Audi Q7 361 - Belt Switches

P a ssenger pr otection
Belt switc h
Driv er side belt swi t c h E24
Fr ont passenger side belt swit c h E25
(I n th e driver and f r ont passenger side belt buc kles)
I n f o rmation a s t o whether or not the driver and fr ont
pa sse nger have f a stened their seat belts is r e q u ir ed
by the " s eat belt warning system" function. In order
f o r the a i rba g contr o l uni t t o r e ceive this inf o rm a t ion,
the b e lt switch es E24 a nd E25 ar e integr ated in th e
belt buc k les f o r the fr o n t seats.
T h e switch es f i tted ar e r eed switch es. T h e r ee d
switch es switch fr om "switch open" t o "switch
closed" thr o ugh the action of an e x te rn al m a gn e t ic
f i eld. T h e ma gnet 1 in the so- c a l led sprin g thorn is
loc a ted near the r eed switch wh en the latch plate is
not in ser t ed, i.e. the r eed switch is close d .
When the la tc h plate is inse r t e d in the belt buc k le,
the spring thorn is mo v e d.
T h e mag net 1 in the spring thorn no l onger acts
upon the r eed switch , i.e. the r eed swit c h is open .
Ba se d on th e mea s ur ed r e sistance value, the airb ag
contr o l unit r e cog n ises wh ether the se at b e lt is
fas t e n e d o r n o t .
361 _ 019
S p ring thorn
Spri ng thorn
Reed s w itc h
Sprin g thorn
Reed sw itc h
3 61_020 3 61_021
36 1_034
Magnet I
361_041
36
1_040
18