3308554 - 5580C air bag system

DESCRIPTION

The vehicle is fitted with an Air Bag system and seat belts with electronically controlled pre-tensioners which may have:

  • "4 charges" (fitted as standard)
  • "6 charges" (optional).
In the case of a frontal impact of a certain severity, those versions with 4 charges activate the front seat belt pre-tensioners and the front Air Bags.In the case of a side impact of a certain severity, those versions with 6 charges also activate the Side Bags.It is possible to deactivate the front passenger Air Bag manually via a pecial switch.

A sensor in the seat automatically deactivates:

  • the front passenger Air Bag
  • the passenger pre-tensioner
  • the passenger Side Bag (where fitted)

The system consists of the following components:

  • Electronic cotnrol unit
  • Driver's Air Bag
  • Passenger Air Bag
  • driver's seat belt pretensioner
  • front passenger seat belt pretensioner
  • switch for disabling passenger Air Bag
  • sensor for automatically disabling passenger Air Bag/Side Bag and pretensioner
  • satellite senor for driver's Side Bag (where fitted)
  • satellite sensor for passenger Side Bag (where fitted)
  • Driver's Side Bag (where fitted)
  • Passenger Side Bag (where fitted)

The system is connected with the:

  • diagnostic socket for checking the system with the Examiner or other diagnostic equipment
  • warning light in the instrument panel for signalling faults
  • warning light in the instrument panel for signalling passenger Air Bag disabled.
The system components are interconnected and are connected to the rest of the electrical equipment by means of special wiring which can be easily recognized as it ha a yellow coloured outer casing.
When operations are carried out to the Air Bag system the recommended safety instructions must be followed precisely. For more details  See assembly 5580C   air bag system .
1, Electronic control unit 2, Driver's Air Bag 3, Passenger Air Bag 4, Driver's seat belt pretensioner 5, Passenger seat belt pretensioner 6, Switch disabling passenger Air Bag 7, Passenger Air Bag/Side Bag and pretensioner automatic disabling sensor 8, Diagnostic socket for checking the system 9, Warning light in the instrument panel for signalling faults 10, Warning light in the instrument panel for signalling passenger Air Bag disabling 11, Driver's Side Bag satellite sensor (where fitted) 12, Passenger Side Bag satellite senor (where fitted) 13, Driver's Side Bag (where fitted) 14, Passenger Side Bag (where fitted) Components 11 - 12 - 13 - 14 are only fitted on versions with Side Bags.

ELECTRONIC CONTROL UNIT FOR SYSTEM WITH 4 CHARGES

An electronic control unit manages the entire system checking all the components and activating the retaining systems (pretensioners and Air Bags), when necessary.

Operation

There is a longitudinal electronic accelerometer sensor inside the control unit whose signal, suitably processed by a microprocessor, makes it possible to determine the extent of an impact and, consequently, to decide whether to activate the pretensioners and the Air Bags.A second longitudinal electro-mechanical sensor, with a safety function, gives the go ahead.

The control unit has two different intervention levels:

  • at the first level the system activates the pretensioners only
  • at the second level the system activates both the pretensioners and the Air Bags.
The control unit only detects frontal impacts. In the case of side impacts, collisions or the vehicle overturning, it does not activate the system.

Location

The control unit is located under the centre console and is rigidly fixed to the bodyshell: in this way the deceleration sensors, located inside it, are close to the centre of gravity and detect the deceleration iof the entire vehicle accurately.
The control unit should always be fitted with the arrow facing the direction in which the vehicle is travelling.
1, Electronic control unit 2, Arrow indicating the direction of travel 3, Fixings 4, Electrical connection

Control unit specifications

The control unit receives a 12 V supply with the ignition in the ON position, but it is capable of working for a further 220 msec approx. after the supply is cut off.This is possible thanks to the presence of a buffer condenser which accumulates sufficient electrical energy to produce the Air Bag activating signal.The operation of the system is thereby also guaranteed even if the impact causes a fall in the system voltage (e.g. battery damaged or broken, break in the supply cables, etc.).Whilst the vehicle is running, the electronic control unit continuously carries out the system fault diagnosis, checking the continuity of the circuit and the components.If a fault is detected it is memorized and the "Air Bag failure warning light in the instrument panel comes on.The fault memory can be consulted by connecting the diagnostic equipment (Examiner or S.D.C.) to the diagnostic socket, as described below.The control unit microprocessor carries out complex calculation algorhythms for the signal coming from the accelerometer sensor and determines the severity of the impact. According to the severity level and, with the go ahead of the safety sensor, a signal is sent to activate the Air Bags.This activation order is stored in a special crash memory which contains information relating to the exceeding of the intervention thresholds and the go ahead for the safety sensor.

