2009 AUDI S4 CABRIOLET immobilizer

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

-~_C_ h_e _c _ k_ i_ n ...,,g,:...._ a_n_ d_ f_ i_ll _in ....;g=---------------------------------------------
Have the battery checked when you take your vehicle in for service .
You are well advised to replace a battery that is older than 5 years.
Disconnecting the battery terminals
Some vehicle functions (power window regulators, for example) are
lost if the battery terminals are disconnected . Th ese functions have
to be relearned after the battery terminals are connected again. To
prevent this, the battery should only be disconnected from the
vehicle electrical system when absolutely necessary for repairs .
Vehicles not driven for long periods
If you are going to let your vehicle stand for a long time and not
drive it, you should remember there are electrical components
which are still functioning and they will draw energy from the
battery and drain it, for example, the engine immobilizer. To prevent
this, you can either charge the battery occasionally to keep it in
good working condition or you can disconnect the negative cable
on the battery.
Winter operation
During the winter months, battery capacity tends to decrease as
temperatures drop. This is because more power is also consumed
while starting, and the headlights, rear window defogger, etc., are
used more often.
Avoid unnecessary power consumption, particularly in city traffic or
when traveling only short distances . Let your authorized Audi dea ler
check the capacity of the vehicle battery before winter sets in
=>
page 265 . A we ll charged battery wil l not only prevent starting
problems when the weather is cold, but will also last longer.
Replacing battery
The new battery must have the same capacity, voltage (12 volts),
amperage, construction and plug sea ling, as the origina l battery.
Specifications are listed on the battery housing. Batteries specially
developed by Audi fulfill the maintenance, output, and safety
requirements. When installing the battery, make sure the ignition and all electrical
consumers are switched off=>
0.
We recommend that you use maintenance -free or cyc le-resis­
tant/leak-proof
batteries according to the standards TL 825 06 (from
December 1997) and VW 7 50 73 (from August 2001).
Replacing the battery should be carried by a qualified workshop.
Please follow the instructions on the battery cover.
0 Note
• All work on the battery requires technical knowledge. Please
contact an Audi dealership or another authorized facility for ques­
tions about the battery -danger of acid burns and exp losion hazard!
• Make sure the ventilation hose on the side of the battery is
connected, otherwise fumes or battery acid can leak out.
• Battery holder and terminals always have to be secured correctly.
• Before all work on the battery follow the
warnings below=> & in
"Working on the battery" on
page 263.
Because of the problem of proper disposal of a battery, we recom­
mend your authorized Audi dealer change the battery for you.
Batteries contain sulfuric acid and lead and must always be
disposed of properly in compliance with all environmental regula ­
tions . Disposing of vehicle batteries improperly is very dangerous to
the environment . Make sure that the removed battery cannot over ­
balance, otherwise sulfuric acid might escape!
[ i ] Tips
If your vehicle is left standing for several weeks at extremely low
temperatures, the vehicle battery should be removed and stored
where it will not freeze. This will prevent it from being damaged and
having to be replaced.•

llffl __ A_l-=- p _h_ a_ b_e _t_ic _ a_l _in _ d_e _x ____________________________________________ _
A
Accessories . . . . . . . . . . . . . . . . . . . . . . . . 318
Acoustic park assist . . . . . . . . . . . . . . . . . 122
Adaptive Light Air outlets
Climate controls .. .... ...... ..... 115
How should I adjus t the air outlets to de­
frost my windows as quickly as
possible? . . . . . . . . . . . . . . . . . . . . . . 115 Warning/indicator lights
... ... .... .. 20
When must the system be inspected? . ..
179
All Wheel Drive ... .... .... ...... .... 218
Alloy wheels . . . . . . . . . . . . . . . . . . . . . . . 237
defective ............. ........ .. . 34 Air quality sensor .
.... .... .... .... .. 114 All-whee l drive
adaptive light .. ... .... .... ... ...... . 79 Air recirculation
............... ..... 113
Winter tires .. ......... .... .... .. 284
Adding Engine coolant ... .... .... ...... .
259
Engine oi l ..... .... ... .... .... .. .
255
Windshield washer fluid .... .... . .
266
Additiona l accessories .. ...... ...... . 318
Additives Engine oil . ..... .. ..... ... ...... . 255
Adjusting Instrument cluster illumination .. .... 15
Steering wheel co lumn .... ... .... 118
Adjusting the seats
Manual seats ...... .... ........... 94
Advanced Airbag System . . . . . . . . . . . . 172
Children ... ........... .... ... ... 191
Components ...... .... .......... 175
Front airbags . . . . . . . . . . . . . . . . . . . . 173
How the components work together 176
Monitoring . . . . . . . . . . . . . . . . . . . . . . 179
Weight -sensing mat . .... ... .. .... 191
Air conditioning
See Climate controls . . . . . . . . . . . . . . 110
Air distribution Clima te con trols ... .... ... .... ... 114 Climate controls
...... ...... ... .. 114 Alternator
When should I use the air recircu lation?
114
Air ventilation in the glove compartment ...
108
Airbag system ..... ... .... ..... . 168, 188
Care ... ... .... .... .... .... .... .. 182
Child restraints .............. .... 192
Components (front airbags) .. ... ... 175
Danger of fitting a child safety seat on the
front passenger seat . . . . . . . . . . . . 170
Disposal . . . . . . . . . . . . . . . . . . . . . . . . 182
Front airbags . ....... ..... .... ... 172
How do the front airbags work? . . . . 177
How many airbags does my vehicle have? 175
Important safety instructions on the knee
airbag system .... .... .... .... .. 186
Important things to know ... .... .. 168
Indicator light ... .......... ... ... 179
Knee airbags .... . .. .. ........... 184
Monitoring .... .... .... .... .... .. 179
PASSENGER AIR BAG OFF light ..... 180
Repairs . . . . . . . . . . . . . . . . . . . . . . . . . 182
Side airbags . . . . . . . . . . . . . . . . . . . . . 187
See Generator . . . . . . . . . . . . . . . . . . . . 22
Anti -freeze
S ee Engine coolant system .. ...... 257
Anti-glare inside day-night mirror ...... 88
Anti-lock brake system How the ABS system works . .... ... 216
Warning/indicator lights ........... . 20
An ti- Slip Regulation System (ASR)
How the sys tem works .. ... .... ... 214
Anti-Theft Alarm System Tilt sensors ..... ....... ..... ...... 58
Anti-theft alarm system .. .. .. .... .... . 57
Anti -theft systems
Electronic immobilizer ......... .... 49
Armrest Adjusting ...... .... ..... .. ..... . 100
Storage bin
Ashtray 100
Front ....... .................... 104
Rear .......... .... .... ........ .. 105
Asterisk What does it mean when something is marked with an asterisk? . ..... ... .. 6
Audi Service Repair Manuals and Literature 316

