Audi Q8 (type 4M)

Self-study programme 672

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For internal use only

Audi Service Training

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The Audi Q8: The new face of the Q family

The Audi Q8 combines the best of two worlds – the refined ele- Its coupé-like roof line gives it a significantly flatter look than its
gance of a four-door luxury coupé and the practical versatility sister model, the Q7 (type 4M); it is 66 mm shorter yet 27 mm
of a large SUV. The new top-of-the-line model of the Q family wider. Strong contours and taut, athletic surfaces convey power,
demonstrates luxury-class prestige in every detail. Its generously high quality and the special dynamics of the permanent four-wheel
sized interior with variable luggage compartment, cutting-edge drive system. The Q8 offers its very own interpretation of the
operating and running gear technology and its intelligent driver progressive design language which was introduced with the Audi
assist systems make the Audi Q8 an assured companion for busi- A8, fusing the attributes of an elegant four-door luxury coupé with
ness and leisure. those of a handsome SUV, and including echoes of an Audi icon:
the original quattro. With the striking single-frame grille in octag-
A powerful yet efficient 3.0 ltr. TDI engine with mild hybrid tech- onal design, the Audi Q8 presents the new face of the Q family.
nology provides the dynamic characteristics promised by the
muscular design. With quattro permanent four-wheel drive and Like the Audi Q7, the Audi Q8 is built at the Bratislava factory.
ground clearance of up to 254 mm, the SUV coupé is equally at
home away from sealed roads.
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672_001

!
Note
The self-study programme provides basic information on the design and function of new vehicle models, new
components or new technologies.
It is not a Workshop Manual. Any figures given here are for explanatory purposes only and refer to the
data valid at the time of writing. Content is not updated.
Reference
It is essential that you refer to the latest technical literature when carrying out maintenance and repair work.

2
 Contents
Introduction
Presentation___________________________________________________________________________________________________________________________________________________ 4
Dimensions____________________________________________________________________________________________________________________________________________________ 6

Body
Overview_______________________________________________________________________________________________________________________________________________________ 8
General body repairs ________________________________________________________________________________________________________________________________________ 10

Power units
Diesel engines________________________________________________________________________________________________________________________________________________ 14
Petrol engines________________________________________________________________________________________________________________________________________________ 15
Exhaust system______________________________________________________________________________________________________________________________________________ 16
Fuel tank______________________________________________________________________________________________________________________________________________________ 18
Engine mounting____________________________________________________________________________________________________________________________________________ 20
“Dip” engine mountings____________________________________________________________________________________________________________________________________ 21
Engine/gearbox combinations_ ____________________________________________________________________________________________________________________________ 22

Power transmission
Overview______________________________________________________________________________________________________________________________________________________ 24
Selector mechanism for automatic gearbox______________________________________________________________________________________________________________ 26
8-speed automatic gearbox 0D5___________________________________________________________________________________________________________________________ 28
Functions influencing gearbox control____________________________________________________________________________________________________________________ 34

Running gear
Overview______________________________________________________________________________________________________________________________________________________ 40
Axles__________________________________________________________________________________________________________________________________________________________ 41
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Adaptive air suspension_____________________________________________________________________________________________________________________________________ 42

Steering system______________________________________________________________________________________________________________________________________________ 45
Brake system_________________________________________________________________________________________________________________________________________________ 47
Wheels and tyres, tyre pressure monitoring______________________________________________________________________________________________________________ 49

Electrics and electronics

48 Volt MHEV electrical system____________________________________________________________________________________________________________________________ 50
Networking___________________________________________________________________________________________________________________________________________________ 52
Topology______________________________________________________________________________________________________________________________________________________ 54
Exterior lighting_ ____________________________________________________________________________________________________________________________________________ 58
Tail lights_____________________________________________________________________________________________________________________________________________________ 60

Convenience electronics
Overview______________________________________________________________________________________________________________________________________________________ 62
Rear view mirrors____________________________________________________________________________________________________________________________________________ 63
MOST bus_____________________________________________________________________________________________________________________________________________________ 64
Interior lighting______________________________________________________________________________________________________________________________________________ 65
Convenience system central control unit J393_ __________________________________________________________________________________________________________ 66
Instrument clusters_________________________________________________________________________________________________________________________________________ 67

Air conditioning
Overview______________________________________________________________________________________________________________________________________________________ 68

Safety and driver assist systems

Overview______________________________________________________________________________________________________________________________________________________ 70
System overview_____________________________________________________________________________________________________________________________________________ 72
Camera-based trailer assist_________________________________________________________________________________________________________________________________ 76

Infotainment and Audi connect

Introduction and overview of versions_ ___________________________________________________________________________________________________________________ 84
Sound_________________________________________________________________________________________________________________________________________________________ 88
Aerials_ _______________________________________________________________________________________________________________________________________________________ 92
Networking___________________________________________________________________________________________________________________________________________________ 95
Online system update _ _____________________________________________________________________________________________________________________________________ 96

Inspection and maintenance

Service interval display______________________________________________________________________________________________________________________________________ 99

Appendix
Test your knowledge______________________________________________________________________________________________________________________________________ 101
Self-study programmes___________________________________________________________________________________________________________________________________ 103
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Introduction
Air conditioning
Presentation The new allergen air filter, which is fitted as
standard, ensures high air quality by reducing
fine particulate matter, harmful gases and
As Audi’s SUV crossover model, the Audi Q8 features expressive
allergens inside the vehicle. Premium air quality
design with a new octagonal single-frame grille and characteristics is provided by very good use of fragrance and
reminiscent of the original Audi quattro. ionisation.
Like the Audi A8 (type 4N), the Audi Q8 is based on Mild Hybrid
Electric Vehicle (MHEV) technology. Below you will find summa-
rised the key features of the new Audi Q8.

Engines
High performance and efficiency provided by
powerful TDI and TFSI engines with 48V mild
hybrid system.

Driver assist systems

The sensor for adaptive cruise control J428 is
fitted in the single-frame grille (top left). The
control unit for laser distance control J1122
is fitted in the single-frame grille (top right).
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LED headlights Displays and operation

Standard LED headlights with a colour tem- Up-to-date MMI touch response display and
perature similar to daylight. Optional Audi operating concept using two touch displays
matrix LED headlights for perfect lighting. with haptic feedback. An Audi virtual cockpit
with full HD resolution and a head-up display
are available as optional extras.

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672_002

Running gear
Adaptive shock absorbers as standard; adaptive air
suspension and four-wheel steering as optional extras
to optimise the vehicle’s dynamic characteristics.

Body
The lightweight body has a multi-material construc-
tion which ensures optimum functions and weight.
Frameless front and rear door windows, and a two-
part panoramic sunroof as an optional extra.

Power transmission

>> 8-speed automatic gearbox

>> quattro with self-locking centre differential and final drive with
open differential on rear axle
>> The driver’s commands are transmitted from the selector mecha-
nism to the gearbox via shift-by-wire technology.

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Dimensions

17051)

1086

1679 1691

1995 2190
672_003
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1044 3

751
981

820

978 2995 1013

4986

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15722

15592

1086
1512

1486
1100

672_005
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Exterior dimensions and weights Interior dimensions and other

specifications
Length in mm 4986 Front cabin width in mm 15723)
Width (not incl. mirrors) in mm 1995 Front shoulder width in mm 15124)
Width (incl. mirrors) in mm 2190 Rear cabin width in mm 15593)
Height in mm 1705 1)
Rear shoulder width in mm 14864)
Front track in mm 1679 Load sill height in mm 820
Rear track in mm 1691 Luggage compartment capacity in 6055)/17556)
Wheelbase in mm 2995 ltr.

Unladen weight in kg 22202) Drag coefficient cw 0.34

Max. gross weight in kg 28902) Capacity of fuel tank in ltr. 75/857)

1)
Including roof aerial
2)
50 TDI quattro with steel suspension
3)
Elbow room width
4)
Shoulder room width
5)
Seat bench in rearmost position, load up to top edge of backrest
6)
With rear seat backrest folded down, load up to roof
7)
Optional

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Body
Overview
The body of Audi Q8 has a multi-material construction; in terms of 15 % of the body is made of high-pressure aluminium die castings;
layout and construction, it is largely similar to the Audi Q7 (type this includes the suspension turrets in the engine compartment and
4M). The lightweight body contains many aluminium and hot- the connections between the side members and longitudinal
formed steel components; these steel components form the members. Aluminium panels are used for the side frame and large
ultra high-strength backbone of the occupant cell and are used areas of the floor, the rear wheel housings and the roof, as well as
for 14.4 % of the bodyshell. for the frameless doors, the front wing panels and the rear lid; they
make up 23.7 % of the body.

Joining techniques

The following joining techniques are used during the manufacture of the multi-material body:
>> Resistance spot welding for steel >> Semi-tubular punch riveting
>> MAG welding >> Pop riveting
>> Laser welding for aluminium >> Flow-drill screws
>> Laser welding for steel >> Clinching
>> MIG welding >> Seaming
>> Friction element welding >> Bonding

Key:

Sheet aluminium
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Die-cast aluminium
Aluminium section
Ultra-high-strength steel (hot-formed)
Modern high-strength steel
High-strength steel
Soft steel

Reference
For further information on the construction and structure of the body, please refer to self-study programme 632:
“Audi Q7 (type 4M)”.

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General body repairs

Although it is very easy to see that the Audi Q8 is related to the differences with regard to several service-related aspects, including
Audi Q7 (type 4M) in technological terms, there are some major general body repair work.

Front bumper

The high quality standards of the body of the Audi Q8 are empha- Once the two securing bolts have been loosened, the eccentric
sised among other things by extremely accurate and even gap adjuster at the upper bolt can be turned – for example using the
widths. To ensure that the original gap widths are restored cor- socket wrench from the rear window adjusting tool V.A.G 1739 –
rectly, for example after any repair work performed on the body and the position of the headlight in relation to the bonnet and the
following an accident, there are numerous adjustments which can bumper cover can be adjusted precisely.
be made on the doors, bonnet, rear lid and bumpers.
To adjust the gap widths at the front end of the Audi Q8, a new
type of eccentric adjuster is featured in the headlight mounting.
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Securing bolts
672_007

Eccentric adjuster

Adjuster in “zero” position

672_008

!
Note
When fitting the headlight mounting, it is important to turn the eccentric adjuster to the “zero” position. To ensure that this
is the case, the two markings must align. If this is done, there will be no hindrances when adjusting the bumper during the
subsequent installation procedure.

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Frameless door windows

The door windows on the Audi Q8 are frameless. The lateral Parallel adjustment of the rear door window to the front door
adjuster is used to determine the incline of the window and there- window and to the side window is performed by moving the
fore the pressure it exerts on the inner door seal. To perform window in the clamping jaws of the window regulators.
adjustment, the adjuster with which the window regulator is If any windows have not been adjusted correctly, this may result in
secured in the door must be rotated. The height adjuster deter- wind noise, moisture or frozen door windows in winter.
mines the immersion depth of the window in the roof frame seal.
To perform adjustment, the adjuster screw on the window mount-
ing in the window regulator must be rotated.

Adjuster (lateral adjustment)

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Securing bolt
in clamping
jaws

672_009

Adjuster screw (height adjustment)

Roof frame seal Roof trim strip

Inner door seal

Door window

672_010

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Electric luggage compartment cover

The Audi Q8 can be equipped with an electric luggage compart- The number of motor revolutions is measured via a Hall sensor, the
ment cover as an optional extra. In technical terms, the system is sender for luggage compartment cover G758.
the same as the one in the Audi Q7 (type 4M). However, when the To prevent any folds or creases from forming in the cover, it is
rear lid is opened the luggage compartment cover moves forward important for both actuators to run synchronously. It must there-
almost horizontally in the luggage compartment side trim rather fore be ensured that the Bowden cables are routed correctly. In
than being raised into the D-pillar trim. The motor for luggage particular, they must not be twisted when they are secured in the
compartment cover V473 is located on the rear cross panel and is double clips. If the actuators are still not positioned in parallel, the
activated by the rear lid control unit J605. Using a reel and Bowden Bowden cable can be corrected using the adjuster.
cables, this moves two actuators forwards or backwards, depend- When removing the actuators, it is essential to pull out the secur-
ing on the direction in which the electric motor is rotating. This ing pins carefully to ensure that the entire drive unit cannot be
opens or closes the luggage compartment cover. damaged.

Actuator

Securing pin
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672_011

Motor for luggage compartment cover Adjuster Double clip

V473

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Panoramic sunroof

The Audi Q8 can be fitted with a two-part panoramic sunroof as an sunroof frame. At the bottom, the front drain hoses lead to the
optional extra; the front glass element can be opened electrically plenum chamber and the rear ones to the rear wheel housings.
or can be tilted open at the rear. When routing the hoses, it is important to make sure that you do
The rear panel is fixed; it is also made of glass and ensures a not pull on them while connecting them. They must be connected
particularly light-filled and friendly ambience inside the vehicle. in such a way that they are not stretched; equally, they must not
The power-operated sunroof sun blind is light-proof; it offers hang down.
100 % protection against the sun and therefore ensures that less For greater clarity, the front drain hoses have red markings, while
heat builds up inside the vehicle. the rear left hose has blue and the rear right hose green markings.
A total of four water drain hoses make sure that rainwater, for The hoses must be secured in their retainers at these markings.
example, which has entered between the glass panel and the
sunroof frame is drained off reliably.
The hoses are attached directly to ball-shaped couplings on the

Water drain grommet in plenum chamber

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672_012

672_013

Hose retainer Coloured marking

672_014

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Power units
Diesel engines
Torque/power curve of Torque/power curve of Torque/power curve of
3.0 ltr. TDI engine EA897evo2 3.0 ltr. TDI engine EA897evo2 3.0 ltr. TDI engine EA897

Engine with code DHXA Engine with code DHXC Engine with code CVMD

Power in kW Power in kW Power in kW

Torque in Nm Torque in Nm Torque in Nm
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Engine speed [rpm] 672_015 Engine speed [rpm] 672_016 Engine speed [rpm] 672_017

Features Technical data

Engine code DHXA DHXC CVMD

Type V6 engine with 90° V angle V6 engine with 90° V angle V6 engine with 90° V angle

Capacity in cm3 2967 2967 2967

Stroke in mm 91.4 91.4 91.4

Bore in mm 83.0 83.0 83.0

Number of valves per cylinder 4 4 4

Firing order 1-4-3-6-2-5 1-4-3-6-2-5 1-4-3-6-2-5

Compression ratio 15.5 : 1 15.5 : 1 16.0 : 1

Power output in kW at rpm 210 at 3500 – 4000 170 at 3250 – 4750 183 at 3000 – 4500

Torque in Nm at rpm 600 at 2250 – 3250 500 at 1750 – 3250 600 at 1500 – 2750

Fuel Diesel to EN 590 Diesel to EN 590 Diesel to EN 590

Turbocharging Single turbocharger with Single turbocharger with Single turbocharger with
variable turbine geometry variable turbine geometry variable turbine geometry
(VTG) and E-positioner (VTG) and E-positioner (VTG) and E-positioner

Engine management Bosch MD1 with OBD Bosch MD1 with OBD Bosch MD1 with OBD

Max. injection pressure in bar 2000 2000 2000

Emission control NOX storage catalytic con- NOX storage catalytic con- NOX storage catalytic con-
verter with SCR-coated verter with SCR-coated verter with SCR-coated
diesel particulate filter diesel particulate filter diesel particulate filter
Emission standard EU6 (AG) EU6 (AG) EU5 plus

Concept Mild hybrid (48V) Mild hybrid (48V) Start/stop & recuperation

Reference
For further information on the engines used, please refer to SSP 655 “Audi 3.0l V6 TFSI engine
of EA839 series” and SSP 656 “3.0l TDI engine of EA897evo2 series”

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Petrol engines
Torque/power curve of Torque/power curve of
3.0 ltr. TFSI engine EA839 2.0 ltr. TFSI engine EA888, gen. 3
(only for China)

Engine with code DCBD Engine with code DMFA

Power in kW Power in kW
Torque in Nm Torque in Nm
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Engine speed [rpm] 672_018 Engine speed [rpm] 672_019

Features Technical data

Engine code DCBD DMFA

Type V6 engine with 90° V angle Four-cylinder in-line engine

Capacity in cm3 2995 1984

Stroke in mm 89.0 92.8

Bore in mm 84.5 82.5

Number of valves per cylinder 4 4

Firing order 1-4-3-6-2-5 1–3–4–2

Compression ratio 11.2 : 1 9.6 : 1

Power output in kW at rpm 250 at 5300 180 at 5000 – 6000

Torque in Nm at rpm 500 at 1500 – 5300 370 at 1600 – 4500

Fuel Premium unleaded 95 RON Premium unleaded 95 RON

Turbocharging Turbocharger with wastegate Turbocharger with wastegate

Engine management Bosch MDG 1 Bosch MDG 1

Max. injection pressure in bar 250 250

Emission control 2 close-coupled ceramic catalytic converters, Close-coupled ceramic catalytic converter,
Lambda probe before and after catalytic Lambda probe before and after catalytic
converter converter

Emission standard EU4, C6b, EU6 AJ/K/L, EU6 BG/H/I C6b

Concept Mild hybrid (48 V) Start/stop & recuperation

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Exhaust system
Overview of exhaust systems in Audi Q8 Catalytic converter with Lambda probe

R4 TFSI

Flexible pipe

Silencer

NOX storage catalytic converter

SCR-coated
diesel particulate filter

V6 TDI

Flexible pipe

Particulate sensor

NOX sensor
Trap catalytic con-
verter
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Exhaust gas recirculation valve

with exhaust gas
recirculation control motor 2 V339

Exhaust gas recirculation

cooler

Exhaust flap
control unit
Flexible pipe J883
V6 TFSI

Catalytic converter with Lambda probe

Flexible pipe

Silencer

Centre silencer

Reference
For further information on the exhaust systems used, please refer to SSP 655 “Audi 3.0l V6 TFSI engines
of EA839 series” and SSP 656 “3.0l TDI engine of EA897evo2 series”

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Centre silencer

Rear silencer
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Rear silencer

672_020

Rear silencer

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Fuel tank
A plastic fuel tank with a capacity of 75 litres is fitted. If the The end of the pipe from this valve is located in the upper part of
vehicle has an auxiliary heater, the capacity is 85 litres. The only the liquid trap. The TFSI tank requires several roll-over valves for
differences between versions for TFSI and TDI are inside the tank. breathing.
In both tank cells, a tank cut-off valve is fitted in the lower part of
the tank.

