2017 AUDI A8 warning light

Safe ty belts
during hard braking and in an accident. The be lt
may a lso lock when you drive up or down a steep
h ill or through a sharp curve. Dur ing normal driv­
ing the belt lets you move freely .
Safety b elt pr ete nsione rs
The safety be lts are equ ipped with a belt preten ­
sioner that helps to tighten the safety belt and
remove slack when the pretensioner is activated
¢
page 224. The function of the pretensioner is
monitored by a warning light ¢
page 23.
Convertibl e loc king retra ctor
Every safety be lt except the one on the driver
seat is equipped with a convertible locking retrac­
tor that
must be used when the safety belt is
used to attach a child seat. Be sure to read the
important information about this feature
¢page 258.
A WARNING
Improperly pos it ioned safety belts can cause
ser ious injury in an accident¢
page 222,
Safety belt position.
- Safety belts offer optimum protection only
when the seatback is upright and belts are
prope rly positioned on the body.
- Never attach the safety belt to the buckle
for another seat. Attaching the belt to the
wrong b uck le wi ll red uce safety belt effec­
t iveness and can cause serious persona l in­
jury.
- A passenger who is not p roper ly restrained
can be serio usly injured by the safety be lt it­
self when it moves from the stronger parts
of the body into cr it ical areas like the abdo ­
men.
- Always lock the convertible lock ing retractor
when you are secur ing a child seat in the ve­
hicle ¢
page 260.
@ Tips
For information on safety belt pretensioners,
refer to
¢ page 224.
222
Safety belt position
Correct belt position is the key to getting maxi­
mum protection from safety belts.
Fig. 2 27 Safety belt posit ion
Use the height adjus tment to change the posit io n
of the shoulder belt of the front safety belts.
A WARNING
Improperly positioned sa fety belts can cause
serious personal injury in an accident.
- The shou lder belt should lie as close to the
center of the collar bone as possib le and
should fit well on the body. Hold the belt
above the latch tongue and pull it evenly
across the chest so that it s its as low as pos­
sible on the pe lvis and there is no p ressure
on the abdome n. T he belt sho uld a lways fit
snug ly¢
fig. 22 7. P u ll on the bel t to tigh ten
if necess ary.
- A loose-fit ting safety belt can ca use serious
in ju ries by s hifting its posi tion on yo ur body
from the strong bones to mo re v ulnera ble,
so ft tissue and cause serious in jury.
- Always read and heed all WARNINGS an d
o ther impor tan t in formation¢
page 220 .

Airbag syste m
seat. It can be a very dangerous place fo r an
infant or a child in a rearward -facing seat.
The Advanced Airbag System i n your veh icle has
been ce rt ified to comp ly with the requirements
of United States Federa l Motor Vehicle Safety
Standard ( FMVSS)
208, as well as Canada Motor
Veh icle Safety Standard (CMVSS)
208 as applica ­
b le at the time your vehicle was manufactured.
According to requirements, the front Advanced
Airbag System on the passenger s ide has been
certified for "suppression " for infants of about
12 month old and younger and for "low risk de­
p loyment " for children aged
3 to 6 years o ld (as
defined in the standard).
The
PA SSENGER AIR BAG OFF light in the instru­
ment panel tells you when the front Advanced
Ai rbag on the passenger side has been tu rned off
by the ele ct roni c con trol unit.
Each t ime you sw itch on the ign it ion, the
PAS­
SENGER AIR BAG OFF
li ght will come on fo r a
few seconds and:
- will stay on if the front passenger seat is not
occupied,
- will stay on if there is a small c hild or child re­
straint on the front passenger seat,
- will go off if the front passenger seat is occu­
pied by an adult as reg istered by the weight ­
sensing mat¢
page 236, Monitoring the Ad­
vanced Airbag System .
The PASSENGER AIR BAG OFF light comes on
when the control unit detects a tota l we ight on
the front passenger seat that requires the front
a ir bag to be turned off.
If the tota l weight on the front passenger seat is
more than that of a typical 1 year -old child but
less than the we ight of a small adult, the front
a ir bag on the passenger side can deploy (the
PASSENGER AIR BAG OFF ligh t does not come
on) .
If the PASSENGER AIR BAG OFF light does
not come on, the front a irbag on the passenger
side has not been turned
off by the electronic
control unit and can deploy if the control unit
senses an impact that meets the condit ions stor ­
ed in its memory.
