SUPPLEMENTAL RESTRAINT SYSTEM
9J–7
Knee Bolster
The knee bolsters are used to absorb energy to protec
knees and control the forward movement of the vehicle's
front seat occupants during a frontal crash, by limiting
leg movement.
740RS021
Definition
Air Bag
An inflatable cloth cushion designed to deploy in certain
frontal crashes. It supplements the protection offered by
the seat belts by distributing the impact load more
evenly over the vehicle occupant's head and torso.
(B+)
Battery voltage, (B+) The voltage available at the
battery at the time of the indicated measurement. With
the key “ON" and the engine not running, the system
voltage will likely be between 12 and 12.5 volts. At idle
the voltage may be 14 to 16 volts. The voltage could be
as low as 10 volts during engine cranking.
Bulb Check
The Sensing and Diagnostic Module (SDM) will cause
the “AIR BAG" warning lamp to flash seven times and
then go “OFF" whenever the ignition switch transitions
to the ON position from any other ignition switch position
and no malfunctions are detected.
“CONTINUOUS MONITORING"
Tests performed by the SDM on the SRS every 100
milliseconds while “Ignition 1" voltage is in the normal
operating voltage range at the SDM.
Data Link Connector (DLC)
Formerly “DLC" a connector which allows
communication with an external computer, such as a
scan tool.
Deploy
To inflate the air bag.
Deployment Loops
The circuits which supply current to the air bag
assemblies to deploy the air bag.
Diagnostic Trouble Code (DTC)
Formerly “Code", a numerical designator used by the
SDM to indicate specific SRS malfunctions.
Driver Current Source
An output of the SDM which applies current into the
driver air bag assembly circuit during the “Initiator
Assembly Resistance Test".
Driver Air Bag Assembly
An assembly located in the steering wheel hub
consisting of an inflatable bag, an inflator and an
initiator.
EEPROM
Electronically Erasable Programmable Read Only
Memory. Memory which retains its contents when
power is removed from the SDM.
Ignition Cycle
The voltage at the SDM “Ignition 1" inputs, with ignition
switch “ON", is within the normal operating voltage
range for at least ten seconds before turning ignition
switch “OFF".
Ignition 1
A battery voltage (B+) circuit which is only powered with
the ignition switch in the ON, or START positions.
Initiator
The electrical component inside the air bag assembly
which, when sufficient current flows, sets off the
chemical reaction that inflates the air bag.
“Initiator Assembly Resistance Test"
Tests performed once each ignition cycle when no
malfunctions are detected during “Turn–ON" or
“Continuous Monitoring." This test checks for the
correct SDM configuration for the vehicle, shorts to
“Ignition 1" in the deployment loops, high resistance or
opens in the “Driver Side High", “Driver Side Low",
“Passenger Side High" and “Passenger Side Low"
circuits and measures the resistance of the inflator
assembly consisting of: 1) Initiators, 2) SRS coil
assembly (driver side only), 3) Connectors and
associated wiring.
Normal Operating Voltage Range
The voltage measured between the SDM “Ignition 1"
terminals and “Ground" terminals is between 9 and 16
volts.
Passenger Current Source
An output of the SDM which applies current into the
passenger air bag assembly circuit during the “Initiator
Assembly Resistance Test".
Passenger Air Bag Assembly
An assembly located in the left side of the instrument
panel consisting of an inflatable bag, an inflator and an
initiator.