2009 AUDI A4 CABRIOLET battery replacement

Opening and clos ing
Master key with remote control
The rem ote control allows you to lock or unlock the
vehicle electronically.
F ig . 37 Fo ld- up ma ster
key with re mote
co ntr ol
- To fold the key out and back i n place, press the release
button ::::, fig. 37.
The transmitter and battery are located in the head of the remote
control. The receiver is located inside the vehicle. The maximum
effective range depends on several things. Remember, if the ba ttery
is weak, the effective range decreases.
I f you need to replace the remote cont ro l, or if you need to have it
repaired, you must see your authorized Audi dealer. Only then can
you use the key again .
[ i ] Tips
• If the ignition is switched on, the remote control system is deac ­
tivated.
• The remote control system can be affected by other systems
operating in the same frequency range close to the vehicle, such as
mobile telephones, television broadcasting stations, etc.
• For Declaration of Compliance to United States FCC and Industry
Canada regulations =>
page 320. •
Check light in remote master key
The check light in the rem ote master key indic ates the
state of charge of the battery.
S ta te o f m aste r k ey ba tt e ry
F ig . 3 8 Check lig ht in
th e m as ter key
When a button is pressed, the check light flashes=> fig . 38 (arrow).
If the check light does not come on or flash, the battery is dead and
has to be replaced .
Battery replacement =>
page 49. •

Master key battery replacement
Each master key contains a battery housed under the
cover.
Fig. 39 Master key:
opening the cover
We recommend having the battery changed by an autho­
rized dealership. However, if you wish to replace the dead
battery yourself, proceed as follows:
- Pry apart the base=> fig. 39
@ and the cover @carefully
with a coin.
- Remove the cover (arrow).
- Remove the dead battery from the cover.
- Install the new battery. Please make certain that the"+"
sign on the battery faces down. Correct polarity is shown
on the cover.
- Place the cover with the new battery on the key base and
press both parts together.
W For the sake of the environment
Dispose of dead batteries properly so as not to pollute the environ ­
ment.
Contro ls and eq uip­
ment
Opening and closing
[ i] Tips
The replacement battery must be the same specification as the
original. •
Electronic immobilizer
The immobilizer helps to prevent unauthorized use of
your vehicle.
A computer chip inside your key automatically deactivates the elec­
tronic immobilizer when you insert the key in the ignition lock.
When you remove the key from the ignition lock, the electronic
immobilizer is automatically activated once again.
If an unauthorized key was used,
SAFE is displayed continuously in
the odometer display field.
in. WARNING
Always take the key with you when you leave the vehicle. The key
can disarm the electronic engine immobilizer and permit an unau­
thorized person to start the engine and enable operation of the
vehicle systems such as power window or power top leading to
serious personal injury.
[ i] Tips
• Your engine can only be started using the factory -equipped key.
• You may not be able to start your vehicle if an ignition key of a
different vehicle make is also located on your set of keys.
• For Declaration of Compliance to United States FCC and Industry
Canada regulations
~ page 320. •
~ehicle care irechnical data

• .___S_ e_a _ t_ s_ a_ n_ d_ s_t _o _r_ a...; g==- e ________________________________________________ _
The socket of the cigarette lighter may be used for 12 -volt appli ­
ances with maximum consumption of up to 100 wat ts, such as a
flash light, small vacuum cleaner, etc.
Before you purchase any accessories, always read and fo llow the
informat ion in~ page
318, "Additional accessories and parts
replacement".
& WARNING
Improper use of the cigare tte l ighter can cause seriou s injury or
s ta rt a fire .
• Be c are ful when u sing the cigarette lighter. If you do n ot pay
attention t o what you a re do ing wh en you are u sing the cig are tte
lighter you can burn yourself .
• The cig arette lighte r and so ck et r em ain fu nctio nal e ven if the
ign ition i s switched off or the ig nition k ey is re m oved . Never l eave
c hildren in side the veh icle w ithout supe rvisi on.
0 Note
• To avoid damaging the socket, only use p lugs that fit properly .
• Only use the cigarette lighter socket as a power source for elec­
trical accessories for short durations. Use the socke ts in the vehicle
when a power source is needed for longer durations .
[ i ] Tips
When the engine is off and accessories are sti ll plugged in and are
on, the vehic le battery can sti ll be drained. •
Outlets
The outlet in the front center console and in the luggage
compartment may be used for 12-volt appliances .