Implementation of different capacities

On the Audi Q8, the different capacities are implemented by

deactivating the fuel tank cut-off valves at an earlier or later point.

Connection for auxiliary heater

Tank cut-off valve

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Drive line

Reservoir with integrated fuel filter

in delivery unit (long-life)
Aggregate jet line

Liquid trap

Reference
For further information on the design of the SCR system, please refer to self-study programme 632 “Audi Q7 (type 4M)”.

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How the tank is emptied

When the vehicle is being driven, fuel is initially pumped into the Using the Venturi effect, the fuel is conveyed from the side
main chamber by the suction-jet pump in the side chamber of the chamber to the main chamber via the aggregate jet line (large
fuel tank, and from there to the engine. The fuel is pumped from diameter, lower speed).
the main chamber to the side chamber through the drive line
(small diameter, high speed).

672_021

Breather line

Filler neck
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Engine mounting
For all engine types, the Audi Q8 is fitted with a three-point engine The “dip”* engine mountings are fitted on V6 TDI power units,
mounting (two mountings on the engine and one on the gearbox); while the familiar switchable electrohydraulic engine mountings
however, the mountings differ on the V6 engines. are used on the V6 TFSI.

V6 TFSI

Hydraulic gearbox mounting

672_022
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Right electrohydraulic engine Left electrohydraulic engine

mounting solenoid valve mounting solenoid valve
N145 N144

Hydraulic gearbox mounting

The hydraulic gearbox mounting is installed at the rear section of

the gearbox and counteracts the drive forces. The hydraulic action
improves vibration damping for a smoother ride.

Bracket

Mounting

672_023

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“Dip” engine mountings

The “dip”* engine mountings have the advantage that they prevent atmosphere via a boot. When the engine is idling (switch open),
issues with engine rough idle – even more effectively than the the hydraulics operate against an air chamber (engine mountings
“standard” switchable electrohydraulic mountings. This is thanks soft); when the switch is closed, the air chamber is pumped empty
to a second, central hydraulic duct which is separated from the air/ (engine mountings hard).

The current status of the engine mountings can be read out via the vehicle diagnostic tester using the measured values function.
>> Bit value 0: engine mountings soft
>> Bit value 1: engine mountings hard
The engine mountings are not activated by their own control unit; this function is performed by the engine control unit.

Air chamber
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672_024
V6 TDI

Hydraulic gearbox mounting

672_025

Right electrohydraulic engine Left electrohydraulic engine

mounting solenoid valve mounting solenoid valve
N145 N144

* The dip function of the “dip” engine mountings serves to reduce dynamic rigidity.

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Engine/gearbox combinations

Diesel engines1) 3.0 ltr. TDI, EA897evo2 series 3.0 ltr. TDI, EA897 series
170 kW – 210 kW 183 kW

Engine code / DHXC / 45 TDI quattro CVMD / 45 TDI quattro

power output designation DHXA / 50 TDI quattro

8-speed automatic gearbox 0D5

AL552-8Q

Rear final drive 0G2

HL195.S3 M
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PR No.: GH12)

Power output designation

For the power output designation on the rear of the Audi Q8, the allocation of the power codes to the available engines is shown in the
following table:

45 50 55

170 kW, 3.0 ltr. TDI, engine code DHXC, 210 kW, 3.0 ltr. TDI, engine code DHXA, 250 kW, 3.0 ltr. TFSI, engine code DCBD,
EA897 evo 2 series EA897 evo 2 series EA839 series
180 kW, 2.0 ltr. TFSI, engine code DMFA,
EA888 gen. 3 series
183 kW, 3.0 ltr. TDI, engine code CVMD,
EA897 series

Reference
For more detailed information on the power output designation, please refer to self-study programme 670
“Audi A6 (type 4A)”.

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Petrol engines1) 2.0 ltr. TFSI, EA888 gen. 3 series 3.0 ltr. TFSI, EA839 series
180 kW (for China only) 250 kW

Engine code / DMFA / 45 TFSI quattro DCBD / 55 TFSI quattro

Power output designation

8-speed automatic gearbox 0D5

AL552-8Q

Rear final drive 0G2

HL195.S3 M
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PR No..: GH12)

Key to manufacturer code designation

8-speed automatic gearbox AL552-8Q

Gearbox type Orientation Development number Number of gears Front-wheel drive /

A = Automatic L = Longitudinal (indicating torque capacity, four-wheel drive
planetary gearbox generation and position of front Q = Four-wheel drive
final drive) with integrated
transfer box

Rear final drive

HL195.S3 M

Fitting location Orientation Crown wheel diameter Final drive type Version Manufacturer code:
H = Rear L = Longitudinal in mm S = Standard 3rd generation M = Magna powertrain
(open differential)

The Audi Q8 is only available with an automatic gearbox. The engine/gearbox combinations shown here may not be offered in all markets
and may only be available after the vehicle’s market launch. The list offers no guarantee of completeness.

1)
Some engines of the various series are offered with different power outputs and are allocated to the corresponding power output designa-
tions. This takes e.g. country-specific power variations into account. The engines are distinguished from each other by the engine code.

2)
Production number GH1: basic rear final drive (open differential)

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Power transmission
Overview
At market launch, the Audi Q8 will be introduced with the 8-speed The selector mechanism has been taken from the Audi A8 (type 4N);
automatic gearbox 0D5 and rear final drive 0G2. This drive version, it transmits the driver’s commands using full shift-by-wire
which features a self-locking centre differential in the 0D5 gearbox technology.
and open differential on the rear axle, is already used on the Audi The function and design of this selector mechanism are described in
Q7 (type 4M); refer to SSP 632. SSP 632: Audi Q7 (type 4M). Refer to page 26 for more information.

It will be possible to order a sport differential as an optional extra The actuation of the parking lock is electrohydraulic; refer to
at a later time for the Audi Q8, depending on the engine version. SSP 457, page 48 ff. The layout of the manual release mechanism
Information on the sport differential can be found in SSP 651. for the parking lock is similar to that on the Audi Q7 (type 4M) and
has been modified for the Audi Q8 (see below).
The 8-speed automatic gearbox 0D5 is essentially the same as the
gearbox used in the Audi A8 (type 4N). The differences in the Coolant return line
gearboxes used in the various engine/gearbox combinations
are explained on page 28.

3.0 ltr. TDI engine

DHXA

Selector mechanism,
see page 26
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8-speed automatic gearbox 0D5,

see page 28

Coolant supply
line

Gearbox oil cooling valve N509,

controls ATF temperature regulation
on vehicles with 3.0 ltr. TDI engine
DHXA, see page 32

3-point engine mounting,

see page 20

Parking lock manual release

The construction and operation of the manual release mechanism
for the parking lock are similar to those of the manual release Socket wrench for manual release
mechanism on the Audi Q7 (type 4M), see SSP 632, page 48. (in vehicle tool kit)

Caution! Before operating the manual release mechanism, the

vehicle must be secured to prevent it from rolling away.

672_028

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Rear final drive 0G2

At market launch, all Audi Q8 vehicles will be equipped with the The rear final drive 0G2 is fitted using a 4-point mounting on the
rear final drive 0G2. The rear final drive 0G2 features an open subframe (see SSP 632). The radial bonded rubber mountings (not
differential and has the internal factory designation HL195.S3. including the additional mounting) must be fitted in a specified
position according to the instructions in the Workshop Manual.

Rear final drive 0G2 Oil deflector for precise lubrication;

>> With measures to increase efficiency enables oil level to be reduced, which in turn
reduces churning losses

Low-viscosity gear oil

reduces frictional losses
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Low-friction, two-row radial

angular contact ball bearings

672_026

Propshaft
Rear final drive 0G2

Bonded rubber bush

Bonded rubber bush

Additional
mounting

Bonded rubber bush

672_027

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Selector mechanism for automatic gearbox

The selector mechanism from the Audi A8 (type 4N) has been used This means that parking lock operation is also fully automatic. The
on the Audi Q8. The Audi Q8 (type 4K) therefore uses the current term used for this is "park-by-wire" (PBW).
Audi selector mechanism design with full shift-by-wire (SBW)
capability.

The technology featured in this selector mechanism was intro-

duced in the Audi Q7 (type 4M) in model year 2016 and can now be
found in the following models together with the corresponding
operating concept:
>> Audi R8 (type 4S)
>> Audi A4 (type 8W)
>> Audi Q5 (type FY)
>> Audi Q7 (type 4M)
>> Audi A8 (type 4N)

The design has been modified

to suit the vehicle’s interior
in each case.
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Function diagram – selector mechanism 672_029

E313 Selector lever (selector mechanism) comprises:

G727 Selector lever position sender
G868 Sender for lateral selector lever lock
J587 Selector lever sensors control unit
N110 Selector lever lock solenoid
V577 Motor for lateral selector lever lock

The complete unit must be renewed if one of these

components is defective.

E681 Button for selector lever release

E816 Parking lock button
K320 Parking lock indicator lamp
672_030
Y5 Selected range display

The Y adapter VAS 642 001 enables measurement

CAN High between the selector mechanism (selector lever E313)
Dash panel insert CAN and the selected range display Y5.
CAN Low

Reference
For important information on the selector mechanism concept and operation, please refer to SSP 632 “Audi Q7 (type 4M)”,
SSP 643 “7-speed dual clutch gearbox 0BZ”, SSP 644 “Audi A4 (type 8W)” and 662 “Audi A8 (type 4N)”.

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Cap

Bolt

Selector lever
handle

Release button
Button for selector
lever release P button
E681 Parking lock button E816 with parking lock indica-
tor lamp K320. K320 illuminates the P button to
the dimmed setting and lights up brightly when
the parking lock is active.

Selected range display Y5

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Connector C

Connector A

Selector mechanism Connector B

(selector lever E313)

672_031

Exchange of information between selector mechanism and gearbox control unit

Data is exchanged between the selector mechanism and the gearbox via the gateway.
The selector lever sensors control unit J587 communicates via the dash panel insert CAN;
the gearbox control unit J217 communicates via the FlexRay with the gateway (J533).

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8-speed automatic gearbox 0D5

The 8-speed automatic gearbox 0D5 is an enhanced version of the The versions of the 0D5 gearbox used in the Audi Q8 are similar to
8-speed automatic gearbox 0BK which was first used in the Audi the version fitted in the Audi A8 (type 4N) and have the following
A8 (type 4H) in 2010. features:
>> There is no longer an oil pump in the transfer box; refer to
The 0D5 gearbox made its début on the Audi Q7 (type 4M) in “Lubrication of transfer box” on page 31
2016. It has the internal Audi works designation AL552-8Q. The >> Dual angular contact ball bearings to minimise friction on
manufacturer, ZF-Getriebe GmbH, uses the designation 8HP65A. pinion shaft in front final drive
The 0D5 gearbox is rated for peak input torque of 700 Nm. >> Low-viscosity gear oil in front final drive; refer to “Oil systems/
lubrication” on page 30.
As previously, the gearbox software of the 0D5 gearbox uses the >> On vehicles which have a start/stop function but no MHEV
data from the navigation system; it assists e.g. the start/stop technology, gearboxes are equipped with a hydraulic pulse
function, stationary decoupling and coasting mode. accumulator (HPA).
The gearbox setup can be adjusted via Audi drive select in the usual >> On vehicles with MHEV technology, gearboxes are equipped
way; refer to page 34. with an auxiliary hydraulic pump 1 for gearbox oil V475.
>> Depending on the requirements of the specific markets, there
may be vehicles without start/stop function and without MHEV
technology. The gearboxes in these vehicles do not have an HPA
or an auxiliary hydraulic pump. This affects e.g. vehicles in
conjunction with the 183 kW V6 TDI engine CVMD.
Function diagram, exchange of information and data

The control unit of the 0D5 gearbox communicates with the vehicle
via the FlexRay data bus.
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P/N signal, start enable signal to J623

FlexRay - J533
FlexRay - J533
FlexRay - J500
FlexRay - J500

Earth connection N509

G93 ATF temperature sender

G182 Gearbox input speed sender
G195 Gearbox output speed sender
G510 Temperature sender in control unit
G747 Parking lock sender
J217 Automatic gearbox control unit
J500 Power steering control unit
J533 Data bus diagnostic interface
N88 Solenoid valve 1
N215 Pressure regulating valve 1, brake A
N216 Pressure regulating valve 2, brake B
672_032 N217 Pressure regulating valve 3, clutch C
N218 Pressure regulating valve 4, clutch D
Key:
N233 Pressure regulating valve 5, clutch E
Earth wire Output N371 Pressure regulating valve 6, torque converter lock-up clutch
Positive wire Input N443 Pressure regulating valve 7, system pressure
* N485 Accumulator solenoid (only on vehicles without MHEV
Signal wire
LIN bus technology in conjunction with HPA)
N486 Parking lock solenoid
N509 Gearbox oil cooling valve
** V475 Auxiliary hydraulic pump 1 for gearbox oil
(only on vehicles with MHEV technology)

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ATF supply unit

On all 0D5 gearboxes, ATF is supplied primarily via the mechani- On vehicles with MHEV technology, the electrically driven auxiliary
cally driven ATF pump. hydraulic pump 1 for gearbox oil V475 is fitted in place of the
On vehicles which have a start/stop function but no MHEV technol- hydraulic pulse accumulator. It assumes the task of the HPA and,
ogy, the gearbox is equipped with a hydraulic pulse accumulator additionally, performs the hydraulic supply for the gearbox when
(HPA). The HPA assists with the hydraulic supply for the gearbox in the engine is switched off in coasting mode. Refer to page 36.
start/stop mode.

Connector for N485

Breather
opening
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672_033

Pump drive hub meshes with torque

converter and rotates at engine speed

Hydraulic pulse accumulator (HPA),

with accumulator solenoid N485, on vehi-
cles with start/stop function. Accumulator solenoid Mechanically driven ATF pump Breather opening
SSP 457 contains detailed information on N485
the design and function of the HPA.

Auxiliary hydraulic pump 1 for gearbox oil

V475 (on vehicles with MHEV technology).
SSP 662 contains detailed information on
the design and function of the auxiliary
hydraulic pump.

672_034
Dual angular contact ball bearings

The connector for power supply to the auxiliary hydraulic

pump V475 is a clear identifying feature of gearboxes with
MHEV technology.

Reference
For detailed information on technology featured in the 8-speed automatic gearbox 0D5, please refer to SSP 457
“Audi A8 ´10 power transmission”, SSP 632 “Audi Q7 (type 4M)” and SSP 662 “Audi A8 (type 4N)”.
Information on mild hybrid electric vehicles (MHEVs) is available in the Service TV programme 0484 “Audi hybrid technology
– overview” and in SSP 664 “Audi A8 (type 4N) Electrics and electronics” on page 28 ff.

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Oil systems / lubrication

The 0D5 gearbox on the Audi Q8 has two or three separate oil systems, depending on the engine version.

3 oil systems
An 0D5 gearbox with three oil systems can be identified by the oil escape hole for the twin-lip oil seal on the front final drive.

ATF system for the planetary gearbox and the hydraulic Oil system for front final drive. The new low-viscosity gear
control unit. Does not have a fixed maintenance interval. oil does not have a fixed maintenance interval and must not
be mixed with the previously used gear oil. To prevent them
Oil system for the transfer box. The oil is supplemented from getting mixed up, the new gear oil has a red/violet
with STURACO1) and does not have a fixed maintenance colour.
interval.

Filler and inspection plug

1)
STURACO is an oil additive which reduces excessive
for front final drive
stresses in the centre differential and thus helps to
enhance ride comfort. Pay attention to exact assign-
ment of gear oils in accordance with the parts
numbers in the electronics parts catalogue (ETKA). Front final drive

ATF filler and

inspection plug

Filler and inspection plug for

transfer box
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672_035

Drain plug for front final drive

Drain plug for ATF drain plug Oil escape hole for twin-lip oil seal on Breather for transfer box
transfer box transfer box/front final drive

Collecting chamber ATF breather

Gearbox breather for 3 oil systems

Ventilation of the front final drive, the
transfer box and the ATF system is per-
formed via the collecting chamber. From
here, a breather pipe leads outwards
672_036
through the torque converter bellhousing;
refer to page 29, illustration 672_033.

When heating or cooling the gearbox,

pressure equalisation is performed via the
gearbox breather. To allow pressure equali-
sation to take place, the breather openings
must be open and unobstructed.
Oil escape hole for twin-lip
oil seal on planetary
gearbox/transfer box
Breather for front
final drive

!
Note
During transportation and when carrying out work on the gearbox, there is a risk that the gear oil and ATF may mix via the joint
gearbox vent if the gearbox is tilted too far. Follow the instructions given in the Workshop Manual.

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2 oil systems
An 0D5 gearbox with two oil systems can be identified by the lack
of an oil escape hole for the twin-lip oil seal on the front final
Side shaft housing tube
drive.

ATF system for the planetary gearbox and the hydraulic

control unit. Does not have a fixed maintenance interval.

Oil system for transfer box and front final drive. The oil is
supplemented with STURACO1) and does not
have a fixed maintenance interval.

The filler, inspection and drain plugs for both

oil system concepts are identical.

672_037

Oil reservoir No oil escape hole can be

seen in this location
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Lubrication of transfer box

None of the 0D5 gearboxes fitted in the Audi Q8 have a mechanical oil pump for
lubrication of the transfer box (as was the case on older 8-speed automatic
gearboxes). Lubrication of the transfer box now takes place without an oil pump,
via the gear wheels running in the oil pan. The oil reservoir shown in the illustra-
tion is filled with oil which sprays from the gear wheels; its function is to distrib-
ute the oil.

