Fiat 1996 Brava Service Manual page 457

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'98 range
16v
Engine
Fuel system
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N.C. N.A. C
10.
INERTIAL SAFETY S W I T C H
In order to increase the safety for the vehicle's
occupants in a crash, the car has an inertial
switch located in the interior compartment
under the driver's seat.
This sensor reduces the possibility of fire
(caused by fuel leaking from the fuel injec­
tion system) by disabling the fuel pump
which feeds the injection circuit.
The switch consists of a steel ball mounted in
a housing (conical seating) and held in posi­
tion by the force of attaction of a permanent
magnet.
In the event of a violent crash of the vehicle,
the ball is released from the magnetic stop
and it opens the normally closed (N.C.) elec­
trical circuit, interrupting the earth connec­
tion of the fuel pump and consequently the
feed to the fuel injection system.
To restore the fuel pump's earth connection,
push back the seat and press on the switch
until you hear it engage.
Removing-refitting
1. Push the driver's seat back fully, undo the
bolts indicated and remove the plastic
cover.
2. Undo the bolts indicated, disconnect the
wiring connection and remove the switch.
After a crash, even if apparently mi­
nor, if the smell of fuel is perceived or
there are leaks from the fuel system,
do not reset the switch until you have
found and eliminated the fault, in or­
der to avoid the risk of fire.
Components constituting the inertial
switch
1.
2.
3.
4.
5.
6.
7.
8.
Complete inertial switch
Sheath
Button
Top
Engagement side,
Permanent magnet
Permanent magnet seating
Steel ball
C= Shared terminal
N.C. Normally closed
N.A. Normally open
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