PRE-RELEASE
Airbag control module (331)
| Airbag control module (331) |
| Main function |
The control module monitors and controls all components included in the system. In the event of a collision, the control module activates the necessary circuits if the conditions are met.
| Type |
The control module contains two accelerometers. The primary accelerometer (1) measures acceleration and deceleration forces longitudinally and laterally. The secondary (1) accelerometer measures longitudinal acceleration and deceleration forces only.
The control module is equipped with a built-in backup power source which provides voltage for 150 ms after the normal power supply has been disconnected.
The function has three capacitors which maintain system voltage level and allow for front airbag deployment during the 150 ms interval. The side impact sensors are then disabled in order to save energy. During the time interval, bus communication occurs continuously.
| Power supply, ground and bus communication |
|
Pin no.
|
Signal type
|
Description
|
| 15 (K30) | Power supply +30 | Power supply from IPEC via fuse 24 |
| 1 (K30) | Ground | Grounding point G4 |
| 8, 9 (K30) | I-bus | Signal to/from other control modules |
Wiring diagram, power supply.
