Construction And Operation - Mitsubishi 1993 3000GT Technical Information Manual

CONSTRUCTION AND OPERATION

IMPACT SENSORS
There are 2 different types of sensors used; 2 front
impact sensors and safing impact sensor. One front
impact sensor is provided in each of the right and left
lower side members, and one safing impact sensor is
built in the SRS diagnosis unit. The right and left front
impact sensors are connected in parallel.
The front impact sensors are connected in series with
the safing impact sensor. If a front-end collision causes
either of the front impact sensors and the safing impact
sensor to be simultaneously "ON", the air bag will
deploy.
The front and safing impact sensors are essentially
identical in construction.
They are constructed as shown below and contain a G
sensor each.
The G sensor consists of a moving contact which is a
roll spring wound around a roller, a fixed contact
positioned in its moving direction, consisting of a base,
From
power supply
INTERIOR -
Supplemental Restraint System (SRS)
Safing impact
sensor
(Incorporated
in SRS diagnosis
unit)
a metallic case, etc. If an impact greater than preset is
applied in the direction of the arrow shown in the
illustration, the inertial force causes the roller to rotate
and move, so that contacts are brought into the ON
state. To maintain a high measure of G sensor
reliability, the contacts have been gold plated and the
metallic case charged with an inactive gas.
Each impact sensor contains a resistor connected in
parallel with the contacts for detection of a fault in the
wiring. The SRS diagnosis unit always supplies a very
small amount of current to the sensor circuit to monitor
a change in the circuit resistance.
Caution
Make sure that the impact sensors are never
disassembled.
Front impact
sensor (L..H.)
Air bag
module
(Squib)
Front impact
sensor (R.H.)
6-17
13R0724