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Air bags and seat belt pretensioners
88
Special features after triggering
These types of unit (30 or 50 track) can accept up
to four triggerings maximum. Therefore it is not
necessary to replace them each time the air bags
or pretensioners are triggered .
In the event of being triggered, the warning light
on the instrument panel is illuminated, but the
computer does not lock the ignition lines which
have not been triggered. These remain in opera-
tion.
On the other hand, the computer locks the memo-
rised faults in order to prevent accidental erasing
of the context register for the impact which cau-
sed triggering.
These contexts can later be used to simplify the
repair of the vehicles involved in accidents and al-
so for examination needs.
IMPORTANT, during repair following an impact,
an unlocking command must be carried out follo-
wed by a locking command for the computer to
lock all of the ignition lines.
Erasing memorised faults is only possible follo-
wing a computer unlocking command.
If the fault finding tool does not recommend re-
placing the computer, only replace the triggered
components and check that there are no faults.
When everything is correct, unlock the computer
using a fault finding tool; the system is again ope-
rational.
If the fault finding tool recommends replacing the
computer, it will indicate either :
• that the computer has triggered four times ei-
ther just the pretensioners or the pretensio-
ners and air bags or the side air bag which is
not self contained (according to equipment),
• or an internal fault in the computer .
In these two circumstances, replace the computer.Special notes for replacing the computer
A new computer must be fitted to the vehicle be-
fore reconnecting its connector (tightening tor-
que : 0.8 daN.m).
The arrow on the computer must point towards
the front of the vehicle.
After connecting the connector, carry out a check
using the fault finding tool and proceed with
configuration if the vehicle does not have a pas-
senger air bag.
When everything is correct, unlock the computer
using a fault finding tool; the system is again ope-
rational.
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