2015 AUDI A3 relay

198 Trailer towing
Trailer towing Driving with a trailer
General information
Your Audi was designed primarily for passen­
ger transportation .
If you plan to tow a tra iler, p lease remember
that the addit ional load will affect durability,
economy and performance .
T railer towing not on ly places more stress on
the vehicle, it also calls for more concentra­
tion from the driver.
F or this reason, always fo llow the operating
and drivi ng in str uctions provided and use
common sense.
@ Note
If you are going to tow a trai le r, you must
activate the trailer operation mode
c:::> page 198 , Operating instructions.
Technical requirements
Traile r hitch
Use a weight-carrying hitch conforming to the
gross trailer weight. The hitch must be suita­
b le for your veh icle and trailer and must be
mo unted secure ly on the ve hicle's chassis at a
technically sound loca tion . Use only a trailer
hi tch with a removab le ball moun t. A lways
check with the tra ile r hitch manufac turer to
make sure that you are using t he cor rect
hitch.
Do not use a bumper hit ch .
The hitch must be installed in such a way that
i t does not interfe re with the impact-absorb­
ing bumper system. No modifications should
be made to the vehicle exhaust and brake sys ­
tems . From time to time, check th at a ll hitch
mo unt ing bo lts remain securely fastened.
When you are not towing a trailer, remove the
tra iler hitch ball moun t. T his prevents the
h itch from causing damage sho uld your veh i­
cle be str uck from be hind
c:::> A .
Trailer brake s
If your trailer is equipped wi th a b ra ki ng sys­
tem, c heck to be sure t hat i t conforms to all
regulations .
T he trailer hyd rauli c brake system mus t not be
direc tly connec ted to the vehicle's hydraulic
brake system .
Safety chains
Always use safety chains between your veh icle
and the tra ile r.
Trailer lights
Trai ler lights must meet all regulations. Be
sure to check w ith your Audi dealer for correct
wiring, switches and relays .
Mirrors
If you are unable to see the traffic behind you
us ing the regular o utside mirrors, then you
must install extended mirrors. It is important
that you
always have clear v is ion to the rear.
A WARNING
--
Afte r removi ng the trailer hitch, do not
stor e it in your vehicle . In case of sudden
b raking, t he hitch co uld fly forwa rd and i n­
j ur e you or your passengers.
Operating instructions
Maximum trailer weight
A tra ile r fo r your vehicle is limited to a typical
class 1 or class 2 tr ailer.
Trailer load distribution
Be sure the load in the tra ile r is held secure ly
i n place to p revent it from shift ing forward,
backward or sideways.
Ne ver allow a pa ssenger to ride in a trailer
c:::> A in Driving instructions on page 199 .
Engine cooling system
Towing a trailer makes the engine work hard­
er . It is important that the cooling system's
performance is up to the additional load.

Battery charging (Ma ximum charging rate
o f 30 am ps/ 14.8 volt s)
When charging at
low voltages (e.g . with a
tri ckle ch arg er), the batte ry cables do not
have to be d isconnected first. The battery
caps should
not be opened when charging a
battery .
It is not necessary to remove the battery from
the luggage compartment, and it is also not
necessary to disconnect the cables.
F ast charging th e battery (charging rate
a bo ve 14 .8 volt s)
For technical reasons do not use a battery
charger that uses voltage greater than 14.8
volts to charge your ve hicle 's battery .
A WARNING
Charging a battery can be dangerous .
- Always follow the operating instructions
provided by the battery charge r manu­
fact urer when charging your battery .
- Never charge a frozen battery . It may ex ­
plode because of gas t rapped in the ice .
Allow a frozen battery to thaw out first.
- Do not reuse batteries which we re fro ­
zen . The batte ry housing may have
cr acked and weakened whe n the battery
froze.
- Charge the battery in a we ll ventilated
area. Keep away from open flame o r ele c­
trical spark. Do not smoke. Hydroge n gas
generated by the battery is exp losive.
- T o redu ce the danger o f explosion , never
conne ct or disconnect cha rger cables
wh ile the charger is operating .
- F ast charg ing a battery i s dangerous and
sho uld on ly be attempted by a compe­
tent technician with the proper eq uip ­
me nt.