For e xample, the airbag may deploy if:
228
- a small ch ild that is heav ier than a typica l 1
year-o ld child is on the front passenger seat
(regard less of whether the child is in one of the
child seats listed
¢ page 250), or
- a child who has outgrown c hild restraints is on
the front passenger seat.
If the front passenger a irbag is t urned
off, the
PASSENGER AIR BAG OFF light comes on in the
i nstrument cluster and stays on.
The fro nt airbag on the passenge r side m ay
not
deploy (the PASSENGER AIR BAG OFF light does
not ill uminate and stay lit) even if a small adu lt
or teenager, or a passenger who is not sitting up­
right with their back against a non-recl ined back­
rest with the ir fee t on the vehicle floor in front of
the sea t is on the front passenger seat
<=> page 208 , Proper seating position for the driv ­
er .
If the front passenger a irbag deploys, the Feder­
al Standard requires the airbag to meet the "low
risk" deployment cr iteria to reduce the r isk of in ­
j ury th rough interaction w ith the airbag . "low
risk" deployment occurs in th ose crashes that
take place at lowe r decele rations as defi ned in
the e lec tronic co ntro l unit ¢
page 23 7, PASSEN­
GER AIR BAG O FF light.
Always remembe r, a ch ild seat or i nfant ca rr ie r
i nsta lled on the fron t seat may be s truck a nd
k nocked o ut of pos it ion by the rapid ly inflat ing
passenger 's airbag in a frontal co llision . The air­
bag cou ld great ly reduce the effectiveness of the
c hi ld rest raint and even seriously injure the child
during in flat ion.
Fo r th is reason, and beca use the back seat is the
safest place for children - when proper ly restrain ­
ed according to their age and size -we strongly
recommend that children always sit in the back
seat
c> page 248, Child safety .
A WARNING
A child in a rearward-facing child seat instal­
led on the front passenger seat will be seri­
ously injured and can be killed if the front air­
bag inflates - even with an Advanced Airbag
Sys tem.

0 co .... N ,..... N .... 0 0 :c ' -The inflating airbag will hit the child seat or
infant carrier w ith great force and will
smash the ch ild seat and child against the
backrest, center armrest, door or roof .
- Always install rear-facing child seats on the
rear seat.
- If you must install a rearward fac ing ch ild
seat on the front passenger seat because of
exceptional c ircumstances and the
PA SSEN­
GER AIR BAG OFF
light does not come on
and stay on, immediately insta ll the rear­
facing child seat in a rea r seat ing position
and have the airbag system inspected by
yo ur Audi dealer.
- Forward-fac ing ch ild seats insta lled on the
front passenge r's seat may in terfere with
the deployment of the airbag and cause se­
rious persona l injury to the child.
,&. WARNING
I=
If, in exceptional circumstances, you must i;-
stall a forward-facing chi ld restraint on the
front passenger's seat:
- Always ma ke sure the forward -facing seat
has been designed and certified by its man­
ufact urer for use on a front seat with a pas­
senger front and side a irbag.
- Never put the forward-facing child restraint
up against or very near the instrument pan­
el.
-Always move the front passenger seat to
the highest position in the up and down ad­
justment range and move it back to the
rearmost position in the seat's fore and aft
adjus tment range, as fa r away from the air­
bag as possib le, before insta lling the for­
wa rd-facing child restra int.
- Always make sure tha t the safety belt upper
anchorage is beh ind the child restrain t and
not next to or in front of the chi ld res train t
so that the safety belt will be properly pos i­
tioned.
- Make sure tha t the
PASSENGER AIR BAG
OFF
light comes on and stays on all the time
whenever the ignition is switched on .
Airbag sys tem
,&. WARNING
To reduce the risk of serious injury, make sure
that the
PASSENGER AIR BAG OFF light will
be d isplayed whenever a child restraint is in­
stalled on the front passenger seat and the
i gnition is switched on .
-If the PASSENGER AIR BAG OFF light does
not stay on , perform t he checks described
~ page 236, Monitoring the Advanced Air­
bag System.
- Take the child restra int off t he front passen­
ge r seat an d install it prope rly at one of the
rear sea t positions i f the
PASSENGER AIR
BAG OFF
light does not stay on .
