Fasten Safety Belt Indicator
The IPC illuminates the fasten safety belt indicator when the following occurs:
| • | The body control module (BCM) detects that the driver's seat belt is
unbuckled. The BCM sends a message to the IPC via the serial peripheral interface
(SPI) requesting illumination. The IPC illuminates the indicator for 20 seconds
and then flashes the indicator for 55 seconds. The BCM also sends a class 2
message to the radio in order to activate an audible warning. |
| • | The IPC performs the displays test at the start of each ignition cycle
as commanded by the BCM. The indicator illuminates for approximately 3 seconds. |
| • | The IPC detects a loss of SPI communications with the BCM. |
Restraint System
Seat belts are the primary means of occupant restraint.
Seat belts help to keep occupants inside the passenger compartment and gradually
reduce the impact forces during the following events:
| • | Frontal impact type crashes |
| • | Rear impact type crashes |
| • | Side impact type crashes |
All seat belt retractors have emergency locks. The retractors remain unlocked
during normal operation and under normal driving conditions. The retractors remain
unlocked during normal conditions in order to allow free movement of the upper body
of each occupant.
A pendulum locks the seat belt webbing into position. The pendulum causes
a locking bar to engage a cog on the spool of the retractor mechanism when the following
conditions occur:
| • | A rapid extraction of the seat belt webbing from the retractor |
| • | An abrupt change in the vehicle speed |
| • | An abrupt change in the vehicle direction |
| • | Operation of the vehicle on a steep upgrade |
| • | Operation of the vehicle on a steep downgrade |
The front passenger seat belt has an automatic locking feature, or cinch feature.
The cinch feature is recommended for securing a child seat. The cinch feature is engaged
by fully extending the seat belt from the retractor. Once engaged, the seat belt can
retract, but cannot be extended again until the cinch feature is cancelled. The cinch
feature is cancelled when the seat belt has fully retracted.
This vehicle is also equipped with a supplemental inflatable restraint
(SIR) system. Refer to
SIR System Description and Operation
in SIR.
Front Seat System
The front seat belt system includes the following components:
| • | The driver and the passenger seat belt buckles, attached to the inboard
side of the seat frame |
| • | The driver and the passenger seat belt retractors, attached to the lock
pillar or center pillar |
The driver seat belt system includes a seat belt switch in the driver seat
belt buckle. The seat belt switch controls the fasten safety belt indicator and a
tone alarm. The fasten safety belt indicator and the tone alarm will not operate
when the following conditions exist:
| • | The driver seat belt is buckled. |
| • | The driver door is closed. |
| • | The ignition switch is turned ON. |
The following events will occur when the driver door is closed and the ignition
switch is turned ON, but the driver seat belt is not buckled:
| • | The tone alarm will operate for 4-8 seconds and then turn
off. |
| • | The fasten safety belt indicator will operate until the driver seat belt
is buckled, or until approximately one minute has elapsed. |
Refer to
Seat Belt Indicator Circuit Malfunction
, in order to diagnose faults in the fasten safety belt indicator,
or Wiring Systems in Body and Accessories, in order to diagnose faults in the tone
alarm.
Rear Seat System
The rear seat belt system includes the following components:
| • | The rear seat belt buckles, attached to the floor panel inboard of the
rear seats |
| • | The rear seat belt retractors, attached to the rear package shelf |
