3239525 - E7030 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 F5 of the additional fuse box B98B. Pin 1 of connector A and pins 17 and 32 of connector B are connected to a specific earth C50.

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, through a clockspring D47 (from pins 23 and 24 of connector A):
  • to passenger side air bag Q11 (from pins 21 and 22 of connector A):
  • to the front pretensioners on the driver's side Q20 (from pins 1 and 2 of connector B) and the passenger side Q21 (from pins 3 and 4 of connector B).
Pins 10 and 11 of connector A are connected to the passenger Air Bag disabling switch H75. 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 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 the driver's side Air Bag Q30 (from pins 5 and 6 of connector B);
  • to the passenger side Air Bag Q31 (from pins 9 and 10 of connector B);
  • to the driver's Window Bag Q40 (from pins 7 and 8 of connector B);
  • to the passenger Window Bag Q41 (from pins 11 and 12 of connector B).
The two side Air Bags are 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 check instrument E30. This signal causes the warning light to come on because the instrument E30 supply is controlled by the ignition (INT) from the line protected by fuse 4 of the additional fuse box B98B . Similarly, pin 7 of connector A of M60 sends a signal for the 'passenger Air Bag disabled' warning light located in the check panel E30. 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.