2005 AUDI A6 headlights

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External lights
Front headlights
Three different front headlights are used in the
Audi A6 ’05:
– Halogen headlights
–Bi-xenon headlights
–Adaptive light
Halogen headlights
Halogen headlights come as standard.
The following lamps are fitted in the halogen on the
vehicle equipment:
– W5W lamp for parking light
– H1 lamp for high beam headlight and headlight
flasher
– H7 lamp for dipped beam headlight and dimmed
as a daytime driving light
– An orange PY21W bulb as the direction indicator
light
The daytime driving light in the halogen headlight is
only available for Canada and the Northern
countries (Scandinavia). It is active when
terminal 15 is switched on and the parking light or
dipped beam light is off.
The following country-specific variants exist:
– The daytime driving light is part of the fog lights
for Canada and
– 3457NA flasher lamps are used for USA and
Canada.
A manual headlight range control system – with
potentiometer – is installed for halogen headlights.
Convenience electrics
326_087
326_149
12 3 4 5
1W5W lamp
2H1 lamp
3H7 lamp
4 PY21W lamp
5D2S lamp

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Bi-xenon headlights
Bi-xenon headlights are installed with the
"XenonPlus" option.
The following lamps are fitted in the bi-xenon
headlight:
– A blue W5W lamp for the parking light.
The colour of the parking light thus corresponds
to the xenon light.
– A D2S lamp for high beam headlight, headlight
flasher and dipped beam headlight. The covers
fo r d i p p ed b e am a re al s o a c t i v at e d fo r h i gh b ea m
and headlight flasher operation.
– A P21W lamp for the daytime driving light.
This comes on dimmed to 90 %.
– A PY21W bulb coated with a reflecting layer of
silver is used as the direction indicator light.
Only longlife lamps are used. A super-longlife
lamp is used as the daytime driving light.
The following country-specific variants exist:
– No daytime driving lamp is fitted for Japan.
– 3457NA flasher lamps are used for USA and
Canada.
The headlights are changed over to left-hand drive
via a lever on the projection module.
A dynamic headlight range control system is
installed for bi-xenon headlights.
The dynamic headlight range control system uses
the well-known level sensors. This send the
information about the vehicle level to the control
unit for headlight range control J431 via a pulse
width-modulated signal.
The same level sensor is fitted on both the front and
rear axle.
Headlights are also available with dynamic
corner-sensitive lights.
326_088
326_124

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Adaptive light
The adaptive light works as a dynamic corner-
sensitive headlight. With the dynamic cornering
headlight, the headlight projection module is
pivoted horizontally by an integrated motor.
The headlight lenses and the bracket do not turn.
The pivot angle is approx. 15° on the inner curve
side and 7.5° on the outer curve side.
The various pivot angles have advantages in that
they provide better lighting for corner routes.
In this case, the inner-curve module pivots in twice
as much as the outer-curve module.
This achieves the maximum possible illumination
width with homogeneous light distribution.
No pivoting when vehicle is stationary
The projection modules are not pivoted at driving
speeds of < 6 km/h.
The pivot angle essentially depends on the steering
wheel angle at speeds of more than 10 km/h.
This complies with the legal requirement that the
headlights must not be pivoted when the vehicle is
stationary. At the same time, a slight transition to
headlight pivoting occurs during acceleration from
idle when the steering lock remains constant.
Convenience electrics
326_077
Pivot range
326_076

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Internal structure
The pivot angle is monitored by an inductive pickup
in the pivot module. The pickup value is evaluated
immediately in the relevant power module for
headlights as a pulse width-modulated signal.
If the motor or pickup does not function, the power
module sends an error message to the control unit
for headlight range control J431.
This is communicated to the driver in a display in
dash panel insert J285.
The same lamps that are used in the bi-xenon
headlight are also used in the adaptive light
headlight.
CAN Communication
The values marked with (*) are used as input
variables in calculating the pivot angle.
All other input variables are only needed for
dynamic headlight range control.
326_079 Data bus diagnosis
interface J533 Co n t ro l u n it fo r h e a d li g h t ra n g e c o n t ro l
J431
Steering-angle sensor G85
Steering wheel angle*
Steering wheel angle speed*
Control unit for ABS with EDL J104
Wheel speeds*
Directions of travel*
Brake light switch signal
Yawing speed*
Brake pressureControl unit for on-board power supply
J519
Dipped beam on*
Control unit for access and
start authorisation J518
Te r m i n a l X
Te r m i n a l 5 0
Gas discharge light L13/L14
326_135
Control motor for dynamic
cornering light V318/V319
Magnet for headlight cover adjustment
N395/N396Sensor for pivot module
position G474/G475