ATF breather
Gearbox breather for 2 oil systems
There is no breather passage from the front final drive to Breather opening,
see page 29, Fig. 672_033 Breather for transfer box
the collecting chamber on this gearbox version. The and front final drive
breather for the front final drive runs via the side shaft
Collecting chamber
housing tube; ventilation takes place via the breather for
the transfer box, which leads to the collecting chamber O-ring
(similarly to the breather for the ATF system).
From here, a breather pipe leads outwards
through the torque converter bellhousing.

672_038
Sealing collar

Breather pipe

Reference
Detailed information on working with the oil systems of the 8-speed automatic gearbox 0D5 is available in the Service TV
programme 0492 “8-speed automatic gearbox oil level and filling” dated 17.10.2017.

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ATF temperature regulation

Depending on the engine/gearbox combination (see page 22), the

temperature in the 0D5 gearboxes fitted in the Audi Q8 is regu-
lated in two different ways.

Single-circuit in combination with the following engines: Dual-circuit in combination with the following engine:
>> 3.0 ltr. TFSI engine, EA839 series >> 2.0 ltr. TFSI engine, EA888 gen. 3 series
>> 3.0 ltr. TDI engine, EA897 evo 2 series
>> 3.0 ltr. TDI engine, EA897 series On this engine, the ATF cooler is supplied with coolant via two
different coolant circuits. One circuit, which is controlled by the
On these engines, like on the Audi Q7 (type 4M), the ATF heat valve N509, runs in parallel with the large engine coolant circuit. A
exchanger is supplied with coolant by a circuit which is switched in second circuit, which is controlled by the valve N488, runs in
parallel with the large engine coolant circuit. The coolant circuit is parallel with the small engine coolant circuit.
controlled by the ATF heat exchanger via the valve N509.

Single-circuit ATF temperature regulation

Example: 3.0 ltr. TDI engine, engine code DHXA, EA897 evo 2 series

Engine warm-up phase (N509 closed) Heating up and cooling the ATF (N509 open)
During the engine warm-up phase, valve N509 is supplied with If the engine has reached its operating temperature and there is
current and is therefore closed. The ATF heat exchanger is not sufficient heat available for all requirements, valve N509 is
supplied with coolant. The coolant therefore does not lose any heat opened. The ATF heat exchanger is then supplied with warm
to the ATF, which means that the engine is quicker to reach its coolant from the large engine coolant circuit. The ATF is heated up
operating temperature. The thermal management system of the and its viscosity is reduced, which in turn improves the efficiency of
engine control unit decides when valve N509 should be reopened. the gearbox.
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The criteria for opening valve N509 are outside temperature, engine Heating of the ATF will continue for as long as the temperature of
temperature, ATF temperature, engine speed and the heat required the engine coolant is higher than than of the ATF. As soon as the
by the air conditioner. temperature of the ATF exceeds that of the engine coolant, it
starts to lose heat to the coolant and is cooled down.

ATF return line ATF supply line

N509

2 1

ATF heat exchanger 672_039

Gearbox oil cooling valve N509

ATF return line

1 ATF heat exchanger

672_040
ATF supply line

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Dual-circuit ATF temperature regulation

Example: 2.0 ltr. TFSI engine, engine code DMFA, EA888 gen. 3 series

ATF return line ATF supply line

N509
V51

ATF heat exchanger

Start-up phase
When the engine is cold started, valve N509 is supplied with
2
current and is therefore closed. Valve N488 is also closed. The ATF N488
heat exchanger is not supplied with coolant. The coolant therefore
does not lose any heat to the ATF, which means that the engine is
1 672_041
quicker to reach its operating temperature. The thermal manage-
ment system of the engine control unit determines when valves temperature, engine temperature, ATF temperature, engine speed
N509 and N488 should be actuated. Criteria for this are outside and the heat required by the air conditioner.

Heating the ATF Normal operation/cooling the ATF

If the engine has reached its operating temperature and there is In normal operation, valves N509 and N488 are not supplied with
sufficient heat available for all requirements, valve N488 is current. Valve N509 is open. Valve N488 is closed. The ATF heat
opened. The ATF heat exchanger is then supplied with warm exchanger is supplied with coolant which is maintained at a tem-
coolant from the small engine coolant circuit. In this way, the ATF perature between 80° C and 90° C. The ATF temperature
is heated up and its viscosity is reduced. This increases the effi- approaches the coolant temperature and is therefore in the speci-
ciency of the gearbox. Valve N509 remains closed during the fied range. If required, the coolant circuit is assisted by pump V51.
heating-up phase.
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1
Gearbox coolant valve N488

Gearbox 3
oil cooling
valve N509

ATF return line

ATF heat exchanger

N509 Gearbox oil cooling valve

>> Open when not supplied with current ATF supply line
>> Closed when supplied with current
>> Actuated by gearbox control unit J217. Gearbox control unit J217
receives the command to open or close valve J509 from the
672_042
thermal management system of the engine control unit. Continued coolant circulation pump V51

>> Final control diagnosis via Guided Fault Finding (address code 02)

N488 Gearbox coolant valve

>> Closed when not supplied with current V51 Continued coolant circulation pump
>> Open when supplied with current >> Actuated by the engine control unit. The thermal management
>> Actuated by the engine control unit. The thermal management system determines the switching status.
system determines the switching status. >> Final control diagnosis via Guided Fault Finding (address code
>> Final control diagnosis via Guided Fault Finding (address code 01) 01), coolant pump 2

!
Note
If there is a leak in the ATF cooler, coolant and therefore glycol will get into the ATF. Even very small amounts of coolant in the
ATF can have a detrimental effect on clutch control. A glycol test will show up even trace quantities of glycol and can therefore
be used to confirm or rule out a leak.

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Functions influencing gearbox control

Audi drive select

Audi drive select allows the driver to choose between different

vehicle configurations, i.e. modes. The Audi drive select modes
specified below can be selected via the Audi drive select button or
via the MMI.

In this chapter you will learn how the gearbox control system on
the Audi Q8 responds to the various Audi drive select modes.
Gearbox setups are tailored to the customer's requirements in a
way which varies from country to country. For this reason, only
typical differences between the various modes can be described
here. 672_043

The proportion of time spent driving in each Audi drive select mode As part of the Worldwide Harmonized Light-Duty Vehicles Test
can be read out using the vehicle diagnostic tester. Procedure (WLTP) - please refer to SSP 573 - when the ignition is
These times do not have any effect in terms of recognising the type switched off and then on again the vehicle is always restarted in
of driver and therefore do not permit any conclusions to be drawn the most recently selected Audi drive select mode and in transmis-
about the driver’s driving style. sion position D. The Audi drive select mode offroad is an exception
to this.

offroad allroad
In offroad mode the gearbox control system assists driving in The allroad mode does not have any effect on the gearbox setup.
rough terrain by using adapted functions.
Gear selection follows a fixed shift program without driver type
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recognition. Gears are shifted late, similarly to transmission

position S. Transmission position S is not available, but manual efficiency2)
shifting is possible in tiptronic mode (manual mode M). Transmission position E is displayed in the selector lever display
(E 1-8)1). Shift point selection follows a fixed shift program without
Automatic upshifting of the gearbox is deactivated in tiptronic driver type recognition, with upshifts being performed as early as
mode (M1-8)1). The engine revs up to the rpm limit without shift- possible and late downshifts with reduced engine power.
ing up. This prevents unwanted continuous up-and-down shifting.
This has a positive effect on fuel consumption and CO2 emissions.
The deactivation of automatic upshifting allows the engine to stop
on a hill at maximum revs. Even if traction is lost briefly, the gear is In efficiency mode, both the tiptronic functions and transmission
held to ensure that the full drive torque is available when the position S are available.
wheels regain full traction.
If the vehicle is equipped with an efficiency assist system, informa-
The deactivation of automatic upshifting allows the full braking tion is provided proactively via this system’s symbols to give the
effect of the engine to be utilised when driving downhill. To protect driver tips for a more efficient driving style.
the engine against over-revving, the gearbox shifts up before a
defined engine speed is reached.

If the ignition is switched off and then on again, vehicles with air
suspension are restarted in the Audi drive select mode allroad and comfort
in transmission position D. Vehicles with steel suspension are The gearbox control system operates in a similar way to auto
restarted in auto mode and in transmission position D. mode.

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auto dynamic
Shift point selection in transmission positions D and S is performed If dynamic mode is selected, the gearbox control unit activates the
according to the characteristic curves of the driver type recogni- sport program (transmission position S). In dynamic mode, it is
tion. possible to shift to D at any time.
To do this, the driver’s driving style is evaluated. The manner in
which the accelerator and brake pedals are operated and the
lateral and longitudinal acceleration occurring within defined time individual
frames are taken into account. In individual mode, the driver can freely select the gearbox setup
irrespective of other vehicle systems.
Accordingly, an efficient driving style leads to early upshifts and
late downshifts. A sporty driving style results in later upshifts and The menu item Drive system covers both the engine and the
earlier downshifts. gearbox. Via this menu item, the options efficient, balanced or
sporty can be selected.
Transmission position D, (D1-8)1) :
Shift point selection is performed with an emphasis on comfort, These options correspond to the Audi drive select modes as
while taking driver type recognition into account. follows:
>> Efficient corresponds to the Audi drive select mode efficiency
Transmission position S, (S1-8)1) : >> Balanced corresponds to the Audi drive select mode auto
In transmission position S, the gearbox control system is in the >> Sporty corresponds to the Audi drive select mode dynamic
sport program. Shift points are selected with an emphasis on a
sporty driving style, while taking driver type recognition into
account; they are adapted to the engine power range.
The shift times vary from normal (with barely perceptible shifts) to
short (with perceptible shifts).

If the vehicle is equipped with an efficiency assist system, no driver

information is provided via the efficiency assist’s symbols in the
sport program.
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1)
In the instrument cluster, the gears are shown next to the transmission positions D, E, S and M. In certain markets such as the USA and
Canada, no gear is shown in transmission positions D and E.

2)
The efficiency mode is not available on all vehicles. Availability depends on the engine/gearbox combination and on which specific
market the vehicles are configured for. This mode is not available in the USA and Canada, for example.

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Coasting mode

All versions of the 0D5 gearbox in the Audi Q8 support coasting The gearbox has five selector elements; the following ones serve
mode. On vehicles with Mild Hybrid Electric Vehicle (MHEV) tech- as separator elements:
nology, the auxiliary hydraulic pump 1 for gearbox oil V475 >> 8th gear: > 3000 rpm gearbox output speed: clutch D
enables the engine to be switched off. >> 8th gear: < 3000 rpm gearbox output speed: brake A
On vehicles without MHEV technology, the engine is not >> 7th, 6th, 5th and 4th gears: clutch D
switched off while in coasting mode; it must drive the >> 3rd and 2nd gears: clutch E
mechanically operated ATF pump so that the ATF supply >> 1st gear: clutch C
is maintained during coasting.
So that the gears can be preselected with the engine switched off,
Switching off the engine additionally saves fuel on vehicles with the auxiliary hydraulic pump 1 for gearbox oil V475 is required.
MHEV technology. However, certain circumstances may cause the V475 ensures the necessary ATF supply while the engine is
engine not to be switched off, such as: switched off. Refer to page 29.
>> If a defined engine temperature has not been reached
>> In the event of a corresponding request from the air conditioner There is a particular feature in 4th and 7th gears: If the vehicle is
>> If required by engine operation due to ESC regulation in one of these gears, the coasting function is activated if clutch D
>> During an adaption routine in the engine management system is opened.
>> During regeneration of the diesel particulate filter
However, when preselecting gears the 4th and 7th gears are
If the activation criteria described on the next page are fulfilled, skipped, as critical speeds may occur in the gearbox in these gears
the power flow between the engine and the gearbox is interrupted. if clutch D is opened.
In coasting mode the vehicle uses the available kinetic energy and
rolls along without any engine braking effect. Only transmission If, for example, the coasting function is activated in 8th gear and
position D or E is displayed in the gear indicator; the gears are not the vehicle slows down gradually, the vehicle remains in 8th gear
shown. until it is possible to shift to 6th gear. A similar procedure is
Depending on the speed at which the vehicle is travelling, the followed for 4th gear; the vehicle remains in 5th gear until it is
gears are preselected with the power flow interrupted. possible to shift to 3rd gear.
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!
Note
In coasting mode with the engine switched off, a delayed acceleration response may be noticed, as the engine may need to
be started before acceleration and the corresponding separator element may need to be closed.

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Activation criteria:
>> The intelligent coasting mode must be activated via the MMI >> Uphill gradient < 3%1) and downhill gradient < 4%1), the gradi-
display2). ent of the road is detected by the longitudinal acceleration
>> ESC must be active. sensor of the brake electronics.
>> Transmission position D or E must be selected. >> Activation by efficiency assist3) depending on the situation: If
>> Vehicle is travelling at a speed of between 55 km/h and 160 the vehicle is equipped with a navigation system4) and the
km/h1) optional adaptive cruise assist, the efficiency assist is able to
>> Overrun mode (accelerator pedal not applied) activate the coasting function to suit the situation if the cruise
control function is active. For this purpose, the efficiency assist
uses the route data from the navigation system and data from
the front camera.

Deactivation criteria:
>> Uphill or downhill gradient > 10%1) >> Deactivation by efficiency assist3) depending on the situation: If
>> Speed: the vehicle is equipped with a navigation system4) and the
>> > 170 km/h1) optional adaptive cruise assist, the efficiency assist is able to
>> < 8 km/h1) (if brake is not applied5)) deactivate the coasting function to suit the situation if the
>> Accelerator pedal applied cruise control function is activated.
>> Brake pedal applied: This takes place depending on the vehicle's speed, e.g. if the
>> > 30 km/h1) as soon as brake light switch is activated vehicle is approaching a built-up area or a roundabout. Coasting
>> < 30 km/h1) if a specified brake pressure threshold is mode is also deactivated when the vehicle is approaching other
exceeded road users.
>> ESC is deactivated. >> On vehicles with MHEV technology: in the event that no assist-
>> Transmission position S is selected. ance can be provided by the auxiliary hydraulic pump 1 for
>> Tiptronic mode is activated via the tiptronic gate or via the gearbox oil V475 due to overload protection or a fault.
tiptronic switch in the steering wheel.
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1)
The stated values are approximate and are provided without the accelerator as soon as there is a situation ahead which
obligation. They may vary depending on the vehicle version. requires a lower speed.
2)
On the MMI display, the efficiency assist with the “Intelligent 3)
The efficiency assist is a standard component of the engine
coasting” and “Predictive messages” functions can be selected management system.
under Car => Driver assist => Efficiency assist. These functions 4)
The navigation system is optional; it is not available in certain
can be activated or deactivated here. The intelligent coasting markets. If the vehicle is equipped with a navigation system,
mode is also available on vehicles without a navigation system. data relating to the route ahead are used. Also refer to “Naviga-
The efficiency assist determines, based on the situation, tion data-based gear selection”, SSP 457, page 58.
whether the coasting function is activated or whether recupera- 5)
If the brake is applied and the brake pressure is below a speci-
tion should take place via the starter-alternator in overrun fied threshold, the coasting mode remains active until the
mode. vehicle comes to a stop (0 km/h).
Predictive messages can only be provided with the assistance of
the navigation system. These messages are displayed in the
form of a symbol to instruct the driver to take his/her foot off

Reference
Information on mild hybrid electric vehicles (MHEVs) is available in the Service TV programme 0484
“Audi hybrid technology – overview” and in SSP 664 “Audi A8 (type 4N) Electrics and electronics” on page 28 ff.

37
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Start/stop function

To assist the start/stop function, the gearbox either needs a The hydraulic pulse accumulator or the auxiliary hydraulic pump 1
hydraulic pulse accumulator (HPA) or an auxiliary hydraulic pump 1 for gearbox oil V475 (on vehicles with MHEV technology) ensure
for gearbox oil V475. On vehicles with gearboxes which do not have that the Audi Q8 is ready to drive off quickly.
a hydraulic pulse accumulator or an auxiliary hydraulic pump 1 for
gearbox oil V475, the start/stop function is not available. If assistance ceases to be provided by the hydraulic pulse accumu-
Availability of the start/stop function therefore depends on the lator (HPA) or auxiliary hydraulic pump, the start/stop function is
engine/gearbox combinations offered in specific markets. deactivated and is no longer available.

The start/stop function is activated automatically every time the SSP 457 contains detailed information on the design and function
ignition is switched on. It helps to save fuel and reduce CO2 emis- of the HPA.
sions.
If the requirements for start/stop operation are fulfilled, the SSP 662 contains detailed information on the design and function
engine is switched off automatically if the brakes are applied and of the auxiliary hydraulic pump.
the vehicle’s speed drops below 22 km/h1). One of these require-
ments is that the selector lever is not in position R.

If necessary, the engine is switched on again automatically. The

requirements for this are a very short starting time and that the
vehicle must be ready to drive off quickly.

Neutral idle control

Irrespective of whether the HPA or the auxiliary hydraulic pump the neutral idle control function is activated as often as possible
V475 is fitted, all 0D5 gearboxes are able to perform neutral idle (see activation and deactivation criteria).
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control. However, the neutral idle control function is not available

in all markets. When driving off, the power flow is restored by closing the
clutches.
The neutral idle control function disengages the engine from the
gearbox when stopping and when the vehicle is stationary. This is
done by opening the corresponding clutches in the gearbox.

The engine idle torque can be reduced to a minimum because the

engine does not have to work against the converter torque.
This saves fuel and reduces CO2 emissions. In addition, the engine
runs more smoothly and quietly at low idle torque. For this reason,

Activation criteria: Deactivation criteria:

>> Full adaption of the shift elements (brakes, clutches) >> Transmission position S or tiptronic mode
>> ATF temperature > approx. 20°C1) >> Brake released (unless the vehicle is secured by the electro-
>> Gradient < 4%1) (the gradient is determined by the longitudinal mechanical parking brake or the hold assist function is active)
acceleration sensor of the brake electronics) >> Accelerator applied
>> Transmission position D or R >> On vehicles with hydraulic pulse accumulator (HPA), the clutch
>> Accelerator not applied control is coordinated with the HPA. If the HPA fails, the neutral
>> Brake pedal applied idle control function will be deactivated.
>> On vehicles with auxiliary hydraulic pump 1 for gearbox oil
V475, the clutch control is coordinated with the pump. If the
pump fails, the neutral idle control function will be deactivated.
>> Towing mode detected

1)
The stated values are approximate and are provided without obligation. They may vary depending on the vehicle version.