Control unit pin-out

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30-way connection: 1, Driver's Air Bag Activation (-) 2, Driver's Air Bag activation (+) 3, Passenger Air Bag activation (-) 4, Passenger Air Bag activation (+) 5, Passenger Air Bag disabling device (-) 6, Passenger pretensioner activation (+) 7, Passenger pretensioner activation (-) 8, Earth for fault diagnosis (Not connected) 9, Diagnostic line K 10, Driver's pretensioner activation (+) 11, Driver's pretensioner activation (-) 12, Not Connected 13, Air Bag system failure warning light signal 14, Earth 15, Supply controlled by the ignition + 15 16, Driver's Air Bag short circuit 17, Driver's Air Bag short circuit 18, Passenger Air Bag short circuit 19, Passenger Air Bag short circuit 20, Passenger Air Bag disabling warning light signal (-) 21, Passenger pretensioner short circuit 22, Passenger pretensioner short circuit 23, Not connected 24, Passenger Air Bag disabling device (+) 25, Driver's pretensioner short circuit 26, Driver's pretensioner short circuit 27, Passenger presence sensor signal (-) 28, Failure warning light short circuit 29, Earth short circuit 30, Passenger presence sensor signal (+)

ELECTRONIC CONTROL UNIT FOR SYSTEM WITH 6 CHARGES

An electronic control unit manages the entire system checking all the components and activating the systems (pretensioners, Air Bags, Side Bags), when necessary.

Operation

There is a longitudinal electronic accelerometer sensor inside the control unit whose signal, suitably processed by a micropocessor, makes it possible to determine the severity of an impact and consequently decide whether or not to activate the pretensioners and Air Bags.A second longitudinal electro-mechanical sensor, which has a safety function, gives the go ahead for the activation.

The control unit has two different levels of intervention for a frontal impact:

  • at the first level only the pretensioners are activated
  • at the second level both the pretensioners and the Air Bags are activated.
A third transverse electronic accelerometer sensor with a safety function gives the go ahead to trigger the left or right Side Bag.

Location

The control unit is located under the centre console and is rigidly fixed to the bodyshell: in this way the deceleration sensors located inside it are close to the centre of gravity and detect deceleration for the entire vehicle accurately.
The control unit should always be fitted with the arrow pointing in the direction the vehicle is travelling in.
1, Electronic control unit 2, Arrow indicating the direction of travel 3, Fixings 4, Electrical connection

Control unit specifications

The control unit receives a 12 V supply with the ignition in the ON position, but it still operates for a further 220 msec approx after the supply is cut off.This is made possible thanks to the presence of two separate buffer condensers which accumulate sufficient electrical energy to produce the signal for activating the Air Bags and the Side Bags.The operation of the system is therefore guaranteed even if the impact causes a fall in the system voltage (e.g. battery damaged or broken, break in the supply cables, etc.).Whilst the vehicle is running, the electronic control unit continously carries out the system fault diagnosis, constantly checking the circuit and components.If a fault is detected it is memorized and the "Air Bag failure" warning light in the instrument panel comes on at the same time.The failure memory can be consulted by connecting the diagnostic equipment (Examiner or S.D.C.) to the diagnostic socket, as described below.The control unit microprocessor carries out complex calculation algorhythms for the signal coming from the accelerometer sensor and determines the severity of the impact. According to the severity and, with the go ahead of the safety sensor, it sends a signal to activate the Air Bags.This activation order is stored in a special crash memory which contains information relating to the exceeding of the intervention thresholds and the go ahead for the safety sensor.

Control unit pin-out

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1, Driver's pretensioner activation (+) 2, Passenger pretensioner activation (-) 3, Passenger pretensioner activation (+) 4, Passenger pretensioner activation (-) 5, Supply controlled by the ignition 6, Earth 7, Not connected 8, Not connected 9, Diagnostic line K 10, Driver's Air Bag activation (+) 11, Driver's Air Bag activation (-) 12, Passenger Air Bag disabling device (+) 13, Passenger Air Bag activation (+) 14, Passenger Air Bag activation (-) 15, Passenger presence sensor signal 16, Driver's Side Bag activation (+) 17, Driver's Side Bag activation (-) 18, Passenger Side Bag activation (+) 19, Passenger Side Bag activation (-) 20, Driver's side sensor signal 21, Passenger side sensor signal 22, Driver's side sensor supply 23, Passenger side senor supply 24, Earth for fault diagnosis 25, Passenger Side Bag disabling device (-) 26, Driver's pretensioner short circuit 27, Driver's pretensioner short circuit 28, Passenger pretensioner short circuit 29, Passenger pretensioner short circuit 30, Not connected 31, Earth short circuit 32, Short circuit 33, Air Bag OFF warning light 34, Not connected 35, Driver's Air Bag short circuit 36, Driver's Air Bag short circuit 37, Passenger presence sensor signal 38, Passenger Air Bag short circuit 39, Passenger Air Bag short circuit 40, Air Bag system failure wrning light signal 41, Driver's Side Bag short circuit 42, Driver's Side Bag short circuit 43, Passenger Side Bag short ci
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