2021 AUDI E-TRON electrical system

4KE012721BF
Checking and Filling

> Read the brake fluid level on the brake fluid res-
ervoir > page 235, fig. 151. The brake fluid lev-
el must be between the MIN and MAX markings
>A.
The brake fluid level is monitored automatically.
Messages
Ga i @ Brakes: stop vehicle and check brake
fluid level
Stop the vehicle and check the brake fluid level.
See an authorized Audi dealer or authorized Audi
Service Facility for assistance.
Changing the brake fluid
Brake fluid should be changed at regular inter-
vals. Have the brake fluid changed by an author-
ized Audi dealer or authorized Audi Service Facili-
ty. The authorized Audi dealer or authorized Audi
Service Facility will inform you of the replace-
ment intervals.

ZA\ WARNING
— If the brake fluid level is below the MIN
marking, it can impair the braking effect and
driving safety, which increase the risk of an
accident. Do not continue driving. See an au-
thorized Audi dealer or authorized Audi
Service Facility for assistance.
— If the brake fluid is old, bubbles may form in
the brake system during heavy braking. This
could impair braking performance and driv-
ing safety, which increases the risk of an ac-
cident.
— The brake fluid in your vehicle must meet
the standard VW 501 14 and is available at
an authorized Audi dealer or authorized
Audi Service Facility. If this brake fluid is not
available, another high-grade brake fluid of
equivalent quality may be used, and it must
meet the U.S. Federal Motor Vehicle Stand-
ard (FMVSS) 116 DOT 4, Class 6.

@) Note
— If the brake fluid level is above the MAX
marking, brake fluid may leak out over the
edge of the reservoir and result in damage
to the vehicle.
— Do not allow any brake fluid to come into
contact with the vehicle paint, because it
will corrode the paint.
Electrical system
If the = / B or [am] indicator light turns on,
there is a malfunction in the power supply, the
battery, or the vehicle electrical system.
= / B Electrical system: malfunction! Safely
stop vehicle
Do not continue driving and switch the ignition
off > A\. See an authorized Audi dealer or author-
ized Audi Service Facility for assistance.
= Electrical system: malfunction! Restart not
possible. Please contact Service
If you switch the ignition off, you will not be able
to restart the vehicle. Vehicle functions or driving
stability may be limited. Drive to an authorized
Audi dealer or authorized Audi Service Facility im-
mediately.
= Electrical system: malfunction! Please con-
tact Service
Switch off all electrical equipment that is not
needed. If necessary, some equipment will be
switched off automatically. Vehicle functions or
driving stability may be limited. Drive to an au-
thorized Audi dealer or authorized Audi Service
Facility immediately.
= Electrical system: low battery charge. Bat-
tery
will be charged while driving
If this message turns off after a little while, the
vehicle battery has been charged enough by the
high-voltage battery while driving.
If this message does not turn off, drive immedi-
ately to an authorized Audi dealer or authorized
Audi Service Facility.

Z\ WARNING
When there is an electrical system malfunc-
tion, vehicle functions may not work and driv-
ing stability may be limited, which increases
the risk of an accident. Do not continue driv-
ing and switch the ignition off. See an

237

Checking and Filling


authorized Audi dealer or authorized Audi
Service Facility for assistance.

Battery
eae elec acl)
Because of the complex power supply, all work on
batteries such as disconnecting, replacing, etc.,
should only be performed by an authorized Audi
dealer or authorized Audi Service Facility > A\.
Batteries with different technologies are instal-
led in your vehicle:
— 12 volt vehicle battery (for example, for basic
power supply) > page 238, 12 Volt vehicle bat-
tery
— High-voltage battery (for example, for electric
drive system, climate control) > page 108, In-
troduction
Not running the vehicle for long periods of
time
When the vehicle is not used for long periods, the
12 Volt vehicle battery will drain little by little. To
ensure that the vehicle can still be started, the
electrical equipment will be limited or switched
off. Some convenience functions, such as interior
lighting or power seat adjustment, may not be
available under certain circumstances. The con-
venience functions will be available again when
you establish drive ready mode.
Even when electrical equipment is switched off,
the equipment can still drain the 12 Volt vehicle
battery if the vehicle is not driven for long peri-
ods of time. Deep draining results in a chemical
reaction that destroys the inside of the battery.
To reduce the risk of this, the battery must be
charged monthly by an authorized Audi dealer or
authorized Audi Service Facility > page 239. Con-
tact an authorized Audi dealer or authorized Audi
Service Facility for more information.
Winter operation
Cold weather places an especially high load on
the 12 Volt vehicle battery. Have the battery
checked by an authorized Audi dealer or author-
238
ized Audi Service Facility before cold weather be-
gins.

