Front-End Collision (Only USA/CDN)
In case of a front-end collision a function is used that is called multi-point sensing. This means that the collision pulse is registered at several points. This function is integrated in the Supplemental restraint system module (SRS) (4/9). When the collision pulse becomes adequately high an activation signal, a current pulse, is sent to front airbags (8/30, 8/31, 8/32 and 8/61) and/or seat belt tensioners (8/33, 8/34, 8/55 and 8/56). The front impact sensors (7/178 and 7/179) are also included in the multi-point sensing in the control module. They register the collision pulse and send out acceleration data to the control module. Driver and front passenger airbags are activated. Seat belt tensioners front are activated. In case of a front-end collision where front airbags and front seat belt tensioners have deployed, the function for adaptive seat belt force limitation (see below) can also be activated. When the driver airbag is activated and the driver is wearing the seat belt, the control module sends an activation signal, a current pulse, to the adaptive steering column (8/99). The Occupant weight sensor (OWS) (7/93) is used to activate/deactivate the passenger airbag.
A collision signal is transmitted on a direct connection from the supplemental restraint system module (SRS) to the central electronic module (CEM) (4/56) and phone module (PHM) (16/60) when the collision protection system is activated. These two control modules ensure that:
- the central locking system is unlocked
- the fuel pump (FP) is switched off
- windshield wipers are turned off if the vehicle is stationary
- interior lighting is activated
- warning lights are activated
- the collision pulse is registered
- an automatic alarm is sent to CSC (customer service center) if the vehicle is equipped with Volvo On Call (Plus).