Self Study Program 970293 – The 2019 Audi A8 Electrics and Electronics

Self Study Program 970293 – The 2019 Audi A8 Electrics and Electronics PDF. The fourth generation of the brand flagship is, once again, the reference point defining the Audi brand – due to a new design language, an innovative touch concept and the introduction of mild hybrid technology (MHEV).

The MHEV technology of Audi is based on the newly developed 48 volt electrical system – it supplies the 12 volt electrical system, which in this case is the electrical subsystem. The 48-volt electrical system is powered by a belt alternator starter (BAS) which is connected to the engine serpentine drive. A lithium-ion battery, positioned safely under the luggage compartment floor, serves as an energy storage device.

Taken together, these measures further improve the already high fuel efficiency of the engines.

The mild hybrid drive in the new Audi A8 has two central building blocks. One of them is the water-cooled belt starter generator mounted to the end face of the engine. A high-performance poly V belt connects it to the crankshaft. The belt starter generator has a recuperation capacity of 12 kW and produces up to 44.25 lb ft (60 Nm) of torque.

The second component is a lithium-ion battery with a charge capacity of 10 Ah and a voltage capacity of 48 volts. The newly developed 48-volt electrical system is the main electrical system. The 12-volt electrical system is coupled to the main electrical system via a DC-to-DC converter. The lithium-ion
battery housed in the luggage compartment is about the same size as a large lead acid battery. A closed-loop air cooling system provides thermal management.

The 48-volt MHEV technology is particularly unobtrusive and efficient. When the driver takes his foot off the accelerator at speed of between 34.1 and 99.4 mph (55 and 160 km/h), the car can coast for up to 40 seconds with the engine completely disengaged. The start-stop phase begins at 13.6 mph (22 km/h) when coasting at low speed. For a more complete description of an MHEV.

Learning objectives of this eSelf-Study Program:

This eSelf-Study Program describes the electrical and electronic systems of the 2019 A8. When finished, you will be able to:

  • Explain the components of the 48-volt electrical system.
  • Explain the functions and tasks of the Starter Generator C29.
  • List the installation locations and new features of the control modules for the electrical system, networking and comfort/convenience electronics.


  • Introduction
  • Power supply
    • 12-volt car battery
    • Jump start terminal
    • 12-volt supply structure
    • Fuses and relays
    • Electrical wiring
  • 48-volt electrical system
    • General description
    • Components of the 48-volt electrical system
    • Design of the 48-volt electrical system
    • Starter Generator C29
    • 48 Volt Battery A6
    • Voltage Converter, 48V/12V A7
    • Working on the 48-volt electrical system
    • The 48-volt MHEV (Mild Hybrid Electric Vehicle)
  • Networking 
    • Topology
    • Bus systems used in the Audi A8
  • Control modules
    • Data Bus on Board Diagnostic Interface J533
    • Vehicle Electrical System Control Module J519 (BCM1)
    • Windshield wiper and washer system
    • Comfort System Central Control Module J393 (BCM2)
    • Rear Lid Control Module J605
    • Garage Door Opener Control Module J530
    • Windshield Defogger Control Module J505
    • Instrument Cluster Control Module J285
    • Windshield Projection Head Up Display Control Module J898
    • Door Control Modules J386/J387
    • Memory Seat/Steering Column Adjustment Control Module J136/J521
    • Sunroof Control Module J245/J392
    • Power Adjustable Steering Column Control Module J866
    • Electronic Steering Column Lock Control Module J764
    • Steering Column Electronics Control Module J527
  • Audi drive select 
    • Controllable systems
    • Driving modes
    • Displays and operation
  • Exterior lighting 
    • Operation
    • Headlights
    • Matrix beam
    • Laser lights (S8)
    • Tail lights
  • Interior lighting 
    • Background lighting
    • eSelf-Study Programs
  • Knowledge assessment

The eSelf-Study Program (eSSP) teaches a basic understanding of the design and mode of operation of new models, new automotive components or new technologies.

It is not a repair manual! Figures are given 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.

Language: English
Format: PDF
Pages: 113

Self Study Program 970293 – The 2019 Audi A8 Electrics and Electronics

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