2018 AUDI A4 battery replacement

Opening and clo sin g
@ Tips
The replacement battery must meet the same
specifications as the orig inal battery in the re­
mote control key.
Unlocking/locking by remote control
I rn
F ig . 27 Re mote contro l key: bu tton programm ing
• To unlock the vehicle, press the 6:l button
¢ fig. 27.
• To lock the vehicle, press the {D button on ce.
• To unlock the luggage compartment lid, press
the
a button briefly .
• To open the luggage compartment lid, press
and hold the
a button for at least one second .
• To trigger the alarm, p ress t he red I PANIC I but­
ton. The ve hicle horn and emergency flashers
turn on.
• To switch off the alarm, p ress the red I PANIC I
button again .
I f the ve hicle is unlocked and none of the doors,
the hood, or the luggage compartment lid are
opened within 45 seconds, the vehicle locks
again automatica lly. This feature prevents the ve­
hicle from being accidentally left unlocked over a long per iod of time.
The settings in the Infotainment system deter­ mine if the entire vehicle or only the driver's door
is unlocked when unlocking the vehicle
¢page 41.
A WARNING
No one, especially chi ldren, should stay in the
vehicle when it is locked from the outside, be­ cause the w indows can no longer be opened
from the
inside¢ page 42. Locked doors
40
make it more difficult for emergency workers
to get into the veh icle, wh ich puts lives at
risk.
@ Tips
- Only use the remote control key when you
are within view of the vehicle.
- Applies to: vehicles with automatic trans­
mission: the vehicle can only be locked
when the selector lever is in P.
- Do not use the remote control when you a re
inside the vehicle. Otherwise, you could un­
intentionally lock the vehicle. If you then try
to open a door, the anti-theft alarm w ill
trigger. If this happens, press the unlock
button
6:l.
- Only use the pan ic function in an emergen­
cy.
Unlocking/locking with the convenience
key
Applies to : vehicles with convenience key
The doors and luggage compartment lid can be
unlocked/locked without using the remote con­
trol key.
F ig . 28 Door ha nd le: locki ng t he veh icle
Unlocking the v ehicl e
• Grip the door hand le . The door unlocks auto-
matically.
• Pull on the door handle to open the door.
Locking th e vehicle
• Applies to: veh icles with automatic transmis­
sion : Se lect the P position, otherwise the vehi -
cle will not lock .
.,.

K
Key....... .. .. ................ ..... .. 38
Key not recognized . . . . . . . . . . . . . . . . . . .
85
Key replacement . . . . . . . . . . . . . . . . . . . . . 38
Mechanical key . . . . . . . . . . . . . . . . . . . .
38, 39
Replacing the battery . . . . . . . . . . . . . . . . . 39
Unlocking/locking . . . . . . . . . . . . . . . . . 40, 42
Vehicle code . . . . . . . . . . . . . . . . . . . . . . . . . 38
Kick-down (automatic transmission) . . . . . . .
95
Knee airbags . . . . . . . . . . . . . . . . . . . . . . . . . 287
Description . . . . . . . . . . . . . . . . . . . . . . . . . 287
How they work . . . . . . . . . . . . . . . . . . . . . . 288
Important safety instruct ions . . . . . . . . . . 289
L
Lane assist
refer to Audi active lane assist . . . . . . . . . 125
Lap timer . . . . . . . . . . . . . . . . . . . . . . . . . . . . 106
Evaluating . . . . . . . . . . . . . . . . . . . . . . . . . 106
Starting . . . . . . . . . . . . . . . . . . . . . . . . . . . 106
LATCH · · · · · . .... ............. .. .. .. . 309
Descr iption . . . . . . . . . . . . . . . . . . . . . . . . . 310
Install ing a child restraint ............ . 311
Location
· · . .. ..... ....... ... .. .. .. . 310
Mounting and releasing the anchorage
hook
. . .. .. .... ............. .. .. .. . 311
Launch control program . . . . . . . . . . . . . . . . . 95
Leather care/cleaning . . . . . . . . . . . . . . . . . 357
Left contro l button ............. .. .. .. .. 14
License agreement (MMI) . . . . . . . . . . . . . .
253
Lifting points (vehicle jack) ....... ..... . 364
Light/rain sensor
Headlights . . . . . . . . . . . . . . . . . . . . . . . . . .
54
Interval mode (w ipers) . . . . . . . . . . . . . . . . 60
Light functions . . . . . . . . . . . . . . . . . . . . . . . . 54
High beam assistant
55
Instrument illum ination . . . . . . . . . . . . . . . 58
Interior lighting . . . . . . . . . . . . . . . . . . . . . . 57
Lighting
Exterior
· · · · · · · · · · · · · · · · · · · · · · . .. .. .. 54
Interior . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 7
Lights
~ Headlight range control system . . . . . . . . . 54
;::; Listening to mus ic ,....
8 refer to Media .. ............. .. . 227 , 236
3 Loading the luggage compartment . . . . . . . 259
Index
Locking/unlocking
By remote control . . . . . . . . . . . . . . . . . . . . 40
With the centra l locking switch . . . . . . . . .
41
With the convenience key . . . . . . . . . . . . . . 40
With the lock cylinder . . . . . . . . . . . . . . . . .
42
Low beam headlights . . . . . . . . . . . . . . . . . . . 54
Luggage compartment . . . . . . . . . . . . . . . . . . 70
Cover..... .. .. .. .. ............. .. .. . 70
Pass-through . . . . . . . . . . . . . . . . . . . . . . . . 73
Socket.. .. .. .. . ............ .... .. .. . 68
Storing cargo correctly . . . . . . . . . . . . . . . 259
Tie-downs . . . . . . . . . . . . . . . . . . . . . . . . . . . 73
Val et parking function . . . . . . . . . . . . . . . . . 51
also refer to Loading the luggage compart-
ment ..... .. .. .. ................. ..
259
Luggage compartment lid . . . . . . . . . . . . . . . 43
Emergency release . . . . . . . . . . . . . . . . . . . . 47
Lumbar support . . . . . . . . . . . . . . . . . . . . . . . 65
M
Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . 383
Maintenanc e intervals . . . . . . . . . . . . . . . . . 333
Making an emergency call . . . . . . . . . . . . . . 180
Malfunc tion indicator lamp (MIL) . . . . . . . . . 24
Map
Display
219
Operating . . . . . . . . . . . . . . . . . . . . . . . . . . 214
Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . 215
Update . .. .. .. .. ............... .. ..
204
Mapupdate ... .. .. .................. . 217
Mechanical key . . . . . . . . . . . . . . . . . . . . . 38, 39
Media ... .. .. .. .. ............... 227, 236
Drives · · · · .. .. .. .. ....... ........ .. 228
Supported formats . . . . . . . . . . . . . . . . . . 242
Media center .. .. .. .. ............... .. 237
Memory buttons
refer to Shortcut keys . . . . . . . . . . . . 155, 162
Memory capa city
D. ,rectory . . . . . . . . . . . . . . . . . . . . . . . . . . . 185
Jukebox . . . . . . . . . . . . . . . . . . . . . . . . . . . . 229
Memory card SD card reader (MMI) . . . . . . . . . . . . . . . . .
228
Supported types/formats . . . . . . . . . . . . . 242
Memory function . . . . . . . . . . . . . . . . . . . . . . 67
MENU button
· · · · · · · · · · · · ·........ ... 155
393

