AIRBAG - FUNCTIONAL DESCRIPTION

Functional description

The Air Bag system control unit

M60 receives a supply controlled by the ignition (INT) at pin 12 of connector A from the line protected by fuse F50 of the additional fuse box B2.

Pin 1 of connector A and pins 17 and 22 of connector B are connected to a specific earth

C50.

A signal from passenger Air Bag disabling switch

H75 reaches pin 11 of connector A of M60;

pin 10 of connector A of

M60 provides the reference earth.

The side impact detection sensors

K66 (driver''s side) and K67 (passenger side) send signals to pins 24, 26, 25 and 27, respectively of connector B of the control unit M60.

When frontal impact of a certain severity (depending on the software setting) is detected, the control unit sends control signals to set off the modules:

• to driver''s Air Bag Q9, via the steering wheel clockspring D47 (from pins 24 and 23 of connector A of M60):
• to passenger side air bag Q11 (from pins 21 and 22 of connector A of M60):
• to the driver''s pretensioner Q20 (from pins 2 and 1 of connector B of M60) and the passenger pretensioner Q21 (from pins 4 and 3 of connector B of M60);

The seat structure that houses the two side bags is connected to earth

C50.

When the system self-diagnostic function detects a fault or an impact is detected, control unit

M60 sends a signal -from pin 8 of connector A - to the Air Bag faulty warning light located in the instrument panel E50.

; pin 7 of connector A of

M60 sends the signal for the ''passenger disabling'' warning light.

Self-diagnostic data can be read by connecting the unit to connector G of Body Computer

M1- pin 3: this receives signals from pin 6 of connector A of control unit M60 through the relevant tester line.

When side impact of a certain severity (dependent on the software setting) is detected, the control unit sends control signals to set off the modules:

• to driver''s Side Bag Q30 (from pins 6 and 5 of connector B of M60);
• to passenger Side Bag Q31 (from pins 9 and 10 of connector B of M60);
• to the driver''s Head Bag Q40 (from pins 8 and 7 of connector B of M60);
• to the passenger Head Bag Q41 (from pins 11 and 12 of connector B of M60).