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FUNCTIONAL DESCRIPTION

The control unit for airbag system M060 receives an ignition-operated power supply (INT) at pin 2 of connector A from the line protected by fuse F50 of the Body Computer M001.

Pin 1 connector A is connected to the specific earth C050.

The "early crash" sensor K039 detects light impacts and communicates them to the control unit M060 - pins 11 and 12 of connector A of M060.

When, according to the control logic, the two sensors and the sensors incorporated into the actual control unit detect a slight frontal impact, the control unit sends signals for the intervention of the front modules in the first stage:

- to the driver's Airbag Q009, via the clock spring on the steering wheel D047 (from pins 15 and 16 of connector A of M060);

- to the passenger Airbag Q011 (from pins 13 and 14 of connector A of M060);

- to the driver side knee bag Q014 (from pins 23 and 24 of connector A of M060);

- to the driver's side front pretensioners Q020 and Q024 (from pins 15-16 and 20-21 of connector B of M060)

- to the passenger side front pretensioners Q021 and Q025 (from pins 13-14 and 18-19 of connector B of M060).

If a more serious frontal impact is detected, the control unit sends signals for the intervention of the front modules in the second stage:

- to the driver's Airbag Q009, via the clock spring on the steering wheel D047 (from pins 19 and 20 of connector A of M060);

- to the passenger side airbag Q011 (from pins 17 and 18 of connector A of M060).

The side impact detection sensors K066 (driver's side) and K067 (passenger side) send signals to pins 25-24 and 22-23 respectively of connector B of control unit M060.

When, on the basis of the control logic, a side impact of a certain severity is detected, the control unit sends signals for the intervention of the modules:

- to the driver's front Side Bag Q030 (from pins 11 and 12 of connector B of M060);

- to the passenger side front Side Bag Q031 (from pins 9 and 10 of connector B of M060);

- to the driver's side Head Bag Q040 (from pins 3 and 4 of connector B of M060)

- to the passenger side Head Bag Q041 (from pins 2 and 1 of connector B of M060).

The structure of the seats which house the side bags is connected to earth C050

The switch on the front driver's seat belt I046 and the passenger seat belt I047 are connected to the control unit at pins 26 and 28 of connector B of M060 respectively, whilst pin 27 provides the reference earth.

The passenger presence sensor K065 interrupts the seat belt signal if there is no passenger.

The switches on the rear seat belts I145, I146 and I147 are connected to the control unit at pins 32, 29 and 31 respectively of connector B of M060; pin 30 provides the reference earth.

The control unit M060, from pins 7 and 8 of connector A, is connected, via the CAN line, to the Body Computer M001 and to the instrument panel E050.

When the system's self-diagnosis function detects a fault or an impact is recorded, the control unit M060 sends a signal, via the CAN, for the "airbag failure" warning light located in the instrument panel E050.

Similarly, it lights up the passenger side airbag disabled warning light and the seat belts not fastened warning light.

The LIN serial line leaves pin 4 of the instrument panel E050 connecting with the seat belts not fastened display located near the interior rear view mirror.