- Have the air bag system inspec ted by your
Aud i dealer immediately.
- Always c are fully follow ins tructions from
child restrain t manufacture rs when instal­
ling child restraints .
If, in exceptional c ircumstances, you must in ­
stall a forward or rearward-facing child re­
stra int on the front passenger's seat:
- Imp roper installation of child restraints can
reduce their effectiveness or even prevent
them f rom providing any protect ion.
- An improperly installed child restra int can
interfere with the airbag as it deploys and
serious ly injure or even kill the chi ld -even
with an Advanced A irbag System.
- Always care fully follow the manufacturer 's
instr uctions provided with the child seat or
car rier.
- Never p lace add itiona l items on the seat
that can increase the total weight registered by the weight -sensing mat and can cause in ­
jury in a crash.
229

Airbag syste m
-a small adu lt or teenager is on the front pas ­
senger seat
- a passenger who is not sitting upright with
their back against a non -reclined backrest with
their feet on the vehicle floor in front of the
seat is on the front passenger seat.
I f the front passenger airbag dep loys, the Feder ­
al Standard requires the airbag to meet the "low
risk" deployment criteria to help reduce the risk
of injury through interaction with the airbag.
"Low risk" deployment occurs in those crashes
that take place at lower decelerations as def ined
in the electronic control unit¢
page 236.
Alway s remember: Even though your vehicle is
equ ipped w ith Advanced Airbags, the safest place
for children is properly restrained on the back
seat . Please be sure to read the important infor­
mat ion in the sections that follow and be sure to
heed a ll of the WARN INGS.
A WARNING
To red uce the risk of inj ury when an ai rbag in­
fla tes, a lways wear safety bel ts p roperly.
- If you are unrestrained, leaning fo rwa rd, s it­
t ing s ideways or o ut of pos ition in any way,
yo ur risk of in jury is much h igher .
- Yo u will also re ceive serious injur ies and
could even be killed if you are up aga inst the
airbag or too close to it when it inflates -
even with an Advanced Airbag ¢
page 226.
A WARNING
A child in a rearward-facing chi ld seat insta l­
led on the front passenger seat will be seri­
ously injured and can be k illed if the front air­
bag inflates -even with an Advanced Airbag
System.
- Although the Advanced A irbag System in
your vehicle is designed to turn off the front
airbag when a rearward-facing child re­
straint has been installed on the front pas­
senger seat, nobody can absolutely g uaran­
tee that deployment is impossible in all con­
ceivable s ituations that may happen during
the usef ul life of your vehicle .
- The inflating a irbag w il l hit the child seat or
infant carrier w ith great force and will
232
-
smash the child seat and child against the
backrest, center armrest, door, or roof.
- Always install rearward-facing child re ­
straints on the rear seat.
- If you must install a rearward facing child
seat on the front passenge r seat because of
except ional circumstances and the
PASSEN­
GER AIR BAG OFF
light does not come on
and stay on, immed iate ly install the rear­
facing chi ld seat in a rear seating posit ion
and have the airbag system inspected by
your Aud i dea le r.
A WARNING
If, in exceptional ci rcums tances, you must in­
stall a forward-facing child restraint on the
fron t passenger's seat:
- Always make sure the forward-fa cing sea t
has been des igned and certified by its man­
ufacturer for use on a front seat with a pas ­
senger front and side airbag.
- Never put the forwa rd-facing child restrain t
up against or very near the instr ument pan ­
el.
-Always move the front passenge r seat to
the highest position in the up and down ad­
justment range and move it back to the
rearmost position in the seat's fore and aft
ad justment range, as far away from the air­
bag as poss ible, before installing the for­
ward-facing chi ld restraint.
- Always make sure that the safety be lt upper
anchorage is behind the ch ild restraint and
not next to or in fron t of the child restraint
so that the safety be lt will be p roperly posi­
tioned.
- Ma ke sure that the
PASSENGER AIR BAG
OFF
li ght comes on and stays on a ll the time
wheneve r the ign it ion is swi tched on.
