Schematic diagram of the activation mechanism

External terminal 15 supply

Convenience CAN

Voltage supply

−− Activation of light
functions
−− Calculation/activation of
headlight range adjustment

Discrete line

Voltage supply

Left LED Headlamp Power Output Module 1 A31
−− LEDs for left low beam headlight
−− LEDs for left low beam headlight
−− LEDs for left static cornering light

Sub-bus system

Vehicle Electrical System
Control Module
J519

LED headlights
(left hand side of vehicle)

Left Light Control Module J1018
−− LED for left side marker light (SAE2))
−− Left headlight range control motor

Discrete lines

Discrete lines
Left Daytime Running Lamp And Position Lamp LED
Module L176
−− LEDs for parking lights and daytime running lights
−− LEDs for left turn signal

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Activation

Service

Vehicle Electrical System Control Module J519 supplies
voltage to Left and Right Led Headlamp Power Output
Modules 1 A31/A27 and to Left and Right Light Control
Module Control Modules J1018 and J1023. J519 communicates with these modules over a sub bus system.

The basic setting of the headlight range adjustment function is configured in Vehicle Electrical System Control
Module J519. LED headlight bulbs cannot be replaced. Only
the outer units can be replaced individually after removing
the headlights.

A31 and A27 are responsible for activating the LEDs for low
beams, high beams and the static cornering light (turning
light). These modules have diagnostic capability and can be
accessed through Address Words D6 and D7.

Optional equipment
The LED headlight can be combined with main beam assist
(PR no.: 8G1).

J1018 and J1023 are responsible for the parking lights/
DRLs, turn signals, side marker lights and the headlight
range adjustment servo-motors. They have diagnostic
capability and can be accessed through Address Words 29
and 39.
Headlight range adjustment
The LED headlight has automatic dynamic headlight range
adjustment. Changes in the range of the headlight beam
due to loading of the vehicle as well as braking and accelerating are compensated.
J519 receives information on ride height from either
Comfort System Central Control Module J393 or Drivetrain
Control Module J775 if installed.

42

1)

ECE = for European market

2)

SAE = for North American Region

Tail lights
The A4 tail lights are mounted in both the fender and the
rear trunk lid. They are activated by Comfort System Central
Control Module J393.

LED tail light (PR no.: 8SP)
The figure shows the left hand tail light for the A4 sedan model in the SAE2) version.
Brake light/
turn signal

Brake light/
turn signal

Tail light

646_073

Tail light/
sidemarker

Tail light

Light functions

Brake light

Back-up light

Sedan2)
Bulb/lamp

Power

Brake light/turn signal
(dynamic)3)

12 LEDs

10 watts

Tail light3)

33 LEDs

10 watts

Brake light3)

6 LEDs

6 watts

Turn signal (dynamic)4)

18 LEDs

8 watts

Back-up light

4 LEDs

6 watts

Tail light4)

15 LEDs

4 watts

Rear fog light4), 5)

2 LEDs

4 watts

4)

Rear fog light

Special features of the light functions
The tail lights are also activated if the vehicle is equipped
with a Coming Home / Leaving Home function. Light functions are not deactivated when the rear trunk lid is open. If
the tail light is activated and the brake light is simultaneously active, the LEDs for the brake light/turn signal in the
rear trunk lid are deactivated. If the tail light is activated
and the turn signal is simultaneously active, the LEDs for
the brake light/turn signal in the rear trunk lid are also
active. Amber-colored LEDs are used for the turn signal.

2)
3)

AE = for North American Region
S
Lights in the body side panels

With the dynamic turn signal function, the LEDs for the
turn signal/brake light are briefly activated in a dimmed
manner when the turn signals are activated. After that, the
LEDs for the turn signal function are dynamically activated
in an alternating sequence to produce the dynamic effect.
Service
No bulbs/lamps can be replaced in the LED tail lights. In
the event of a fault, the complete assembly must be
replaced.
4)
5)

Lights in the rear lid
One side only
43

High-mounted brake light / license plate lights
Activation
Both the high-mounted brake light and license plate lights
are activated by Comfort System Central Control Module
J393.

They remain active even when the rear trunk lid is open.

High-mounted brake light
The high-mounted brake light is installed inside the vehicle
behind the rear window. It has 18 LEDs with a power
output of 4 watts.
In the event of failure, the entire assembly must be
replaced.

646_075

High-Mounted Brake Lamp Bulb
M25

License plate lights
The license plate lights on the Audi A4 use LED technology.
Each of the license plate lights is clipped into the luggage
compartment lid and has two LEDs.

