differential AUDI A4 2008 B8 / 4.G Owners Manual

Instruments and warning/indicator lamps19
Controls
Safety
Driving tips
General maintenance
Self-help
Technical data
Applies to vehicles: with cruise control systemCruise control

The indicator lamp
 in the instrument cluster lights up when the
cruise control system is operating.
Anti-lock brake system (ABS)

The warning lamp monitors the ABS and the electronic
differential lock (EDL).The warning lamp
 lights up for a few seconds when the ignition
is switched on and while the engine is being started. The lamp goes
out again once the system has run through an automatic test
sequence.
There is a fault in the ABS if:
•
the warning lamp
 does not light up when the ignition is
switched on,
•
the warning lamp does not go out again after a few seconds,
•
the warning lamp lights up when the vehicle is moving.
The vehicle can still be braked in the normal way (except that the
ABS control function is out of action). Please take the vehicle to a
qualified workshop as soon as possible. For further information on
the ABS ⇒page 222.
If a fault occurs in the ABS, the ESP warning lamp will also light up.
Fault in the main brake system
If the ABS warning lamp
 lights up together with the brake
warning lamp
 ⇒page 32, this indicates a fault in the ABS func-
tion, and possibly a malfunction in the main brake system as well
⇒.
If there is a malfunction in the brake system the symbol
 will light
up in the instrument cluster. Please refer to ⇒page 32.Fault on the electronic differential lock (EDL)
The EDL works in conjunction with the ABS. If a malfunction should
occur in the EDL, this is indicated by the ABS warning lamp
.
Please take the vehicle to a qualified workshop as soon as possible.
For further information on the EDL ⇒page 222.
WARNING
•
Before opening the bonnet and checking the brake fluid level,
observe the warning information on ⇒page 255, “Working on
components in the engine compartment”.
•
If the brake warning lamp
 should light up together with the
ABS warning lamp
, stop the vehicle immediately and check the
brake fluid level in the reservoir. If the fluid level has dropped
below the "MIN" mark you must not drive on - otherwise there may
be an increased accident risk. You should obtain professional
assistance.
•
If the brake fluid level is OK, the fault in the brake system may
have been caused by a failure of the ABS control function. As a
result the rear wheels can lock relatively easily when braking. This
could cause the tail of the vehicle to skid sideways. Drive carefully
to the nearest qualified workshop and have the fault rectified.
Applies to vehicles: with Audi hold assistAudi hold assist

This warning lamp monitors the Audi hold assist function.Audi hold assist helps the driver to keep the vehicle stationary while
the engine is running, for instance on steep gradients, at traffic
lights or in stop-and-go traffic. When the Audi hold assist function
is on, you don't have to keep your foot on the brake to prevent the
vehicle from accidentally rolling away. Once it detects that the
vehicle is stopped, Audi hold assist keeps the vehicle stationary. The
green symbol
 in the instrument cluster indicates that the func-
tion is activated. You can now take your foot off the brake pedal.
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Audi side assist151
Controls
Safety
Driving tips
General maintenance
Self-help
Technical data
Applies to vehicles: with side assistArea covered by the radar sensorsThe area covered by the radar sensors ⇒fig. 166 consists of:•
The rearward approach zone (light green area: up to about 50
metres) and
•
Blind spots (dark green area) .
The radar sensors monitor the lanes immediately to the left and
right of your vehicle. Other lanes are not covered by the sensors.Note
The side assist system is programmed for lanes of a fixed width, and
is not able to measure differing lane widths. It monitors a zone
equivalent to one normal lane width on either side. If the lanes are
narrower than this, or if vehicles are not travelling in the centre of
the lanes, the system may register vehicles that are not in fact trav-
elling in an adjacent lane ⇒page 156.Applies to vehicles: with side assistHow the system worksWhen other vehicles are detected, the side assist system registers
their distance and how fast they are approaching. The warning lamp on the relevant exterior mirror will light up whenever the side assist
calculates that the distance and the speed differential of
approaching vehicles would be critical in the event of a lane change.
The warning lamp may light up when you are being overtaken and
when you are overtaking another vehicle.
If you are overtaking slowly, with a speed differential of less than
15 km/h, the warning lamp will light up as soon as the other vehicle
enters your blind spot and is detected by the sensors. If you are
overtaking with a speed differential which is greater than this the
lamp will not give a warning.
