2015 AUDI Q3 relay

166 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 trai ler, p lease remember
that the additional load will affect durability,
economy and performance .
Trailer towing not on ly places more stress on
the vehicle, it also calls for more concentra­
tion from the driver.
For this reason, always fo llow the operating
and driving instructions provided and use
common sense.
Technical requirements
Tr aile r hitch
Use a weight-carrying hitch conforming to the
gross trailer weight. The hitch must be suita­
ble for your vehicle and trailer and mu st be
mounted securely on the veh icle's chassis at a
technically sound location. Use only a trailer
h itch with a removab le ball mount. A lways
check with the trai ler h itch manufact urer to
make sure that you are using the correct
hitch.
Do not use a bumper hi tch .
The hitch must be installed in such a way that
it does not interfere with the impact-absorb­
ing bumper system . No modifications should
be made to the vehicle exhaust and brake sys­
tems . From t ime to time, check that all hitch
mounting bo lts remain securely fastened.
When you are not towing a trailer, remove the
trailer h itch ball mount. This prevents the
h itch from causing damage should your veh i­
cle be struck from behind
¢ A .
Traile r brak es
If your tra iler is equipped w ith a braking sys­
tem, check to be sure that it conforms to a ll
regulat ions . The trailer hydraulic brake system must not be
direct ly connected to the vehicle's hydraulic
brake system
~ A .
Saf ety ch ain s
Always use safety chains between your veh icle
and the trai le r.
Trail er light s
Trailer lights must meet all regulations. Be
sure to check w ith your authorized Audi dealer
for correct wi ring, switches, and relays.
Mirrors
If you are unable to see the traffic behind you
us ing the regular outside mirrors, then you
must install extended mirrors .
It is important
that you always have clea r vis io n to the rear.
,8. WARNING
- I f a trai ler has electrical brakes p lease
note that these brakes are not activated
by the factory -fitted control unit -risk of
accident!
- Afte r removing the trailer hitch, do not
store it in your vehicle. In case of sudden
braking, the hitch could fly forward and
injure you or your passengers.
- Never install a "weight distributing" or
"load equalizing" trailer hitch on your ve­
h icle. The vehicle was not designed for
these kinds of trailer h itches. The h itch
attachment can fail, caus ing the trailer
to tear loose from the veh icle.
- The Gross Vehicle Weight Rating for your
veh icle, found on the safety compliance
label on the driver's s ide B-pillar, must
never be exceeded under any c ircumstan­
ces. Exceeding the Gross Vehicle Weight
Rating of yo ur vehicle is likely to damage
your vehicle, and such damage will not
be covered by yo ur Limited New Ve hicle
Warranty . Exceeding the Gross Vehicle
Weight Rating will a lso change the per­
formance and handling characteristics of
your veh icle, wh ich could cause a crash
resulting in serious injury or death.
-

M N
M N
0 ::i co ,...., \!) 1.1'1 ,...., 1.1'1 ,....,
-To r educe the danger of explosion, never
connect or disconnect charger cables
while the charger is operating.
- Fast charg ing a battery is dangerous and
should only be attempted by a compe­
tent technician w ith the proper equip­
ment .
- Battery acid that may spill during charg­
ing should be washed
off with a solution
of warm water and baking soda to neu ­
t ralize the acid .
Never use a fast charger as a booster to
start the engine . This will seriously dam­
age sensitive elect ronic components, such
as control units, relays, radio, etc. , as we ll
as t he battery charger.
Battery replacement
The new battery must have the same specifi­
cations and dimensions as the original equip­
ment battery.
Intell igent energy management in your veh i­
cle is respons ible for d istr ibuting the e lectr i­
cal energy throughout you r vehicle
¢ page 159. The inte lligen t en ergy ma nage­
men t system w ill keep the engine b attery
charged be tter then vehicles w ithout this sys­
tem . To make sure t he additional e lectrica l e n­
ergy is available once again after you have
changed t he battery, we recommend that you
install ba tteries of the same type and man u­
facture only (the same as t hose installed at
the t ime your vehicle was delivered) . Specifi­
cations a re listed on the battery hous ing . You r
author ized Audi dealer must code the bat tery
in the energy management system to enable
you to use the energy management functions
correctly after rep lac ing the battery .
