15
Diagnostics
The lap belt tensioner is a pyrotechnic component. The
safety instructions are the same as for other pyrotechnic
components. The lap belt tensioner is damaged when
ignited and has to be replaced as a unit.
Airbag Control Module J234 continuously monitors the lap
belt tensioners for proper functioning and will enter a DTC
if faults are detected.
Buckle
The dierence between this safety belt buckle and a
"regular" safety belt buckle is that it locks the belt in the
event of an accident which matches the criteria for deploy-
ment. The result is a load path for the thorax region and a
load path for the pelvic region, with all the aforementioned
benets for the occupants.
637_047
Belt deector
Foam pad
Steel cable of the
lap belt tensioner
637_048
Seat belt join
Coupling
The safety belt is deected in the area of the ‘B’ pillar and is
able to move upwards. A coupling is stitched to the end of
the safety belt. The lap belt tensioner coupling is inserted
into the safety belt coupling and clipped into place. To
insulate against noise, a foam pad is installed in the cou-
pling area.
Coupling
The lap belt tensioners are bolted into place on the ‘B’
pillars.
Installation location of the lap belt tensioner
637_046
Lug engaged
in the ‘B’ pillar
Lap belt tensioner
On left hand side
of the vehicle
Reference
For further information about the function of the lap belt tensioner and buckle, please see eSelf-Study Program
990143, The 2015 Audi A3 Introduction.
Lap belt tensioner
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