Reference
For further detailed information on the neutral idle control function in the 0D5 gearbox, please refer to self-study pro-
gramme 632 "Audi Q7 (type 4M)", page 52.

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Downhill speed control

The downhill speed control helps the driver to maintain a constant The downhill speed control function is deactivated again as soon as
speed when driving on downhill gradients. For this purpose, the the gradient lessens or the accelerator pedal is applied.
gearbox selects a gear which is suitable for the gradient so that the
speed selected when the brakes are applied can be maintained On appropriate gradients, the downhill speed control function is
using the engine braking effect. Depending on physical limitations, activated in transmission positions D and S if the brake pedal is
it may be necessary to additionally correct the vehicle's speed applied or if the cruise control system is activated.
using the brake pedal.

Special features of the steering wheel tiptronic function

>> After a long pull of the Tip- paddle lever, the gearbox changes For information on this function, refer to SSP 632 (page 47) and
down into the lowest possible gear. SSP 644 (page 61).
>> After a long pull of the Tip+ paddle lever, the gearbox switches >> The “Activation of coasting via Tip+” has been deactivated in
from temporary tiptronic mode to automatic mode. favour of a clearer function assignment for the steering wheel
>> If a system fault occurs in the selector mechanism, transmis- tiptronic function on the Audi A8. It is still possible to deacti-
sion positions P, R, N and D can be selected by simultaneously vate coasting with the – paddle lever however.
pulling both paddle levers, provided that the vehicle is station-
ary and the brake is applied.
>> The “tiptronic in D/S” function with which manual shifts can be
performed at any time is available.

Service
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Towing the vehicle

If a vehicle with an 0B5 gearbox needs towing, the usual restric- Reason:
tions for automatic gearboxes apply: When the engine is not running, the oil pump is not driven and
>> Activate the manual release mechanism for the parking lock certain parts of the gearbox are not lubricated. Failure to comply
>> Max. towing speed 50 km/h with the requirements for towing can therefore result in serious
>> Max. towing distance 50 km damage to the gearbox.
>> Do not tow the vehicle with the front or rear axle raised off the
ground

Gearbox warning/indicator lamps Diagnosis:

If the red gearbox warning lamp appears in the The electrical/electronic components as well as the control opera-
instrument cluster, the driver is instructed not to tions of the 0D5 gearbox are diagnosed. The diagnostic results can
drive any further. be called up via the address code 02 using the vehicle diagnostic
tester.

672_044

If the yellow gearbox indicator lamp appears in

the instrument cluster, it is generally possible to
continue driving the vehicle. A corresponding
driver message informs the driver of what to do.

672_045

!
Note
The downhill speed control function cannot overcome the physical limitations of the vehicle and therefore cannot maintain a
set speed in all conditions. The driver must always be ready to apply the brakes!

Reference
Note the other descriptions and notes on the topic of tow-starting and towing a trailer in the Owner's Manual.
For detailed and up-to-date information on the warning and indicator lamps, refer to the Owner's Manual.

39
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Running gear
Overview
The running gear on the Audi Q8 is based on the MLBevo platform, A further option is the all-wheel steering system which was intro-
which was also the basis for development of the Audi A4, A5, Q5, duced in the Audi Q7 (type 4M).
A6, A7, Q7 and A8. Due to the axle loads and vehicle dimensions,
the Audi Q8 uses major MLBevo system components from the Audi On comparable engine versions, the Audi Q8 is supplied with 18”
Q7 (type 4M). brakes rather than the 17” brakes fitted on the Audi Q7 (type 4M).
The basic specification is steel spring running gear with electronic The range of wheels extends from 18” in the basic specification
damping control. Adaptive air suspension and adaptive air suspen- through to optional 22” wheels.
sion sport are optionally available.
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672_046

The running gear for all Audi Q8 vehicles comes with the quattro drive system.
The following versions can be ordered:

Running gear versions Features

Running gear with steel suspension and damping control (1BL) This is the standard running gear.

Suspension with air springs and damping control This suspension system is optional. In auto mode, the ride height
(adaptive air suspension, 1BK) is approx. 15 mm lower than on the basic running gear version.

Sport suspension with air springs and adaptive damping This suspension system is optional. As the name suggests, the
(adaptive air suspension sport, 2MA) suspension is configured to suit a dynamic/sporty driving style.
The ride height is identical to adaptive air suspension (1BK).

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Axles
Front axle

The front axle is based on the proven design principle of the This was possible as the track width is the same on both models.
five-link suspension. The main system components are identical
parts to those on the Audi Q7 (type 4M).
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672_047

Rear axle

The Audi Q8 has a five-link rear axle. Like on the front axle, the The four-wheel steering system already used in the Audi Q7 (type
main system components are identical parts to those on the Audi 4M) is available as an option.
Q7 (type 4M).
The track width is also identical for both models.

672_048

Reference
For detailed information on the system components and the running gear setup, please refer to self-study programme 633
“Audi Q7 (type 4M) Chassis”.

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Adaptive air suspension

Air suspension with electronic damping control is optional for the The system components are carry-over features. The running gear
Audi Q8. The two versions, which are known as adaptive air suspen- control unit J775 is likewise fitted as a control centre.
sion and adaptive air suspension sport, differ primarily in terms of The control unit is taken over from the Audi A8 (type 4N). In terms
their internal construction, the shock absorber layout and the of design, operation and servicing requirements, the adaptive air
regulation of the damping forces. The control characteristics suspension system is identical to that used in the Audi Q7 (Type
(regulation of ride heights depending on vehicle speed and mode) 4M). The general way in which the system works is identical for
are identical on both versions. The systems have a similar layout to both models, although there are differences in the control charac-
the adaptive air suspension systems in the Audi Q7 (type 4M). teristics.

Running gear control unit J775

incorporating the control software
for the air suspension and damping
systems as well as sensors for
measuring vehicle dynamics

Air spring strut with damper

Front right shock absorber
damping adjustment valve
N337
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Front right
vehicle level sender
G289

Air spring strut with damper

Front left shock absorber
damping adjustment valve
N336

Front left vehicle

level sender
G78

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 < Back Forward > Ξ Contents

Rear right shock absorber damping

adjustment valve
N339
Air suspension

Air supply unit

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with compressor V66 and

solenoid valve block

Rear left shock

absorber damping
adjustment valve
N338

672_049

Air suspension

Rear left vehicle

level sender
G76

Rear right vehicle

level sender
Accumulator G77

Reference
For detailed information, please refer to self-study programme 633 “Audi Q7 (type 4M) Chassis.”

43
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Control characteristics of adaptive air suspension (1BK) and adaptive air suspension sport (2MA)

The same control strategy is used for both adaptive air suspension systems.

Control
Driving mode Ride height parameter
[mm]

lift High level 2

allroad/
offroad High level 1

comfort

auto Normal level

dynamic Low level

Motorway
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level

Lowered
rear end

Speed [km/h]

672_050

Key:

Selection lock

Hysteresis of selection lock

XXs = waiting time before control operation

The illustration shows the control strategy for the air suspension by a further 15 mm to motorway level. If the speed is subse-
systems. By selecting the preferred driving mode in Audi drive quently reduced again and the vehicle is driven at a speed between
select, the driver determines the vehicle’s ride height and dynamic 130 km/h and 35 km/h for a duration of 30 seconds, the ride
characteristics. At the same time, different ride heights are also height is raised by 15 mm to the ride height previously set. If the
automatically set within the selected driving mode, depending on speed is reduced to a value between 35 km/h and 10 km/h, the
the current vehicle speed. An example of this can be seen in the ride height is raised immediately by 15 mm. If the speed drops
control strategy in “auto” mode: If the vehicle is currently set to a below 10 km/h, the vehicle is raised again to the normal level
different ride height, the normal level is set by changing the specified for “auto” mode. In addition to comfort- and dynamics-
volume of air in the air springs if the mode is selected when the related advantages, the lowering of the ride height primarily aims
vehicle is stationary or travelling at a speed below 70 km/h. If the to improve aerodynamics and therefore to reduce fuel consump-
vehicle subsequently exceeds a speed of 70 km/h, the ride height tion.
will immediately be lowered by 25 mm.
If the speed then increases further to at least 160 km/h and
remains there for 20 seconds, the ride height will be lowered again

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Steering system
The steering system of the Audi Q8 implements the same electro- Manual adjustment for the steering column is included in the
mechanical power steering (EPS) used in the Audi Q7 (type 4M). standard equipment. An electrically adjustable steering column is
In terms of design, operation and servicing requirements, the EPS available as an optional extra. Both steering columns are taken
on the Audi Q8 corresponds to that used on the Audi Q7 (type 4M). from the Audi Q7 (Type 8M).
The steering ratio has been modified to suit the requirements
specific to the Audi Q8. On vehicles without four-wheel steering, a The horizontal adjustment range is approx. 68 Mm; the vertical
variable steering ratio (i = 14.6 in centre position) is implemented range is approx. 40 mm. As the Audi Q8 is not offered with a
by the progressive steering system fitted as standard (Audi Q7 type manual gearbox, an electronic steering column lock is only fitted in
4M: i = 15.8 at a constant ratio without progressive steering). On vehicles for markets with greater anti-theft protection require-
vehicles with four-wheel steering, the EPS from the Audi SQ7 (type ments (e.g. Sweden and Great Britain).
4M) is used with no change to the steering ratio (i = 13.3).
The optionally available four-wheel steering system has the same
design, function and operation as the Audi Q7 (type 4M); it is also
serviced in the same manner.
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672_051

Reference
For detailed information on components carried over from other models, refer to self-study programme 633 “Audi Q7 (type
4M) Chassis”.

45
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System components

Steering wheels
The available range comprises leather multifunction sports steer- All of the steering wheels offered as optional equipment feature
ing wheels which have a 3-spoke design and a total diameter of tiptronic levers. On the steering wheels with a rounded rim, steer-
375 mm. The vertical clip in the centre of the steering wheel is ing wheel heating is available as an option.
black on the basic version; on the optional steering wheels it
features a chrome look. The steering wheels are offered in three As S line equipment, steering wheels with a flat-bottomed rim are
different colours, depending on the interior specification. additionally available.

Steering wheel Equipment

Basic steering wheel version

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Optionally available steering wheel with tiptronic levers and vertical

clip featuring a chrome look

S line steering wheel with flat-bottomed rim and microdot

in grip area

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Brake system
The brake system on the Audi Q8 is based on the 18” brake system The brake calipers are also available in red. The components of the
used on the Audi Q7 (type 4M). As with the current A8, Q7, Q5 and brake system fitted on vehicles for the North American market may
A4 models, the brakes on the front and rear axles of the Audi Q8 vary from those specified in the overview due to national require-
have separate brake circuits (“black and white” system). ments.

Brake system

Engine Front axle Rear axle

2.0 ltr. TFSI (180 kW)
3.0 ltr. TFSI (250 kW)
3.0 ltr. TDI (170, 183, 210 kW)
Minimum wheel size 18" 18"

Type of brakes AKE fixed caliper brakes ZF TRW floating caliper brakes
PC 44 HE

Number of pistons 6 1

Piston diameter (mm) 30-36-38 44

Brake disc diameter 375 mm 350 mm

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Brake disc thickness 36 mm 28 mm

672_052 672_053

AKE fixed caliper brake used on the front axle TRW floating caliper brake used on the rear axle

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Brake servo
A size 9/9 tandem brake servo is used on the Audi Q8 in left-hand
and right-hand drive markets alike. The brake servo is taken over
from the Audi Q7 (type 4M).
On vehicles with 48 V electrical system (mild hybrid), a pedal travel
sensor is fitted instead of the brake light switch. This sensor’s
signal is used for regulating recuperation under braking.

672_054

Electromechanical parking brake (EPB)

The EPB on the Audi Q8 is likewise taken over from the
Audi Q7 (type 4M). Another similarity to this model is that the
control software is also located in the ABS control unit J104 on the
Audi Q8.
The controls and service requirements relevant to the EPB are
therefore identical on both models.
ProCarManuals.com

672_055

ESC
The ESP 9 already used on other Audi models is featured on the
Audi Q8. The brake pressure is generated by hydraulic pumps with
six pistons. On vehicles without radar sensor and laser scanner
(adaptive cruise assist), the initial brake pressure is measured by a
brake pressure sensor. On vehicles equipped with the adaptive
cruise assist system, two additional sensors measure the brake
pressure in both brake circuits. As a general rule, data are trans-
mitted via FlexRay. If the vehicles is only equipped with FlexRay
channel A, the ABS control unit J104 communicates via this
channel. On vehicles equipped with channels A and B, communica-
tion takes place via both channels.

672_056

Reference
For detailed information on the brake servo and EPB, please refer to self-study programme 633 “Audi Q7 (type 4M) Chassis”.

For detailed information on the design, function, operation, driver information and service requirements, please refer to SSP
633 “Audi Q7 (type 4M) Chassis” and SSP 663 “Audi A8 (type 4M) Chassis”.

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Wheels and tyres, tyre pressure monitoring

The Audi Q8 comes as standard with 19" forged aluminium wheels. The Tyre Pressure Loss Indicator is fitted as standard.
Wheels with size 20" to 22" are available as optional extras. The
available tyres range from 265/55 R19 to 285/40 R22. The 3rd generation Tyre Pressure Monitoring System (direct meas-
urement system) is available as optional equipment. The system
Run-flat tyres are not available. has the same construction and works in the same way as the
The Tyre Mobility System (TMS) is part of the standard equipment. system in the Audi Q7 (type 4M).
As on the Audi Q7 (type 4M), a temporary spare wheel (6.5Jx20 The aerial is integrated in the control unit, and the module is fitted
with 195/70 R20 tyre) is available as an optional extra. on the rear axle subframe, as on the Audi Q7 (type 4M).
A jack is included for vehicles with a temporary spare wheel or with
winter wheels ordered from the factory.

Basic wheel Optional wheels Winter wheels

Forged alumin. Cast aluminium Forged alumin.*

8.5Jx19 Flow form 8.5Jx19
265/55 R19 9Jx20 265/55 R19
275/50 R20

Cast aluminium Cast aluminium

Flow form Flow form*
10Jx21 8.5Jx20
285/45 R21 265/50 R20
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Cast aluminium Cast aluminium

Flow form Flow form
10Jx21 10Jx21
285/45 R21 285/45 R21

Cast aluminium
Flow form
10Jx21
285/45 R21

Cast aluminium
Flow form
10Jx21
285/45 R21

Cast aluminium
Flow form
10Jx22
285/40 R22

Forged alumin.
10Jx22
285/40 R22

* compatible with snow chains

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Electrics and electronics

48 Volt MHEV electrical system
The electrical system on the Q8 is similar to the system on the The Audi Q8 is a 48 Volt mild hybrid electric vehicle (48V MHEV).
Audi A8 (type 4N), although the fitting locations of the relay and Audi MHEVs are equipped, in addition to the traditional lead
fuse carriers and control units are more comparable to those on battery, with an additional lithium-ion battery and a starter-
the Audi Q7 (type 4M). alternator.

Battery, 12 V
Wiring junction TV66
A
Main battery wire, 12 V

Wiring junctions TV2 and TV3

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with jump-start terminal

Relay and fuse carrier SR1

in plenum chamber

48 Volt belt starter-

alternator C29

12 Volt pinion starter Relay and fuse carrier SR2

B at foot rest (left-side)

Wiring junction TV1

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The power for the drive train and the electrical energy are gener- The fitting locations of the batteries, the voltage converter, the
ated by the combustion engine. Fully electric driving is not possible 12 Volt pinion starter and the 48 Volt starter-alternator are, along
with the Audi Q8 MHEV. with their functions and layout, identical to the components in the
Audi A8 (type 4N).

Wiring junction TV67

Positive wire, 48 V

Battery, 48 V
A6
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672_057

Relay and fuse carrier SR4

on control unit rack in luggage com-
partment

Voltage converter, 48/12 V

A7

Fuse holder SF
on left of dash panel

Reference
For descriptions of the mild hybrid functions, refer to self-study programme 664 "Audi A8 (type 4N) Electrics and
electronics”.

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Networking
Fitting locations of control units

Some of the control units shown in this overview are optional and/ The control units listed here and those shown in the topology
or country-specific equipment. For reasons of clarity, not all section overleaf apply for the engines and equipment versions
control units fitted in the vehicle can be shown here. mentioned and described in this SSP.

J1089 J364 J387

A27

J794

J1122
J1122

J500 J844
J775 J234
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J242

J1121

J428
J764
J898 J285
J527

A31
J104 J623

J519

J1088
J1088
J386

A6 Battery, 48 V J364 Auxiliary heater control unit

A7 Voltage converter (48 V/12 V) J386 Driver door control unit
A27 Output module 1 for right LED headlight J387 Front passenger door control unit
A31 Output module 1 for left LED headlight J393 Convenience system central control unit
J428 Adaptive cruise control unit
E265 Operating and display unit for rear air conditioning J500 Power steering control unit
system J502 Tyre Pressure Monitoring System control unit
J505 Heated windscreen control unit
J104 ABS control unit J519 Onboard supply control unit
J136 Seat and steering column adjustment control unit with J521 Front passenger seat adjustment with memory control unit
memory J525 Digital sound package control unit
J234 Airbag control unit J527 Steering column electronics control unit
J245 Sliding sunroof adjustment control unit J533 Data bus diagnostic interface
J285 Control unit in dash panel insert
J345 Trailer detector control unit

Reference
Refer to the current service literature for details of control unit fitting locations, as well as instructions for installation and
removal.

