Self-Study Programme 481 Audi A7 sportback onboard power supply and networking pdf.pdf

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Self Study Programme 481
Audi A7 Sportback
Onboard power supply and networking
Audi
Service Training
Four-zone air conditioning, head-up display, Bang & Olufsen
Advanced Sound System, navigation, WLAN hotspot, massage
seats, LED headlights, night vision assist, Audi pre sense, Keyless
Go, Audi drive select, start-stop system, Audi active lane assist,
reversing camera — all these and other convenience features and
safety functions would not be possible without the use of increas-
ingly efficient electronics.
Prerequisites for perfect functioning of these electronics are a
stable and reliable onboard power supply as well networking of the
control units via their bus systems to facilitate high-speed data
exchange between miscellaneous complex systems.
To achieve all this, the Audi A7 Sportback comes equipped with:
•
•
•
•
•
Main battery lead made of aluminium
Alternator with recuperation function
Voltage stabiliser for start-stop system
FlexRay bus system
LED headlights
This Self Study Programme provides you with a fast and efficient
in-depth guide to the electronics of the Audi A7 Sportback.
481_050
Learning objectives of this Self Study Programme are:
When you have worked your way through this Self Study Pro-
gramme, you will be able to answer the following questions:
• Where are the fuse carriers installed on the Audi A7 Sportback
and how are they supplied with power?
• Where are electrical components fitted on the vehicle?
• Which bus systems are used on the Audi A7 Sportback?
• Which functions are performed by the onboard power supply
control unit J519?
• Where are the CAN isolating connectors located and which bus
systems are connected to them?
• What are the new features of the FlexRay bus system?
• What are the new features of the exterior lighting?
• What does ESD protection mean and what relevance does it
have to the repair of electronic components?
2
Contents
Power supply
Jump start terminals _______________________________________________________________________________________________________________________________________
Battery _______________________________________________________________________________________________________________________________________________________
Main battery lead ___________________________________________________________________________________________________________________________________________
Supply structure _____________________________________________________________________________________________________________________________________________
Fuses and relays _____________________________________________________________________________________________________________________________________________
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5
5
6
7
Networking
Installation locations of the control units ________________________________________________________________________________________________________________ 8
Topology ____________________________________________________________________________________________________________________________________________________ 10
New features of the bus system __________________________________________________________________________________________________________________________ 12
CAN isolating connector ___________________________________________________________________________________________________________________________________ 13
CAN adaptor V.A.G 1598/38 ______________________________________________________________________________________________________________________________ 13
FlexRay ______________________________________________________________________________________________________________________________________________________ 14
Control units
Data bus diagnostic interface J533 ______________________________________________________________________________________________________________________ 16
Battery monitor control unit J367 ________________________________________________________________________________________________________________________ 17
Alternator C _________________________________________________________________________________________________________________________________________________ 18
Voltage stabiliser J532 ____________________________________________________________________________________________________________________________________ 19
Onboard power supply control unit J519 ________________________________________________________________________________________________________________ 20
Exterior lighting
Light switch _________________________________________________________________________________________________________________________________________________ 22
headlights __________________________________________________________________________________________________________________________________________________ 24
Side marker lights __________________________________________________________________________________________________________________________________________ 34
Tail lights ____________________________________________________________________________________________________________________________________________________ 34
Service
Electronic repairs with ESD protection ___________________________________________________________________________________________________________________ 38
Self Study Programmes ___________________________________________________________________________________________________________________________________ 39
• The Self Study Programme explains the basics of the design and function of new models, new automotive
components or new technologies.
It is not a Repair Manual! Figures given are for explanatory purposes only and refer to the data valid at the
time of preparation of the SSP.
For further information about maintenance and repair work, always refer to the current technical literature.
!
Note
Reference
3
Power supply
Jump start terminals
Potential distributor in plenum
chamber
Main battery lead
Electromechanical steering
supply cable
4
Jump start terminals
The jump start terminals are located in the engine bay on the right.
The positive terminal is connected to the main battery lead via
potential distributors in the plenum chamber and supplies the
alternator and starter with electrical power. The ground terminal is
located on the wing inner panel.
Battery in spare wheel well
Battery
The battery in the Audi A7 Sportback is housed centrally in the
spare wheel well. The main fuse carrier and the battery isolator are
connected to the battery's positive terminal. The battery monitor
control unit J367 is located at the negative terminal. This control
unit forms a physical unit with the grounding cable connected to
the grounding point in the spare wheel well. An AGM battery
1)
is
fitted on all models with a start-stop system and/or an auxiliary
heater.
The following batteries are used on the Audi A7 Sportback:
Standard batteries
• 80 Ah/380 A
• 110 Ah/520 A
AGM batteries
•
•
•
•
68 Ah/380 A
75 Ah/420 A
92 Ah/520 A
105 Ah/580 A
Main battery lead
The main battery lead on the Audi A7 Sportback is designed as a
flexible aluminium ribbon cable and connected to the battery's
positive terminal via the battery isolator.
It is routed out of the spare wheel well together with the supply
lead (round aluminium cable) for the electromechanical steering
through a rubber grommet and then runs along the underbody on
the left-hand side of the vehicle.
481_036
Main battery cable feed-
through from the wheel well
into the plenum chamber
Feed-through from the spare
wheel well to the vehicle
underbody
The two cables are separated in the front left wheel well and the
ribbon cable is routed to the potential distributor through a
further rubber grommet in the plenum chamber.
The round cable is routed directly to the electromechanical steer-
ing in the engine bay.
1)
English:
Absorbant Glass Mat
5

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