Audi Q7 361 - Seat Occupancy Recognition System

Se at occu pied r e co gn itio n con t r o l un it J706
T h e sea t occupie d r e cog n ition contr o l un it J706 evaluates the s i gnals fr om the pr e ssur e sensor f o r se at
occupi e d r e co gniti o n G 452 and seat belt f o r c e senso r s f o r seat o c cu pied r e cognition G453 . T h e si gnal f r o m
the seat belt f o rce sensor f o r seat occup i ed detect ion pr ovides inf orma t ion on how high the tens ion f o rce is on
the seat belt. Ba sed on the signal fr om th e pr essu r e sensor f o r sea t occupied r e cognition, the s e at occupie d
r e cog n ition contr o l u n it determines the lo ad o n the f r o n t passenger seat. I f the load is below
app r o x . 20 k g a nd a very lo w o r n o belt f o r c e at a ll is de tected, the pr esenc e of a c h ild sea t is iden tif i e d by th e
sea
t occupied r e cog n ition contr o l u n it an d c o mmu ni c a ted t o the ai r b ag co ntr o l u n i t . T h e fr on t pa sse nger airbag
is deactivated by the airb ag contr o l u n it. If the lo ad on the seat is e.g. 25 kg an d the belt f o rce e x c eeds
a
specified value, the sea t occupied r e c o gn ition con t r o l u n it r e cog n ises tha t a dditiona l pr essu r e is b e i ng app l ied
by the c h ild seat ont o the s e at cushion via the se at belt. T h e contr o l unit r e cog n ises a the pr esence of
a
c h ild se at an d the a i rb ag c o ntr o l un it de a c tiva tes the f r ont passenger air bag. Abov e a l o ad of a ppr o x . 25 kg
a nd a low belt f orc e, the seat occ u pied r e cognition contr o l unit a ssumes th at the seat is occupied by an adult
and the fr ont p a ssenger airbag r e mains activated.
When the ignition is sw itc h ed on, the sensor inf o rmatio n is eva l ua ted continuo usl y . T h is ensur e s that th e sea t
occupie d r e c o gn ition c o ntr o l unit detects a nd r e acts t o an y c h an ges in seat occupancy . I n order t o p r event th e
lo ad c h a n ges occur r ing duri ng dr iving op er a t ion fr om r e su lting in i mmediate de activation of th e fr ont
pa sse nger a i rba g , the system oper a t es with a c e r t ain dela y duri ng driving . A n a ccel e r a tio n sensor instal led i n
the seat occupied r e c o gn ition con t r o l unit com munic ates vehicle movements t o the electr onics.
Seat l o a d Be l t f o r c e R e c o gnitio n
Le ss t h a n ap pr ox. 20 kg V ery lo w o r no ne Ch ild se a t
E. g. 25 k g Ve r y h i g h Ch ild se a t
Mo r e t h an ap pr ox. 25 kg Lo w Ad u l t
D a ta e x c h ange between the airb ag co ntr o l u n it J234 an d the seat o c cu pied r e cognitio n contr o l unit J706 is
per f ormed via the LIN bus. Diag nostic monit o ring is per f ormed by the a i rbag c o ntr o l unit.
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