Index
What happens if you wear your safety belt too
loose? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
267
What happens to unbelted occupants? . . . . 264
What impairs driving safety? . . . . . . . . . . . . 254
Wheel bolts . . . . . . . . . . . . . . . . . . . . . . . . . 349
Wheel replacement . . . . . . . . . . . . . . . . . . 363
Wheels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 334
Clean ing . . . . . . . . . . . . . . . . . . . . . . . . . . . 355
Glossary of tire and loading terminology . 336
Replacing . . . . . . . . . . . . . . . . . . . . . . . . . . 363
Tire pressure monitoring system . . . . . . . 352
Tires and vehicle load limits . . . . . . . . . . . 347
Wheel wrench . . . . . . . . . . . . . . . . . . . . . . . . 360
When must a safety belt be replaced? . . . . 265
When must the airbag system be inspected? 283
Where are lower anchorages located?
310
Wi-Fi
Audi music stream .. .......... .... ...
231
Audio player .. ... ............ .... .. . 231
Hotspot . . . . . . . . . . . . . . . . . . . . . . . . . . . 194
Online media . . . . . . . . . . . . . . . . . . . . . . . 232
also refer to Wi-Fi . . . . . . . . . . . . . . . . . . . 231
Windows
Child safety lock . . . . . . . . . . . . . . . . . . . . . . 48
Cleaning/removing ice . . . . . . . . . . . . . . . .
356
Defrosting . . . . . . . . . . . . . . . . . . . . . . . . . . 78
Power windows . . . . . . . . . . . . . . . . . . . . . . 48
Windshield Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . .
60
Defrosting . . . . . . . . . . . . . . . . . . . . . . . . . . 78
also refer to Windshield . . . . . . . . . . . . . . . 60
Windshield washer system . . . . . . . . . . 60, 332
Reservoir capacity . . . . . . . . . . . . . . . . . . . 381
W indshield wipers . . . . . . . . . . . . . . . . . . . . .
60
Winter operation
Car washes . . . . . . . . . . . . . . . . . . . . . . . . .
354
Cooling system . . . . . . . . . . . . . . . . . . . . . . 329
Defrosting the windows . . . . . . . . . . . . . . . 78
Removing ice from w indows . . . . . . . . . . .
356
Seat heating . . . . . . . . . . . . . . . . . . . . . . . . . 78
Snow chains . . . . . . . . . . . . . . . . . . . . . . . .
350
Steering wheel heating . . . . . . . . . . . . . . . . 79
Tires . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 349
Vehicle battery .... ........... .... ... 331
Windshield washer system . . . . . . . . . . . . 332
Winter tires . . . . . . . . . . . . . . . . . . . . . . . . . . 349
400
X
Xenon headlights . . . . . . . . . . . . . . . . . . . . . 373
z
Zooming (map) .. .. .. .. ........... 206, 214