Audi A6-S6 (C8-4K) | 2018-2025 | Fuse Box Diagrams and Locations

The fifth-generation Audi A6 and S6 (chassis codes C8/4K), Audi’s premium mid-size luxury sedan and its high-performance variant, has been available from 2018 to the present. Known for its cutting-edge technology, refined design, and dynamic performance, the A6 and S6 continue to set benchmarks in the luxury sedan market.

In this article, you will find detailed fuse box diagrams for Audi A6 and S6 models produced in 2018, 2019, 2020, 2021, 2022, 2023, 2024 and 2025. These diagrams provide crucial insights into the vehicle’s electrical systems, helping owners and technicians understand the assignment of each fuse (fuse layout). This information is essential for diagnosing electrical issues, performing maintenance, or addressing necessary repairs.

This guide serves as an indispensable resource for understanding the electrical system of the fifth-generation Audi A6 and S6, ensuring that owners have the knowledge and tools needed to maintain the reliability, functionality, and performance of these luxurious and innovative sedans.

Fuse Box Location

Passenger Compartment

In the cabin, there are two fuse blocks.

The first is on the left front side of the cockpit.

The location of the fuses in the passenger compartment: Audi A6 / S6 (2018-2020...)

And the second is in the driver’s footrest on left-hand drive vehicles, or behind the lid on front passenger footwell on right-hand drive vehicles.

The location of the fuses in the passenger compartment: Audi A6 / S6 (2018-2020...)

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Luggage Compartment

The fuses are under the lid in the trunk floor.

The location of the fuses in the trunk: Audi A6 / S6 (2018-2020...)

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Fuse Box Diagrams

Cockpit fuse panel

Cockpit fuse panel diagram: Audi A6 / S6 (2018, 2019, 2020...)

Assignment of the fuses on the left side of the dashboard

№Description
Fuse panel A (black)
A2Steering column adjustment
A3CD/DVD player
A4Steering column electronics
A5Light switch, switch panels
A6Volume control
A7Instrument cluster
A8Front MMI (Upper/lower) display
A9Steering wheel heating
Fuse panel B (brown)
B2MMI Infotainment system control module
B32018-2021: Audi music interface
from 2022: Audi music interface, USB connection
B4Head-up display
B5Climate control system, fragrance system, ionizer
B9Steering column lock

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Footwell fuse panel

The fuse assignment “C” and “D” is in the opposite order on right-hand drive vehicles.

Footwell fuse panel diagram: Audi A6 / S6 (2018, 2019, 2020...)

Assignment of the fuses in the footwell

№Description
Fuse panel A (black)
A12018-2019: Not Used;
from 2020: Catalytic converter heating
A2Engine components
A3Engine components
A4Engine components
A5Brake light sensor
A62018-2019: Engine components;
2020-2021: Engine valves
from 2022: Engine valves, camshaft adjustment
A7Engine components
A8Engine components
A92018-2020: Engine components
from 2021: Engine components, 48 V water pump, 48 V drivetrain generator
A10Oil pressure sensor, oil temperature sensor
A112018-2019: Engine start;
2020: Engine components
from 2021: Engine components, 48 V water pump, 48 V drivetrain generator, 12 V drivetrain generator
A122018-2020: Engine components
from 2021: Engine valves, engine mount
A13Radiator fan
A142018-2019: Engine control module;
from 2020: Engine control module, fuel injectors
A152018-2020: Engine sensors
from 2021: Engine sensors, ignition coils, oxygen sensors
A16Fuel pump
Fuse panel B (red)
B1Anti-theft alarm system
B2Engine control module
B3Left front lumbar support
B5Horn
B6Parking brake
B7Gateway control module (diagnosis)
B82018-2019: Interior headliner lights;
from 2020: Roof electronics control module
B9Driver assist systems control module
B10Airbag control module
B112018-2019: Electronic Stabilization Control (ESC);
from 2020: Electronic Stabilization Control (ESC), Anti-Lock Braking System (ABS)
B12Diagnostic connector, light/rain sensor
B13Climate control system
B14Right front door control module
B15Climate control system compressor, body electronics
B162018-2019: Auxiliary battery control module;
from 2020: Auxiliary battery control module, brake system pressure reservoir
Fuse panel C (red)
C1Engine ignition coils
C32018-2019: Not Used;
from 2020: High-voltage heating, compressor
C5Engine mount
C6Automatic transmission
C7Instrument panel
C8Climate control system fresh air blower
C9Windshield wiper control module
C10Dynamic steering
C11Engine start
C122018-2019: Not Used;
2020: Automatic transmission
from 2021: Automatic transmission fluid pump
Fuse panel D (black)
D1Front seat heating
D2Windshield wipers
D3Left headlight electronics
D4Panoramic glass roof
D5Left front door control module
D6Sockets
D7Right rear door control module
D8All-wheel drive control module (quattro)
D9Right headlight electronics
D10Windshield washer system/headlight washer system
D11Left rear door control module
D12Parking heater
Fuse panel E (brown)
E12018-2019: Seat ventilation, seat heating, rearview mirror, climate control system, rear climate control system controls;
from 2020: Seat ventilation, seat electronics, rearview mirror, rear climate control panel, diagnostic connector, traffic information antenna (TMC)
E22018-2019: Climate control system;
from 2020: Vehicle electrical system control module, gateway control module
E3Sound actuator/exhaust sound tuning
E4Transmission heating valve
E5Engine start
E7from 2021: Active accelerator pedal
E82018-2019: Night vision assist;
from 2020: Night vision assist, active roll stabilization
E92018-2019: Adaptive cruise assist;
from 2020: Adaptive cruise assist, front radar
E11Intersection assistant, driver assist systems

