for height, angle and distance

Front seat sub-frame
of high-strength steel
Electric seat adjustment

644_009

Optional sport seat
The sport seats have electrically adjustable
lumbar supports and are optionally available
with seat ventilation.

Driver Seat Backrest Blower Fan V388

Driver Seat Cushion Blower Fan V390

Driver Seat Adjustment Control Head E470

Memory Seat/Steering Column Adjustment
Control Module J136
644_010
12

Seat memory
The memory function allows personal seating profiles to be
stored for the driver. The memory function can be operated
with the radio remote key or with the recall buttons in the
driver's door.
Whenever the vehicle is locked, the driver's seat profile is
stored and assigned to the key. The seat profile is automatically recalled when the door is opened.
The outside rear view mirror settings are also stored with
the seat memory.

System overview and signal characteristic
The information from Driver Memory Seat Control Head
E97 is processed by Driver Door Control Module J386.

This information is then transferred to Memory Seat/
Steering Column Adjustment Control Module J136 via the
Convenience CAN. The seat module then activates the
corresponding control motors.

Convenience CAN

644_027

Key:
E97

Driver Memory Seat Control Head

J136 Memory Seat/Steering Column Adjustment Control Module
J386 Driver Door Control Module
J519 Vehicle Electrical System Control Module

V243 Driver Seat Angle Adjustment Motor
V245 Driver Seat Height Adjustment Motor
V256 Driver Seat Depth Adjustment Motor
TSVL Left Front Seat Coupling Station

13

Occupant protection
Passive safety
Driver airbag

Front passenger airbag

Driver side knee airbag

Components
Front side airbag

The Audi A4 sedan has the following components and
systems:
• Airbag control module
• Adaptive driver airbag
• Adaptive front passenger airbag
(front passenger airbag, two-stage)
• Front side airbags
• Rear side airbags (equipment option)
• Side curtain airbags
• Knee airbags
• Front airbag crash sensors
• Crash sensors for side impact detection in the doors
• Crash sensors for side impact detection in the ‘C’ pillars
• Center pedestrian protection crash sensor
(acceleration sensor)

14

•
•
•
•
•
•
•
•

Front inertia-reel safety belts with pyrotechnic belt tensioners
Front inertia-reel safety belts with electrical belt tensioners
Front inertia-reel safety belts with active belt force limiters
Inertia-reel safety belts for second seat row with pyrotechnic
belt tensioners, driver and front passenger sides
Safety belt warning for all seats
Front passenger airbag OFF and ON warning lamp
Driver and front passenger seat position sensors
Battery interrupt igniter

Passenger side knee airbag

Front side airbag

Head airbag,
driver and front passenger side

Rear side airbag

Rear side airbag

644_115

15

System overview

644_003a
16

Additional equipment
Equipment specifications may vary due to the different
requirements and statutory provisions which apply to
vehicle manufacturers in the various markets.
Key to illustration on page 16:
E24
E25
F390
F391
F392

Driver Seat Belt Switch
Front Passenger Seat Belt Switch
Driver Side Second Row Seat Belt Switch
Center Second Row Seat Belt Switch
Passenger Side Second Row Seat Belt Switch

G128
G179
G180
G256
G257
G283
G284
G551
G552
G553
G554

Front Passenger Occupant Detection Sensor
Driver Thorax Airbag Crash Sensor
Front Passenger Thorax Airbag Crash Sensor
Driver Side Rear Thorax Airbag Crash Sensor
Passenger Side Rear Thorax Airbag Crash Sensor
Driver Front Airbag Crash Sensor
Passenger Side Front Airbag Crash Sensor
Driver Belt Force Limiter
Front Passenger Belt Force Limiter
Driver Seat Position Sensor
Front Passenger Seat Position Sensor

J234
J285
J533
J706
J854
J855

Airbag Control Module
Instrument Cluster Control Module
Data Bus On Board Diagnostic Interface (Gateway)
Passenger Occupant Detection System Control Module
Left Front Seat Belt Tensioner Control Module
Right Front Seat Belt Tensioner Control Module