IJ
-
Outlet in the front cent er co nsole
Fig. 12 3 Center
co nsole, fron t: 12-volt
outl et
F ig . 12 4 Sid e trim i n
lu gga ge co mpartmen t:
1 2- vol t outl et
Fo ld the cover fo r the outlet down => fig . 123.
Plug in appliance to be used .
Outlet in the luggage compartment
Tap cover => fig. 124.
Plug in appliance to be used .

________________________________________________ S_e_ a_ ts_ a_ n_d _ s_t _o _r_ a ....; g::. e _ ___,_
The outlet may be used for 12-volt appliances with maximum
consumption of up to 100 watts, such as a flash light, small vacuum
cleaner, etc.
Before you purchase any accessories, a lways read and follow the
information in~
page 318, "Additional accessories and parts
replacement".
& WARNING
The outlet plus any appliances plugged into it remain functional
even if the ignition is switched off or the ignition key is removed.
Never leave children inside the vehicle without supervision.
0 Note
To avoid damaging the socket, only use plugs that fit properly.
[ i] Tips
When the engine is off and accessories are still plugged in and are
on, the vehic le battery can still be drained. •
Storage
General
& WARNING
• Always remove objects from the instrument panel. Any items
not put away could slide around inside the vehicle while driving or
when accelerating or when applying the brakes or when driving
around a corner.
• When you are driving make sure that anything you may have
placed in the center console or other storage locations cannot fall
Contro ls and eq uip­
ment
& WARNING (continued)
out into the footwells . In case of sudden braking you would not be
able to brake, depress the clutch or accelerate .
• Any pieces of clothing that you have hung up must not interfere
with the driver's view. The coat hooks are designed only for light­
weight clothing . Never hang any clothing with hard , pointed or
heavy objects in the pockets on the coat hooks . During sudden
braking or in an accident -especially if the airbag is deployed -
these objects could injure any passengers inside the vehicle. •
Glove compartment
The glove compartment is illuminated and can be locked.
To open glove compartment
Fig. 125 Glove
compartment
P ull the handle~ fig. 125 in the direction of the arrow
and pull the lid down.
To close glove compartment
Push the glove compartment lid upward until the lock
engages.
In the glove compartment lid, you w ill find a place to store a pen and
a pad of paper . ..,_
~ehicle care irechnical data

__________________________________________________ A_ i_ r _b _a...; g::- s_ y=--- s_t _e _m ___ lffllll
& WARNING (continued )
• Always make sure that the side airbag can inflate without inter­
ference :
- Never install seat covers or replacement upholstery over the
front seatbacks that have not been specifically approved by
Audi.
- Never use additional seat cushions that cover the areas
where the side airbags inflate.
- Damage to the original seat covers or to the seam in the area
of the side airbag module must always be repaired immedi ­
ately by an authorized Audi dealer.
• The airbag system can be activated only once. After an airbag
has inflated, it must be replaced by an authorized Audi dealer or
qualified technician who has the technical information , training
and special equipment nece ssary.
• The airbag system can be deployed only once . After an airbag
has been deployed , it must be replaced with new replacement
part s designed and approved especially for your Audi model
version. Replacement of complete a irbag systems or airbag
components must be performed by qualified workshops only .
Make sure that any airbag service action is entered in your Audi
Warranty
& Maintenance booklet under AIRBAG REPLACEMENT
RECORD .
• In accidents when an airbag is deployed , the vehicle battery
s eparates the alternator and the starter from the vehicle electrical
system for safety reasons with a pyrotechnic circuit interrupter.
-Work on the pyrotechnic circuit interrupter must only be
performed by a qualified dealer -risk of an accident !
- If the vehi cle or the circuit interrupter is scrapped , all appli ­
cable safety precautions must be followed . •
Controls and equip­ ment Safety first
Vehicle operation
Other things that can affect Advanced Airbag
performance
Changing the vehicle 's suspension system can cha nge the way that
the Advanc ed Ai rbag Syste m perfor ms in a cras h. Fo r ex amp le,
u sing tire -rim combinations not a pproved by Audi, lowering the
ve hicle , c hang ing the st iffness o f the suspe nsion, inclu din g the
spr ings, s uspension struts, shock absorbers etc. can change the
fo rc es that ar e meas ured by th e a irbag sens ors and sent to the e lec ­
tronic control un it. Some suspens ion changes can, for example,
in crea se th e fo rc e leve ls meas ured by th e se nsors and ma ke t he
airbag system dep loy in crash es in wh ich it wou ld not dep loy if the
c h anges had no t been m ade . Ot her k in ds of cha nge s m ay red uce
the fo rce levels measured by the sensors and p revent t he airba g
fr om depl oyin g whe n it should.