ZA WARNING
All work on the battery or electrical system in
your vehicle can result in injuries, chemical
burns, accidents, or burns. Because of this, all
work must be performed only by an author-
ized Audi dealer or authorized Audi Service Fa-
cility.

ZA WARNING
California Proposition 65 Warning:
— Battery posts, terminals and related acces-
sories contain lead and lead compounds,
chemicals known to the State of California
to cause cancer and reproductive harms.
Wash hands after handling.
@) Note
If the vehicle will be parked for long periods
of time, protect the 12 Volt vehicle battery
against the cold so that it will not “freeze”
and become damaged. Have the battery
charged by an authorized Audi dealer or au-
thorized Audi Service Facility > page 239,
Charging the 12 Volt vehicle battery.
AAO) CM alate ey pan-18 7
Explanation of warnings:


Always wear eye protection.

Battery acid is highly corrosive. Always
wear protective gloves and eye protection.

Fire, sparks, open flame, and smoking are
forbidden.

A highly explosive mixture of gases can
form when charging batteries.

Always keep children away from battery
acid and the battery.

Always follow the instructions in the oper-
se
@
> @
PE
©

ating manual. >

4KE012721BF
Fuses and bulbs

Fuses and bulbs
Fuses
erate mie

Fig. 172 Right side of the motor compartment: fuse panel
cover @)


Fig. 173 Front passenger footwell: cover and clip Q), left
side of the luggage compartment: cover @)
A fuse that has blown will have metal strips that
have burned through.
The fuses are located on the right side of the mo-
tor compartment (@ in the front passenger foot-
well @), and under the left side of the luggage
compartment @).
> Switch the ignition and all electrical equipment
off.
> Check the table that follows to see which fuse
belongs to the equipment.
> Remove the screwdriver from the vehicle tool
kit > page 267.
> Remove the appropriate cover.
> Remove the colored plastic clip from the fuse
panel, if necessary.
> Remove the clip from the fuse panel in the
front passenger’s footwell @).
> Remove the fuse using the clip.
>» Replace the blown fuse only with a fuse that
has the same amp rating.
> Reinstall the plastic bracket.
> Install the cover.
Fuse color identification








Color Current rating
in amps
Black 1
Gray 2
Purple 3
Pink 4
Light brown 5
Brown 16d)
Red 10
Light blue 15
Yellow 20
White or transparent [25
Light green 30
Teal 35
Orange 40
Z\ WARNING
Do not repair fuses and never replace a blown
fuse with one that has a higher amp rating.
This can cause damage to the electrical sys-

tem and increases the risk of fire.

Qo Note
If a new fuse burns out again shortly after you
have installed it, have the electrical system
checked as soon as possible by an authorized
Audi dealer or authorized Audi Service Facili-
ty.
277

4KE012721BF
Fuses and bulbs


Fuse panel (2) (black) Fuse panel (4) (brown)

9 |Instrument cluster No. | Equipment

10 | Volume control Right front safety belt tensioner

11 | Light switch, switch panels Left front safety belt tensioner

12 | Steering column electronics Air suspension/suspension control

15 |Steering column adjustment Right headlight

16 | Steering wheel heating Left headlight


Fuse panel 2) (black)
Left rear door control module


No. | Equipment
WOl/@OIN|
A)
M|AILN
Right rear door control module


10 | Infotainment system


























1 |Front seat heating - -
> |Cimateconerl system 11 Exe Sealealite systems control module
3 |Left headlight electronics 12 | Diagnostic interface
4 |Panoramic glass roof Fuse panel (5) (black)
5 |Left front door control module No. | Equipment
6 | Sockets 1 Seat electronics, front seat ventilation,
8 | Instrument panel rearview mirror, diagnostic connection
9 | Right headlight electronics 2 Vehicle electrical system control module,
Windshield washer system/headlight diagnostic interface
10 washer system 3 | Exterior sound generator
12 | Parking lock 5 | Electric drive system
raven 6 | Traffic information antenna (TMC)
Fuse panel (8) (re
ueeiP eed) 7 |Active accelerator pedal
No. | Equi it
o. atipmen 8 | Night vision assist
1 |Anti-theft alarm system - - -
9 |Adaptive cruise assist
2 |Drive system control module , - . -
ll Driver assistance systems, intersection as-
3_| Emergency call module sistant control module
4 | Selector lever 15 |USB input
5 |Horn
6 | Parking brake Fuse assignment - luggage compa
7 High-voltage battery, battery monitoring
control module