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J927
R78 J880

J769

J505
J521
A6
J949

A7

J245 E265 J525

J772
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J533
J1019

J136

J853

J502

J605
J345
J770

J393
J926

672_058

J605 Rear lid control unit J927 Rear passenger side door control unit
J623 Engine control unit J949 Emergency call module control unit and communication
J764 Control unit for electronic steering column lock unit
J769 Lane change assist control unit J1019 Rear wheel steering control unit
J770 Lane change assist control unit 2 J1088 Front left radar sensor control unit for object detection
J772 Reversing camera system control unit J1089 Front right radar sensor control unit for object detection
J775 Running gear control unit J1121 Driver assist systems control unit
J794 Control unit 1 for information electronics J1122 Control unit for laser distance control
J844 Main beam assist control unit
J853 Control unit for night vision system R78 TV tuner
J880 Control unit for reducing agent metering system R242 Front camera for driver assist systems
J898 Windscreen projection system control unit
J926 Rear driver side door control unit

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Topology

J926 J386 J345

J927 J387 J605

N209 J136 J764 J453

N475 J245 A6

N210 J521 J367 A7

N477 C*

H12

J505 Convenience
system
central
control
G578 unit G65 Onboard A31
J393 power
supply con-
trol unit
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J391 J519 A27

J938 Control
motors 1-7

MX3 E265

MX4 Heater J866

controls 1-4

MX13 Control V388

motors V390
1-15

MX13 J126 V389

V391

J1169 J604 E1

J1170 G395 Background G397

lighting
1-15 G355

J897 Background J400

lighting
16-30

J1101 Background J1100

lighting
31-45

Key:

Convenience CAN Diagnostics CAN

Hybrid CAN FlexRay
Extended CAN Modular infotainment matrix CAN (MIB)
Infotainment CAN LIN bus
Sub-bus systems/private CAN USB wires
MOST bus Ethernet
LVDS Convenience CAN 2
Dash panel insert CAN Connect CAN

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R7 U41 R204

R293 R78

E67 J1060 J525

J1146 J685 Information J898

electronics
control unit 1
J794
J949 J285

J587

J1121

Data bus diagnostic interface

J533

Driver assist systems control unit J1088 J880

J1121

R242 J1089 J853

J794
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R243 J769 R212

EX22 R244 Ultrasonic J770 J772

sensors
1-12

EX23 R245 J1122 J502

J530 R246 J428 J104

Y7 J706 J234 J1019 J844

J528 J854 J855 J500 J364

J1097 J1098 J527 R64

G784 J623 J775 J1135

J583 J881 J217 V475

J1183 C29 V544

672_059

For presentation reasons, the FlexRay topology does not mirror the The order of the control units in the MOST ring in this illustration is
actual configuration of the control units. also not identical to the actual sequence.

* only on vehicles without an additional lithium-ion battery

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Key:

A6 Battery, 48 V J866 Control unit for electrically adjustable steering column

A7 Voltage converter (48 V/12 V) J880 Control unit for reducing agent metering system
A27 Output module 1 for right LED headlight J881 Control unit for NOX sender 2
A31 Output module 1 for left LED headlight J897 Control unit for air ionisation system
J898 Control unit for head-up display
C Alternator J926 Rear driver side door control unit
C29 Starter-alternator J927 Rear passenger side door control unit
J938 Rear lid power opening control unit
E1 Light switch J949 Emergency call module control unit and communication
E67 Driver side volume regulator unit
E265 Operating and display unit for rear air conditioning J1019 Rear wheel steering control unit
system J1060 Lower touch display
EX22 Centre switch module in dash panel J1088 Front left radar sensor control unit for object detection
EX23 Switch module 1 in centre console J1089 Front right radar sensor control unit for object detection
J1097 Control unit for rear left belt tensioner
G65 High-pressure sender J1098 Control unit for rear right belt tensioner
G355 Humidity sender J1100 Windscreen washer pump control unit
G395 Refrigerant pressure and temperature sender J1101 Control unit for fragrance diffuser system
G397 Rain and light sensor J1122 Control unit for laser distance control
G578 Anti-theft alarm sensor J1135 Adaptive suspension compressor electronics
G784 Particulate sensor J1146 Charging unit 1 for mobile devices
J1169 Near field communication control unit
H12 Alarm horn J1170 Near field communication control unit 2
J1183 Control unit for NOX sender 3
J104 ABS control unit
J126 Fresh air blower control unit MX3 Left tail light
J136 Seat and steering column adjustment control unit with MX4 Right tail light
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memory MX13 Centre tail light

J217 Automatic gearbox control unit
J234 Airbag control unit N209 Lumbar support adjustment valve block on driver side
J245 Sliding sunroof adjustment control unit N210 Lumbar support adjustment valve block on front passen-
J285 Control unit in dash panel insert ger side
J345 Trailer detector control unit N475 Valve block 1 in driver seat
J364 Auxiliary heater control unit N477 Valve block 1 in front passenger seat
J367 Battery monitor control unit
J386 Driver door control unit R7 DVD player
J387 Front passenger door control unit R64 Remote control receiver for auxiliary heater
J391 Rear fresh air blower control unit R78 TV tuner
J400 Wiper motor control unit R204 TV card reader
J428 Adaptive cruise control unit R212 Camera for night vision system
J453 Multifunction steering wheel control unit R242 Front camera for driver assist systems
J500 Power steering control unit R243 Front overhead view camera
J502 Tyre Pressure Monitoring System control unit R244 Left overhead view camera
J505 Heated windscreen control unit R245 Right overhead view camera
J521 Front passenger seat adjustment with memory control R246 Rear overhead view camera
unit R293 USB hub
J525 Digital sound package control unit
J527 Steering column electronics control unit U41 USB connection 1
J528 Roof electronics control unit
J530 Garage door operation control unit V388 Driver seat backrest fan
J583 Control unit for NOx sender V389 Front passenger seat backrest fan
J587 Selector lever sensors control unit V390 Driver seat cushion fan
J604 Auxiliary air heater control unit V391 Front passenger seat cushion fan
J605 Rear lid control unit V475 Auxiliary hydraulic pump 1 for gearbox oil
J623 Engine control unit V544 Radiator blind control motor
J685 MMI display
J706 Seat occupied recognition control unit Y7 Automatic anti-dazzle interior mirror
J764 Control unit for electronic steering column lock
J769 Lane change assist control unit
J770 Lane change assist control unit 2
J772 Reversing camera system control unit
J775 Running gear control unit
J844 Main beam assist control unit
J853 Control unit for night vision system
J854 Control unit for front left belt tensioner
J855 Control unit for front right belt tensioner

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Bus systems used on the Audi Q8

The bus systems used in the Audi Q8 are known from the Audi A8 which connects the emergency call module control unit and com-
(type 4M). The only new feature is the connect CAN, munication unit J949 to the gateway.

Bus systems Wire colour Configuration Data transfer rate

Connect CAN Electrical bus system 500 kbit/s

FlexRay
The FlexRay topology of the Audi Q8 is identical to that of the Audi The active steering control unit J792 and differential lock control
A8 (type 4N), with the exception of some differences in branch 3A unit J187 are not available in the Audi Q8.
and 8A.

J527 J533

94 Ω

94 Ω

J792

2,6 kΩ
Branch 8A
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J187

2,6 kΩ

J1121

2,6 kΩ

J1019

94 Ω

J775

672_061
2,6 kΩ

Branch 3A

J533

94 Ω
Key:
J527 Steering column electronics control unit
J533 Data bus diagnostic interface
J775 Running gear control unit
J1019 Rear wheel steering control unit
672_060 J1121 Driver assist systems control unit

Reference
For further information on bus systems, please refer to self-study programme 664 “Audi A8 (type 4N) Electrics and
electronics”.

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Exterior lighting
Headlights

LED headlights (PR No.: 8IT + 8G1/8G0)

Available as ECE1) and SAE2) version

The illustration shows the left headlight in the ECE1) version.

2
4 2
1
1
3
3
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672_062

Lighting functions:

>> Daytime running light (1) >> Main beam (3)

>> Marker light (1) >> All-weather light (4)
>> Dipped beam (2) >> Turn signal (1)
>> Side marker light (SAE only2), not illustrated)

Special features of the lighting functions Coming home/leaving home function

On the ECE1) version, the daytime running lights are dimmed to When it is dark, the entry/exit lighting illuminates the area around
marker light level when the turn signal is activated. the vehicle when the driver unlocks the vehicle and after the
On the SAE2) version, the daytime running lights are switched off ignition has been switched off and the driver’s door has been
during the turn signal procedure. opened. The entry/exit lighting only takes effect when it is dark
In the light phase of the turn signal the LEDs light up in yellow; in and when the light switch is in the AUTO position. The function
the dark phase the white LEDs of the marker light are active. activates the dipped beam, the marker lights and the tail lights.

Equipment Headlight range adjustment

The LED headlights can be combined with the main beam assist The LED headlights on the Audi Q8 are equipped with automatic
and a headlight washer system as options. dynamic headlight range adjustment.

Service Adjusting headlights for driving on other side of road

The control unit fitted on the outside of the headlight housing can It is not necessary to adjust the headlights. The legal requirements
be renewed in the event of a fault. In the event of damage to the are met without additional measures.
upper and inner headlight attachments, repair tabs can be
attached to the headlight housing.

1)
ECE = for the European market
2)
SAE = for the North American market

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HD matrix LED headlights (PR No.: 8IT + 8G5)

Available as ECE1) and SAE2) version

The illustration shows the left headlight in the ECE1) version.

2
3 2 1
4
1
1

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Lighting functions:

>> Daytime running light (1) >> Dipped beam (4)

>> Marker light (1) >> Intersection light (4)
>> Dipped beam (2) >> Motorway light
>> Main beam spot light (3) >> Cornering light
>> Matrix beam main beam (5) >> Intersection light (in combination with navigation system)
>> Dynamic turn signal (1) >> Side marker light (SAE only2), not illustrated)
>> All-weather light (4)

Special features of the lighting functions Coming home/leaving home function

On the ECE1) version, the daytime running lights are dimmed to On Audi Q8 vehicles with HD matrix LED headlights, the entry/exit
marker light level when the turn signal is activated. lighting involves the dipped beam being switched on as well as
On the SAE2) version, the daytime running lights are switched off dynamic activation of the marker lights and the tail lights, with the
during the turn signal procedure. In the light phase of the turn marker light and tail light LEDs being activated at different
signal the LEDs light up in yellow; in the dark phase the white LEDs moments.
of the marker light are active.
Headlight range adjustment
Equipment The HD matrix LED headlights are equipped with automatic
The Audi Q8 with HD matrix LED headlights is fitted with a head- dynamic headlight range adjustment.
light washer system as standard.
Adjusting headlights for driving on other side of road
Service It is not necessary to adjust the headlights. The legal requirements
The control unit fitted on the outside of the headlight housing can are met without additional measures.
be renewed in the event of a fault. In the event of damage to the
upper and inner headlight attachments, repair tabs can be
attached to the headlight housings.

Reference
For information on headlight activation and calibration of the HD matrix LED headlights, please refer to self-study pro-
gramme 670 “Audi A6 (type 4A)”.

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Tail lights
General description
The tail lights on the Audi Q8 are in three sections; one tail light LEDs are used for all light functions. The tail lights are activated via
each on the left and right sides and a light unit which covers the the convenience system central control unit J393.
entire width of the boot lid.

Left tail light Centre rear tail light unit

MX3 MX13

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Right tail light

MX4
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Versions

The tail lights appear in the three following versions:

>> LED tail lights: PR No. 8SK (ECE1) only)
>> LED tail lights with sequential turn signals: PR No. 8SP (SAE2) only)
>> LED tail lights with sequential turn signals and dynamic tail lights: PR No. 8SQ (ECE1) and SAE2))

1)
ECE = for the European market
2)
SAE = for the North American market

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High-level brake light

On the Audi Q8, the high-level brake light is integrated in the rear In the event of a fault, the high-level brake light must be renewed
spoiler. It is not possible to renew individual LEDs. as a complete unit after the rear spoiler has been removed.
ProCarManuals.com

672_065

High-level brake light bulb

M25

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Convenience electronics
Overview
With regard to its electrical system, the Audi Q8 is based on the second generation of the MLBevo platform. Many convenience-related
items have been taken over in unchanged form from other vehicles which are based on this platform. However, modifications were neces-
sary for the Audi Q8 in various convenience-related areas.

The list of items below provides an overview of the various conven-

ience-related equipment on the Audi Q8.

Central locking Seats

On the Audi Q8, the following ways of locking/unlocking the There are different types of front seat:
vehicle using the central locking system are possible: >> The available seats are the basic seat, sports seat and individual
>> Using the vehicle key contour seat. The front seats can be ordered with electrical
>> Via sensors in all four door handles adjustment, seat ventilation, massage function and memory
>> Using the lock cylinder on the driver’s door function as options. The rear seats can only be adjusted manu-
>> Using the central locking switch inside the vehicle ally in the longitudinal direction and the seat rake of the back-
>> Using the Audi connect key or Audi connect key card rest can be adjusted.

Rear lid operation Garage door opener

>> The rear lid can be opened and closed electrically. In combina- >> Up to eight systems (e.g. garage doors, property gates, exterior
tion with the convenience key, the rear lid can be opened and and interior lighting, alarm systems) can now be programmed
closed via sensors by using a kicking movement (“foot on the optional garage door opener. The customer can also
gesture”). operate the various systems more conveniently using a GPS link.

Steering wheel
ProCarManuals.com

>> The Audi Q8 comes with a multifunction steering wheel as

standard. Steering wheel adjustment is performed manually;
the customer can order electric steering column adjustment as
Multifunction steering wheel
an option.

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Front passenger exterior door handle

contact sensor
G416

Front seat (S sports seat in illustration)

Reference
For further information, please refer to self-study programme 664 "Audi A8 (type 4N) Electrics and electronics”.

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Rear view mirrors

Exterior mirror

The Audi Q8 comes as standard with electrically adjustable and heated exterior mirrors with an electric folding function. The driver can also
choose to have the mirrors folded in automatically when locking the vehicle.

Optional functions of exterior mirrors:

Exterior mirror
>> Automatic anti-dazzle
>> Tilting function for exterior mirror on passenger side: When
reverse gear is selected, the exterior mirror glass on the pas-
senger side is tilted downwards automatically so that the driver
has a view of the kerb and the wheel in proximity to the kerb.
The mirror returns from this position into the original position
under the following circumstances:
>> If the ignition is switched off (= terminal 15 OFF)
>> As soon as the car is driven forwards at a speed of over
15 km/h
>> If the rotary knob is no longer in the “front passenger exte-
rior mirror adjustment” position

Exterior mirror heating:

>> To heat up the exterior mirrors, the mirror selection switch
must be set for heater activation.

Temperature characteristics for exterior mirror heating:

>> If the outside temperature is below +5 °C, the exterior mirrors
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are supplied with full heating power for approx. three minutes.
>> If the outside temperature is above +5 °C, the exterior mirrors
are supplied with full heating power for approx. two minutes. 672_067
Following this short use of full heating power, heating of the
exterior mirrors continues depending on the speed of the Rotary knob for exterior
vehicle and the outside temperature: mirror
>> If the weather is dry, the mirror surface is heated to approx.
+20 °C
>> If if is raining, the mirror surface is heated to approx. +30 °C

When servicing the vehicle, it must be noted that the mirror

surface temperatures cannot be measured reliably.
This is due to the technical structure of the exterior mirrors and
the temperature tolerances which may occur for all heated sur-
faces under certain ambient conditions.
The specified temperatures may vary from model to model and on
country-specific versions.

Frameless interior mirror

The Audi Q8 features the frameless automatic anti-dazzle mirror.

This protects the driver from being dazzled by the headlights of
following vehicles thanks to the automatic anti-dazzle function.

The light from the headlight beams of vehicles behind is detected

with the help of a photo cell, upon which the interior mirror is
dimmed automatically.
For the North American market, the frameless interior mirror also
has a compass display in the mirror glass.

If the interior lighting is switched on or reverse gear is engaged,

the automatic anti-dazzle mirror is not dimmed. Light sensor
672_068
G399
Automatic anti-dazzle
interior mirror
Y7

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MOST bus
The sequence of control units in the MOST bus is the same as the On the Audi Q8, too, the head-up display J898 is a node of both the
sequence familiar from the Audi A6, A7 and A8. Whether the five dash panel insert CAN and the MOST data bus.
control units in the illustration are actually connected to the MOST By connecting the head-up display to the optical data bus, it is
bus depends on the equipment fitted on the vehicle in question. possible to visualise the detailed intersection map for the driver in
For example, if an Audi Q8 does not have a TV tuner the corre- the head-up display as well.
sponding control unit does not participate in the MOST bus.

Order of MOST bus ring nodes

Control unit for Digital sound package

head-up display control unit
J898 J525

TV tuner
R78
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Control unit 1 for Control unit in

information electronics dash panel insert
J794 J285

672_069

Key:

Infotainment CAN
Dash panel insert CAN
MOST bus

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Interior lighting
The Audi Q8 is fitted with the interior lighting with PR number QQ0 The glove compartment light and the footwell and luggage com-
as part of the standard equipment. This comprises two LED roof partment lights also feature LED technology.
modules with capacity-controlled reading lights.
LEDs are also used for the two make-up lights and on the entry
lights and interior door handle lights.

Standard equipment Background lighting Contour/background

QQ0 package QQ1 lighting package QQ2

LED roof module,

front/rear, (capacity-controlled) (capacity-controlled) (capacity-controlled)
incl. reading lights

Contour lighting for

front/rear doors RGB

Background door
lighting, RGB
front/rear

Surround lighting from

exterior door handles,
front/rear

Make-up lights
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Entry lights,
front/rear

Interior door handle,

front/rear

Door warning lamps

passive passive passive

Illuminated sill panel

trim front/rear via equipment lines and as individual option

Contour lighting for

front centre console RGB

Background lighting for

front centre console RGB

quattro badge or Audi

rings incl.
contour line on RGB
passenger side

Background lighting
for dash panel RGB

Glove box light

Footwell lighting,
front/rear

Luggage compartment
light, right/left

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Convenience system central control unit J393

Brief description of J393 (BCM2): Further integrated functions:
>> Has diagnostic address 0046 >> Central locking
>> Node of convenience CAN data bus >> Anti-theft alarm system
>> Has the following master functions: >> Activation of rear exterior lighting
>> Central locking system master >> Heated rear window
>> Immobiliser master >> Turn signal control
>> LIN master for: >> Rear lid release and luggage compartment lighting control
>> LIN1: Heated windscreen control unit J505, anti-theft alarm >> Tank filler flap locking
sensor G578 >> Power latching system for rear lid
>> LIN2: Alarm horn H12 >> Activation of sliding sunroof
>> LIN3: Rear lid power opening control unit J938, >> Activation of sunroof sun blind
tail lights >> Electronic steering column lock
>> Has master function for both near field communication control >> Sensor-operated rear lid opening
units: >> Tank sensor management
>> Near field communication control unit J1169 >> Automatic activation of hazard warning lights and unlocking of
>> Near field communication control unit 2 J1170 doors in an accident in which the crash sensor is activated
>> Terminal management
>> Entry and start authorisation

The HF device connection is not used on the Audi Q8/nothing is

connected to it.