T he sensors in the safe ty b elt b uckle fo r the driver a nd front
passenger seat te ll the electronic control module if the safety belt is
l a tc h e d or not. If the s afe ty be lt is bei ng use d, t he fr ont ai rbag w ill
dep loy at a s lightly higher rate of vehic le dece leration than if the
sa fe ty belt is not be ing used . T here for e, in a partic ular co lli sion , it is
possible t hat an airbag will not dep loy at a seating position w here
the safe ty belt is b ein g us ed b ut will infl ate a t th e po siti on w here the
safety belt is not being used. It is important that nothi ng interfere
with the safety belt b uck les so that the sensors can send the correct
i nformat ion about safety b elt use to the electronic control un it.
& WARNING
Changing the vehicle's suspension including use of unapproved
tire -rim combinations can change Advanced Airbag performance
and increase the risk of serious personal injury in a crash.
• Never install suspension components that do not have the
same performance characteristics as the components originally
installed on your vehicle .
• Never use tire-r im combinations that have not been approved
by Audi. .,.
Vehicle care Do-it-yourself service Technical data

-~_T_ ir_e_ s_ a_ n_d _ w_ h_ e_e _l_s _________________________________________________ _
toring system* would not be able to monitor the tire pressure or
warn you if it is necessa ry.
• T he battery inside of the tire pressure sensor has a limited
service life.
• Always drive with the valve stem caps securely mounted. We
r ecommend us ing facto ry insta lled va lve stem caps. Ask you r autho ­
rized Audi dealer to replace lost va lve stem caps.
T he installation of rep lacement tires with steel cord body p lies in
t he tire sidewall may cause mal functi on of the tir e pressure mo ni­
toring system , and is not recommended (cord material information
in mo lded o n th e ti re sid ewa ll) .
Always check your tire pressure monitoring system * indicator after
r eplacing one or mo re ti res on your veh ic le . I f the ti re p ress ure
m onito ring syste m* ind icator flashes, or is o n, your s ystem is not
wo rking properly . Your replacement t ire might be incompatible with
yo ur tir e pressure mon ito ring system* , o r so me compo nen t of th e
tire p ressure monitoring system * may be damaged .
& WARNING
• Using incorrect or unmatched tires and I or wheels or improper
tire and wheel combinations can lead to loss of control , collision
and serious personal injury .
• Always use t ires , rims and wheel bolts that meet the specifica­
tions of original factory-installed tires or other combinations that
have been specifically approved by the vehicle manufacturer.
• Tires age even if they are not being used and can fa il suddenly,
espe cially at high speeds . Tires that are more than 6 years old can
only be used in an emergency and then with special care and at
lower speed s.
• Never mount used tire s on your vehicle if you are not sure of
their "previous history ." Old used tire s may have been damaged
even though the damage cannot be seen that can lead to sudden
tire f ailure and loss of vehicle control.
& W ARNING (continued )
• All four wheels mu st be fitted with radial tires of the same type,
size (rolling circumference ) and the same tread pattern. Driv ing
with different tires redu ces vehicle h andling and can lead to a loss
of control.
• If the spare tire is not the same as the tires that are mounted
on the vehicle - for e xample with winter tire s - only u se the spare
tire for a short period of time and drive with extra care . Refit the
normal road wheel as soon as safely possible.
• Never drive faster than the maximum speed for which the tires
on your vehicle are rated because tires that are driven faster than
the ir rated speed can fail suddenly .
• Overloading tires cause heat build-up, sudden tire failure ,
including a blowout and sudden deflation and loss of control .
• Temperature grades apply to tires that are properly inflated and
not over or underinflated .
• For te chnical reasons it is not always possible to use wheels
from other vehicle s -in some cases not even wheels from the
same vehicle model.
• If you install wheel trim discs on the vehicle wheels, make sure
that the air flow to the brakes is not blocked. Redu ced airflow to
the brakes can them to overheat , increasing stopping distances
and causing a collision.
