E7030 AIRBAG - FUNCTIONAL DESCRIPTION - Fiat - MULTIPLA - eLearn

2892671 - E7030 AIRBAG - Functional description

Functional description

The control unit for the Air Bag system M60 is controlled by the ignition (INT) at pin 12 from the line protected by shunt fuse B32. Pin 1 of connector A is connected to the special earth C50, as are pins 17 and 32 of connector B. The side impact detection sensors K66 (driver's side) and K67 (passenger side) send signals to pins 24-26 and 25-27 respectively of connector B of the control unit M60.

When a frontal impact of a certain severity (depending on the control strategy, data from the above two sensors and sensors incorporated in the control unit) is detected, the control unit sends control signals to operate the front modules:

to driver's Air Bag Q9, via the steering wheel clockspring D47 (from pins 23-24 of connector A of M60) in the case of first stage activation;
to driver's Air Bag Q9, via the steering wheel clockspring D47 (from pins 19-20 of connector A of M60) in the case of second stage activation;
to the outer passenger Air Bag Q12 and the inner bag Q13 (from pins 21-22 and 17-18 of connector A of M60);
to the driver's pretensioner Q20 (from pins 1-2 of connector B of M60) and the passenger pretensioner Q21 (from pins 3-4 of connector B of M60).

A signal from passenger Air Bag disabling switch H75 reaches pin 11 of connector A of M60, supplied from pin 10 of connector A of M60.

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 5-6 of connector B of M60);
to passenger side bag Q31 (from pins 9-10 connector B of M60);
to driver's rear side bag Q43 (from pins 13 and 14 of connector B of M60);
to passenger side rear air bag
to the driver's window bag Q40 (from pins 7-8 of connector B of M60);
to the passenger window bag Q41 (from pins 11-12 of connector B of M60).

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 fault warning light located in instrument panel E50 - pin 27 of connector A.

the 'Air Bag fault' warning light is a so-called 'intelligent' warning light: thanks to a special operating circuit inside the instrument, it comes on, not only to signal a fault in the Air Bag system, but also if there is no connection or a short circuit to earth in the circuit which connects the instrument with the control unit.

When the passenger Air Bag is disabled, the control unit M60 sends a signal, from pin 7 of connector A, to the 'passenger Air Bag deactivation' warning light, located in the instrument panel E50 - pin 28 of connector A. These signals are earthed and turn on the warning lights since instrument E50 is ignition-activated (INT/A) - pin 19 of connector A - from a line protected by fuse F1 of junction unit B1. Self-diagnostic data can be read by connecting the unit to connector R10: it receives signals from pin 6 of connector A of the control unit M60 through the relevant tester line.