J393 is the immobiliser master in the Audi Q8; address code 05 is

no longer used for the immobiliser.
The central locking aerial is integrated in the control unit printed
circuit.
ProCarManuals.com

The convenience system central control

unit J393 is fitted with the electrical con-
nectors facing downwards.

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Fitting location:
Convenience system central control unit
J393

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Instrument clusters
The Audi Q8 features exactly the same instrument clusters as the As well as being connected to the MOST bus, the Audi virtual cockpit
Audi A6 (type 4A). also has an LVDS wire. This wire creates a direct connection between
The analogue instrument cluster is a node of the dash panel insert control unit 1 for information electronics J794 and control unit in
CAN and the MOST bus. If Q8 vehicles are equipped with an ana- dash panel insert J285. The large navigation map and the detailed
logue instrument cluster but do not have adaptive cruise control or intersection maps are transmitted via this connection.
night vision assist, there is no connection from the MOST bus to
the instrument cluster on these vehicles.

Information line at top, displayed as tabs

Central area of driver information system,

for displaying content of tabs
Status line, e.g. with mileage,
shown on one or two lines

Analogue instrument cluster 672_071

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Standard view with large

displays for speedometer
and rev counter

Audi virtual cockpit 672_072

Control unit 1 for Control unit for

information electronics head-up display
J794 J898

Control unit in dash

panel insert
J285

Selector lever sen-

sors control unit
J587

672_073

Key:

Infotainment CAN LVDS

Dash panel insert CAN Modular infotainment matrix CAN (MIB)
MOST bus Ethernet

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Air conditioning
The new technical features which were introduced with the Audi A8 In addition to the newly introduced fragrance diffuser and
(type 4N) are continued in the Audi Q8. This self-study programme air ionisation system, the Audi Q8 has a 2-zone, a 3-zone and a
will give you an overview of the air conditioning systems in the 4-zone air conditioner. Depending on the equipment version,
Audi Q8. Detailed information on fitting locations and functions different operating units may be used in the rear cabin.
along with images can be found in self-study programme 665;
Audi A8 (type 4N) “New features of the air conditioning system and
introduction of refrigerant R744”.

Overview
Fragrance diffuser system

As with the Audi A8 (type 4N), the fragrance diffuser system with A small blower guides the fragrance from the vial into the front air
two different fragrance types is offered for the Audi Q8. The outlets at the side via small air hoses. In addition to the fragrance
fragrances are kept in cylindrical vials in the function unit for type, four levels of intensity can be selected.
fragrance diffuser system GX43.

Air ionisation system

An air ionisation system is used in the Audi Q8 to improve the air

quality. The system works by negatively charging a limited number
of air particles. The charged air particles are distributed in the
vehicle interior via the front air outlets at the side.
ProCarManuals.com

These anions neutralise the dust and similar very small particles
that they attract.

Back massage

A back massage function is offered for the front seats of the Audi Q8.

The following massage programmes can be activated:

>> Wave >> Shoulder
>> Pulse >> Activation
>> Stretch >> Revitalisation
>> Rest

Air conditioner controls in the front

Similarly to the Audi A8 (type 4N), there is no longer a Climatronic

control unit J255 on the Audi Q8, which means that a separate air
Car A/C
conditioner control unit is no longer fitted. The air conditioner
controls are now integrated in the onboard supply control
unit J519. The communication between the onboard supply control
unit J519 and the air conditioner components involved is achieved
via the LIN bus system. As in the Audi A8 (type 4N), the system is
operated via two touch displays. The upper MMI display and the
lower touch display are both fitted centrally in the dash panel and
the centre console. The air conditioner functions in the top MMI
display can also be accessed via the car menu.
672_074

Depending on the equipment fitted, the MMI display can be used to select the following functions and their settings:
>> Ionisation >> Air conditioning for rear passengers/for rear
>> Perfume >> Auxiliary air conditioning
>> Steering wheel heating >> Air conditioning (A/C MAX, A/C OFF, A/C eco)
>> Synchronisation for driver/passenger side

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Air conditioner controls in the rear

Depending on the equipment version, two different operating units may be available in the rear.
>> 2-zone air conditioning:
>> No rear operating unit (only a knurled wheel to open and
close the vents)
>> 3-zone air conditioning:
>> Rear operating unit with digital temperature display and
buttons for seat heating
>> 4-zone air conditioning:
>> Rear touch operating unit including air conditioner regula-
tion and seat heating, permanently fitted in the centre
console

3-zone air conditioning

The operating and display unit for rear air conditioning
system E265 is fitted as the operating unit in the rear of the
vehicle. The seat heating can be set on this operating unit in
addition to the temperature.

672_075

4-zone air conditioning

The optional operating and display unit for rear air conditioning
system E265 is equipped with a sensory surface.
It can therefore be operated by touch.
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The following settings can be made:

>> Temperature >> Automatic A/C
>> Blower speed >> A/C on/off
>> Air distribution >> Seat heating
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Safety and driver assist systems

Overview Passenger airbag

Passive safety

On the following pages you will find a summary of the occupant

protection system in the Audi Q8.

Driver airbag
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Front side airbag

Components

Depending on country version and vehicle equipment, the passive occupant and pedestrian protection system in the Audi Q8 may
include the following components and systems:
>> Airbag control unit >> Belt retractors for seat row 2 with pyrotechnic belt tensioners for
>> Adaptive driver airbag driver and passenger side
>> Adaptive passenger airbag (two-stage passenger airbag) >> Belt retractors for seat row 2 with electric belt tensioners for
>> Front side airbags driver and passenger side
>> Side airbags for seat row 2 >> Front lap belt tensioners for driver and passenger sides
>> Curtain airbags >> Seat belt warning for all seats
>> Crash sensors for front airbags >> Seat-occupied recognition system in passenger seat
>> Crash sensors for side impact detection in doors >> Seat-occupied recognition system for seat row 2
>> Crash sensors for side impact detection in C-pillars >> Key-operated switch to deactivate airbag on front passenger side
>> Crash sensors for side impact detection in B-pillars >> Front passenger airbag warning lamp (OFF and ON)
>> Front belt retractors with pyrotechnic belt tensioners >> Seat position detection for driver and passenger
>> Front belt retractors with electric belt tensioners >> Battery isolator, 12 Volt electrical system
>> Front belt retractors with switchable belt force limiters >> Battery isolator, 48 Volt sub-system

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Front side airbag

Curtain airbag for driver and passenger side

Side airbag for seat row 2

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672_077

Side airbag for seat row 2

!
Note
The images in the chapter on safety are schematic diagrams and are provided to aid understanding.

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System overview
The system overview shows components which depend on the market and the
vehicle equipment.

G283 G284

J285/K75/K19
J519 J528
K145

E224

T16

N131 N132 N491

N490 N95

J234
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G1281)
G553 G554
J7061)
G179 G180

G1282)

N199 J533 N200

N297 N298

E24 E25

G1101 G1102

J854 J855
N153 N154

N251 N252
G551 G552

G1010

G177 G178

N201 N202
F390 F391 F392
G256 G257

J1097 J1098
N196 N197

N253 N751
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Key:

Diagnostics CAN FlexRay Input signal

Dash panel insert CAN LIN bus Output signal
Sub-bus system/private CAN Convenience CAN 2

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Additional equipment

Equipment may vary due to the different demands and legal requirements that are made of vehicle manufacturers in the markets.

Key to figure on page 70:

E24 Driver side belt switch K19 Seat belt warning system warning lamp
E25 Front passenger side belt switch K75 Airbag warning lamp
E224 Key operated switch to deactivate airbag on front pas- K145 Warning lamp for airbag deactivated on front passenger
senger side side (both ON and OFF status of passenger airbag is indi-
cated)
F390 Belt switch for seat row 2, driver side
F391 Belt switch for seat row 2, middle N95 Airbag igniter on driver side
F392 Belt switch for seat row 2, passenger side N131 Airbag igniter 1 on front passenger side
N132 Airbag igniter 2 on front passenger side
G128 Seat occupied sensor, front passenger side N153 Driver seat belt tensioner igniter 1
G177 Rear seat occupied sensor on driver side N154 Front passenger seat belt tensioner igniter 1
G178 Rear seat occupied sensor on passenger side N196 Rear belt tensioner igniter on driver side
G179 Side airbag crash sensor on driver side N197 Rear belt tensioner igniter on passenger side
G180 Side airbag crash sensor on front passenger side N199 Side airbag igniter on driver side
G256 Rear side airbag crash sensor on driver side N200 Side airbag igniter on front passenger side
G257 Rear side airbag crash sensor on passenger side N201 Rear side airbag igniter on driver side
G283 Front airbag crash sensor for driver side N202 Rear side airbag igniter on passenger side
G284 Front airbag crash sensor for front passenger side N251 Driver side curtain airbag igniter
G551 Driver side belt force limiter N252 Front passenger side curtain airbag igniter
G552 Front passenger side belt force limiter N253 Battery isolation igniter
G553 Driver side seat position sensor N297 Igniter for driver side seat belt tensioner 2 (lap belt ten-
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G554 Front passenger side seat position sensor sioner)

G1010 Rear seat occupied sensor, centre N297 Igniter for front passenger side seat belt tensioner 2 (lap
G1101 Crash sensor for side airbag in B-pillar, driver side belt tensioner)
G1102 Crash sensor for side airbag in B-pillar, passenger side N490 Igniter for exhaust valve for driver airbag
N491 Igniter for exhaust valve for front passenger airbag
J234 Airbag control unit N751 Battery isolation igniter, 48 V
J285 Control unit in dash panel insert
J519 Onboard supply control unit T16 16-pin connector, diagnostic connection
J528 Roof electronics control unit
J533 Data bus diagnostic interface (gateway)
J706 Seat occupied recognition control unit
J854 Control unit for front left belt tensioner
J855 Control unit for front right belt tensioner
J1097 Control unit for rear left belt tensioner
J1098 Control unit for rear right belt tensioner

Connection for seat occupied sensor, front passenger side G128

The connection for the seat occupied sensor, front passenger
side G128 varies depending on market version.

1)
Vehicles for the North American region (NAR): 2)
Vehicles for rest of world (ROW):
The seat occupied sensor, front passenger side G128 is con- The seat occupied sensor, front passenger side G128 is con-
nected to the seat occupied recognition control unit J706 via a nected directly to the airbag control unit J234 via a discrete wire.
discrete wire. The control unit communicates with the A seat occupied recognition control unit J706 is not fitted.
airbag control unit J234 via a LIN bus wire.

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Airbag control unit J234

The airbag control unit J234 fitted in the Audi Q8 is based on the
same control unit generation used in the Audi A8 (type 4N). The
features and the setup of the airbag control unit J234 have been
adapted to suit the Audi Q8. For details of the equipment specifi-
cation, refer to the system overview on page 72.

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Active safety

Audi pre sense

With regard to Audi pre sense, the Audi Q8 is based on the Audi A8
(type 4N). The system components and specifications have been
adapted to suit the Audi Q8.

Depending on the vehicle equipment, the Audi Q8 may feature the Note
following Audi pre sense functions: At the time of publication of the self-study programme, a final
>> Audi pre sense basic decision had not been made as to whether the “Audi pre sense
>> Audi pre sense rear side” function would be available for the Audi Q8 from week
>> Audi pre sense side 27/2018 onwards or at a later date. In this regard, note the PR
>> Audi pre sense front numbers in the vehicle. Audi pre sense side is available with PR
>> Audi pre sense swerve assist numbers JX1+7Y1.
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>> Audi pre sense turn-off assist

672_080

Reference
For further information on the airbag control unit J234 and Audi pre sense, please refer to self-study programme 662
“Audi A8 (type 4N)”.

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Side crash sensors

The Audi Q8 is equipped with a total of six external crash sensors The signals from these crash sensors are used to determine the
for detecting side collisions (in the Y direction): two pressure severity of the accident and as a plausibility check for side impacts.
sensors and four acceleration sensors.

The designations for the side crash sensors are as follows:

>> G179 Side airbag crash sensor on driver side >> G257 Rear side airbag crash sensor on passenger side
(pressure sensor in the door) (acceleration sensor on the C-pillar)
>> G180 Side airbag crash sensor on front passenger side >> G1101 Crash sensor for side airbag in B-pillar, driver side
(pressure sensor in the door) (acceleration sensor on the B-pillar)
>> G256 Rear side airbag crash sensor on driver side >> G1102 Crash sensor for side airbag in B-pillar, passenger side
(acceleration sensor on the C-pillar) (acceleration sensor on the B-pillar)

For details of vehicle equipment related to occupant protection,

please also refer to the system overview on page 72.
ProCarManuals.com

672_081

G179 Side airbag G1101 Crash sensor G256 Rear side airbag
crash sensor on for side airbag in crash sensor on
driver side B-pillar, driver side driver side

Pressure sensor in the door 672_082 Acceleration sensor on 672_083

C- and B-pillars

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Camera-based trailer assist

Challenges faced when reversing with a trailer attached

Driving a vehicle in reverse gear with a trailer attached is a major Without the help of a suitable driver assist system, the trailer
challenge for many drivers. This does not only apply to drivers who often becomes unstable during reversing manoeuvres; its align-
have little or no experience with reversing a vehicle with a trailer ment constantly has to be corrected. The necessary steering
attached. Different local conditions, limited visibility when revers- direction is anything but intuitive. Steering errors can quickly result
ing and the use of different trailers with different handling charac- in material damage.
teristics are factors which mean that the driver is constantly faced
with new challenges.

The two different trailer assist versions

Version 1
To make it easier for the driver to deal with the challenges
described, Audi developed a trailer assist system, the first version
of which was introduced in the Audi Q7 (type 4M) in 2015. On this
version, the measurement principle for recording the current
articulation angle ß between the vehicle and the trailer is based on
an articulation angle sensor. This sensor is located in the ball
coupling of the towing bracket and operates on the basis of a Hall
sensor. 672_084

Articulation angle sensor G820

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Articulation angle ß between longitudinal axes of vehicle and trailer 672_085

Version 2
The camera-based trailer assist system is being used for the first reversing camera or the rear camera of the surround view camera
time on the Audi Q8 in 2018. It is the second version of the trailer system. In this case, the articulation angle ß is recorded by an
assist and works on the basis of a camera. This may either be the image processing software on the basis of the camera images.

Reference
For more detailed information on the first version of the trailer assist system, please refer to self-study programme 636
“Audi Q7 (type 4M) – Trailer assist”.

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Differences between the two versions

Trailer assist system based on Camera-based

an articulation angle sensor trailer assist

First used on Audi Q7 (type 4M) in 2015 Audi Q8 in 2018

Recording of current Articulation angle sensor in ball coupling Images from reversing camera or from
articulation angle using... of towing bracket rear camera of surround view camera
system
Adjustment of specified MMI rotary pushbutton Swiping movements on touch display
articulation angle using...
Large image of trailer assist on May be a camera image or a picture Is always a camera image
left of MMI display...

Rear carrier detection available Yes No

Function of camera-based trailer assist

The trailer assist is only available to the driver if a the trailer

detector control unit J345 currently detects a trailer. It is possible
to activate the trailer assist if the vehicle is travelling forwards at a
speed of between 0 km/h and 10 km/h. The system is activated via
a virtual button in the lower touch display. If the trailer assist is
activated, this can be seen via a red bar in the virtual button
underneath the function’s symbol.
672_086
ProCarManuals.com

While the trailer assist is active, the vehicle is steered by the The exact value depends on the current articulation angle and lies
system if the vehicle and trailer are driving in reverse. The system in the range between 3 km/h and 8 km/h. The smaller the articula-
takes over the steering when the driver engages reverse gear while tion angle is, the greater the speed permitted for the vehicle and
the vehicle is stationary. From this point, the driver can let go of trailer. The reversing speed is limited by a drive train coordination
the steering wheel. If the system detects that the driver’s hands program in the engine control unit. This coordinates the speed
are on the steering wheel, the trailer assist is deactivated. The requirements of various systems and prioritises these accordingly.
driver remains in charge of braking, accelerating and changing
gears, a principle which is already familiar from the park assist The alignment of the vehicle with the trailer and the path it will
system. However, when driving forwards with the trailer attached continue to follow when reversing are specified by the driver by
the driver must always steer the vehicle himself/herself. adjusting the specified articulation angle on the MMI display.
When reversing, the driver therefore retains control not with the
When driving in reverse gear with the trailer assist activated, the steering wheel but with the articulation angle he/she has speci-
vehicle’s speed is limited to a maximum value. fied.

!
Note
The trailer assist is a driver assist system which helps the driver when reversing the vehicle with a trailer attached. However,
the driver still retains full responsibility for moving the vehicle with a trailer attached. In particular, the driver must ensure
that no obstacles or hazards are in the vehicle’s path.

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Displays and operation

Activating the trailer assist

The trailer assist is activated via a virtual button in the lower touch The steering wheel symbol represents the fact that the system
display. This button features an image of a trailer with a steering takes over the steering while the vehicle is in reverse gear.
wheel symbol.

The virtual button of the trailer assist only appears on the lower touch display if the two following requirements are met:
>> The electrically swivelling towing bracket from Audi must be >> The trailer detector control unit J345 currently detects that a
fitted on the vehicle along with the trailer assist. trailer is attached to the vehicle.
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View on the lower touch display 672_087

If the vehicle is fitted with the park assist and trailer assist If control unit J345 does not detect a trailer, the button for the
systems, both virtual buttons are located in the same position on park assist can be seen. If a trailer is detected, the button for the
the lower touch display. This is possible because only one of these trailer assist appears in the same location.
two systems is available at any one time.