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Luggage Compartment Fuse Box

Trunk fuse box diagram: Audi A6 / S6 (2018, 2019, 2020...)

Assignment of the fuses in the trunk

№Description
Fuse panel A (black)
A1from 2021: Thermal management
A3Passenger’s side rear safety belt tensioner
A4Driver’s side rear safety belt tensioner
A5Air suspension
A6Automatic transmission
A7Rear sliding sunroof, rear spoiler
A8Rear seat heating
A92018-2019: Central locking, tail lights;
2020: Left tail light
from 2021: Convenience system control module, left tail light
A10Front belt tensioner on driver’s side
A112018-2019: Central locking, rear blind;
2020: Luggage compartment lid central locking, fuel filler door, luggage compartment cover
from 2021: Luggage compartment lid central locking, fuel filler door, sunshade, luggage compartment cover
A12Luggage compartment lid control module
Fuse panel B (red)
B12018-2019: Not Used;
from 2020: Suspension stabilization control module
B22018-2019: Not Used;
from 2020: Service disconnect switch
B42018-2019: Not Used;
2020: Electric motor
from 2021: Electric drive system, power electronics
B52018-2020: Brake system
from 2021: Brake system, brake booster
B62018-2019: Not Used;
from 2020: High-voltage battery water pump
B72018-2019: Not Used;
2020: Hybrid remote-controlled interior climate control
from 2021: Auxiliary climate control
B82018-2019: Not Used;
2020: Hybrid A/C compressor
from 2021: Climate control system compressor
B9Auxiliary battery control module
B102018-2019: Not Used;
from 2020: Hybrid high-voltage battery
B112018-2019: Not Used;
from 2020: Hybrid charger
B142018-2019: Not Used;
from 2020: Thermomanagement, water pump
B152018-2019: Not Used;
from 2020: Thermomanagement control module
B162018-2019: Not Used;
from 2020: Gateway
Fuse panel C (brown)
C1Driver assist systems control module
C22018-2020: Audi phone box, roof antenna
from 2021: Audi phone box
C32018-2019: Right front lumbar support;
2020-2021: Front seat electronics, right lumbar support
from 2022: Right lumbar support
C4Side assist
C52018-2019: Not Used;
2020-2021: Rear climate control system control panel
from 2022: Rear Seat Remote
C6Tire pressure monitoring system
C7Emergency call system
C82018-2019: Not Used;
from 2020: Parking heater radio receiver, fuel tank monitoring
C9Automatic transmission selector lever
C102018-2019: TV tuner;
from 2020: TV tuner, data exchange and telematics control module
C11Vehicle opening/start (NFC)
C12Garage door opener
C13Rearview camera, peripheral cameras
C14Central locking, tail lights
C16Front belt tensioner on front passenger’s side
Fuse panel D (black)
D1-D16Not assigned
Fuse panel E (red)
E2from 2021: Exterior antenna
E32018-2019: Exhaust treatment;
from 2020: Exhaust treatment, sound actuator, AC socket
E4Rear climate control system control panel
E52018-2020: Right trailer hitch light
from 2021: Right trailer hitch light, right rear seat adjustment
E72018-2019: Trailer hitch;
from 2020: Trailer hitch release
E82018-2020: Left trailer hitch light
from 2021: Left trailer hitch light, right rear seat adjustment
E92018-2021: Trailer hitch socket
from 2022: Trailer hitch socket, high-voltage battery
E10All-wheel drive sport differential
E11Exhaust treatment
E122018-2019: Not Used;
from 2020: 48 V generator

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