Applies to vehicles: with side assistInformation mode and warning modeThe side assist has two modes of operation•
The information mode and
•
The warning mode
The side assist will respond in the appropriate mode, depending on
whether or not you operate the turn signal to indicate an intended
lane change.
Information mode
As long as you do not operate the turn signal, the side assist will
merely inform you of the presence of vehicles that it has detected
and judges to be critical in the event of a lane change. The warning
lamp on the relevant exterior mirror will light up with low intensity
whenever the side assist calculates that the distance and the speed
differential of an approaching vehicle are critical.
The intensity of the warning lamp in this information mode is delib-
erately kept relatively low, so that it does not distract you while you
are looking at the road in front and do not intend to change to a
different lane. The information mode is clearly visible when you look
in the exterior mirror.
Fig. 166 Schematic
diagram: Area covered
by the radar sensors
A1
A2
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Audi side assist153
Controls
Safety
Driving tips
General maintenance
Self-help
Technical data
Applies to vehicles: with side assistSituation with vehicle approaching slowly from behindFig. 168 side assist: Vehicles approaching slowly from behind and vehicles in
the blind spot Warning lamp on exterior mirror does not light up
The sensors have detected a slowly approaching vehicle - in this
example in the left-hand lane. Because it is relatively far away and
only approaching slowly, no warning will appear on the exterior
mirror ⇒ in “Safety notes” on page 157.
Warning lamp lights up in information mode
The slowly approaching vehicle is now closer. The warning lamp on
the exterior mirror lights up in the information mode.
The warning lamp on the exterior mirror will only light up if the side
assist calculates that the distance and the speed differential of
approaching vehicles would be critical in the event of a lane change. In all cases, the side assist will light up to indicate the vehicles it has
detected at the latest when they enter the “blind spot”.
Warning lamp flashes in warning mode
If you operate the turn signal in situation , the warning lamp on
the exterior mirror will flash briefly several times. This calls your
attention to the presence of a vehicle which you may have over-
looked.
Note
•
The faster a vehicle approaches, the earlier the warning will
appear on the exterior mirror. The side assist will give a warning for
the approaching vehicles it has detected at the latest when they
enter the “blind spot”.
•
If a vehicle is approaching at high speed it is possible that a lane
change may be critical, even though no warning is given.
A1A2
A3
A2
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Audi side assist 154Applies to vehicles: with side assistSituation when you are slowly overtaking other vehiclesFig. 169 side assist: Other vehicles being overtaken slowly Warning lamp on exterior mirror does not light up
The vehicle you are overtaking has not yet been detected by the side
assist. The warning lamp on the exterior mirror does not light up
⇒ in “Safety notes” on page 157.
Warning lamp lights up in information mode
The vehicle you are passing slowly (with a speed differential less
than 15 km/h) is detected by the side assist. The warning lamp on
the exterior mirror lights up in the information mode.
Warning lamp flashes in warning mode
If you operate the turn signal in situation , the warning lamp on
the exterior mirror will flash briefly several times. This calls your attention to the presence of a vehicle which you may have
overlooked.
Applies to vehicles: with side assistSituation when you are rapidly overtaking other vehiclesFig. 170 side assist: Other vehicles being overtaken rapidly Warning lamp on exterior mirror does not light up
The vehicle you are overtaking has not yet been detected by the side
assist. The warning lamp on the exterior mirror does not light up
⇒ in “Safety notes” on page 157.
Warning lamp on exterior mirror does not light up
The vehicle you are passing rapidly (with a speed differential greater
than 15 km/h) is detected by the side assist but is not judged to be
critical in the event of a lane change since it is dropping back
A1A2A3
A2
A1A2
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Intelligent technology 222Intelligent technologyElectronic stabilisation program (ESP)DescriptionESP increases the car's stability. It reduces the tendency to skid and
improves the stability and roadholding of the vehicle. ESP detects
critical handling situations, such as understeer, oversteer and
wheelspin on the driven wheels. It stabilises the vehicle by braking
individual wheels or by reducing the engine torque. The warning
lamp
 in the instrument cluster starts flashing as soon as the ESP
intervenes.
The ESP incorporates the functions of the anti-lock brake system
(ABS), the traction control system (ASR), the electronic differential
lock (EDL) and the dynamic steering*.
