Mitsubishi 2010 RVR Owner's Manual page 57

Seat and restraint systems
The seat belt pre-tensioner system includes the following com-
ponents:
2
1- SRS warning light
2- Front impact sensors
3- Seat belt pre-tensioner
4- Airbag control unit
5- Side impact sensors
The airbag control unit monitors the readiness of the electronic
parts of the system whenever the ignition switch or the opera-
tion mode is under the following conditions. These include all
of the items listed above and all related wiring.
[Except for vehicles equipped with the F.A.S.T.-key]
The ignition switch is in the "ON" or "START" position.
[Vehicles equipped with the F.A.S.T.-key]
The operation mode is in ON.
2-30
The seat belt pre-tensioners will operate under the same condi-
tions as the airbag control unit.
When the seat belt pre-tensioners activate, some smoke is
released and a loud noise will be heard. The smoke is not harm-
ful, but care should be taken not to intentionally inhale it, as it
may cause some temporary irritation to people with respiratory
problems.
The pre-tensioners activate whenever a moderate-to-serve
impact is applied to the front or side of the vehicle, even if the
seat belt is not being worn. The seat belt pre-tensioners may
not activate in certain collisions, even though the vehicle may
appear to be severely damaged. Such non-activation does not
mean that something is wrong with the seat belt pre-tensioner
system, but rather that the collision forces were not severe
enough to activate the system.
WARNING
!
The seat belt pre-tensioner system is designed to
work only once. After the seat belt pre-tensioners
have been activated, they will not work again. They
must promptly be replaced and the entire seat belt
pre-tensioner system inspected by an authorized
Mitsubishi Motors dealer.