- Battery acid that may spill during charg ­
ing should be washed off with a so lution
of warm water and ba king soda to neu­
tralize the acid.
Checking and Fillin g 223
@ Note
Neve r use a fast charger as a booster to
start the eng ine . This w ill seriously dam­
age sens itive e lectronic components, such
as contro l units, relays, radio, etc., as well
as the batte ry charger .
Battery replacement
The new ba ttery mus t hove the some specifi­
cations and dimensions as the original equip­
ment battery .
Intelligent energy management in your vehi­
cle is responsible for distributing the electri­
ca l ene rgy throughout your vehicle
~ page 190 . The intelligent energy manage­
ment system will keep the engine battery
c h arged better than vehicles without this sys­
tem. To make sure the addition al ele ctri cal e n­
ergy is ava ilab le once again after yo u have
changed the batte ry, we recommend that you
insta ll batteries of the same type an d manu­
facture on ly (the same as those insta lled at
the time your veh icle was delivered) . Specif i­
cations are listed on the battery housing. Your
authorized dea ler must code the battery in
the ene rgy management system to enab le you
to use the ene rgy management functions cor­
re ct ly afte r repla cing the battery.
The new battery must have the same capacity,
vo ltage ( 12-volts) , amperage, construction
and plug sea ling .
When install ing the battery, make sure the ig­
nition and a ll electrical consumers are switch ­
ed off .
~ Note
Make sure the ventilat ion hose on the side
of the battery is con nected, otherwise
fumes o r batte ry acid can lea k out.
@) For the sake of the environment
Because of the prob lem of proper disposal
of a battery, we recommend your author ­
i zed Audi dealer change the battery for
you. Batteries contain sulfur ic acid and ..,.
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256 Fuses and bulbs
Interior fuse assignment
No. Equipment Ampere
F14
Climate control system
30 blower
F15
Electronic steering column
10 lock
F16 MMI area 7.5
F17
Instrument cluster 5
F18
Rearv iew camera 7 .5
F19
Convince key system control
7.5 module, tank system
F23 Right exter ior lights 40
F24
Panorama sunroof 20/30
F25
Door/driver's side doors (for
30 example power windows)
F26 Seat heating 30
F27
Sound-amp lifier 30
F29
Interior lights 7.5
Fig. 176 Vehicle inte ri or : fuse assignment F31 Left exter ior lights 40
No . Equipment Ampere F32 Driver assista nce systems 7.5
F2
Seat adjustment 10 F33 Airbag 5
F4
MM controls, MMI compo-
7.5 nents
F5 Gateway 5
Button lighting, coils for
socket relays, interior sound,
F34 back-up light switch, tern-7.5
perature sensor, o il level
F6 Ant i-theft alarm system 5 sensor
Climate/heating control, se-
Diagnosis, headlight range
le ctor lever (automatic
F7 transmission), parking heat -10 F35
control system, air quality
10 sensor,
automat ic dimming
er, rear window heater relay
rearview mirror
coil
Diagnosis, electrical parking
F36
Right cornering light/ right
15 LED-headlight
F8
brake switch, light switch,
10 rain/light sensor, interior
lighting
F9
Steering column switch
1 module
F37
Left corner ing light/ left
15 LED-headlight
Door/front passenger's side
F39 doors (for example, power 30
windows)
Fl0 D isp lay 5
F40 Sockets 20
Fll
Reversible driver's safety
25 belt tensioners F41 Reversible front passenger 's
25 side safety belt tensioners
Fl2 MMI area 15/20
F42 Central locking buttons 40
Fl3
Adaptive dampers control
20 module
F43 Windsh ield washer system 30
F44
all wheel drive 15
F45
Power driver's side seat 15

No. Equ ipment Ampere
F49 Starter, clutch sensor
5
FS3 Rear window defogger 30
The power seats* are protected v ia
circ uit
br ea ker s
that automatically sw itch on after a
few seconds after the overload has been re­
d uced.
(D Tips
Note that the following table was accurate
at the time of pr int ing and is subject to
change.