· Advanced Airbag System components
The fro nt passenge r sea t in your veh icle has a lo t
of ve ry important parts o f the Advanced A irbag
System in it. These parts include t he weight­
sensing mat, sensors, wiring, brackets, and
more. The fu nction of the system in the front
passenger seat is checked by the electronic
1111>

control unit when the ignition is on. The control
unit monitors the Advanced Airbag System and
turns the airbag indicator light on when a ma l­
function in the system components is detected. The funct ion of the a irbag indicator light is de­
scr ibed in greater deta il below . Because the front
passenger seat contains important parts of the
Advanced Airbag System, you must take care to p revent it from being damaged. Damage to the
seat may preven t the Advanced A irbag for the
fron t passenger seat from doing its job in a
crash .
The front Advanced Airbag System consists
of the follo wing :
-Crash sensors in the front of the vehicle that
measure vehicle acceleration/deceleration to
provide information to the Advanced Airbag
System a bout the severity of the crash.
- An e lectronic control unit, with integrated
crash sensors for front and side impacts. The
control unit "decides" whether to fire the front
airbags based on the information received from
the crash sensors. The control unit also "de­
c ides" whether the safety belt pretens ioners
should be activated .
- An Advanced Airbag with gas generator and
control valve for the driver ins ide the steer ing
wheel hub .
- An Advanced Airbag with gas generator and control valve inside the instrument pa nel for
the front passenger.
- A weig ht-sensing mat under the upholstery
padd ing of the front passenger seat cushion
that meas ures the total weight on the seat. The
i nformation registered is sent continuously to
the e lectron ic cont rol unit to reg ulate dep loy­
ment of the front Adv a need Airbag on the pas­
senger side .
- An airbag monitoring system and indicator
light in the instrument cluster
¢ page 236.
-A sensor in eac h front seat registers the dis­
tance between the respective seat and the steering wheel or instrument pane l. The infor­
mation registered is sent contin uously to the
0 co electronic control unit to regulate deployment ....
~ of the front Adva need A irbags. N .... 0 0 :c ' Airb ag sys tem
- The PASSENGER AIR BAG OFF light comes on
and stays on in the center of the instrument
pane l¢
page 237, fig . 233 and te lls yo u when
the front Advanced Airbag on the passenger side has been turned off.
- A sensor below the safety be lt latch for the
front seat passenger to measure the tension on the safety belt. The tension on the safety belt
and the we ight registered by the weight -sens­
ing mat help the contro l unit "decide" whether
the front airbag fo r the front passenger seat
should be tu rned off o r not ¢
page 22 7, Child
restraints on the front seat -some important
things to know.
- A sensor in the safety belt latch for the driver
and for the front seat passenger that senses
whether that safety be lt is latched o r not and
transmits this information to the electronic control unit.
A WARNING ,-
Damage to the front passenger seat can pre-
vent the front airbag from working properly.
- Improper repair or disassembly of the front passenger and driver seat will prevent the
Advanced Airbag System from funct ion ing
properly .
- Repairs to the front passenger seat must be
performed by qualified and properly trained
workshop personnel.
- Never remove the front passenger or driver
seat from the vehicle.
- Never remove the upholstery from the front
passenger seat.
- Never d isassemble or remove parts from the
seat or disconnect w ires from it.
- Never carry sharp objects in your pockets or
p lace them on the seat. If the weight-sens­
ing mat in the passenger seat is punctured
it cannot work properly .
- Never carry things on your lap or carry ob­
jects on the passenger seat . Such items can
increase the weight reg istered by the
weight-sensing mat and send the wrong in­
formation to the a irbag con trol u nit.
- Never store items under the front passenger
seat. Parts of the Advanced Airbag System
under the passenger seat cou ld be
~
233

Airbag syste m
damaged, preventing them and the airbag
system from working properly.
- Never place seat covers or rep lacement up­
holstery that have not been specifically ap­
proved by Audi on the front seats .
- Seat covers can prevent the Advanced Air­
bag System from recognizing child re­
straints or occupants on the front passenger
seat and prevent the side a irbag in the seat
backrest from deploying properly.
- Never use cush ions, pillows, blankets or
similar items on the front passenger seat.
The add it ional padding will prevent the
weight-sens ing mat in the seat from acc u­
rately reg istering the ch ild restraint or per­
son on the seat and prevent the Advanced
Airbag System from funct ioning properly.
- If you must use a child rest raint on the front
passenge r seat and the child restraint man­
ufacturer 's instructions require the use of a
towel, foam cushion or something else to properly position the ch ild restraint, make
certain that the
PA SSENGER AIR BAG OFF
light comes on and stays on whenever the
child restraint is installed on the front pas­
senger seat.