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Signal and data exchange
The same sensors that are used for dynamic
headlight range control for bi-xenon headlights are
also used as level sensors. They send a pulse
width-modulated signal to the control unit for
headlight range control. Data is exchanged between
t h e c o n t ro l u n i t fo r h e ad l i gh t ra n g e c o n tro l J 4 3 1 an d
the power modules in the headlight on the left J667
and right J668 via a 500-kBaud CAN.
Show Room function
The Show Room function can be used to pivot the
headlights by moving the steering wheel – even
when the vehicle is stationary – for presentation.
The function can be adapted using the diagnosis
tester in the control unit for headlight beam
adjustment.
If the vehicle is then driven at more than 30 km/h,
the function is permanently disabled. The function
can be switched on again at any time using the
diagnosis tester.
Convenience electrics
326_074
Audi
Audi A6 2005>
2005 (5)
Saloon
BBJ 3.0l Motronic / 160 kW Guided fault-finding
Function/component selection
Selecting a function or component
Body (Rep. Gr. 01; 50 - 97)
Electrical system (Rep. Gr. 01; 27, 90 - 97)
01 – Self-diagnosis systems
55 – Dynamic headlight range control
J431 – Dynamic headlight range control, Functions
J431 – Contr. unit, head. range control (HRC), General system descr.
J431 – Control unit for headlight range control (HRC), Adaptation
J431 – Contr. unit, head. range control (HRC), Adapt. – Show Room
J431 – Control unit for headlight range control (HRC), Coding
J431 – Control unit for headlight range control (HRC), Replacing
J431 – Control unit for headlight range control (HRC), Basic setting
J431 – Contr. unit, head. range contr. (HRC), Read. meas.-val. blocks
J431 - Contr. unit, head. range control (HRC), selective actuator test
J431 – Contr. unit, head. range contr. (HRC), sequential actuator test
326_085

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High variant ECE
These back lights are installed if bi-xenon headlights
at least are fitted as the front headlights.
The external feature of the High back lights is the
use of LEDs for the brake light.
The LEDs, which are fixed in the reflector housing,
are activated by two contacts from the lamp
bracket.
The rear fog light is located at the bottom of the
back light. Here, the lamp on the driver’s side is
used as the rear fog light, while the lamp on the
passenger’s side serves as the reversing light.
This means that the same lamp bracket can be used
for both the High back light and the Basic back light.
Convenience electrics
326_152 Direction
indicator light
Rear fog light Brake light
Tail lights
Direction
indicator
light
Reversing lightBrake light
Tail lights

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System overview
Convenience electrics
– Hall sender 1 for vertical adjustment of the
steering column
– Hall sender 2 for axial adjustment of the
steering column
– Bonnet switch for anti-theft warning system–Rotary light switch
–Hazard warning button
– Switch for reversing light (manual transmission)
– Sensor for rain and light detection (via LIN bus)
– Front direction indicator lights, left and right
– Side direction indicator lights, left and right
– Front parking light, left and right
– Dipped beam headlight, left and right
– High beam headlight, left and right
– Fog lights, left and right
– Relay for headlight cleaning system
– Windscreen washer pump
– Control unit for wiper motor (via LIN bus)– Supply, terminal 58
– Front footwell lights, left and right
– Relay for dual-pitch horn
– Steering column adjustment (vertical/axial)
– Selector lever lighting
– Indicator light for hazard warning lights
– Magnets for cover adjustment
Headlights (left and right)
326_110
The control unit for on-board power supply J519 evaluates the following input signals:
The control unit for on-board power supply J519 controls the following loads: