Function In The Event Of A Frontal Impact
In the event of frontal collision a function called multi point detection is used. The collision pulse is registered at several points. This function is integrated in the supplemental restraint system module (SRS) (4/9) and is called a collision sensor. When the collision pulse is sufficiently large an activation signal (current pulse) is transmitted to the front airbags and/or the seat belt tensioners. The frontal collision sensors (7/178, 7/179) are also part of multi point detection in the control module. They register the collision pulse and transmit acceleration data to the control module indicating the size of the collision pulse. The driver (8/30, 8/61) and front passenger (8/31, 8/32) airbags are deployed. The seat belt tensioners for the front (8/33, 8/34), rear (8/55, 8/56 and 8/62) and third row of seats (8/94, 8/95) are activated.
When the collision protection system has been activated a collision signal is transmitted from the supplemental restraint system module (SRS) (4/9) to the central electronic module (CEM) (4/56) and phone module (PHM) (16/60) on a directly connected cable. These two control modules ensure that:
- the central locking system is unlocked
- the fuel pump (FP) is switched off
- the interior lighting is lit
- the warning lamps are lit
- the collision pulse is registered
- an automatic alarm is sent to CSC (customer service center), and to Volvo On Call (Plus) if applicable.