8 | Roof electronics control module

10 | Airbag control module

11 | Left front lumbar support

12 | Diagnostic connection, light/rain sensor

14 | Right front door control module

15 | Climate control system compressor


16 | Climate control system blower

5 iF
| | eo ed oO
' rR mae Y= ae
aR EE


Fig. 177 Left side of the luggage compartment: fuse panel
with plastic clip
279
>

4KE012721BF
Index

Drives
refer to Media.............000eee 215, 218
Drive select
refer to Audi drive select............... 102
Drive systeM.... eee cee eee eee ee 94
Audi drive Sel@¢t ecw. « 2 cep = 2 oxyye « 2 ses 102
Emergencyote ccs « cae » x cnn» « wm a x 90
Switching on and off................-.. 90
Driving down hills............ 0... e eee 100
Driving program...........e eee eee 93,152
Driving through water................0. 101
DIVING LIMES. 5 cases 6 o erasers oo aricens ov & erates & 8 Y 14
Driving tips
Driving through water...............0- 101
Efficient driving.................. eee 96
Offroad driving sss + ¢ saws x eres so ewes 100
Uphill and downhill................... 100
Drivingeup Wills'. = sccvsie e sewn «x cowie io cee 100
DVD AIIVGs. . & weson 6 2 avin 4 a worcias oo comm eo 216
E
EsMails s « moos « 9 maw 3 2 aes = garem 2 2 nae 4 184
EDL
refer to Electronic Differential Lock...... 105
EDR
refer to Event Data Recorder (EDR)...... 281
Efficiency assist.............002.000005 142
Predictive control.................005 148
Electrical system... 2... cee eee ee eee ee 237
Electric drive system. ............000000- 94
Electric motor
Coolant........ 2.0... ce eee eee eee eee 235
Electric range... 2. eee eee eee eee 202
Electromechanical parking brake.......... 98
Electronic Differential Lock.............. 105
Electronic immobilizer.............0.0005 37
Electronic Stabilization Control........... 105
Embedded SIM card sewy: s = saws s 2 mews so oe 187
Emergency assiStuss « 2 mes ¢ 2 wees zs mem ¢ 164
Emergency assistance.................. 267
Emergency braking function.............. 99
Emergency call.............000005 182,191
Emergency flashers..............00 eee ee 50
Emergency Mode iiss a + snus i 0 mses + 6 amenae « 3 94
Emergency operation
DOOrs .. eee eee 35
Luggage compartment lid............... 42
Panoramic glass roof...............200. 45
Energy
Current consumption..............0000. 14
Reducing consumption................. 96
Energy recovery............0.00-00 ee eee 94
Engine braking effect
refer to Recuperation................4. 94
Engine start system...............0.000. 91
Entry/exit lighting................-.000- 50
Entry assistance...................0000- 61
also refer to Exit assistance............. 61
ESC
refer to Electronic Stabilization Control... 105
ESC Offf6dd ows « « mews sa wows + o eee ve wee 106
eSIM
refer to Embedded SIM card............ 187
Event Data Recorder (EDR).............. 281
EXit ASSIStANGE wens + i seers « & gees og eee Es 61
EXIC WanniiG:cs + « xeme + & eavas 3 & Same & ¥ oes 162
Exterior antenna........... eee cece eens 178
Exterior lighting. .................0.000. 48
Exterior mirrors... 02.0... 0.00 eee eee ee 52
FolditigsettingS a ¢ scaa ss ieee es reese 33
External voice operation................. 26
F
Factory default settings
Multi Media Interface................. 229
RaSUTOOLG « scams 3 & Seeon & § SeaoR Ys GHEE Tt RG 195
Favorites... . eect eee eee 19
Bluetooth): : «sss ¢ : seees : pean a s weeps 2s 231
Navigation i « suns + x oss % 8 mossy oo anese 196
Telephone........... 0... e eee eee ee 180
Federal Communications Commission (FCC) . 288
File formats (media drives).............. 223
Fog WINdOWS)vscns x 2 averse oo seusiee v8 aeanavk «a vee 86
Folding the rear seats... evi 6 6 ewes ven 82
Footwell temperature................... 87
For the sake of the environment
LO AKStecs sv seco © wteuene % o crete w # anc ww eee 234
Forward gear
referto Gear. i... . eee eee eee 92
295