Left engine compartment fuse
assignment
F ig. 177 Eng ine compartment: fuse assignment
M ,.._
-0
!
No. Equ ipment Ampere
Fl ESC control module 40
F2 ESC control module
40
F3 Eng
ine control module (gas-
15/30
oline)
Engine cooling, engine com-
F 4 ponents, auxiliary heater
5/10
coil relay (1 +2), secondary
a ir injection pump relay
FS Eng
ine components, tank
7,5/10/
system 15
Fuse s and bulb s 257
No. Equipment Ampere
F6 Brake light sensor
5
F7 Engine components, water 7,5/10/
pumps
15
F8 Lambda sensor 10/15
Engine components, ex-
F9 haust door, glow time con-
5/10/20
tro l module, SU LEV valve
FlO Fuel
injectors, fuel control
15/20
module
Fl l Auxiliary heater heating ele
-
40
ment 2
F12 Auxilia
ry heater heat ing ele-
40
ment 3
F13 Automatic transmiss
ion con-
15/30
trol module
FIS Horn 15
F16 Ignit ion coil 20/7.5
F17 ESC contro
l modu le, engine
7.5
control module
F18 T
ermina l 30 (reference volt-
5
age)
F19 Windshield wipers
30
F20 Horn 10
F22 Termina
l SO diagnosis
5
F23 Starter 30
F24 Auxiliary heater heating ele-
ment 1 40
F31 Vacuum pump 15
F32 L ED head lights
5
(i} Tips
Note that the follow ing tab le was accurate
at the time of printing and is subject to
change.

Emergency situations
General
This chapter is intended for trained emer­
gency crews and working personnel who have the necessary tools and equipment to
perform these operations.
Starting by pushing or
towing
(D Note
Vehicles with an automatic transmission
cannot be started by pushing or towing.
Starting with jumper
cables
If necessary, the engine can be started by
connecting it to the battery of another vehi­
cle.
If the engine should fail to start because of a
discharged or weak battery, the battery can be
connected to the battery of
another vehicle,
using a
pair of jumper cables to start the en­
gine.
Jumper cables
Use only jumper cables of sufficiently large
cross section to carry the starter current safe­
ly. Refer to the manufacturer's specifications.
Use only jumper cables with
insulated termi­
nal clamps which are distinctly marked :
plus(+) cable in most cases colored red
minus(-) cable
in most cases colored black.
A WARNING
Batteries contain electricity, acid, and gas.
Any of these can cause very serious or fatal
injury. Follow the instructions below for
safe handling of your vehicle's battery.
- Always shield your eyes and avoid lean­
ing over the battery whenever possible.
- A discharged battery can freeze at tem­
peratures just below 32 °F (0 °C). Before
Emergency situations 259
connecting a jumper cable, you must
thaw the frozen battery completely, oth­
erwise it could explode.
- Do not allow battery acid to contact eyes
or skin. Flush any contacted area with
water immediately .
- Improper use of a booster battery to start a vehicle may cause an explosion.
- Vehicle batteries generate explosive gas­
es. Keep sparks, flame and lighted ciga­
rettes away from batteries.
- Do not try to jump start any vehicle with a low acid level in the battery.
- The voltage of the booster battery must
also have a 12-volt rating. The capacity
(Ah) of the booster battery should not be
lower than that of the discharged bat­
tery . Use of batteries of different voltage
or substantially different "Ah" rating
may cause an explosion and personal in­
JU ry.
- Never charge a frozen battery. Gas trap­
ped in the ice may cause an explosion.
-Never charge or use a battery that has
been frozen. The battery case may have
be weakened.
- Use of batteries of different voltage or
substantially different capacity (Ah) rat­
ing may cause an explosion and injury.
The capacity (Ah) of the booster battery
should not be lower than that of the dis­
charged battery.
- Before you check anything in the engine
compartment, always read and heed all
WARNINGS
¢ page 210.
(D Note
-Applying a higher voltage booster bat­
tery will cause expensive damage to sen­
sitive electronic components, such as
control units, relays, radio, etc.
- There must be no electrical contact be­
tween the vehicles as otherwise current
could already start to flow as soon as the
positive(+) terminals are connected. ..,. •
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