Anti-lock brake system (ABS)
ABS prevents the wheels from locking up under braking until the
vehicle has reached a virtual standstill. You can continue to steer the
vehicle even when the brakes are on full. Keep your foot on the brake
pedal and do not pump the brakes. You will feel the brake pedal
pulsate while the anti-lock brake system is working.
Brake assist system
The brake assist system can speed up the braking process and
shorten the braking distance. It automatically boosts the braking
force if you press the brake pedal quickly in an emergency. On vehi-
cles with adaptive cruise control*, the brake assist system will build
up a small amount of pressure in the hydraulic brake system if it
senses that you are too close to the vehicle in front.
Traction control system (ASR)
In the event of wheelspin, the traction control system reduces the
engine torque to match the amount of grip available. This helps the
car to start moving, accelerate or climb a gradient.Electronic differential lock (EDL)
When the EDL detects wheelspin, it brakes the spinning wheel and
directs the power to the other driven wheel (or wheels on quattro*
versions). This function is active up to about 100 km/h.
To prevent the disc brake of the braked wheel from overheating, the
EDL cuts out automatically if subjected to excessive loads. The
vehicle can still be driven. The EDL will switch on again automati-
cally when the brake has cooled down.
Dynamic steering*
On vehicles with dynamic steering*, the ESP can also intervene in
the steering to stabilise the vehicle in critical situations.
WARNING
•
The grip provided by the ESP, ABS, ASR, EDL and dynamic
steering* systems is still subject to the physical limits of adhesion.
Always bear this in mind, especially on wet or slippery roads. If
you notice the systems cutting in, you should reduce your speed
immediately to suit the road and traffic conditions. Do not let the
extra safety provided tempt you into taking any risks when driving
– this can cause accidents.
•
Please remember that the accident risk always increases if you
drive fast, especially in corners or on a slippery road, or if you
follow too close behind the vehicle in front of you. Please bear in
mind that even ESP, ABS, brake assist, EDL, ASR and dynamic
steering* cannot compensate for the increased accident risk.
•
When accelerating on a uniformly slippery surface (for instance
all four wheels on ice or snow), press the accelerator gradually and
carefully. The driven wheels may otherwise start to spin (in spite
of the integrated control systems), which would impair the car's
stability and could lead to an accident.
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Index333
Controls
Safety
Driving tips
General maintenance
Self-help
Technical data Supplementary heater . . . . . . . . . . . . 101
Switching on and off . . . . . . . . . . . . . . . 95
Temperature . . . . . . . . . . . . . . . . . . . . . . 96
Deluxe automatic air conditioner plus . . 101
AC mode . . . . . . . . . . . . . . . . . . . . . . . . 107
Air distribution . . . . . . . . . . . . . . . . . . . 106
Air outlets . . . . . . . . . . . . . . . . . . . . . . . 107
Air outlets for rear passengers . . . . . 108
Air recirculation mode . . . . . . . . . . . . 105
Automatic mode . . . . . . . . . . . . . . . . . 103
Automatic recirculation . . . . . . . . . . . 109
Auxiliary heating . . . . . . . . . . . . . . . . . 110
Auxiliary heating - remote control . . . 113
Auxiliary heating - running time . . . . 112
Basic settings . . . . . . . . . . . . . . . . . . . . 109
Blower . . . . . . . . . . . . . . . . . . . . . . . . . . 104
Controls . . . . . . . . . . . . . . . . . . . . . . . . 102
Defrosting . . . . . . . . . . . . . . . . . . . . . . . 106
Description . . . . . . . . . . . . . . . . . . . . . . 101
Economical operation . . . . . . . . . . . . . 108
Heated rear window . . . . . . . . . . . . . . 106
Supplementary heater . . . . . . . . . . . . 110
