2008 AUDI A4 sensor

Lights and vision 58
WARNING
The automatic headlights are only intended to assist the driver.
The driver must always ensure that the headlights are used when
required, and may have to switch the m o n m a n u a l l y when the light
conditions or visibility are poor. For example, the light sensors are
not able to detect fog. Therefore, you should always switch on the
headlights
 in these conditions and when driving after dark.
Note
•
The light sensor for automatic headlight control is located in the
mounting for the interior mirror. Do not affix any stickers on this
section of the windscreen to avoid malfunctioning of the sensor.
•
Some of the settings for the exterior lighting can be adjusted
⇒page 59.
•
If the lights are left on after the key has been taken out of the
ignition lock, a buzzer sounds when the driver's door is opened.
•
The use of the lighting described here is subject to the relevant
statutory requirements.
•
The coming home/leaving home function is active only when the
light switch is set to AUTO.
Fog lights
– Press button ⇒fig. 55 to switch on the front fog lights
.
– Press button to switch on the rear fog lights
.
Front fog lights
The side lights or headlights must be switched on. The green diode
at the edge of the switch lights up when the front fog lights are
switched on.
When the headlights are set to AUTO, the dipped headlights are
switched on automatically when you switch on the front fog lights.
Rear fog lights
The headlights or side lights and the front fog lights must be
switched on.
The yellow diode at the edge of the switch lights up when the rear
fog lights are switched on.
If you are towing a trailer or caravan equipped with a rear fog light
on a vehicle with a factory-fitted towing bracket, only the rear fog
light on the trailer or caravan will light up.
Caution
To avoid dazzling the traffic behind you, the rear fog light should
only be used in accordance with statutory regulations.
Fig. 55 Switch for
front fog lights
A1A2
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Lights and vision59
Controls
Safety
Driving tips
General maintenance
Self-help
Technical data
Exterior lighting settings
You can change the settings for these functions on the
sound system or MMI*.Important: .
– Select: Function selector button > Exterior lighting.coming home
The coming home function lights up the area round the vehicle after
dark when the ignition has been switched off and the driver's door
opened. This function can be set to operate for a time interval
between 0 (off) and 60 seconds. The coming home function is oper-
ational when the light switch is set to AUTO.
leaving home
The leaving home function lights up the area round the vehicle after
dark when the vehicle is unlocked. The function can be switched on
or off as required. The leaving home function is operational when
the light switch is set to AUTO.
Automatic headlights*
The sensitivity of the light sensor (i.e. how soon the lights are
switched on) can be adjusted.Daytime running lights*
The daytime running lights are switched on and off together with
the ignition.
On vehicles for some markets the daytime running lights cannot be
switched off if the vehicle has halogen headlights.
Headlamp converter* for driving abroad
The asymmetric low beams of the headlights are designed to light
up the near side of the road more intensely. If you drive a right-hand
drive vehicle in a left-hand drive country, or vice versa, you will
dazzle oncoming traffic.
Vehicles with xenon headlights*: The headlamp converter should be
switched on to avoid dazzling oncoming traffic.
Vehicles with halogen headlights: Opaque stickers should be
applied to certain parts of the headlight lenses. For further informa-
tion, please consult an Audi dealer or other qualified workshop.
Instrument lighting
The background lighting of the instruments, the centre
console and the display can be adjusted as required.– Briefly press the knob to release it.
Fig. 56 Display: Exte-
rior lighting
CAR
Fig. 57 Instrument
lighting
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Lights and vision 60
– Turn the button clockwise +” to increase the brightness
of the instrument lighting in dark conditions.
– Turn the button anti-clockwise -” to reduce the bright-
ness of the instrument lighting in dark conditions.
– Press the knob in again to prevent the setting from being
changed unintentionally.The instrument lighting (dials and needles), the centre console illu-
mination and the illumination of the displays are regulated by a
light sensor incorporated in the instrument cluster. In bright condi-
tions any changes made to the brightness of the instrument lighting
have no effect.
Note
The instrument lighting (illumination of dials and needles) is
switched on when the ignition is on and the vehicle's lights are off.
The instrument lighting is dimmed automatically as the daylight
starts to fade; it is switched off completely when the light condi-
tions become very poor. This function is intended to remind the
driver to switch on the dipped-beam headlights in good time when
light conditions become poor.
Applies to vehicles: with headlight range controlHeadlight range control