I f it is not poss ible to use a battery of this
type, the new bat tery mus t have the s ame ca­
pacity, vo ltage ( 12-volts), ampe rage, con­
struction and pl ug sea ling.
Checkin g and fillin g 193
When installing the battery, make su re the ig ­
nition and a ll electrical consume rs a re turned
off.
Q) Note
M ake sure the ven tilat ion hose on the side
of the batte ry is connecte d, otherwise
fumes o r batte ry acid can leak out .
@ For the sake of the environment
Because o f the p rob lem of proper disposal
of a battery, we recommen d your author­
i zed A udi dealer change the battery for
you. Batteries contain sulfur ic acid and
l ead and must always be disposed of prop­
erly in comp liance with a ll environmental
r egula tions . Dispos ing of vehicle batter ies
i mprope rly is v ery dange rous to th e envi­
r o nmen t.
Windshield washer
container
Fi g. 151 En gin e co mpa rtm en t: Cove r o n th e wind­
s hi eld was her fluid conta in e r
The washer fluid conta iner is mar ked w ith the
symbol
O on its cap ¢ fig . 151, ¢page 181,
fig . 145.
.. Before yo u check any thing in t he engine
compa rtment,
alwa ys re ad and heed all
WARNINGS ¢ & in Working in the engine
compartment on page 179 .
.. Lift the fi ller cap tongue to add washer flu ­
id. You can f ill the container to t he top.
.. Press the cap back o nto the fi lle r neck after
filling the co nta iner .
You can find the reservo ir
capacity in the table
in
¢ page 235. 111>
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0 ::i co ,...., \!) 1.1'1 ,...., 1.1'1 ,....,
No.
13
14
15
16
17
18
19
20
23
26
27
28
Consumer
A ir quality/outside air sen-
sor, heated washer jets,
Electronic Stabilization Con-
trol (button), reversing
light, electromechanical
parking brake, o il level sen-
sor, climate control, seat oc-
cup ied recognit ion system,
seat heating, contro ls in
center console, automatic
dimming mirrors
Eng ine control u nit, auto-
matic transmiss ion, bra ke
l ights, electro-mechanical
power steer ing, gateway
control un it, towing bracket
control unit, ESC contro l
unit, light switch, damping
control un it
H eadlight leveling, park ing
brake contro l unit, inst ru-
men t lighting, headlights,
diagnostic connector, adap-
tive light control unit, heat-
er for crankcase, air mass
meter, relay for electr ical
sockets, DC/DC converter
Parking aid
Reversing camera for park-
i ng a id
TV tuner
Eng ine starter cont ro l unit,
DC/DC converter
ESC control unit, air condi-
tioner controls, interface for
spec ial functions
e lectromechanical parking
b rake switch, switches for
interior lighting (front), di-
agnostic connector, light
switch, rain and light sensor,
humidity sensor
Rear window wiper
Starter control un it
Radio/MM I
Amps
5
7,5 10 5
5
5 5
s
10
15
40
15/7,5
Fu ses and bulb s 225
No. Consumer Amps
29
Supply for reversing camera
15 for park ing aid and TV tuner
30 Infot ainment 5
31
Infotainment 5
32
Instr ument cluster 5
33
Automatic dimming rear-
view m irror
10
E lectrica l socket in front
36 cabin, electrical socket in 20
luggage compartment
37 Electr ica l soc ket i n rear cab-
20 in, ciga rette lighter
38 Automatic transmission 15
44
Rear window hea ting 30
45
Parking brake control unit 20
48
Power-operated rear lid 30
so B lower 40
51
Parking brake control unit 20
52
On board supply control unit 20
53
Seat heating, front 30
54
Panoram ic sun roof 20
55
Sun b lind for panorama sun 20
roof
56
Contro l unit fo r suspension
20 cont rol
Engine compartment fuse assignment
The fuse number is given on the plastic be­
neath or above the correspond ing fuse.
