Suzuki 2007 XL7, Руководство по обслуживанию

Страница: 2014 / 3159

8B-2 Air Bag System:
General Description
SIR System Description and Operation
SIR System Overview
The supplemental inflatable restraint (SIR) system
supplements the protection offered by the occupants
Seat Belt System (2). The SIR system may contain
several inflator modules located throughout the vehicle,
i.e. steering wheel module (1), instrument panel (I/P)
module (1), or roof rail modules. In addition to inflator
modules, the vehicle may contain seat belt
pretensioners that tighten the seat belt in the event of a
collision, thus reducing the distance between the
occupant and the seat belt when an inflator module is
deployed. Each inflator module has a deployment loop
that is controlled by the sensing and diagnostic module
(SDM) mounted inside the vehicle. The SDM determines
the severity of a collision with the assistance of various
sensor inputs located at strategic points on the vehicle.
When the SDM detects a collision, it will process the
information provided by the sensors to further support air
bag or pretensioner deployment. The SDM will deploy
the frontal air bags and pretensioners if it detects a
collision of sufficient force. If the force of the impact is
not sufficient to warrant inflator module deployment, the
SDM may still deploy the seat belt pretensioners. The
SDM performs continuous diagnostic monitoring of the
SIR system electrical components. Upon detection of a
circuit malfunction, the SDM will set a DTC and inform
the driver by turning the AIR BAG indicator ON. The
steering column (1) and knee bolsters (3) are designed
to absorb energy and compress during frontal collisions
in order to limit leg movement and decrease the chance
of injury to the driver and passenger.
Frontal SIR System Description
The frontal supplemental inflatable restraint (SIR)
system consists of the following components:
• AIR BAG indicator located in the instrument panel
cluster (IPC)
• Inflatable restraint sensing and diagnostic module
(SDM)
• Inflatable restraint passenger presence system (PPS)
• Inflatable restraint Passenger AIR BAG ON/OFF
indicator
• Inflatable restraint instrument panel (I/P) module
• Inflatable restraint steering wheel module
• Inflatable restraint steering wheel module coil
• Inflatable restraint seat belt retractor pretensioners
• Inflatable restraint wiring harnesses
• Steering wheel and column
• Driver and front passenger knee bolsters
A frontal collision of sufficient force will deploy the frontal
air bags and/or pretensioners. The sensing and
diagnostic module (SDM) contains a sensing device that
converts vehicle velocity changes to an electrical signal.
The SDM compares these signals to values stored in
memory. If the signals exceed a stored value, the SDM
will determine the severity of the impact and either cause
current to flow through the frontal deployment loops
deploying the frontal air bags and pretensioners, or it will
deploy the pretensioners only. The SDM, I/P module,
steering wheel module, steering wheel module coil, seat
belt retractor pretensioners, and the connecting wires
make up the frontal deployment loops. The SDM
continuously monitors the deployment loops for
malfunctions and turns the AIR BAG indicator ON if a
fault is detected.