3315760 - E7030 AIRBAG - Functional description (Air Bag laterale)

Functional description

The airbag system control unit M60 is supplied with power when the ignition switch is turned on (INT/A) at pin 5 by a line protected by fuse F2 in junction unit B1 . Pin 6 is connected to the 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 airbag Q9 , through a clockspring on the steering wheel Q10 (from pins 11 and 10):
• to the passenger airbag Q11 (from pins 13 and 14);
• to the pretensioners on the driver's side Q20 (from pins 1 and 2) and the passenger side Q21 (from pins 3 and 4).

Pins 15 and 37 are connected to a sensor in the seat for disablement of the passenger airbag K65 . Pins 25 and 12 are connected to the passenger airbag disablement switch H75 . Side impact detection sensors K66 (driver's side) and K67 (passenger side) send signals to pins 20, 22 and 21, 23 respectively of control unit M60 . The two side sensors are connected to earth C50.

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 sidebag Q30 (from pins 16 and 17):
• to the passenger side Air Bag Q31 (from pins 18 and 19);

When the system self-diagnostic function reveals a fault or an impact is detected, pin 40 of control unit M60 sends a signal to the airbag fault warning light located on control panel E50 . - pin 9 of connector C. Pin 33 of M60 sends a signal to the passenger sidebag disablement warning light, again located on instrument panel E50 - pin 16 of connector C. These signals are earthed and turn on the warning lights since instrument E50 is ignition-activated (INT/A) - pin 15 of connector A - from a line protected by fuse F1 of junction unit B1 . Both warning lights are of the type known as 'smart' warning lights because an inner control circuit causes the warning light to light up even if the connection is broken or if the circuit connecting warning light and control unit is short-circuited to earth. Self-diagnostic data may be read by connecting the unit to connector R10 : this receives signals from pin 9 of control unit M60 through the appropriate tester line.