Air Bag Systems: Description and Operation

The air bag diagnostic unit receives its main power from the AIRBAG fuse and reserve power from the RADIO fuse. Two collision sensitive sensors in the air bag diagnostic unit are in series with each other and with the battery and both air bag module. When both sensors close simultaneously, squibs in both air bag modules will be initiated. The air bag diagnostic unit also contains a back-up power supply and a self-diagnostic function.