Volvo 2008 V70 Owner's Manual page 23

In the event of a collision of this type, the hinges and brackets of the front seat backrests are designed to change
position slightly to allow the backrest/head restraint to help support the occupant's head before moving slightly
rearward. This movement helps absorb some of the forces that could result in whiplash.
WARNING
The WHIPS system is designed to supplement the other safety systems in your vehicle. For this system to function
properly, the three-point seat belt must be worn. Please be aware that no system can prevent all possible injuries that
may occur in an accident.
The WHIPS system is designed to function in certain collisions from the rear, depending on the crash severity,
angle and speed.
WARNING
Occupants in the front seats must never sit out of position. The occupant's back must be as upright as comfort allows
and be against the seat back with the seat belt properly fastened.
WARNING
If your vehicle has been involved in a rear-end collision, the front seat backrests must be inspected by a trained
and qualified Volvo service technician, even if the seats appear to be undamaged. Certain components in the WHIPS
system may need to be replaced.
Do not attempt to service any component in the WHIPS system yourself.
29
01 Safety
Safety in the passenger compartment
WARNING
Boxes, suitcases, etc. wedged behind the front seats could impede the function of the WHIPS system.
If the rear seat backrests are folded down, cargo must be secured to prevent it from sliding forward against the
front seat backrests in the event of a collision from the rear. This could interfere with the action of the WHIPS
system.