- If the
PASSEN GER AIR B AG OFF light does
not come on and stay on, immed iately in­
stall child restraint in a rear seating position and have the airbag system inspected by
yo ur Audi dealer.
How the Advanced Airbag System
components work together
The front Advanced Airbag System and the side
airbags supplement the protection offered by the
front three-po int safety belts with pretensioners
and load limiters and the adjustable head re­
stra ints to help reduce the r isk of injury in a wide
range of accident and crash situations. Be sure to read the important informa tion about safety and
heed the WARN INGS in t his chapter.
Deployment of the Advanced Airbag System and
the act ivat ion of the safety belt pretensioners de­
pend on the deceleration measu red by the crash
sensors and regis tered by the electronic control
unit. Crash severity depends on speed and decel-
2 34
eration as well as the mass and stiffness of the
vehicle or object involved in the crash .
On the passenger side, regard less of safety be lt
u se, the airbag will be turned off if the weight on
the passenger seat is less than the amount pro­
grammed in the electronic control unit . The front
airbag on the passenger side will also be turned
off if one of the child seats that has been certi­
fied under Federal Motor Vehicle Safety Standard 208 has been recognized on the seat. The
PA S­
S ENGER AIR BAG OFF
light comes on and stays
on to tell you when the front Advanced A irbag on
the passenger side has been turned off
q page 22 7, Child restraints on the front seat­
some important things to know.
A WARNING
To reduce the ris k of injury when an airbag in ­
f lates, always wea r safety belts properly.
- If you are un restrained, leaning forward, sit ­
ting sideways or out of position i n any way,
your risk of injury is much higher.
- You will a lso receive serious injuries and
could even be killed if you are up against the
airbag or too close to it when it inflates -
even with an Advanced Airbag
q page 226.
More important things to know about front
airbags
Fig . 232 Inflated front a irbags
Safety be lts are important to help keep front
seat occupants in the proper seated position so
that airbags can unfold properly and prov ide sup-
plemental protection in a fronta l collision . ..,.

0 co .... N ,..... N .... 0 0 :c ' The front airbags are designed to provide addi­
tional protection for the chest and face of the
driver and the front seat passenger when:
- sa fety belts are worn prope rly,
- the seats have been positioned so that the oc-
c u pant is properly sea ted as far as possible
from the airbag,
- and the head restra ints have been p roperly ad-
justed.
Because airbags inflate in the blink of an eye w ith
g reat fo rce, things you have on your lap or have
p laced on the seat cou ld become dangerous pro­
jectiles , and be p ushed into you if the ai rbag in ­
flates.
When an a irbag deploys, fine dust is released.
This is normal and is not caused by a fire in the
ve hicl e. Thi s dust is made up mostly of a powder
used to lubricate the airbags as they deploy. It
could irritate skin.
It is important to remember that whi le the sup­
p lemental airbag system is designed to reduce
the likel ihood of ser ious injuries, other i nju ries,
for example swelling, bru is ing and minor abra­
sions, can a lso happen when airbags inflate . Air­
bags do not protect the arms or the lower parts
of the body. Front airbags supplement the three­
point safety belts only in some frontal collisions
i n which the ve hicle decelerat io n is high enough
to deploy the airbags .
Front airbag s will not deploy:
- if the ignit ion is switched off when a crash oc-
curs,
- in side collisions,
- in rear-end collisions,
- in rollove rs,
- when the c rash decelerat io n meas ured by the
airbag system is less than the minimum thresh­
o ld needed for airbag deployment as registered
by the electronic contro l unit.
The front passenger airbag also will not
d eplo y:
- when the front passenger seat is not occ upied,
- when the we igh t on the fron t passenge r seat as
sensed by t he Advanced A irbag System indi-
Airb ag sys tem
cates that the front a irbag on the passenger
side has to be turned off by the e lectronic con­
trol unit (the
PASSENGER AIR BAG OFF light
comes on and stays on).
A WARNING
Sitting in the wrong position can increase the r isk of ser ious injury in crashes .
- To reduce the r isk of injury when the airbags
inflate, the driver and passengers must al­
ways sit in an upright posit ion, must not
lean aga inst or place any part of their body
too close to the area where the airbags are
lo cated.
