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Audi A4 and S4 B9/8W (2020-2021) fuse box

Audi A4 and S4 B9/8W (2020-2021) fuse box

Posted on July 31, 2022

Audi A4 and S4 B9/8W – fuse box diagram

Year of manufacture: 2020, 2021.

Cigarette lighter / electrical socket fuse in Audi A4 and S4. is fuse No. 6 (black fuse panel C) in the fuse box in the driver / passenger legroom.

Color Amps [A]
Black 1
Purple 3
Light brown 5
Brown 7,5
Red 10
Blue 15
Yellow 20
White or transparent 25
Green 30
Orange 40

Location of fuse box

Driver or front passenger legroom.

Vehicles with steering wheel on left side: Located under the footrest.
Vehicles with the steering wheel on the right side: Behind the cover under the glove box.

Driver side fuse box

Luggage compartment

Located on the left side of the trunk behind the trim panel.

Fuse box diagrams

2020

Driver’s legroom (steering wheel on right side)

Front passenger legroom (steering wheel on right side)

Assignment of fuses in the passenger compartment

Number Description
Brown panel A
1 –
2 Engine components
3 Exhaust doors;

Fuel injectors;

Radiator inlet;

Crankcase cover heater.

4 Vacuum pump;

Hot water pump;

NOx sensor;

Particulate sensor;

Biodiesel sensor;

Exhaust door.

5 Brake light sensor
6 Engine Valves;

Camshaft adjustment

7 Heated oxygen sensor;

Mass airflow sensor;

Water pump.

8 Water pump;

High pressure pump;

High pressure control valve;

Temperature valve;

Engine mount.

9 Hot water pump;

Motor relay.

10 Oil pressure sensor;

Oil temperature sensor.

11 Clutch pedal position sensor;

Engine start;

Water pump.

12 Engine Valves;

Engine assembly.

13 Radiator fan
14 Fuel injectors;

Engine control module.

15 Ignition coils;

Heated oxygen sensor.

16 Fuel pump
Red panel B.
1 Anti-theft alarm system
2 Engine control module
3 Lumbar support;

Left front seat electronics;

Seat massage.

4 Automatic transmission selection mechanism
5 Horn
6 Electromechanical parking brake
7 Gate control module
8 Overhead electronic control module
9 Emergency call system
10 Airbag control module
11 Electronic stability control (ESC)
12 Diagnostic connector;

Light and rain sensor.

13 Air conditioning, heating and ventilation control system
14 Right front door control module
15 A/C compressor
Black C panel
1 Front seat heating
2 Windshield wipers
3 Left headlight electronics
4 Panoramic glass roof/sliding/tilting roof
5 Left front door control module
6 Sockets
7 Right rear door control module
8 AWD control module
9 Right headlight electronics
10 Windshield washers;

Headlight washers.

11 Left rear door control module
12 Parking heater
Black panel D
1 Front seat electronics;

Seat ventilation;

Rear view mirror;

Rear air conditioning, heating and ventilation control system;

Windshield defogger;

CAN diagnostics.

2 CAN gateway

Control system for air conditioning, heating and ventilation.

3 Exhaust sound tuning;

Sound actuator.

4 Clutch pedal position sensor
5 Engine start;

Emergency shutdown.

6 CAN gateway
7 USB charging port
8 Homelink (garage door opener)
9 Adaptive Cruise Control;

Distance control.

10 –
11 Video camera
12 Matrix LED headlight and right LED headlight
13 Matrix LED headlight and left LED headlight
14 Transmission fluid cooling valve
15 Alert;

Hands-free kit.

E red panel.
1 Ignition coils
2 Compressor clutch, CNG system
3 –
4 –
5 Left headlight
6 Automatic transmission
7 Instrument panel
8 Air conditioning system (fresh air blower)
9 Right headlight
10 Dynamic control
11 Engine start

Driver side cockpit

Driver-side cockpit fuse assignment

Number Description
1 Vehicle opening and starting (NFC).
2 Audi Phonebox;

USB port.

3 –
4 Head-up display
5 Audi music interface;

USB charging port.

6 Front air conditioning controls
7 Steering column lock
8 Central display
9 Instrument cluster
10 Volume control
11 Light switch
12 Steering column electronics
13 Particulate matter sensor for air conditioning system
14 Infotainment system
15 –
16 Steering wheel heating;

Steering column electronics.

Left side of the trunk

Trunk fuse allocation

Number Description
Black panel A
1 –
2 Windshield defroster
3 Windshield defroster
4 –
5 Suspension control
6 Automatic transmission
7 Rear window defogger
8 Rear seat heating
9 Rear lights on the left side
10 Airbag module
11 Electric trunk lid;

Fuel filler flap;

Comfort system control module.

12 Electric trunk lid lock;

Fuel filler flap.

13 Electric trunk lid.
Panel red B.
6 Electric compressor
Brown panel C
1 External antenna
2 Audi Phonebox
3 Lumbar support;

Right front seat electronics;

Seat massage.

4 Audi Side Assist
5 –
6 Tire pressure monitor
7 Opening and starting the vehicle (NFC)
8 Parking heater radio receiver;

Smart module (fuel tank).

9 –
10 TV Tuner;

CAN gateway.

11 Auxiliary battery module
12 Homelink (garage door opener)
13 Reversing camera;

Peripheral cameras.

14 Right taillights
15 –
16 Airbag module;

Right seat belt pretensioner.

