Audi A4 / S4 (B9 / 8W; 2020-2022) fuses

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In this article, we consider the fifth-generation Audi A4 / S4 (B9/8W) (facelifted), produced from 2019 to the present. Here you will find fuse box diagrams of Audi A4 and S4 2020, 2021, 2022, get information about the location of the fuse panels inside the car, and learn about the assignment of each fuse (fuse layout).

Fuse Layout Audi A4 / S4 2020-2022

Audi A4 / S4 (B9 / 8W; 2020-2022)

Fuse Box Location

Driver’s/front passenger’s footwell

The fuses are located in the footwell under the foot rest (left-hand drive vehicle) or behind the cover (right-hand drive vehicle).The location of the fuses in the passenger compartment: Audi A4/S4 (2020, 2021, 2022)

Instrument panel

Additional fuses are located on the front side of the cockpit (driver’s side).The location of the fuses in the passenger compartment: Audi A4/S4 (2020, 2021, 2022)

Luggage Compartment

The fuses are located under the left cover in the luggage compartment.The location of the fuses in the trunk: Audi A4/S4 (2020, 2021, 2022)


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Fuse Box Diagrams

Driver’s/front passenger’s footwell

LHDInterior fuse box diagram (RHD): Audi A4/S4 (2020, 2021, 2022)

RHDInterior fuse box diagram (LHD): Audi A4/S4 (2020, 2021, 2022)

Assignment of the fuses in the front passenger footwell
Equipment
Panel A (brown)
1Catalytic converter heating
2Engine components
3Exhaust doors, fuel injectors, air intake, motor heating
4Vacuum pump, hot water pump, NOx sensor, particulate sensor, biodiesel sensor, exhaust doors
5Brake light sensor
6Engine valves, camshaft adjustment
7Heated oxygen sensors, mass airflow sensor, water pump
8Water pump, high pressure pump, high pressure regulator valve, temperature valve, engine mount
92020: Hot water pump, engine relay
2021-2022: Hot water pump, motor relay, 48 V starter generator, 48 V water pump
10Oil pressure sensor, oil temperature sensor
11Clutch position sensor, 48 V starter generator, water pump, 12V starter generator
12Engine valves, engine mount
13Engine cooling
14Fuel injectors, drive system control module
15Ignition coils, heated oxygen sensors
16Fuel pump
Panel B (red)
1Anti-theft alarm system
2Drive system control module
3Left front seat electronics, lumbar support, massaging seat
4Automatic transmission selector lever
5Horn
6Parking brake
7Diagnostic interface (Gateway control module)
8Roof electronics control module
9Emergency call and communication control module
10Airbag control module
11Electronic Stabilization Control (ESC), Anti-Lock Braking System (ABS)
12Diagnostic connection, light/rain sensor
13Climate control system
14Right front door control module
15Climate control system compressor
162021-2022: Brake system pressure reservoir
Panel C (black)
1Front seat heating
2Windshield wipers
3Left headlight electronics
4Panoramic glass roof / sliding/tilting sunroof
5Left front door control module
612 volt socket
7Right rear door control module, right rear power window
8All wheel drive (AWD) control module
9Right headlight electronics
10Windshield washer system/headlight washer system control module
nLeft rear door control module, left rear power window
12Parking heater
Panel D (black)
1Front seat electronic, seat ventilation, rearview mirror, rear climate control system control panel, windshield heating, diagnostic connection
2Diagnostic interface, vehicle electrical system control module
3Sound generator
4Clutch position sensor
5Engine start, emergency shut-off
6Diagnostic connection, traffic information antenna (TMC)
7USB connection
8Garage door opener
9Audi adaptive cruise control, adaptive distance regulation
11Front camera
12Right headlight
13Left headlight
14Transmission fluid cooling
152020: Alarm and hands-free calling system
Panel E (red)
1Ignition coils
2Climate control system compressor
5Left headlight
6Automatic transmission
7Instrument panel
8Climate control system blower
9Right headlight
10Dynamic steering
11Engine start

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Instrument panel

Instrument panel fuse box diagram: Audi A4/S4 (2020, 2021, 2022)

Assignment of the fuses in the driver's side of the cockpit
Equipment
1Convenience access and start authorization control module (NFC)
2Audi phone box, USB connection
4Head-up display
5Audi music interface, USB connection
6Front climate control system control panel
7Steering column lock
8Center display
9Instrument cluster
10Volume control
11Light switch, switch module
12Steering column electronics
132020: Particulate matter sensor for climate control system
14Infotainment system
162020: Steering wheel heating
2021-2022: Steering column electronics, steering wheel heating

Luggage Compartment

Trunk fuse box diagram: Audi A4/S4 (2020, 2021, 2022)

Assignment of the fuses in the trunk
Equipment
Panel A (black)
2Windshield defroster
3Windshield defroster
5Suspension control
6Automatic transmission
7Rear window defogger
8Rear seat heating
9Left tail lights
10Airbag, driver's side safety belt tensioner control module
11Luggage compartment lid lock, fuel filler door lock, convenience system control module
12Luggage compartment lid
Panel B (red)
62020: Battery power interrupt
2021-2022: Electric compressor
Panel C (brown)
12021-2022: Exterior antenna
2Audi phone box
3Right front seat electronics, lumbar support, massaging seat
4Side assist
6Tire pressure monitoring system
7Convenience access and start authorization control module (NFC)
8Auxiliary heating, tank module
10TV tuner, data exchange and telematics control module
11Auxiliary battery control module
12Garage door opener
13Rearview camera, peripheral cameras
14Right tail lights
16Airbag, front passenger's side safety belt tensioner control module
Panel E (red)
3Exhaust treatment
5Right trailer hitch light
7Trailer hitch
8Left trailer hitch light
9Trailer hitch socket
10All wheel drive control module, sport differential
11Exhaust treatment