- Occupants who are unbelted, out of posit ion
or too close to the airbag can be serio usly
in jur ed by an airbag as it unfolds with g reat
force in the blink of an eye
~ page 22 7.
A WARNING
-A child in a rearward-facing child seat instal­
l ed on the front passenger seat will be seri ­
ously injured and can be killed if the front air­
bag inflates -even with an Advanced Airbag
System.
- The inflating airbag will h it the ch ild seat o r
infant carrier with great force and will
smash the child seat and child against the backrest, center armrest, door or roof.
- Always install rear-fac ing child seats on the
rear seat.
- If you must install a rea rward facing child
seat on the front passenger seat because of
except ional circumstances and the
PASSEN­
GER AIR BAG OFF
light does not come on
and stay on, immed iate ly install the rear­
facing chi ld seat in a rear seating posit io n
a nd have the airbag system inspected by
your Aud i dea le r.
A WARNING
Objects between you an d the airbag will in­
crease the risk of injury in a crash by interfer ­
ing with the way the airbag unfolds or by be­
i ng p ushed into you as the airbag inflates .
- Never hold things in yo ur hands or on your
lap when the vehicle is in use .
235

Airbag syste m
-Ne ver t ransport items on or in the area of
t h e fr ont passenger seat. Objects could
m ove into the area of the front airbags dur­
ing brak ing or oth er sudden maneuvers and
become dangerous projectiles that can
cause serious pe rsonal injury if the a irbags
inflate.
- Never place or attach accessor ies or other
objects (such as cup holders, te lephone
brackets, large, heavy o r bulky objects) on
the doors, over or ne ar the area marked
"AIRBAG" on the steering wheel, instru ­
ment pane l, seat bac krests or between
t h ose areas and yourself. These objects
could cause injury in a crash, especially
when the airbags inflate.
- Never recline the front passenge r's seat to
transport objects. Items can also move into
the area of the side airbag o r the front a ir­
bag dur ing braking or in a s udden maneu­
ver. Objects near the airbags can become
projectiles and cause in ju ry, particularly
when the sea t is re clin ed.
.8, WARNING
The f ine dust create d when airbags deploy can
cause breathing problems for people w ith a
his tory of asthma or o ther breathing condi­
tions .
- T o reduce the risk o f brea thing pro blems,
those w ith asthma or o ther respiratory con ­
ditions should get fresh air right away by
gett ing out of the vehicle o r opening w in­
dows o r doors.
- If you are in a collision in which airbags de­
ploy, wash your hands and face with mild
soap and water before eat ing.
- Be careful not to get the dust into your eyes,
or into any cuts or scratches.
- If the resid ue should get into your eyes,
flush them with water.
236
Monitoring the
Advanced Airbag System
tli (USA models )/!{' (Canada model s)
Airbag monitoring indicator light
Two separate indicators monitor the function of
the Advanced Airbag System: the airbag moni­
toring indicator light and the
PASSENGER AIR
BAG OFF
light.
The Advanced A irbag System ( including the e lec ­
tronic control unit, sensor circuits and system
wiring) is monitored continuously to make sure
that it is functioning properly whenever the igni­
tion is o n. Each time you sw itch on the ig nition,
the a irbag mo nitor ing indica to r light
II (U SA
models)/ fll (Canada models) w ill come o n for a
few seconds (se lf d iagnost ic s) .
The system must be inspected when the
indicator light
fl (USA models) /E,I (Canada
models) :
-does not come on when the igni tion is sw itched
on,
- does not go out a few se co nd s afte r you h ave
sw itched on the ignit ion, or
- comes on while driv ing.
If an airbag system malfunction is detected, the
i ndica to r light will come on to se rve as a constant
r em inder to have t he system inspected immedi­
ate ly.
If a ma lfunction occurs that turns the front air­
bag on the passenge r side off, the
PASSENGER
A IR BAG OFF
light w ill come on and stay o n
whe never the ignition is on.
_& WARNING
A n a ir b ag system t hat i s no t functioning prop­
e rly cannot provide sup plemental pro te ct ion
in a fronta l crash .
- If the air bag ind icator ligh t<=? page 23
comes when the vehicle i s being u sed, have
the system inspected immediately by your
author ized Audi dealer . It is possib le that
the airbag will inflate when it is not sup­ posed to, or will not inflate when it should.