Remove the starter motor connecting cables.
6. Raise the car.
7. Remove the lower engine cover.
8. Remove the lower starter motor bolt.
9. Lower the starter motor and lift it out.

Operation

When the correct ignition key is put in the ignition, the transponder sends a code to TWICE which grounds the starting relay actuating coil.

When the ignition is turned to the start position, the starting relay is activated and the operating circuit to solenoid terminal 50 closes. The solenoid engages the pinion with the ring gear on the engine flywheel and closes a switch so that the starter motor commutator is supplied with power via the slip brushes from terminal 30.

Once the engine has started and the engine speed has exceeded the starter motor rpm, the pinion is disengaged from its shaft via a free wheel, preventing the starter motor from overrevving. Releasing the ignition key breaks the starting circuit and the operating circuit to the solenoid, whereby a spring returns the pinion to its rest position.

Scheme 3

The operating circuit runs from the battery's positive terminal to the ignition switch and on to the starting relay, and via the starting relay to terminal 50 on the starter motor, which is the operating current connection on the solenoid.

The clutch pedal must be depressed on cars for the US/CA market if the starter relay contacts are to receive current.

The starting relay actuating coil is grounded via the TWICE control module when it has received the ready signal from the immobilizer unit.

Scheme 4

The operating circuit runs from the battery's positive terminal to the ignition switch and on to the starting relay, and via the starting relay to terminal 50 on the starter motor, which is the operating current connection on the solenoid.

The selector lever must be in position P or N if the starter relay coil is to receive current.

The starting relay actuating coil is grounded via the TWICE control module when it has received the ready signal from the immobilizer unit.

Scheme 5

As standard, the car is fitted with a system that prevents the car from being started without the correct key. There is a transponder in the key with an identification code that is unique for that particular transponder. A receiver fitted round the ignition switch receives the transponder's identification code and sends it on to TWICE, which recognizes the car's transponders. In the event of an incorrect transponder being used, TWICE outputs an error message on the bus.

For more information about the TWICE control module, see SYSTEM OVERVIEW , TWICE .

For more information about Immobilization, see SYSTEM OVERVIEW , IMMOBILIZER .