Impact Sensor: Description and Operation

SIDE IMPACT SENSOR (SIS)

DESCRIPTION




The release system for the side airbag consists of a HAE-3 installed in the middle of the vehicle and two satellites - one on the left-hand side and one on the right. Only the HAE-3 is capable of releasing the airbags or the seat-belt preten-pretensioners systems in the vehicle. In the dialog between the HAE-3 and the satellite, it is the HAE-3 which makes the release decision. The HAE-3 is supported in connection with the side airbag function by the two satellites, which act as intelligent acceleration sensors and as such back up the central airbag controller. Both the satellites continuously report the current system status on the left and right-hand sides of the vehicle to the HAE-3.

It monitors the acceleration sensor continuously. The test results are reported to the HAE-3 by means of periodic status signals.