When the dipped beam headlights are switched on, the
range of the headlights can be adjusted to suit the load
being carried.– Turn the thumbwheel
 ⇒fig. 58 to the appropriate
setting.
Adjustment settings
The settings correspond roughly to the following load conditions:
Two front occupants, luggage compartment empty
All seats occupied, luggage compartment empty
All seats occupied, luggage compartment loaded
Driver only, luggage compartment loaded
Caution
Always adjust the headlights to avoid dazzling oncoming traffic.
Make sure you lower the headlights when the vehicle is carrying a
heavy load.
Fig. 58 Headlight
range control
AOAIAIIAIII
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Lights and vision65
Controls
Safety
Driving tips
General maintenance
Self-help
Technical data
– To retract the sun blind automatically when reversing,
select: Function selector button > Windows >
Automatic rear blind > on.If you switch the Automatic rear blind function on in the sound
system or MMI*, the raised sun blind will be retracted automatically
when reverse gear is engaged ⇒page 55. In this way, the rear blind
will not obstruct your vision when reversing. The rear blind returns
to its raised position when reverse gear is disengaged and the
vehicle is driven forwards at a speed above about 15 km/h. The
current setting is automatically stored and assigned to the remote
control key.
If the rear blind was rolled in automatically when reversing and then
the ignition was switched off and on again, the blind will not roll
back out again when you select a forward gear and the speed
exceeds 15 km/h. You will then have to press the button
 on the
centre console to extend the blind again.
The sun blind for the rear window switches off automatically when
it reaches the end position. It can be made to move in the other
direction before it reaches its end position by briefly pressing the
switch a second time. If the ignition is turned off while the blind is
still moving, it continues until it reaches the end position before
switching off.
Note
•
An overload cut-out may be activated if the sun blind is operated
repeatedly. There will then be a short delay before the blind can be
operated again.
•
As the material of the sun blind is less flexible at low tempera-
tures the electric actuator is switched off when the temperature in
the car is below -5°C. The blind can only be operated when the
temperature in the car's interior rises above this level.
Windscreen wipersWindscreen wipers

The windscreen wiper lever controls the windscreen
wipers and the automatic wash and wipe.The windscreen wiper lever has the following settings:
Brief wipe
– Move the lever down to position to give the wind-
screen a brief wipe.
Intermittent wipe