Switching on and off . . . . . . . . . . . . . . 103
Synchronisation . . . . . . . . . . . . . . . . . . 109
Temperature . . . . . . . . . . . . . . . . . . . . . 104
Diesel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 251
Diesel particulate filter . . . . . . . . . . . . 38, 229
Engine oil . . . . . . . . . . . . . . . . . . . . . . . 257
Digital clock . . . . . . . . . . . . . . . . . . . . . . . . . 13
Digital compass . . . . . . . . . . . . . . . . . . . . . . 71
Digital speedometer . . . . . . . . . . . . . . . . . . 23
Dimensions . . . . . . . . . . . . . . . . . . . . . . . . 320Dipped headlights . . . . . . . . . . . . . . . . . . . . 57
Defective . . . . . . . . . . . . . . . . . . . . . . . . . 37
DIS
SeeDriver information system . . . . . . . 21
Distance control system
Seeadaptive cruise control . . . . . . . . 128
Door catches/boot lid warning . . . . . . . . . 24
Doors
Child-proof catches . . . . . . . . . . . . . . . . 53
Manual locking . . . . . . . . . . . . . . . . . . . . 51
Driver
SeeSitting position . . . . . . . . . . . . . . . 188
Driver information system . . . . . . . . . . . . . 21
Auto-check control . . . . . . . . . . . . . . . . 30
Bulb monitor . . . . . . . . . . . . . . . . . . . . . 37
CD and radio display . . . . . . . . . . . . . . . 22
Digital speedometer . . . . . . . . . . . . . . . 23
Door catches/boot lid warning . . . . . . . 24
Driver messages . . . . . . . . . . . . . . . . . . 30
On-board computer . . . . . . . . . . . . . . . . 25
Outside temperature display . . . . . . . . 22
Red symbols . . . . . . . . . . . . . . . . . . . . . . 31
Service interval display . . . . . . . . . . . . . 24
Speed warning . . . . . . . . . . . . . . . . . . . . 28
Yellow symbols . . . . . . . . . . . . . . . . . . . 35
Driver messages . . . . . . . . . . . . . . . . . . . . . 30
Driving
Run flat tyres . . . . . . . . . . . . . . . . . . . . 275
Driving abroad
Headlights . . . . . . . . . . . . . . . . . . . . . . . 59
Unleaded fuel . . . . . . . . . . . . . . . . . . . . 251
Driving away from a standstill . . . . . . . . . 122
Driving away when towing a trailer . . . . 123Driving on left . . . . . . . . . . . . . . . . . . . . . . . 59
Driving on right . . . . . . . . . . . . . . . . . . . . . . 59
Driving safety . . . . . . . . . . . . . . . . . . . . . . . 187
Driving time . . . . . . . . . . . . . . . . . . . . . . . . . 25
Dust filter
Deluxe automatic air conditioner . . . . . 93
Deluxe automatic air conditioner plus . .
101
DVD player . . . . . . . . . . . . . . . . . . . . . . . . . . 80
Dynamic gear control program . . . . . . . . 166
Dynamic steering . . . . . . . . . 16, 36, 159, 222
EEconomical driving . . . . . . . . . . . . . . . . . . 229
EDL
SeeElectronic differential lock . . . . . . . 19
Electric seat adjustment
SeeSeat adjustment . . . . . . . . . . . . . . . 74
Electric windows . . . . . . . . . . . . . . . . . . . . . 53
Central locking system . . . . . . . . . . . . . 54
Convenience open/close function . . . . 54
Malfunctions . . . . . . . . . . . . . . . . . . . . . . 55
Settings . . . . . . . . . . . . . . . . . . . . . . . . . . 55
Electrical accessories
SeeElectrical socket . . . . . . . . . . . . . . . 88
Electrical socket . . . . . . . . . . . . . . . . . . . 87, 88
Electro-mechanical parking brake . . . . . . 124
Auto release function . . . . . . . . . . . . . 122
Driving away from a standstill . . . . . . 122
Driving away when towing a trailer . . 123
Emergency braking function . . . . . . . 123
Malfunction . . . . . . . . . . . . . . . . . . . . . 123
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Index 334
Operation . . . . . . . . . . . . . . . . . . . . . . . 121
Parking . . . . . . . . . . . . . . . . . . . . . . . . . 122
Releasing and applying . . . . . . . . . . . 121
Warning lamp . . . . . . . . . . . . . . . . . 19, 20
Electronic differential lock
How the system works . . . . . . . . . . . . 222