No. Electrical equipment
amps
1 Power supply for automatic 5 transmission
2
E lectronic Stabilizat ion Con-
30 t ro l (E SC)
3 Horn 15
4
DC/DC converter 40
5
Onboard supply control unit 5
6
BCM (righ t-side) 30
7
Washer pump 20
8
BCM ( left -side) 30
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226 Fuses and bulbs
No. Electrical equipment amps
9 Lumbar support seat adjust-
ment
10
10 Lambda probe 10
Steering column lever, mul-
11 ti-function steering wheel
s
controls
12 Mobile phone adapter
s
13 Engine control unit 10
14 Engine control
unit
25
15 Gateway 5
16 Lambda
probe, fuel pump,
10
engine components
17 Eng ine components 20
18 Fuel pump control unit
2S
19 Sound
amplifier, DC/DC con-
verter 30
20 Brake light sensor
s
22 Windshield
wipers
30
Water recirculation pump,
23
supplementary heater, rad i-
10 a tor fans, relay coils for fuel
pump , engine components
24 Ignition coils 20
2S Central locking
, e lectr ic win-
30
dow (driver's side)
26 Central locking, e
lectr ic win-
30
dow (front passenger's side)
27 Power supply, terminal 15
so
29 Electric seat adjustment 30
30 Electronic Stabilization Con-
40
trol (ESC)
Bulbs
Replacing bulbs
For your safety, we recommend that you have
your authorized Audi dealer replace any bulbs for you.
It is becoming increas ingly more and more
difficult to replace vehicle lig ht bulbs s ince in
many cases, other parts of the car must first
be removed before you are able to get to the bulb.
This applies especially to the light bulbs
in the front of your car which you can only
reach through the engine compartment.
Sheet meta l and bulb holders can have sharp
edges that can cause serious cuts, parts must
be correct ly taken apart and then properly put
back together to he lp prevent breakage of
parts and long term damage from water that
can enter housings that have not been proper­
ly resealed.
For your safety, we recommend that you have
your authori zed Audi dea ler replace any bulbs
for you, since your dealer has the proper tools,
the correct bulbs and the expertise.
Gas discharge lamps (Xenon lights ):
Due to the high e lectr ica l voltage, have the
bulbs replaced by a qualified technician.
Headlights with Xenon light are identified by
the high voltage st icker.
A WARNING "--
Changing Xenon lamps without the neces-
sary equipment can cause serious persona l
injury.
- Bulbs are pressurized and can explode
when being changed. Potential risk of in­
jury!
- On veh icles equipped with gas discharge
bulbs (Xenon light) life-threatening inju­
ries can result from improper handling of
the high-voltage portions of such lamps!
- Only your authorized Audi dealer or qualified workshop should change the
bu lbs in gas discharge lamps. There are
pa rts with sharp edges on the openings
and on the bulb holders that can cause
serious cuts. If you are uncertain about
what to do, have the work performed by
an authorized Audi dealer or qualified
workshop. Serious personal injury may
result from improperly performed work.
@ Tips
-If you still prefer to replace the light
bulbs yourself, be aware that the engine ..,.

228 Emergency situations
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 ope rations.
Starting by pushing or
towing
Q;) Note
Vehicles with an automati c 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 veh icle,
using a
pair of jumper cables to start the en­
g ine .
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
na l clamps which are distinctly marked:
plus(+) cable in most cases colored red
minu s(-) cable
in most cases colored black .
A WARNING
Batteries contain electricity, ac id, and gas .
Any of these can cause very serious or fatal
inju ry. Follow the instructions below for
safe handling of your veh icle's battery.
- Always shield you r eyes and avoid lean­
ing over the battery whenever possible.
- A discharged battery can freeze at tem­
peratures just be low 32 °F (0 °C). Before connecting a
jumper cable, you must
thaw the frozen battery complete ly, 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 ac id level in the battery.
- The vo ltage 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 d ifferent voltage
or substantially different "Ah" rating
may cause an exp losion and personal in­
jury.
- Never charge a frozen batte ry. 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 batter ies of different voltage or
substantially different capacity (Ah) rat­
ing may cause an exp losion 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 a ll
WARNINGS ¢
page 179.
(D Note
-App lying a higher voltage booster bat­
tery will cause expensive damage to sen­
sitive electronic components, such as
control units, relays, radio, etc .
- Th ere must be no electrical contact be­
tween the vehicles as otherwise current cou ld already start to f low as soon as the
positive(+) terminals are connected. .,.