K19 Seat Belt Indicator Lamp
K75 Airbag Indicator Lamp
K145 Front Passenger Airbag -Disabled- Indicator Lamp
N95
N131
N132
N153
N154
N196
N197
N199
N200
N201
N202
N251
N252
N253
N295
N296
N490
N491

Driver Airbag Igniter
Front Passenger Airbag Igniter 1
Front Passenger Airbag Igniter 2
Driver Seat Belt Tensioner Igniter 1
Front Passenger Seat Belt Tensioner Igniter 1
Driver Side Rear Seat Belt Tensioner Igniter
Passenger Side Rear Seat Belt Tensioner Igniter
Driver Thorax Airbag Igniter
Front Passenger Thorax Airbag Igniter
Driver Side Rear Thorax Airbag Igniter
Passenger Side Rear Thorax Airbag Igniter
Driver Head Curtain Airbag Igniter
Front Passenger Head Curtain Airbag Igniter
Battery Interrupt Igniter
Driver Knee Airbag Igniter
Front Passenger Knee Airbag Igniter
Driver Airbag Release Valve Igniter
Front Passenger Airbag Release Valve Igniter

T16

Data Link Connector

Wire colors:
Diagnostics CAN
Infotainment CAN
FlexRay
Input signal
Output signal

17

Sensors
Front Passenger Occupant Detection Sensor G128 with
Passenger Occupant Detection System Control Module J706
Front Passenger Occupant Detection Sensor G128 is a
second-generation component that was also used on the
2015 Audi TT for the North American market. In this
new-generation system, the seat heater element (Front
Passenger Seat Heating Element Z8) serves not only as a
seat heater but also as a sensor mat for seat occupancy
recognition. As before, capacitive sensors are used for
occupancy recognition.

Passenger Occupant Detection System Control Module
J706 is connected to ground by a discrete wire. To prevent
interference with the capacitive system, the wires leading
to Front Passenger Occupant Detection Sensor G128 are
shielded. J706 is connected to Airbag Control Module J234
by a LIN bus.

644_012

Front Passenger Occupant Detection Sensor
G128

644_013

Service Kit
Front Passenger Occupant Detection Sensor G128 and
Passenger Occupant Detection System Control Module J706
are calibrated to one another during the manufacturing
process. In the event of a fault to either of these components, they must be replaced as a unit. It is not permitted
to interchange individual components.

The electrical plug between G128 and J706 must never be
disconnected. Two Service Kits are available depending on
the trim level of the vehicle.

Service Kit version 1

Service Kit version 2

• Passenger Occupant Detection System Control
Module J706.
• Seat cushion.
• Front Passenger Occupant Detection Sensor
G128 including wiring. In this case, the sensor is
bonded to the seat upholstery.

• Passenger Occupant Detection System Control
Module J706.
• Seat upholstery.
• Front Passenger Occupant Detection Sensor G128
including wiring. In this case, the sensor is stitched
to the seat upholstery.

Diagnostics
Both G128 and J706 are diagnosed via Airbag Control
Module J234.

18

If a Service Kit is replaced, a basic setting procedure must
be performed using the Guided Fault Finding function. In
this case, the serial number of the Service Kit is transferred
to the Airbag Control Module.

Airbag Control Module J234
The Airbag Control Module for the new Audi A4 is based on
the control module of the 2017 Audi Q7. The characteristics have been adapted to the Audi A4.

Sensors
As in the 2017 Audi Q7, the driving dynamics control
sensors are integrated in the Airbag Control Module of the
Audi A4. These sensors measure acceleration in the X and Y
directions as well as the yaw rate about the Z axis.
The driving dynamics control sensors work in a lower acceleration and deceleration range than the crash sensors. The
acceleration and deceleration levels which may occur
during a collision are different to those which may occur
when a vehicle loses grip (for example, oversteer, understeer).

644_103

Airbag Control Module
J234

If the vehicle is equipped with dynamic steering (PR
No. 1N8) or the quattro sport differential (PR No. GH2),
the driving dynamics control sensors are duplicated in the
Airbag Control Module J234. This provides redundant
(multiple) backup for the sensor signals for dynamic steering and quattro Sport.

