Head-On Collision (Not USA/Can)

Fig 1: Identifying Multi-Point Detection Function (Not USA/CAN)

Courtesy of VOLVO CARS CORPORATION

In the event of a head-on collision, a function called multi-point detection is used. 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 is sufficiently large, a deployment signal (current pulse) is sent to:

• front airbags (8/123 and 8/124) and/or
• belt tensioners (8/33, 8/34, 8/55, 8/56, 8/62 and 8/92) and, if necessary, to
• the inflatable curtains (8/66 and 8/67).

The front collision sensors (7/178 and 7/179) (not XC60)are also included in the multi-point sensing in the control module. They register the collision pulse and send acceleration data to the control module.

Airbags driver and passenger front are activated. Belt tensioners are activated.

Inflatable curtains on driver's side are activated. (2008-).

The passenger airbag will not be activated if it is deactivated with the switch (3/157).

When impact protection has been deployed, the supplemental restraint system module (SRS) sends a collision signal to the central electronic module (CEM) (4/56) and phone module (PHM) (16/60) via a directly connected cable. A collision status signal is also sent to the central electronic module (CEM) and phone module (PHM) on the CAN network. These to control modules ensure 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

Supplemental restraint system module (SRS) receives continuous information from Closing velocity module (CVM) (4/125) (only XC60). With laser Closing velocity module (CVM)detects if the vehicle is about to collide with an object in front. Information is used by Supplemental Restraint System Module (SRS) to get an early indication that the vehicle is about to collide, which helps to decide what type of action is needed.