Alph ab eti ca l ind ex --------------=-----
Convertible locking retractor
Activating ...... ... .. .... ...... .. 202
Deactivating .. ... ..... ..... .. ... . 203
Using to secure a child safety seat 200 ,
202
Convertible top ........ .... .... .... .. 61
Coolant system
Cooling System 257
Expansion tank ... .... ...... .... .. 258
cornering light . .......... .. .... .... .. 79
Cruise control .. ... ... ...... ...... .. 123
Changing a stored sp eed . .... .... . 124
Setting and storing a vehicle speed . 124
Switching off .................... 125
Switching off temporari ly .. ........ 124
Switching on .... .... .... ...... .. 124
Warning/indicator lights ... ... .... .. 20
Cruising range .. .... .... .... ...... ... 37
Cupholder . ... .. ...... ..... .. .. .... 104
D
Data . .... ... . ... .. ... ... .... ..... . 314
Data recorder ... .... ...... ..... .... . 212
Date dis play . . . . . . . . . . . . . . . . . . . . . . . . . 14
Daytime running lights ... .. ... .. ... ... 78
Declaration of compliance Cell phone package .. .. .... .... ... 320
Elect ronic immobilizer . ..... .. .... 320
Homelink® universal remote con trol 320
Remote control key .. .... .... .... . 320
Tire pressure monitoring system ... 320
Controls and equip­
ment Safety first
def
Dublicate key ... ...... ... .. . ... .... .. 47
What does this mean when it appears in
Dynamic shift program ....... ... ... . . 136
the trip odometer display? .. ...... . 15
Defogging the windows . ....... ..... . 116
E
Defrosting the windows .. ... ..... ... . 116
Determining correct load lim it ... .... . 276 ECON
Digi tal clock ............. .. ... ... .... 14 When should I use ECON?
... .... .. . 113
Setting the time ......... .... .... .. 14 EDL
Digital compass . ... ... . ... ... .. .... .. 90 See Electronic differential lock (EDU . 213
Dimensions ..... .... .... .... .... ... 313 Electric roof .
..... ... ..... .. .... .... . 61
Dipstick Electrically heated front seats .
.. .... .. 116
Reading the dipstick properly ...... 254 Electronic differential lock
Distance ... .... ... ... .. ... .... .... .. 38 Warning/indicator
lights ..... ... .... 20
Doors, power locks ........ ....... .... 53
Driver Electronic differ
ential lock (EDU
How the system works ...... .. .... 213
See S eating position .. ... ... ... ... 148 Electronic immobilizer ..
.. .. . .. .. .. 15, 49
Driver information dis play
Miles (kilometers) to empty .. .. ... .. 26 Electronic power control
EPC warning/indicator light ......... 22
Parking brake warning ... ... ..... .. 30 Electronic sp
eed limiter ..... .. .... .... 28
D river information sys.tern . .... ...... .. 24 Electronic stabilization program (ESP)
Driver information messages .. .... .. 29 How the system works ...
..... .. .. 212
Fuel filler cap . .. . ........ ....... .. 27 Elec
tronic stabiliza tion program (ESP)
Menu button .... . .. .. .... .... .... . 40 Warning/indicator lights
.... ...... .. 22
Menu display .... ... .... .... . ... .. 39 Emerg
ency flasher ... .... ... .. ....... 82
Open door or rear lid warning ...... . 26 Warning/indicator
lights .... ...... .. 21
Outside temperatu re disp lay ... ..... 25
Emergency locking . .... .... ... .. .. . .. 55
Sound system display .... .... .... .. 25
Emergency starting ..... ....... .. .... 304
Driver's seat memory ... .... .... ..... 101
Emergency towing . .. ... .. .. .... .... 306
Recalling a seat position .... .... ... 102
Engine
Storing a seat position ... ... .... .. 102
4-cylinder (200 hp) . ... .. .. .... .. .. 251
Driving messages ...... ........ ..... . 29
6-cylinder (255 hp) . ... .. .. .... .. .. 252
Driving safely . ... .. . ... .. .... .... ... 146
Compartment .... ... .. ...... .... . 251
Driving time . .... ...... .... ... .. .... . 37 Coolant ...
.. ... .... .... .... ..... 257
Vehicle operation Vehicle care Do-it-yourself service Technical data