Picture on virtual button Function statuses and what they mean

The trailer assist is active. It is deactivated if the vehicle exceeds a speed of 10 km/h, if
the driver presses the button again or if one of the deactivation criteria is met.

The trailer assist can be activated. This is only possible if the vehicle is travelling for-
wards at a speed of between 0 km/h and max. 10 km/h.

The trailer assist cannot be activated at the moment. Reasons for this may be that the
vehicle is travelling at a speed above 10 km/h, the vehicle and trailer are reversing or
there may be a technical fault.

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Active trailer assist

If the trailer assist has been activated, the following images appear on the touch displays:

2 1 3 4 5 6

Swipe to adjust articulation angle of trailer

Tap twice to straighten trailer

View with trailer assist activated, 672_088 Entry area with trailer assist activated, 672_089
on upper touch display on lower touch display

The image shown by the reversing camera can be seen in illustration 672_088. The following segments of
the trailer assist are shown in the reversing camera’s image:
>> Blue part-circle (1)
>> This is the maximum permitted range in which the specified outside these markings, a correction will be made to the
articulated angle can move. The size of the part-circle alignment of the trailer.
depends on the drawbar length which is calculated during
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the calibration procedure for the trailer assist. The blue

part-circle widens for greater drawbar lengths and gets >> Blue pointer (3)
narrower for shorter ones. >> Shows the current articulation angle.

>> White triangles (2) >> Yellow pointer (4)

>> The two white triangles in the blue part-circle denote the >> Shows the articulation angle specified by the driver. The
“comfort range”. If the articulated angle is between the two vehicle calculates the trajectory along which it will continue
markings and the driver initiates reversing of the vehicle and to reverse such that the blue pointer moves towards the
trailer in a straight line, this is possible while retaining the yellow one until finally covering it. From this point onwards,
current alignment of the trailer. the current articulation angle is the same as the specified
However, if the driver does so while the articulation angle is articulation angle.

The bottom line of the display shows virtual buttons. The buttons indicated by numbers 5 and 6 have the
following functions:
>> Virtual button (5)
>> Deactivation/activation of the bottom touch display to adjust After the button indicated by number 5 is pressed, the top
the specified articulation angle. Following activation of the touch display is activated for entry and the options for
trailer assist, the bottom touch display (rather than the top operating the air conditioner re-appear on the bottom touch
touch display) is always activated for entry of the specified display.
articulation angle.
>> Virtual button (6)
>> Button for activating and deactivating the trailer assist.

Rear carrier detection

Version 1 of the trailer assist, which operates on the basis of an distinguish between a rear carrier and a trailer or caravan is dif-
articulation angle sensor, has a rear carrier detection function. This ficult and therefore prone to errors.
is used to distinguish between a classic trailer or caravan and a rear The check carried out on version 1 as to whether or not rotation of
carrier such as a bicycle rack. If a rear carrier is detected, it is not the magnetic ring in the towing bracket is detected during corner-
possible to activate the trailer assist even though the connection ing is, however, highly reliable. If rotation of the magnetic ring is
to the trailer socket has been detected. not detected during cornering and if the control unit J345 reports
Version 2 of the trailer assist, which operates on the basis of a connection at the trailer socket, this means that there is a rear
camera images, does not have a rear carrier detection function. carrier attached to the vehicle.
The reason for this is that using image processing software to

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Block diagrams

Version with reversing camera

Power steering Rear steering MMI display

control unit control unit J685
J500 J1019

Airbag ABS Lower touch display

control unit control unit J1060
J234 J104

Engine control unit Control unit in

J623 dash panel insert
J285
Reversing camera system
control unit
J772

Control unit 1 for

Calculation of information electronics
articulation angle from J794
camera image
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Data bus diagnostic inter-

face
J533

Onboard supply control

unit
J519
Trailer detector
control unit
J345 Software for trailer
assist function

672_090

Key:

Dash panel insert CAN Convenience CAN 2

Infotainment CAN MIB CAN
Convenience CAN FlexRay
Extended CAN

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Version with surround view cameras

Power steering Rear steering MMI display

control unit control unit J685
J500 J1019

Airbag Driver assist systems Lower touch display

control unit control unit J1060
J234 J1121

Calculation of
articulation angle from
camera image
ABS
control unit
J104

Engine control unit Control unit in Control unit 1 for

J623 dash panel insert information electronics
J285 J794
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Data bus diagnostic inter-

face
J533

Onboard supply control

unit
J519
Trailer detection
control unit
J345 Software for trailer
assist function
672_###

672_091

Key:

Dash panel insert CAN Convenience CAN 2

Infotainment CAN MIB CAN
Convenience CAN FlexRay
Extended CAN

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Distribution of functions among participating control units

Master control unit for trailer assist:

Onboard supply control unit J519

>> Is the master control unit for the trailer assist system.
>> Determines the current system status of the trailer assist.
>> Initiates the display of warning messages and information on
the instrument cluster as required.
>> Calculates different variables of the trailer assist and transmits
these so that they appear in the MMI display.
>> Requests the steering control units to set specific steering
angles for the front axle and, if applicable, for the rear axle.
>> Initiates protective braking of the vehicle/trailer combination if
necessary.
>> Performs a calibration procedure after a trailer has been
attached.

Partner control units:

Reversing camera system control unit J772 Rear wheel steering control unit J1019 (optional)
>> Calculates the current articulation angle based on the image >> Implements the rear axle steering angle requested by the
provided by the reversing camera. trailer assist.
>> Transmits the camera image with the image from the trailer
assist to control unit 1 for information electronics J794. Data bus diagnostic interface J533
>> Transmits the current articulated angle value to onboard supply >> Ensures the necessary exchange of information between the
control unit J519. various vehicle bus systems.
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Driver assist systems control unit J1121 Engine control unit J623
>> Reads in the image from the rear surround view camera and >> Prevents the vehicle/trailer combination from exceeding the
calculates the current articulation angle based on this image. maximum permissible speed if the trailer assist is active.
>> Transmits the camera image with the image from the trailer >> Deactivates the start/stop function if the trailer assist is active.
assist to control unit 1 for information electronics J794.
>> Transmits the current articulated angle value to onboard supply MMI display J685
control unit J519. >> Displays the current image from the reversing camera with the
information provided by the trailer assist.
ABS control unit J104 >> Provides controls for the trailer assist and detects when these
>> Initiates protective braking if requested by the trailer assist and controls are operated.
then keeps the vehicle stationary. >> Switches the lower touch display to the entry mode for the
>> Transmits the current vehicle speed to the vehicle bus system. trailer assist when the corresponding button is pressed.

Airbag control unit J234 Lower touch display J1060

>> Measures the vehicle’s current acceleration and provides this to >> Detects when the virtual button for the trailer assist has been
the trailer assist. pressed and transmits this to the onboard supply control unit
>> Transmits the current vehicle speed to the vehicle bus system. J519.
>> Detects entries made to control the trailer assist in the form of
Control unit in dash panel insert J285 swiping movements and touch operation, and transmits these
>> Displays specific warnings or information when requested by to the onboard supply control unit J519.
the trailer assist.
Control unit 1 for information electronics J794
Trailer detector control unit J345 >> Functions as a gateway between the infotainment CAN and the
>> Provides the trailer assist with the status “trailer detected” or MIB CAN.
“no trailer detected”. >> Calculates the appropriate specified articulation angle from the
>> Informs the trailer assist whether the trailer has been decou- detected touch movements.
pled when the vehicle/trailer combination is parked. This
detection feature also functions with the ignition switched off;
however, this only applies for trailers with bulbs as rear lights.

Power steering control unit J500

>> Implements the front axle steering angle requested by the
trailer assist.

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Control unit for laser distance control J1122

The laser scanner first introduced for the Audi A8 (type 4N) is also Equally, for adjustment of the laser scanner the modified installa-
fitted on the Audi Q8. The sensor unit from the Audi A8 (type 4N) tion position is taken into account by appropriate positioning of
is used. the optical target. The service operations are the same as for the
system in the Audi A8 (type 4N).
The laser scanner is located in the bumper next to the number
plate holder on the right side (as seen in direction of travel). The
higher position in relation to the road surface has been taken into
account by the control software.

Adaptive cruise control unit J428 (ACC)

As on the Audi A8 (type 4N), only one radar unit is fitted on the The radar unit is fitted on the left side of the vehicle (as seen in
Audi Q8. The laser scanner takes over the functions previously direction of travel) in the front bumper next to the number plate
provided by the second radar unit. The fourth-generation system holder.
used in the Audi Q8 has the same layout and works in the same The adaptive cruise control unit J428 also communicates via
way as the system in the Audi A8 (type 4N) and Audi Q7 (type 4M); FlexRay channel B in the Audi Q8.
it is also serviced in the same manner.
ProCarManuals.com

672_092

Control unit for laser distance control J1122 Adaptive cruise control unit J428 (ACC)

Reference
For detailed information on the design and function of the laser scanner, please refer to self-study programme 668 “Audi A8
(type 4N) Driver assist systems” and Service TV programme 0515.
Detailed information on adjusting the laser scanner is available in the Service TV programme 0516.

For further information on the radar unit, please refer to SSP 668 “Audi A8 (type 4N) Driver assist systems”, SSP 633 “Audi
Q7 (type 4M) Chassis” and SSP 620 “Audi ACC systems”, the current Workshop Manual and the relevant information shown
on the wheel alignment computer and the vehicle diagnostic tester.

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Infotainment and Audi connect

Introduction and overview of versions
The Audi Q8 features the MIB2+ version of the modular infotain- The MMI navigation plus system is equipped with Audi connect as
ment matrix infotainment system. Customers can choose between standard (may vary from country to country). The licence period is
two MMI versions: the MMI radio plus and the MMI navigation three years after the vehicle’s first registration. It can be renewed
plus. after this time has elapsed.
Both versions are based on the 2+ High version of the modular
infotainment matrix; MIB2+ High for short.

Depending on the country, the following Audi connect infotainment services may be available:
>> Connected radio (no licence period limits, but separate data >> Fuel prices
package required) >> Parking information
>> Navigation data update (4 times per year online or via SD card >> Travel information
via myAudi portal) >> Destination entry via myAudi app
>> Online routing >> Google Earth
>> Online news (customised) >> Google POI search via speech control
>> Online traffic information >> Messages
>> Twitter >> E-mail
>> Weather
>> Online traffic sign information
>> Hazard alerts

If the vehicle is equipped with Audi connect vehicle-related services (IW3), the following services may be available, depending on the country:
>> Audi emergency call (licence period: 10 years)
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>> Online roadside assistance (licence period: 10 years) >> Remote locking/unlocking (licence period: 3 years)
>> Audi service request (licence period: 10 years) >> Parking position (licence period: 3 years)
>> Vehicle status report (e.g. mileage, fuel tank level, etc.) >> Remote auxiliary heating (licence period: 3 years)
(licence period: 3 years)

1)
EL0 for markets without Audi connect
2)
IT1 includes 3-year Audi connect licence without Audi connect SIM
IT3 includes 3-year Audi connect licence with Audi connect SIM
3)
Depending on country, emergency call only (IW1) or emergency call and service (IW3)
4)
The Audi connect data module becomes a full telephone module with SAP
5)
For markets in which no storage compartment with interface for mobile telephone (smartphone connec-
tion to exterior aerial) is offered
6)
QU1 is the PR number if digital radio (QV3) and TV tuner (QV1) are ordered together
Q0B is the PR number if digital radio (QV3) and TV tuner with CI card reader (Q0A) are ordered together
7)
IW3 compulsory/licence period: 3 years
8)
Convenience key compulsory (4F2/4I3)
9)
IW3 compulsory/licence period: 1 year

Reference
For further information on MIB2+, please refer to self-study programme 666 "Audi A8 (type 4N) - Infotainment and
Audi connect” and Audi Training Online.

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MMI radio plus (I8E + 7Q0) MMI navigation plus (I8T + 7UG)

RADIO MEDIA CAR RADIO MEDIA TELEPHONE NAVIGATION

MESSAGES SETTINGS TELEPHONE TELEPHONE APPS CAR SETTINGS HELP

Standard equipment

8.8” touch display (top) with 1280 x 720 pixels 10.1” touch display (top) with 1540 x 720 pixels

8.6” touch display (bottom) with 1280 x 660 pixels 8.6” touch display (bottom) with 1280 x 660 pixels

7” display in instrument cluster with driver information system Audi virtual cockpit (9S8)
(9S7)

3D navigation system on SSD (7UG)

AM/FM radio
Connected radio (Internet radio)
Satellite radio for North America (Sirius) (QV3)
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Audi music interface with 2 USB sockets and 1 SDXC card reader Audi music interface with 2 USB sockets, 1 SDXC card reader and,
(UF7) depending on country, 1 SIM card reader (UF7)

Audi sound system (9VD) Audi sound system (9VD)

Bluetooth interface (9ZX) Bluetooth interface (9ZX)

UMTS/LTE data module (EL3)1 including Audi connect (IT3)2

Emergency call & Audi connect vehicle-related services (IW3)3 Emergency call & Audi connect vehicle-related services (IW3)3

Optional equipment

Single DVD drive (7D5) Single DVD drive (7D5)

Audi music interface in rear with 2 USB sockets (UF8)

Audi smartphone interface (IU1)

Audi phone box including wireless charging (9ZE) Audi phone box including wireless charging (9ZE)4

Audi phone box light (for wireless charging only) (9ZV)5 Audi phone box light (for wireless charging only) (9ZV)4/5

Bang & Olufsen Premium Sound System with 3D sound (9VS) Bang & Olufsen Premium Sound System with 3D sound (9VS)

Bang & Olufsen Advanced Sound System with 3D sound (8RF)

DAB digital radio (QV3) DAB digital radio (QV3)6

TV tuner (QV1/Q0A)6

Audi connect key (2F1)7/8

Audi vehicle tracking system (7I1/for use with driver card 7I2)9

Preparation for Rear Seat Entertainment (9WQ) Preparation for Rear Seat Entertainment (9WQ)

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MIB2+ High without navigation system

The Audi Q8 features the MMI radio plus as standard. The system is
an MIB2+ High. In this version, however, it does not have a naviga-
tion function or Audi connect.
The control unit 1 for information electronics J794 is fitted under
RADIO MEDIA CAR
the dash panel in front of the glove box and cannot be seen by the
customer. On the MMI radio plus system, the active surface area of
the MMI display is 8.6 inches.

MESSAGES SETTINGS TELEPHONE

MMI display J685 with MMI radio plus 672_093

The MMI radio plus has the following features as standard: The following additional equipment can be ordered:
>> Radio with phase diversity, FM dual tuner (very high frequency) >> Functions integrated in J794:
and AM tuner (medium wave) and background tuner >> DAB dual tuner (digital radio) (QV3)
>> Internal audio amplifier, 180 W (9VD) >> SDARS tuner (North America digital radio) (QV3)
>> Bluetooth interface for HFP and A2DP (9ZX) >> Functions in separate control units:
>> Speech dialogue system >> Single DVD drive (7D5)
>> 1 image output for Audi virtual cockpit >> Audi phone box (9ZE)
>> 1 image output for both touch displays (1280 x 720 and >> Audi phone box light (for wireless charging only) (9ZV)
1280 x 660 pixels) >> Bang & Olufsen Premium Sound System with 3D sound and
>> Audi music interface with 1 SDXC card reader and 2 USB 705 W (9VS)
sockets (UF7)
>> GPS receiver for time
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If the vehicle has the PR numbers "I8T" plus "7UH", this means
that it is fitted with MMI radio plus. LVDS to touch displays

GPS LVDS to virtual cockpit

Wi-Fi
LVDS from driver
assist systems
USB-AMI control unit
J1121
672_095

DAB FM2 Ethernet MOST bus

Connections on MMI radio plus 672_094 FM1/AM USB to DVD player

!
Note
A navigation aerial is also connected to the control unit 1 for information electronics J794 on the MMI radio plus. The time is
set automatically via the GPS signal.

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MIB2+ High with navigation system

The Audi Q8 can be equipped with the MMI navigation plus system
as an optional extra. This is also an MIB2+ High system. Depending
on the market, it may also include Audi connect.
The control unit 1 for information electronics J794 is fitted under
the dash panel in front of the glove box and cannot be seen by the RADIO MEDIA TELEPHONE NAVIGATION

customer. On the MMI navigation plus system, the active surface

area of the MMI display is 10.1 inches.

TELEPHONE APPS CAR SETTINGS HELP

MMI display J685 with MMI navigation plus 672_096

The following equipment is standard: The following additional equipment can be ordered:
>> Radio with phase diversity, FM dual tuner (very high frequency) >> Single DVD drive (7D5)
and AM tuner (medium wave) and background tuner >> Audi music interface in rear with 2 USB sockets (UF8)
>> Connected radio >> Audi smartphone interface (IU1)
>> SDARS tuner (North America digital radio) (QV3) >> Audi phone box including wireless charging (9ZE)
>> Audi music interface with 1 SDXC card reader, 2 USB sockets >> Audi phone box light (for wireless charging only) (9ZV)
(UF7) and, depending on country, 1 SIM card reader (EL3) >> Bang & Olufsen Premium Sound System with 3D sound and
>> 3D navigation with data on SSD and improved 3D city centre 730 W (9VS)
models (7UG) >> Bang & Olufsen Advanced Sound System with 3D sound and
>> UMTS/LTE-enabled mobile network module, possible data 1920 W (8RF)
transfer rates of up to 300 Mbit/s (EL3) for: >> DAB dual tuner (digital radio) (QV3)
>> Audi connect with 3-year licence period (depending on >> TV tuner (QV1/Q0A)¹
ProCarManuals.com

country) (IT3) including Wi-Fi hotspot with a possible data >> Preparation for Rear Seat Entertainment (9WQ)
transfer rate of up to 300 Mbit/s
>> Navigation with online routing
>> Connected radio and online radio (separate data package 1
QV1 for TV tuner and Q0A for TV tuner with CI card reader (CI =
required) Common Interface for pay TV)
>> Lifetime map updates (quarterly)
>> Emergency call and Audi connect vehicle-related serv-
ices (IW3), depending on country
>> Internal audio amplifier, 180 W (9VD)
>> Bluetooth interface for HFP and A2DP (9ZX)
>> Speech dialogue system LVDS to touch displays

>> Audi virtual cockpit (9S8) GPS LVDS to virtual cockpit

If the vehicle has the PR numbers "I8T" plus "7UG", this means
that it is fitted with MMI navigation plus.