E red panel.
1 –
2 –
3 AdBlue
4 –
5 Trailer hitch (right light)
6 –
7 Towing hook
8 Trailer hitch (left light)
9 Trailer hitch (socket)
10 Sport differential
11 Exhaust gas treatment, AdBlue

2021

Driver’s legroom (right side steering wheel)

Front passenger legroom (steering wheel on right side)

Assignment of fuses in the passenger compartment

Number Description
Brown panel A
1 Catalyst heating
2 Engine components
3 Exhaust doors;

Fuel injectors;

Radiator inlet;

Crankcase cover heater.

4 Vacuum pump;

Hot water pump;

NOx sensor;

Particulate sensor;

Biodiesel sensor;

Exhaust door.

5 Brake light sensor
6 Engine Valves;

Camshaft adjustment

7 Heated oxygen sensor;

Mass airflow sensor;

Water pump.

8 Water pump;

High pressure pump;

High pressure control valve;

Temperature valve;

Engine mount.

9 Hot water pump;

Motor relay.

48 volt drive train generator;

48V water pump.

10 Oil pressure sensor;

Oil temperature sensor.

11 Clutch pedal position sensor;

Engine start;

Water pump;

48 volt drive train generator;

12 volt drive train generator.

12 Engine Valves;

Engine assembly.

13 Engine cooling
14 Fuel injectors;

Engine control module.

15 Ignition coils;

Heated oxygen sensor.

16 Fuel pump
Red panel B.
1 Anti-theft alarm system
2 Engine control module
3 Lumbar support;

Left front seat electronics;

Seat massage.

4 Automatic transmission selection mechanism
5 Horn
6 Electromechanical parking brake
7 CAN gate control module
8 Overhead electronic control module
9 Emergency call system
10 Airbag control module
11 Electronic stability control (ESC);

ABS.

12 Diagnostic connector;

Light and rain sensor.

13 Air conditioning, heating and ventilation control system
14 Right front door control module
15 A/C compressor
16 Brake system pressure reservoir
Black panel C
1 Front seat heating
2 Windshield wipers
3 Left headlight electronics
4 Panoramic glass roof/sliding/tilting roof
5 Left front door control module
6 Sockets
7 Right rear door control module;

Right rear window actuator.

8 AWD (4-wheel drive) control module.
9 Right headlight electronics
10 Windshield washers;

Headlight washers.

11 Left rear door control module
12 Parking heater
Black panel D
1 Front seat electronics;

Seat ventilation;

Rear view mirror;

Rear air conditioning, heating and ventilation control system;

Windshield defogger;

CAN diagnostics.

2 CAN gateway;

Air conditioning, heating and ventilation control system.

3 Sound generator
4 Clutch pedal position sensor
5 Engine start;

Emergency shutdown.

6 CAN gateway;

Traffic jam information system (TMC).

7 USB charging port
8 Homelink (garage door opener)
9 Adaptive Cruise Control;

Distance control.

10 –
11 Video camera
12 Matrix LED headlight and right LED headlight
13 Matrix LED headlight and left LED headlight
14 Transmission fluid cooling valve
15 Alert;

Hands-free kit.

E red panel.
1 Ignition coils
2 A/C compressor
3 –
4 –
5 Left headlight
6 Automatic transmission
7 Instrument panel
8 Air conditioning system (fresh air blower)
9 Right headlight
10 Dynamic control
11 Engine start

Driver side cockpit

Driver-side cockpit fuse assignment

Number Description
1 Vehicle opening and starting (NFC).
2 Phone;

Mobile device charger.

3 –
4 Head-up display
5 Audi music interface;

USB charging port.

6 Front air conditioning controls
7 Steering column lock
8 Infotainment system display
9 Instrument cluster
10 Infotainment unit
11 Light switch
12 Steering column electronics
13 Particulate matter sensor for air conditioning system
14 Infotainment system
15 –
16 Steering wheel heater

Left side of the trunk

Trunk fuse allocation

Number Description
Black panel A
1 –
2 Windshield defroster
3 Windshield defroster
4 –
5 Suspension control
6 Automatic transmission
7 Rear window defogger
8 Rear seat heating
9 Rear lights on the left side
10 Airbag module
11 Central locking system
12 Electric trunk lid;

Fuel filler flap.

Red panel B.
6 Electric compressor;

Battery power cutoff.

Brown panel C
1 –
2 Phone;

Mobile device charging function – USB.

3 Lumbar support;

Right front seat electronics;

Seat massage.

4 Audi Side Assist
5 –
6 Tire pressure monitor
7 Opening and starting the vehicle (NFC)
8 Parking heater radio receiver;

Smart module (fuel tank).

9 –
10 TV Tuner;

CAN gateway.

11 Auxiliary battery module
12 Homelink (garage door opener)
13 Reversing camera;

Peripheral cameras.

14 Right taillights
15 –
16 Airbag system
E red panel.
1 –
2 –
3 AdBlue
4 –
5 Trailer hitch (right light)
6 –
7 Towing hook
8 Trailer hitch (left light)
9 Trailer hitch (socket)
10 Sport differential;

4-wheel drive.

11 Exhaust gas treatment, AdBlue

 

The article Audi A4 and S4 B9/8W (2020-2021) – fuse box comes from the site Fuseów schematics.

Related posts:

  1. Audi A4 and S4 B9/8W (2022) fuse box
  2. Audi A4 and S4 (B5) (1994-2001) – fuse box
  3. Audi A4/S4 (B8/8K) (2008-2016) – fuse box
  4. Audi A4 and S4 B9/8W (2017-2019) fuse box
  5. Audi A4 Allroad B8 (2009 and above) – batteries
See also  Audi A6/S6 C7/4G (2012-2018) - fuse box

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