6-16 INTERIOR - Supplemental Restraint System (SRS)
CONSTRUCTION AND OPERATION
IMPACT SENSORS
There are 2 different types of sensors used; 2 front L.&J
impact sensors and safing impact sensor. One front built in the SRS diagnosis unit. The right and left
impact sensor is provided in each of the right and front impact sensors are connected in parallel.
The front impact sensors are connected in series
left shieldpla?e, and one safing impact sensor is
with the safing impact sensor.
Safing impact Air bag Front impact
sensor (Incorporated module sensor (L.H.)
in SRS diagnostic unit)
From
power supply -----)
Front impact
sensor (R.H.)
19x0593
If a front-end collision causes either of the front to rotate and move, so that contacts are brought
impact sensors and the safing impact sensor to
into the ON stage. To maintain a high measure
be simultaneously “ON”, the air bag will deploy.
of G sensor reliability, the contacts have been gold
They are constructed as shown below and contain
plated and the metallic case charged with an inactive
a G sensor each. gas. d
The front and safing impact sensors are essentially
identical in construction. Each impact sensor contains a resistor connected
The G sensor consists of a moving contact which in parallel with the contacts for detection of a fault
in the wiring. The SRS diagnosis unit always sup-
is a roll spring wound around a roller, a fixed contact
plies a very small amount of current to the sensor
positioned in its moving direction, consisting of a
circuit to monitor a change in the circuit resistance.
base, a metallic case, etc. If an impact greater than
Caution
preset is applied in the direction of the arrow shown
Make sure that the impact sensors are never
in the illustration, the inertial force causes the roller
disassembled.
Front impact sensor Safing impact sensor
Roller Roller
\ Moving contact
Fixed
19X0824
Fixed contact 19X0825