LTE aerial 2
Wi-Fi
LTE aerial 1
LVDS from driver
USB-AMI assist systems
control unit
J1121
672_098

Connections on MMI navigation plus 672_097

DAB FM2 Ethernet MOST bus

FM1/AM USB to DVD player

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Sound
The following sound systems are available for the Audi Q8:
>> Audi sound system (9VD)
>> Bang & Olufsen Premium Sound System with 3D sound (9VS)
>> Bang & Olufsen Advanced Sound System with 3D sound (8RF)
Front right door loudspeaker
(mid-range and bass)
Both Bang & Olufsen sound systems can generate the third dimen- RX3
sion of 3D sound using a special algorithm.

Front right mid-range loudspeaker 2

R277

Front right
treble loudspeaker
R22

Centre loudspeaker
R208

Centre loudspeaker 2
R219

Front left mid-range

loudspeaker 2
R276
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Front left door loud- Rear left treble

speaker loudspeaker
(mid-range and bass) R14
RX2

Front left treble Rear left bass

loudspeaker loudspeaker
R20 R15

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Bang & Olufsen Premium Sound System with 3D sound (9VS)

The Bang & Olufsen Premium Sound System (9VS) provides the
customer with a 15-channel sound system. It can reach a total
power output of 730 W.

The premium sound system requires two loudspeakers to generate

the 3D sound. They are fitted in the A-pillars.

Rear right treble loudspeaker Right effect loudspeaker

R16 R210

Rear right bass

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loudspeaker
R17

Left effect loudspeaker

R209

Subwoofer
R211

672_099

Digital sound package

control unit
J525

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Bang & Olufsen Advanced Sound System with 3D sound (8RF)

Front right door loudspeaker
The best sound quality experience for customers is provided by the (mid-range and bass)
Bang & Olufsen Advanced Sound System. This system has 23 RX3
channels and reaches a total power output of 1920 W.
The Bang & Olufsen Advanced Sound System requires four loud-
Front right mid-range
speakers to generate the 3D sound.
loudspeaker 2
Two of these are in the A-pillars and two are in the headliner in R277
front of the rear handles.
On the Bang & Olufsen Advanced Sound System, the two treble
loudspeakers in the dash panel are retractable, as in the Audi A8.

Front right treble

loudspeaker
R22

Centre loudspeaker
R208

Centre loudspeaker 2
R219

Front left mid-range

loudspeaker 2
R276
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Front left door loudspeaker Rear left treble

(mid-range and bass) loudspeaker
RX2 R14

Front left treble Rear left door loudspeaker

loudspeaker (mid-range and bass)
R20 RX15

Rear left mid-range

loudspeaker 2
R341

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Rear right treble

loudspeaker Right effect loudspeaker
R16 R210

Rear right mid-range

loudspeaker 2
R340

Rear right door loudspeaker

(mid-range and bass)
RX16
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Left effect loudspeaker

R209

Subwoofer
R211

672_100

Digital sound package

control unit
J525

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Aerials
Rear window

The aerials for radio and TV reception in the Audi Q8 are integrated Which aerial amplifiers are fitted varies depending on which
in the rear window and rear spoiler. An aerial is only installed in the connections are actually required.
right side window for DAB. Depending on the country of delivery, the equipment on offer may
Depending on the vehicle equipment, the Audi Q8 can have up to vary. The image shows the maximum specification.
four aerial amplifiers. Whether these are fitted depends on exactly
what equipment is fitted in the vehicle.

FM2 connection

TV2 connection

Aerial amplifier 2
R111

AM aerial
in the spoiler
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FM2 aerial
in the rear
window

TV3 connection

Aerial amplifier 3 for TV

R84

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Aerial amplifier 4
R113

DAB aerial
FM1/AM/DAB connection

TV1
connection

Aerial amplifier
R24

672_101

FM/TV aerial
in the spoiler
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DAB aerial
in the rear
window

672_102

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Mobile phone aerials (country-specific)

The mobile phone aerials in the Audi Q8 are located on the roof, in second row of seats. In the illustrations that follow, both possible
the rear bumper and, depending on vehicle equipment and version, versions are shown with the maximum level of equipment for
in the area of the automatic belt retractor on the left side of the aerials.

Mobile phone aerials for connected gateway

In the EU version, the vehicle has an integrated mobile phone On this version, the telephone aerial on the roof is used both by the
aerial in the data bus diagnostic interface J533 (gateway). The control unit 1 for information electronics J794 and the data bus
system is also known as a connected gateway (CGW) in this case. diagnostic interface J533 (connected gateway). An aerial filter
which transmits the aerial signal to the corresponding control unit
is fitted in J533.

Aerial amplifier for

Audi phone box mobile telephone R86

LTE aerial 3
R330
Control unit 1 for
information electronics
J794 Emergency call
module aerial
R263

LTE aerial 2
R306
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672_103

Data bus diagnostic Emergency call

interface (connected module aerial 2
gateway) R322
J533 and LTE aerial 1
R297

Mobile phone aerials for emergency call module control unit and
communication unit J949 (connectivity box)
Depending on the country, the vehicle may be equipped with the If J949 is fitted, it is permanently connected to the emergency call
emergency call module control unit and communication unit J949. module aerial R263 (main aerial) and the emergency call module
This control unit (also referred to as the connectivity box) is being aerial 2 R322 in the roof aerial. The EU market launch version of
introduced for the first time in the North American market. the Audi Q8 does not have a connectivity box (J949).

Emergency call module control unit

Audi phone box Aerial amplifier for
and communication unit (connec-
mobile telephone R86
tivity box) J949

LTE aerial 3
R330

Control unit 1 for

information electronics
J794 LTE aerial 1
R297

Emergency call
module aerial
R263

Data bus diagnostic Emergency LTE aerial 2

672_104
interface (connected gateway) call module R306
J533 aerial 2
R322
Reference
For further information on the aerial filter in J533, please refer to self-study programme 669 “Audi A7 (type 4K)”.
For further information on the emergency call module control unit and communication unit J949, please refer to self-study
programme 669 “Audi A7 (type 4K)”.

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Networking
Topology
Lower touch display
J1060

MMI display Charging unit 1

J685 for mobile devices
J1146

Driver side
volume regulator
E67

Emergency call module USB hub USB connection 1

control unit and R293 U41
communication unit
J949 4)

DVD player TV tuner TV card reader

R7 R78 R204
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Control unit in
dash panel insert
J285

Data bus Control unit 1 for Digital sound package

diagnostic interface information electronics control unit
J533 J794 J525

1) 2)

Driver assist systems Control unit for

control unit head-up display
J1121 J898

Convenience system Reversing camera system

central control unit control unit
J393 J772 3)

Near field communication Near field communication

control unit control unit 2
J1169 J1170
672_105

Key:

Convenience CAN LVDS 1)

Connection only present if surround view
Infotainment CAN USB wires cameras fitted
Modular infotainment matrix (MIB) CAN Ethernet
2)
Only fitted from control unit version B
Sub-bus systems/private CAN Composite video onwards
MOST bus Connect CAN
3)
Not fitted if surround view cameras
installed
4)
Depending on country

Reference
For information on displays and operation, please refer to self-study programme 669 “Audi A7 (type 4K)”.

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Online system update

The Audi Q8 is equipped with the Audi connect service “online Scope of service, process for downloading and installing
system update” from market launch onwards.
“Online system update” is a vehicle-related service which – unlike If a software update is necessary for a control unit which is config-
all other Audi connect services – does not have a limited licence ured for this service, the update is performed over the air, meaning
period. that the customer does not need to bring the vehicle into the
workshop.

The following control units are currently configured for this

service:
>> Data bus diagnostic interface J533
>> Control unit 1 for information electronics J794
>> All infotainment-related control units
>> Control unit in dash panel insert J285
>> Driver assist systems control unit J1121

Lower touch display

J1060

MMI display
J685
Charging unit 1 for mobile devices
J1146
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Driver side volume regulator

E67
Emergency call module
control unit and
communication unit USB hub USB connection 1
J949 R293 U41

DVD player
R7

TV tuner
R78
Control unit in
dash panel insert
J285
TV card reader
R204
Data bus
diagnostic interface Control unit 1 for information electronics
J533 J794

Digital sound package

control unit
J525

Driver assist systems Control unit for

control unit head-up display
J1121 J898

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Control units which can currently be updated, using the Audi Q8 as an example

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Download and temporary storage of update files

If the target control unit is the data bus diagnostic interface J533
(connected gateway), the update files are downloaded via J533
itself.

Data bus
diagnostic interface
J533
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Download and temporary storage of update files for connected

gateway

If the vehicle is fitted with the emergency call module control unit
and communication unit J949, the download is performed via
J949.

In both cases, the update files are stored temporarily in J533.

Emergency call module
control unit and
communication unit
J949
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Data bus
diagnostic interface
J533
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Download and temporary storage of update files for connected gateway in

vehicles with J949

If the target control unit is one of the control units listed below,
the download is performed via the control unit 1 for information
electronics J794:
Control unit in
>> Control unit 1 for information electronics J794 dash panel insert
>> Any another infotainment-related control unit J285

>> Control unit in dash panel insert J285 (virtual cockpit)

>> Driver assist systems control unit J1121 Control unit 1 for
information electronics
J794

Driver assist systems

control unit
J1121

Download and temporary storage of update files for infotain- 672_109

ment-related control units, virtual cockpit and driver assist
systems control unit

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Requirements for download and installation

The following requirements must be met so that a system update

can be performed:
>> The person performing the update is the key user in the vehicle.
>> The vehicle has a data connection (for download).
>> The ignition is switched off (so that installation can be started).

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Online system update in the service portlet

In the future, the service partner will be able to use the service If the customer wishes software updates to be performed by the
portlet to check the download and installation status of updates service partner, the service partner can take over the process at any
on corresponding vehicles. A detailed overview will give the service time.
partner precise information on this topic.
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Reference
Further information on the Audi connect service “Online system update” can be found in the Service TV film of the same
name on Audi Training Online.

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Inspection and maintenance

Service interval display
The following service intervals are displayed:
>> Oil change service
>> Mileage-based service events
>> Time-based service events

Example of the service interval display on the MMI display of the Audi Q8:

Car Service intervals

Next oil change in

Flexible service event ---- mi / 730 days

Next inspection in
Mileage-based service 30,000 km / 730 days Time-based
event service event

Reset oil change interval

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On new vehicles, the next oil change due field is initially blank. events field is 730 days (2 years) for new vehicles and is updated
An interval calculated on the basis of the driving style and engine on a daily basis once the vehicle has a total mileage of about 500
load can only be displayed after a distance of about 500 km has km.
been driven. The value displayed in the mileage-based service
events field is 30,000 km for new vehicles and is counted down in
100 km blocks. The value displayed in the time-based service

Resetting the service interval display

It is very important to use the vehicle diagnostic tester to reset the

service interval display after a service event.

The following is then displayed in the service interval display:

Oil change (flexible service event for markets with service interval
extension):
After resetting, the mileage last reached is displayed. A new,
updated display is shown after a distance of about 500 km has
been covered.
The “days” display is set to 730 days immediately.

Car Service intervals

Next oil change in

27,000 km / 730 days

Reset oil change interval

Example: 672_113
Oil change is due at 27,000 km.
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Oil change (fixed interval - – depends on market):

After resetting, the mileage last reached is displayed. A new, updated display is shown after a distance of about 500 km
has been covered. The “days” display is set to 365 days immediately.

Car Service intervals

Next oil change in

15,000 km / 365 days

Reset oil change interval

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Mileage-based service event:

As the mileage-based service event is always at a fixed This display may vary if the inspection is not performed
mileage, multiples of 30,000 km are displayed here in 30,000 km cycles.
(30,000, 60,000, 90,000 … km).
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Car Service intervals

Next inspection in
32,000 km

Reset oil change interval

Example: 672_115
The inspection has been performed at 28,000 km
(2,000 km “early”).

Time-based service event:

The time-based service event is always set to another two years (730 days).

Resetting oil change interval manually:

The oil change interval can be reset manually in the MMI. In markets with service interval extension, the oil change interval
is then set to a fixed interval.

!
Note
It is not permitted to “miss out” service events.
The information provided in the up-to-date service literature applies. Maintenance intervals are displayed when the mainte-
nance tables are created.

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Appendix
Test your knowledge

Question 1: On the new Audi Q8, which of these parts is made of steel?

a) Doors
b) Bonnet
c) Rear lid
d) Wings

Question 2: What is the percentage of ultra-high strength steel (hot-formed) in the body structure of the Audi Q8?

a) 24.4 %
b) 34.4 %
c) 14.4 %
d) 44.4 %

Question 3: What is particularly notable about the sequence of control units using the MOST bus on the Audi Q8?

a) The sequence of control units in the MOST bus on the Audi Q8 is completely different to that on the Audi A6, A7 and A8.
b) The sequence of control units in the MOST bus on the Audi Q8 is the same as the sequence familiar from the Audi A6, A7
and A8.
c) A MOST data bus is not used on the Audi Q8.
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Question 4: On the Audi Q8, what happens after the exterior mirrors have been heated at full power?

a) After full heating power has been used briefly, the heating of both exterior mirrors is always switched off.
b) Heated exterior mirrors are not available for the Audi Q8, either as standard or optionally.
c) Following this brief use of full heating power, heating of the exterior mirrors continues depending on the speed of the
vehicle and the outside temperature.

Question 5: Which of these points should be noted when fitting the headlight mounting?

a) To set the eccentric adjuster, only the lower securing bolt may be loosened.
b) The two markings on the eccentric adjuster must align.
c) The eccentric adjuster must be rotated all the way to the right before assembly.
d) The eccentric adjuster must be rotated all the way to the left before assembly.

Question 6: What is the purpose of the coloured markings on the water drain hoses for the panoramic sunroof?

a) They are a tolerance measurement to determine the correct size of the hose retainer.
b) They show where the hoses may be severed during servicing work.
c) A loss of colour shows that the hose is worn and must be renewed.
d) They make it easier to position the hoses precisely in their retainers.

Question 7: How many different fragrances does the fragrance diffuser system offer in the Audi Q8?

a) 3 fragrance types with 3 different intensities

b) 2 fragrance types with 3 different intensities
c) 2 fragrance types with 4 different intensities
d) 4 fragrance types with 2 different intensities

Solutions: 1b, 2c, 3b, 4c, 5b, 6d, 7c

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Question 8: In which control unit are the air conditioner controls now integrated?

a) Control unit J255

b) Control unit N814
c) Onboard supply control unit J519
d) Onboard supply control unit V320

Question 9: What particular feature is fitted on the 8-speed automatic gearbox 0D5 in the Audi Q8 with MHEV technology?

a) A hydraulic pulse accumulator.

b) An auxiliary hydraulic pump 1 for gearbox oil V475.
c) This gearbox always has 3 oil circuits.
d) This gearbox always has dual-circuit ATF temperature regulation.

Question 10: At market launch, which gearbox and drive version is used for the Audi Q8?

a) The 8-speed automatic gearbox 0D5 and the quattro drive system with self-locking centre differential and rear final drive
with open differential.
b) The 8-speed automatic gearbox 0D5 and the quattro drive system with ultra technology.
c) The 8-speed automatic gearbox 0D5 and the quattro drive system with self-locking centre differential and rear final drive
with sport differential.
d) The 7-speed dual clutch gearbox 0CL and the quattro drive system with self-locking centre differential and rear final drive
with open differential.
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Question 11: Which loudspeakers are used on the Audi Q8 to generate the 3D sound on the Bang & Olufsen Advanced Sound
System?

a) Only the loudspeakers in the A-pillars.

b) The loudspeakers in the A-pillars and D-pillars.
c) The loudspeakers in the A-pillars and the headliner.
d) The centre loudspeakers and the subwoofer.

Question 12: Where are the DAB aerials installed on the Audi Q8?

a) Left side window and rear spoiler

b) Right side window and rear spoiler
c) Left side window and rear window
d) Right side window and rear window

Question 13: How far or for how long can an Audi Q8 48V MHEV be driven using electric power only?

a) Max. 50 km
b) Max. 40 seconds
c) Fully electric driving is not possible with an Audi Q8 48V MHEV.
d) Max. 150 km

Question 14: How is the alternator on the Audi Q8 powered?

a) By the 48V lithium-ion battery.

b) By the engine via a poly V-belt.
c) By the engine via the teeth of the flywheel.
d) By the 12V battery and the 48V/12V voltage converter.

Solutions: 8c, 9b, 10a, 11c, 12d, 13c, 14b

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Self-study programmes
For more information on the technology featured on the Audi Q8, please refer to the following self-study programmes.

SSP 632 Audi Q7 (type 4M) SSP 633 Audi Q7 (type 4M)
Chassis

SSP 662 Audi A8 (type 4N) SSP 664 Audi A8 (type 4N)
Electrics and electronics
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SSP 666 Audi A8 (type 4N) SSP 668 Audi A8 (type 4N)
Infotainment and Audi connect Driver assist systems

SSP 669 Audi A7 (type 4K) SSP 670 Audi A6 (type 4A)

Reference
The following self-study programmes also contain further information on the technology featured on the Audi Q8:
>> SSP 457 “Audi A8 ’10 Power transmission - 8-speed automatic gearbox 0BK/0BL”
>> SSP 620 “Audi ACC systems”
>> SSP 636 “Audi Q7 (type 4M) Trailer assist”
>> SSP 655 “Audi 3.0l V6 TFSI engine”
>> SSP 656 “3.0l TDI engine EA897evo2 series”

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Subject to technical revision.

Copyright
AUDI AG
I/VK-35
service.training@audi.de

AUDI AG
D-85045 Ingolstadt
Technical status 05/18