Warning lamp . . . . . . . . . . . . . . . . . . . . 19
Electronic immobiliser . . . . . . . . . . . . . 14, 43
Electronic stabilisation program
How the system works . . . . . . . . . . . . 222
Warning lamp . . . . . . . . . . . . . . . . . . . . 17
Emergency braking function . . . . . . . . . . 123
Emergency key . . . . . . . . . . . . . . . . . . . . . . 45
Emergency release
Ignition key . . . . . . . . . . . . . . . . . . . . . . 46
Emission control systems
Catalytic converter . . . . . . . . . . . . . . . 229
Diesel particulate filter . . . . . . . . . . . . 229
Emissions . . . . . . . . . . . . . . . . . . . . . . . . . 321
Engine compartment
Safety notes . . . . . . . . . . . . . . . . . . . . . 255
Engine compartment layout . . . . . . . . . . 256
Engine data
SeePerformance, weights and
dimensions . . . . . . . . . . . . . . . . . . . . 323
Engine hood
SeeBonnet . . . . . . . . . . . . . . . . . . . . . . 254
Engine management
(EPC) warning lamp . . . . . . . . . . . . . . . 16
Engine oil . . . . . . . . . . . . . . . . . . . . . . 34, 257
Checking oil level . . . . . . . . . . . . 258, 259
Consumption . . . . . . . . . . . . . . . . 258, 259
LongLife Service . . . . . . . . . . . . . . . . . 257Topping up . . . . . . . . . . . . . . . . . . . . . . 259
See alsoPerformance, weights and
dimensions . . . . . . . . . . . . . . . . . . . . 323
Engine oil capacity
SeePerformance, weights and
dimensions . . . . . . . . . . . . . . . . . . . . 323
Engine oil pressure
Warning lamp . . . . . . . . . . . . . . . . . . . . 33
Engine oil sensor
Malfunction . . . . . . . . . . . . . . . . . . . . . . 38
Environmental compatibility . . . . . . . . . . 231
Environmental tips
Filling the tank . . . . . . . . . . . . . . . . . . . 252
Heated rear window . . . . . . . . . . . 98, 106
Leaks . . . . . . . . . . . . . . . . . . . . . . . . . . . 255
Roof carrier . . . . . . . . . . . . . . . . . . . . . . 84
EPC
SeeEngine management . . . . . . . . . . . 16
ESP
SeeElectronic stabilisation program . 17
Ethanol fuel . . . . . . . . . . . . . . . . . . . . . . . . 251
Exterior mirrors . . . . . . . . . . . . . . . . . . . . . . 70
FFastening rings . . . . . . . . . . . . . . . . . . 79, 193
Filling the tank . . . . . . . . . . . . . . . . . . . . . 252
Releasing the tank flap manually . . . 253
Fire extinguisher . . . . . . . . . . . . . . . . . . . . 283
First-aid kit . . . . . . . . . . . . . . . . . . . . . . . . . 282
Floor mats . . . . . . . . . . . . . . . . . . . . . 191, 192
Fog lights . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
Four-wheel drive . . . . . . . . . . . . . . . . . . . . 226Front passenger
SeeSitting position . . . . . . . . . . . . . . . 189
Fuel
Biodiesel . . . . . . . . . . . . . . . . . . . . . . . . 251
Capacity . . . . . . . . . . . . . . . . . . . . . . . . 321
Consumption . . . . . . . . . . . . . . . . . . . . 321
Current fuel consumption . . . . . . . . . . 25
Diesel . . . . . . . . . . . . . . . . . . . . . . . . . . 251
Ethanol . . . . . . . . . . . . . . . . . . . . . . . . . 251
Fuel level low . . . . . . . . . . . . . . . . . . . . . 37
Petrol . . . . . . . . . . . . . . . . . . . . . . . . . . 251
Saving fuel . . . . . . . . . . . . . . . . . . . . . . 229
Fuel consumption . . . . . . . . . . . . . . . . . . . 321
Fuel range . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Fuel tank flap . . . . . . . . . . . . . . . . . . . . . . . 252
Fuse, changing . . . . . . . . . . . . . . . . . . . . . 300
GGarage door opener . . . . . . . . . . . . . . . . . 179
Gear-change indicator . . . . . . . . . . . . . . . . 22
Generator
SeeAlternator . . . . . . . . . . . . . . . . . . . . 32
Glove box . . . . . . . . . . . . . . . . . . . . . . . . . . . 90
Glow plug system
Indicator lamp . . . . . . . . . . . . . . . . . . . . 16HHandbrake
SeeElectro-mechanical parking brake . . .
121
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