3239524 - E7030 AIRBAG - Functional description

Functional description

The Air Bag system control unit M60 receives a supply controlled by the ignition (INT) at pin 7 of connector A from the line protected by fuse F5 of the additional fuse box B98B . Pin 6 of connector A is connected to the special 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 13 and 14 of connector A):
  • to passenger side air bag Q11 (from pins 15 and 16 of connector A):
  • to the driver's pretensioner Q20 (from pins 13 and 14 of connector B) and the passenger pretensioner Q21 (from pins 15 and 16 of connector B).
Pin 11 of connector A is 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 1, 2, 3 and 4 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 17 and 18 of connector B);
  • to the passenger side Air Bag Q31 (from pins 19 and 20 of connector B);
  • to the driver's Window Bag Q40 (from pins 21 and 22 of connector B);
  • to the passenger Window Bag Q41 (from pins 23 and 24 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 17 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 12 of connector A of M60 sends the signal for the 'passenger Air bag disabled' warning light also located in the check instrument E30 . Self-diagnostic data can be read by connecting the unit to connector R10: it receives signals from pin 9 of connector A of the control unit M60 through the relevant tester line.