• Run flat tire s may only be used on vehicle s that were equipped
with them at the fa ctory . The vehicle must have a cha ssis designed
for run flat tires and a factory -installed tire pressure monitoring
s ystem that indicate s a loss of tire pressure . Incorre ct use of run
flat tires can lead to vehicle damage or accidents . Check with an
autho rized Audi dealer or t ire specialist to see if your vehicle can
be equipped with run flat tires .
If run flat tires are used , they mu st
be installed on all four wheels . Mixing tire types is not permitted. .,

___ A---=- lp_h_ a_b_ e_ t _i_ c _ a_ l_ in_ d_ e_x ______________________________________________ _
Infant seats . . . . . . . . . . . . . . . . . . . . . . . . 195
How do I properly ins tall an infant seat in
my vehicle? ...... .... .... .... .. 195
Safety instructions . . . . . . . . . . . . . . . 195
Inside rear view mirror ..... .. .... .... . 88
Installing child safety seats
Sa fet y bel ts . . . . . . . . . . . . . . . . . . . . . 200
Instruments and controls ............. 12
Genera l ill ustration .... ... .... .... . 11
Illumination ...... ... . ......... 15, 81
Interior lights . ...... ... ........ .... . 84
Luggage compartment .. ...... ... .. 84
J
Jack and tools . . . . . . . . . . . . . . . . . . . . . . 290
Jumpe r cables . . . . . . . . . . . . . . . . . . . . . 305
Jump -starting 304
K
Key ...... ... .... .... .... .... ....... 47
Battery replacement . . . . . . . . . . . . . . . 49
Coded sett ings . . . . . . . . . . . . . . . . . . 110
Conveni ence op ening and closing of pow -
er top . ... .. .... .... .... ........ 63
Convenience opening and closing of w indows ....... ........ .... ... . 53
Emergency key . . . . . . . . . . . . . . . . . . . 47
Key replacement . . . . . . . . . . . . . . . . . . 47
Master key . . . . . . . . . . . . . . . . . . . . . . . 47
Valet key . . . . . . . . . . . . . . . . . . . . . . . . . 47
Key coded s ettings
Clima te con trols ... ...... ... . .... 110 Keyless
entry remote control
Kick -down 48, 51
multitronic® . . . . . . . . . . . . . . . . . . . . 135
tiptronic® ............. .... ... ... 129
Knee airbags . .... ..... .. .... .... ... 184
Description ... ... ... ... .... .... .. 184
How they work . . . . . . . . . . . . . . . . . . . 185
Important safety instructions 186
L
LATCH .................. .... .... .. 205
Description ... ... ... ... .... .... .. 205
Guidance fixtur es for lower anchorages .
206
Installing a child restraint .. .... ... 208
Location ... .. .... .. .. ... .. .. .... 205
Mounting and re leasing the anchorage
hook .... ... .... .. .. .. .. .. .. ... 209
Leather .. ... .. ... .. . ..... .... .... .. 239
Cleaning .............. .... .... .. 240
Leaving-home-function ...... .... .... . 80
Lifting jack .. . ... .... ... .. ...... .... 296
Lifting vehicle . .... ................. 308
Light sensor defec tive . ...... ...... ... 33
Ligh t se nsor package
Auto mat ic headligh t control ... .... . 77
Lights Coming -home /leavi ng-home -function 80
Emergency flasher .......... ...... 82
Front fog lights . ...... .... .... .... 79
Headligh ts . .... ....... .... .... ... 76
High beam .... .... .... .... .... 76 , 83 High bea
m wa rning /indicator light ... 22
Ins trumen t panel illum ination ... .... 81
Side marker lights ..... ... ........ . 76
Turn signals ... .... ... ... . ... ..... 83
Xenon headlights .. .... ... .... .... 82
Load ing the luggag e compartmen t 153
Locking Power locking switch .............. 54
Rear lid .... ... .... ............... 55
R emote control .. .. ........... .. .. 51
Using the key ...... .... ... .... .. .. 53
Lower anchorage locator button ...... 205
Lower universal anchorage (Canada) ... 205
Lower universal anchorage bars (Canada) ...