Note
The Dynamic steering system and also the Sport differential will not be available at vehicle launch.
19

Active safety
Audi pre sense
The Audi pre sense system (pre sense city, pre sense basic,
pre sense rear, pre sense front, collision avoidance assist or
turn assist) of the Audi A4 has the same on-board pre sense
functions as the 2017 Audi Q7.

The components and the specifications have been adapted
to suit the A4. In functional terms, the Audi pre sense
functions in the A4 are identical to those in the 2017
Audi Q7.

Display in instrument cluster

Pre sense city with pedestrian recognition function

Audi pre sense

54 mi
12:00

AUTO

D4

15 mi
71°F

644_030

644_031

Turning assist

644_032

Collision avoidance assist

644_033

Reference
For detailed information about Audi pre sense, refer to eSelf-Study Program 970363, The 2017 Audi Q7 Occupant Protection
and Infotainment Systems.
20

Engines
Torque/power curve of 2.0l TFSI engine
Engine with code CYMC
  Power output in hp (kW)
  Torque in lb ft (Nm)

309.8 lb ft (420 Nm)

281.6 hp (210 kW)

265.5 lb ft (360 Nm)

241.4 hp (180 kW)

221.3 lb ft (300 Nm)

201.1 hp (150 kW)

177.0 lb ft (240 Nm)

160.9 hp (120 kW)

132.8 lb ft (180 Nm)

120.7 hp (90 kW)

88.5 lb ft (120 Nm)

80.5 hp (60 kW)

44.2 lb ft (60 Nm)

40.2 hp (30 kW)

Engine speed [rpm]

644_016a

Features
Engine code

CYMC

Type

4-cylinder inline engine

Displacement

121.1 cu in (1984 cc)

Stroke

3.65 in (92.8 mm)

Bore

3.25 in (82.5 mm)

Number of valves per cylinder

4

Firing order

1-3-4-2

Compression ratio

9.6 : 1

Power output at rpm

252.0 hp (188 kW) @ 4200 - 6200

Torque at rpm

273 lb ft (370 Nm) @ 1450 - 4200

Fuel type

Premium unleaded 91 AKI

Engine management system

SIMOS 18.4

Lambda/knock control

Adaptive lambda control, adaptive knock control

Mixture formation

Direct fuel injection (FSI)

Exhaust gas treatment

Close-coupled ceramic calatyst, oxygen sensors before and after catalytic converter

Emission standard

LEV III Tier 3
21

Fuel tank
The fuel systems in the Audi A4 have the following
features:
• Compact design.
• Maximum integration of components to reduce fuel
system evaporative emissions.
• No carrier plate.

The illustration shows the fuel tank of a front wheel drive
vehicle with auxiliary heating. The auxiliary heating is
optional equipment but not available in the North American Region (NAR).
Filling volume
Front wheel drive

15.3 gal (58 l)

quattro drive

14.3 gal (54 l)

• Fuel delivery system with large integral swirl pot.
• Use of sound-insulating baffles.
• The components in the secondary chamber for
example, fuel level sender in quattro models, are not
accessible to service personnel. There is only one
service port in the fuel tank.
• A liquid trap with active extraction system is integrated in the fuel tank ventilation system.
• Fluid separator at top of fuel tank filler neck.

Fuel delivery and sender unit

Fuel vent valve

Rollover valve

Baffle

22

Fuel supply line

Vent line
Fluid separator

Carbon canister

Fuel filler neck

Liquid trap with active extraction system

644_039

23

Tank ventilation system
Due to the space constraints in new models, the tank ventilation system has been revised. It was important to ensure
that siphoning cannot occur in the line from the fuel filler
neck to the carbon canister.

Tank ventilation function

Effects of failure of the tank ventilation system
If one of the components of the ventilation system fails,
problems may occur during refuelling (refuelling shut-off).
A strong fuel odor could also be noticeable in gasolineengined vehicles due to carbon canister flooding.

The system requires a larger liquid trap due to the boiling
characteristic of the fuel. The fuel that has collected in the