(activating rain sensor)
– Move the lever up to the stop .
– Move the control to the left or right to set the sensi-
tivity of the rain sensor.
Slow wiper speed
– Move the lever up to the stop .
Fast wiper speed
– Move the lever up to the stop .
CAR
Fig. 67 Windscreen
wiper lever
A1
A2
AA
A3A4
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Lights and vision 66
Automatic wash and wipe
– Pull the lever to position .
– Release the lever again. The washer will stop and the
wipers will keep running for approximately 4 seconds.
The number of wipe cycles varies according to the length
of time the lever is pulled.
Switching off the wipers
– Move the lever to the "off" position .General notes
The washers and wipers will only work when the ignition is switched
on.
If you stop briefly, e.g. at traffic lights, the wiper speed will automat-
ically be reduced by one level.
The windscreen washer jets are heated when the ignition is
switched on if the outside temperature is low.
Dribble wipe
About 5 seconds after the wash and wipe cycle has finished, the
windscreen wiper system automatically gives the screen one extra
wipe to remove any dribbles of water.
If you want to deactivate the dribble wipe function while driving,
pull the lever to position again within 10 seconds.
The dribble wipe function will be re-activated the next time the igni-
tion is switched off and on.
Rain sensor*
The rain sensor will only function in the intermittent wipe position.
The intermittent wipe function is activated automatically when it
starts to rain.
Before you reach a road speed of 6 km/h you will have to activate the
rain sensor manually by switching it off and back on again.To reduce the sensitivity level of the rain sensor move control
⇒page 65, fig. 67 to the left. To increase the sensitivity level of the
rain sensor move the control to the right.
If you have selected a high sensitivity level for the rain sensor the
windscreen wipers will react sooner to any moisture on the wind-
screen. The wiper intervals in the intermittent wipe setting are also
varied automatically according to the road speed (in addition to the
sensitivity setting).
WARNING
•
Poor visibility can cause accidents. Always ensure that the
wiper blades are in good condition ⇒page 68, “Changing wiper
blades”.
•
The rain sensor is only intended to assist the driver. The driver
is still obliged to manually operate the windscreen wipers as
required depending on visibility.
•
Do not use water-repellent coatings on the windscreen. In bad
visibility conditions such as light rain, low sun or when driving at
night these coatings can cause increased dazzle, which is a
serious safety hazard. Such coatings can also cause the wiper
blades to judder.Caution
•
In icy conditions, always check that the wiper blades are not
frozen to the glass before using the wiper for the first time. If you
switch on the wipers when the wiper blades are frozen to the glass,
this could damage both the wiper blades and the wiper motor.
•
Make sure you switch off the windscreen wiper system (lever in
position "0") before you use an automatic car wash. This will avoid
inadvertent triggering of the wipers and possible damage to the
wiper system.
A5
A0
A5
AA
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Lights and vision67
Controls
Safety
Driving tips
General maintenance
Self-help
Technical data
Note
•
Check that the washer fluid reservoir is full before starting a long
journey. Filling the reservoir ⇒page 267.
•
Worn or dirty wiper blades can cause smearing on the glass
which can also impair the effectiveness of the rain sensor. Please
check the wiper blades regularly.
Applies to vehicles: with headlight washersHeadlight washer systemThe headlight washer system only operates when the lights
are switched on.
– Move the automatic wash and wipe lever to position
⇒page 65, fig. 67.The headlight washer system is always activated the first time you
operate the automatic wash and wipe. Subsequently, it is only acti-
vated about every five wash and wipe cycles. The headlights are
always washed if you hold the lever for longer than about
2seconds.
The headlight washer jets come out of the bumper automatically
(under water pressure).
Clean off stubborn dirt (insects, etc.) from the lenses at regular
intervals, for instance when stopping for fuel.
To ensure that the system works properly in winter, keep the nozzle
holders free of snow and remove any ice with a de-icer spray.
Service position
Use the service position to change the wiper blades.You can set the wipers to the service position on the sound
system or MMI*.
– If the wiper blades are not frozen to the windscreen,
move the windscreen wiper lever to the "off" position
⇒page 65, fig. 67.
– Select: Function selector button > Windscreen
wipers > Service position ⇒fig. 68.•
on - the wiper blades can only be replaced when the wiper arms
are in the service position ⇒fig. 69. If you only work on the wipers
A5
Fig. 68 Display: Wind-
screen wipersFig. 69 Service posi-
tion
A0
CAR
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Lights and vision69
Controls
Safety
Driving tips
General maintenance
Self-help
Technical data
Anti-dazzle setting
– Pull the lever at the bottom of the mirror towards you.Applies to vehicles: with automatic anti-dazzle adjustment for interior mirrorAutomatic anti-dazzle adjustment
The automatic anti-dazzle function can be switched on
and off as desired.Switching off anti-dazzle function
– Press button ⇒fig. 71 - the indicator lamp will go
out.
Switching on anti-dazzle function
– Press button - the indicator lamp will light up.Anti-dazzle function
The anti-dazzle function is activated every time the ignition is
switched on. The green indicator lamp lights up in the mirror
housing.
When the anti-dazzle function is activated the interior mirror will
darken automatically according to the amount of light it receives
(for example from the headlights of a vehicle behind). The mirror
will not darken automatically:
•
when the interior lighting is switched on
•
when reverse gear is engaged
WARNING
Electrolyte fluid can leak from a broken mirror. This fluid can cause
irritation to the skin, eyes, and respiratory organs. Wash thor-
oughly with clean water should you come into contact with this
fluid. Seek medical assistance if needed.
Caution
Electrolyte fluid leaking from a broken mirror can cause damage to
plastic surfaces. Use a sponge or similar to remove the fluid as soon
as possible.
Note
•
If you switch off the anti-dazzle function for the interior mirror,
this will also deactivate the anti-dazzle function for the exterior
mirrors.
•
The automatic anti-dazzle function will only work properly if the
sun blind* for the rear window is not in use and there are no other
objects preventing light from reaching the interior mirror.
•
Do not attach any stickers to the windscreen in front of the
sensors, as these could lead to malfunctioning of the mirror.
Fig. 71 Anti-dazzle
interior mirror: On/off
button with indicator
lamp
AA
AB
AA
AB
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Heating and cooling95
Controls
Safety
Driving tips
General maintenance
Self-help
Technical data
Note
The grille on the control console ⇒page 94, fig. 103 must be kept
free. Please ensure that it is not covered by stickers or similar. Meas-
uring sensors are located behind it.Applies to vehicles: with deluxe automatic air conditionerSwitching on and offSwitching on air conditioner
– Press the button briefly, or
– Press the button.
Switching off air conditioner
– Press the button to switch off the air conditioner
and cut off the supply of fresh air from outside the
vehicle.The air conditioner will switch on again if one of the control buttons
is pressed.
Applies to vehicles: with deluxe automatic air conditionerAutomatic mode
The standard operating mode for all seasons.Switching on automatic mode
– Select a temperature between +16 °C (60 °F) and +28 °C
(84 °F).
– Press the button.The automatic mode maintains a constant temperature inside the
vehicle and dehumidifies the air. Air temperature, air delivery and
air distribution are regulated automatically to reach the desired
interior temperature as quickly as possible, and then to maintain
this temperature. The system automatically compensates for any
variations in the outside temperature and for the effect of direct
sunlight.
The automatic temperature regulation only operates at temperature
settings between +16 °C and +28 °C. If a temperature below +16 °C
is selected, LO appears on the display. If a temperature above +28 °C
is selected, the display will show HI. In the two extreme settings the
air conditioner operates continuously with maximum cooling or
heating output, and the temperature is not regulated
automatically.

Air distribution
⇒page 97
Defrosting windows
⇒page 98
Heated rear window
⇒page 98
Switching air cooling
on/off
⇒page 98
Seat heating
⇒page 114
a)The rotary control is also used to adjust the blower speed, air distribution
and seat heating.Button(s)
Function
Page
AC
OFFAUTOOFF
AUTO
AUTO
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