44

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Interior lighting
Two levels of interior lighting are used on the 2017 Audi A4.
• QQ1 lighting package - standard equipment on
Premium and Premium plus models.
• QQ2 background lighting - standard equipment on
Prestige models
QQ1
Vanity lights, footwell lights, cupholder light, center
console background lighting, entry light, door panel lighting in the door trims and door inner handle lighting.
White light and LED technology are exclusively used as
light sources.
QQ2
Contour lighting in the door trim, door pocket lighting.
The LEDs are colored. 30 light colors are available. The door
pocket lighting in the Audi A4 (type 8W) is non-capacitive.
An exception is the LED in the door inner handle which
lights up in white only.

The list of interior lighting features with the various production numbers always includes the equipment with lower
production numbers.
The background lighting QQ2 is controlled by a background
lighting module. The background lighting module is a
software function and is integrated in Vehicle Electrical
System Control Module J519.
J519 is the RGB master. RGB denotes the colors red, green
and blue. The color profiles are produced by additive mixing
of these colors. In the case of additive color mixing, the
human eye is able to discern multiple wavelengths simultaneously and in quick succession, but the different colors
cannot be resolved and appear as a single color to the eye.

Apron lighting
The apron lighting is provided by 2 LEDs per door. These
LEDs also function as door handle lights.

646_004
45

Interior door trim lighting
Background lighting as shown using the door trims as an
example – the door warning light may use a conventional
bulb/lamp depending on country.

The apron lighting is integrated in all four door handles in
conjunction with PR nos. QQ1 and QQ2.
Unlike the Audi Q7, the door pocket lighting is not capacitively controlled.

Front door trim
Door panel lighting

Inner door handle light

Contour lighting

Door warning light (passive)

Exit warning
(with optional assistance system)

646_005

Door pocket lighting

Entry light

Speaker lighting

Rear door trim
Door panel lighting

Inner door handle light

Contour lighting

Door warning light

646_006

46

Door pocket lighting

Entry light

Function and control
Interior and background lighting
The following control modules connected by LIN bus are
also used:

The LEDs of the interior and background lighting are controlled by various control modules and are networked with
one another via the Convenience CAN. These are:
•
•
•
•

• Driver Side Rear Door Control Module J926.
• Passenger Side Rear Door Control Module J927.
• Roof Electronics Control Module J528.

Vehicle Electrical System Control Module J519.
Comfort System Central Control Module J393.
Driver Door Control Module J386.
Front Passenger Door Control Module J387.

• Front Roof Module WX3.
• Rear Interior LampWX2.

WX2

Rear left reading
light

Rear right reading
light

WX3

Front left reading
light

Front right reading
light

J528

Front footwell light
LIN 2

Vanity light, left/
right
Glove box

Rear footwell light

Storage
compartment

J519

Apron lighting

Apron lighting

Door warning
light1)

Door warning
light1)

Entry light

Entry light

J386

Inner door handle

Speaker

LIN2)

LIN2)

Speaker

J387
Convenience CAN

Inner door handle

Door warning
light1)

Door warning
light1)

Entry light

Entry light

Inner door handle

J926

J393

Apron lighting

J927

Inner door handle

Apron lighting

646_007

Luggage compartment
1)

Country-dependent

2)

Door control module LIN bus
47

RGB components

The RGB components of the background lighting are controlled by Vehicle Electrical System Control Module J519.
The individual LEDs or optical fibers are supplied via 2 LIN
bus lines.

LIN 6

LIN 5

J519

Footwell

Cupholder

Footwell

Door shoulder

Door shoulder

Speaker

Speaker

Center console
Door pocket

Door pocket

Door shoulder

Door shoulder

Speaker

Speaker

Door pocket

Door pocket

Footwell

48

Footwell

646_008

Overhead module
The overhead module is used to activate and read in the
following components:
•
•
•
•
•
•

Roof Electronics Control ModuleJ528.
Sliding sunroof operating button.
Garage Door Opener Control Head E284.
Front interior lights.
Hands-free telephone microphone.
Front Passenger Airbag -Disabled- Indicator Lamp
K145.

Sliding sunroof operating button

The interior lights are capacitive. The interior lights use LED
technology.
J528 is a LIN participant of J519.

Microphone

Motion detectors of the interior monitoring system
integrated in the anti-theft alarm

Garage Door Opener
Control Head
E284

Microphone

646_009

Interior light

Interior light

Front Passenger Airbag -Disabled- Indicator Lamp
K145

49

Audi drive select
Functional characteristics
The Audi A4 is equipped with Audi drive select.
With Audi drive select, it is possible to modify the vehicle
characteristic. The mode can be changed when the car is
stationary with the ignition switched on or while driving.
In the Audi A4, the driver can select between the following
drive modes:
•
•
•
•

comfort.
auto.
dynamic.
individual.

Audi drive select affects the following equipment:
•
•
•
•
•
•
•
•
•
•
•

Automatic transmission.
Sport differential (not available at vehicle introduction).
Climate control system.
Cornering light.
Ambient lighting.
Dynamic steering (not available at vehicle introduction).
Damper control.
Cruise control system.
Distance regulation.