205
Luggage
Stowing 153
Luggage compartment
Light .......... ....... .. .. .... ... 84
Sk i sack . . . . . . . . . . . . . . . . . . . . . . . . . 103
S ee also Loading the luggage
c ompartment .......... . ... .... 153
Lumbar support . ........... . ... ..... 98
M
Maintenance .. ..... .. .... .... ...... 316
Malfunction Indicator Lamp (MIU .. .. 19 , 27
Manual operat ion
Power top . . . . . . . . . . . . . . . . . . . . . . . . 68
Manual s eats
Adjus ting the h ead restra ints ... .... 95
Fold ing the seatback forward ... ... . 95

Alph ab eti ca l ind ex -
-------------=----
Master key ........ .... . .... .. .. .... . 48
Battery replacement . .... .... ...... 49
Menu button ... .. ...... .... ...... ... 40
Menu display .... .... .... ... .... .... . 39
Mi leage
Average . ...... .. .... .... .... ..... 37
Instantaneous .................... 37
Mi les to empty . ... .. .... .... ...... ... 26
Mirrors Activating the digita l compass ..... . 90
Adjusting the ant i-g lare ... .... .... . 88
Automatic dimming for the outside mirrors . .... .... ....... ....... .. 90
Automatically dimming inside mirror . 88
Inside rearview mirror . .... ...... ... 88
Interior mirror .... .... .... .. ...... 88
Manual glare dimming ............ . 88
Outs ide mirrors . ........ ... .... ... 89
Recalling posit ion of outside mirrors 102
Storing positio n of outside mirrors .. 102
Monitoring the Advanced Airbag System ..
179
multitronic® ... ..... ... .... .... .... 131
Automatic Shift Lock (ASU . .... .... 135
Dr iving the multitronic® . ..... .... . 132
Dynamic shift program ... .... .... . 136
Fail -safe mode ... .... .... .... .... 137
Kick -down ... .... .... .... ... .... . 135
Manual sh ift program .. ...... .... . 136
Selector lever . . . . . . . . . . . . . . . . . . . . 133
Steering wheel with tiptronic® ..... 137
tiptronic .. ... .... .... ... .... .... 136
Controls and equip­
ment Safety first
N
Natural leather
... .... .... .... ... .... 239
New tires and whee ls ...... ... .... ... 279
NH TSA
Contacting . ...... ..... .. .... .... 155
Number of seats .................... 159
0
Occupant seating positions . .... ...... 148
Octane rating .... .... .... .... .... ... 244
Odometer ........ ..... .. .... .... ... . 15
Oil See Engine oi l ....... ....... .. .... 252
O lder chi ldren and safety bel ts . ...... . 199
On -Board Diagnostic System ... .. .. .. .. 28
Electronic speed limiter ............ 28
Malfunction Indicator Lamp (MIU .... 27
On-Board Diagnostic System (OBD) .... . 28
Data Link Connector (DLC) ...... .... 28
Open do or o r rear l id wa rn ing ... .. .... . 26
Opening Power top .... ...... .... ..... .... . 62
Operate your vehicle economically and mini -
mize po llution ...... .... .... .... 221
Optional equipment Marked with an asterisk ... .... .... .. 6
Outlets ... .. .... ..... .. .... .... .... 1 06
Outside air pollution How to prevent from entering the vehicle 113
Outside mirrors ..... .... .... .... .... . 89 Outside temperature display
...... ..... 25
Owner's manual How the Owne r's Manual is orga nized . 6
p
Paint
Touch -up ... .. .... .... ... .... .... 235
Paint No ... ... .... .... ....... .... ... 312
Park assist ... .... .... ... .... ..... .. 122
Parking ...... .... .... ... .... .... ... 1 21
Automatic transmission .. ..... .... 126
multitronic® ....... ... .... .... ... 1 32
Parking brake ........ .... ... ........ 121
B rake warn ing .................... 30
Set ting a nd re leasi ng ..... .... .... 121
Parking light Defective . .... ........ .... ........ 35
Parking on a decline (downhill) ... ... .. 121
Parking on an incline (uphill) ... .... ... 121
Parktronic See Acoustic park assist .. ... ..... . 122
Parts rep lacement . ....... ... .... .... 318
PASSENGER A IR BAG OFF light ........ 180
Passive safety system . .... ...... .... . 146
Pedals . ... .. .... .... .... ... .... .... 152
Physica l principles of a frontal collision . 160
Po lishing ... .. .... .... ... .... .... ... 234
Power lock ing system ..... .... .... .... 50
Conven ience close/open feature .... . 53
Lock ing and unlocking the vehicle fr om
inside ... .... .... ... .... ..... .. . 54
Locking switch .... .... ... .... ..... 5 4
Vehicle operation Vehicle care Do-it-yourself service Technical data