Rear-End Collision
USA/CDN
Other
In the event of a rear-end collision, the supplemental restraint system module (SRS) (4/9) evaluates the force of the collision pulse. If the collision pulse is powerful enough, a deployment signal (current pulse) is sent to the front belt tensioners (8/33 and 8/34) and the front waist belt tensioner (8/92) (certain markets only). The belt tensioners are deployed.
The Supplemental restraint system module (SRS) also transmits an impact signal on a directly connected cable to the Central electronic module (CEM) (4/56) and Phone module (PHM) (16/60) (not USA/CDN) when the impact protection has been activated.
A collision status signal is also sent to the central electronic module (CEM) and phone module (PHM) (not USA/CDN) on CAN. These two control modules make sure that:
- switch off the fuel pump (FP)
- switch off the windshield wipers when the car is stationary
- turn off defrosting of windows and rearview mirrors if the vehicle is stationary
- light the interior lighting
- light the flashing hazard lights
- unlock the central locking system
- send an automatic alarm to CSC (Customer Service Center) when an accident has occurred - provided the vehicle is equipped with Volvo On Call (Plus).
- turn off the fuel engine heater