Audi A4 & S4 (2017 – 2025) Fuse Box Location & Diagrams
This blog covers 2017–2025 Audi A4 and S4 fuse box schematics and locations. Get precise fuse panel layouts, fuse assignments, and essential details to easily troubleshoot and fix Audi electrical issues.
Fuse Box Locations
Passenger Compartment Fuse Box
Driver’s/front passenger’s footwell
Left-hand drive vehicles: It is located under the footrest.
Right-hand drive vehicles: Behind the cover under the glove box.
Driver’s side cockpit
Luggage Compartment Fuse Box
It is located on the left side of the trunk behind the trim panel.
Fuse Box Diagrams
Passenger Compartment Fuse Box
Driver’s/front passenger’s footwell
LHD
RHD
| Number | Electric equipment |
|---|---|
| Brown panel A | |
| 1 | — 2020-2025: Catalytic converter heating |
| 2 | 2017: Mass airflow sensor, camshaft adjustment Mass airflow sensor, camshaft adjustment, charge air cooler pump 2020-2025: Engine components |
| 3 | Exhaust doors, fuel injectors, radiator inlet 2020-2025: Exhaust doors, fuel injectors, air intake, motor heating |
| 4 | Vacuum pump, hot water pump, particulate sensor, biodiesel sensor 2020-2025: Vacuum pump, hot water pump, NOx sensor, particulate sensor, biodiesel sensor, exhaust doors |
| 5 | Brake light sensor |
| 6 | Engine valves, camshaft adjustment |
| 7 | Heated oxygen sensor, mass airflow sensor 2020-2025: Heated oxygen sensors, mass airflow sensor, water pump |
| 8 | Water pump, high-pressure pump, high-pressure regulator valve 2020-2025: Water pump, high pressure pump, high pressure regulator valve, temperature valve, engine mount |
| 9 | Hot water pump 2020: Hot water pump, engine relay |
| 10 | Oil pressure sensor, oil temperature sensor |
| 11 | Clutch pedal position sensor 2020-2025: Clutch position sensor, 48 V starter generator, water pump, 12V starter generator |
| 12 | Engine valves |
| 13 | Radiator fan 2020-2025: Engine cooling |
| 14 | Fuel injectors 2020-2025: Fuel injectors, drive system control module |
| 15 | Ignition coils 2020-2025: Ignition coils, heated oxygen sensors |
| 16 | Fuel pump |
| Red panel B | |
| 1 | Anti-theft alarm system |
| 2 | Engine control module |
| 3 | Lumbar support 2020-2025: Left front seat electronics, lumbar support, massaging seat |
| 4 | Automatic transmission selector mechanism |
| 5 | Horn |
| 6 | Electromechanical park ing brake 2020-2022: Parking brake |
| 7 | Gateway control module |
| 8 | Interior headl iner lights 2020-2025: Roof electronics control module |
| 9 | — 2020-2025: Emergency call and communication control module |
| 10 | Airbag control module |
| 11 | Electronic Stabilization Control (ESC) |
| 12 | Diagnostic connector, light/rain sensor 2023-2025: Diagnostic connection, Electronic Toll Collection System (ETC), Light/rain sensor |
| 13 | Climate control system |
| 14 | Right front door control module |
| 15 | A/C compressor |
| 16 | 2021-2025: Brake system pressure reservoir |
| Black panel C | |
| 1 | Front seat heating |
| 2 | Windshield wipers |
| 3 | Left head light electronics |
| 4 | Panorama glass roof/ sliding/tilting sunroof |
| 5 | Left front door control module |
| 6 | Sockets |
| 7 | Right rear door control module 2020-2025: Right rear door control module, right rear power window |
| 8 | 2017: – All wheel drive |
| 9 | Right headlight electronics |
| 10 | Windshield washer system/headlight washer system 2020-2025: Windshield washer system/headlight washer system control module |
| 11 | Left rear door control module |
| 12 | 2020-2025: Parking heater |
| Black panel D | |
| 1 | Seat ventilation, rearv iew mirror, rear climate control system controls 2020-2025: Front seat electronic, seat ventilation, rearview mirror, rear climate control system control panel, windshield heating, diagnostic connection |
| 2 | Gateway, climate control system 2020-2025:Diagnostic interface, vehicle electrical system control module |
| 3 | Sound actuator/exhaust sound tuning 2020-2025: Sound generator |
| 4 | Clutch pedal position sensor |
| 5 | Engine start 2020-2023: Engine start, emergency shut-off |
| 6 | — 2020-2025: Diagnostic connection, traffic information antenna (TMC) |
| 7 | 2017: – Rear USB charg ing port |
| 8 | 2018: Homelink 2019-2025: Garage Door Opener |
| 9 | Audi adaptive cruise control 2020-2023: Audi adaptive cruise control, adaptive distance regulation |
| 10 | — |
| 11 | Video camera |
| 12 | Matrix LED headlight/right LED headlight |
| 13 | Matrix LED headlight/left LED headlight |
| 14 | Rear window wiper 2020-2025: Transmission fluid cooling |
| 15 16 | 2020: Alarm and hands-free calling system 2019: Rear seat Entertainment Prepraion |
| Red panel E | |
| 1 | Ignition coils |
| 2 | Natural gas tank valves 2020-2025: Climate control system compressor |
| 3 | — |
| 4 | — |
| 5 | Engine mount 2020-2025: Left headlight |
| 6 | Automatic transmission |
| 7 | Instrument panel |
| 8 | Climate control system (blower) |
| 9 | — 2020-2025: Right headlight |
| 10 | Dynamic steering |
| 11 | Engine start |
Driver’s side cockpit
| Number | Electric equipment |
|---|---|
| 1 | 2018: — 2019: Vehicle opening/start (NFC) 2020-2025: Convenience access and start authorization control module (NFC) |
| 2 | Telephone 2020-2025: Audi phone box, USB connection |
| 3 | — |
| 4 | Head-up display |
| 5 | 2017: Audi music interface Audi music interface, USB charging port 2023-2025: USB ports with charging function |
| 6 | Front climate control system controls |
| 7 | Steering column lock |
| 8 | Infotainment system display |
| 9 | Instrument cluster |
| 10 | Infotainment unit 2020-2025: Volume control |
| 11 | Light switch |
| 12 | Steering column electronics |
| 13 | — 2020: Particulate matter sensor for climate control system |
| 14 | Infotainment system |
| 15 | — |
| 16 | Steering wheel heating 2021-2025: Steering column electronics, steering wheel heating |
Luggage Compartment Fuse Box
| Number | Electric equipment |
|---|---|
| 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 | Tail lights |
| 10 | Left safety belt tensioner 2020-2025: Airbag, driver’s side safety belt tensioner control module |
| 11 | Central locking system 2020-2025: Luggage compartment lid lock, fuel filler door lock, convenience system control module |
| 12 | Electric luggage compartment lid |
| Red panel B | |
| — | Not assigned |
| 6 | 2020: Battery power interrupt 2021-2025: Electric compressor |
| Brown panel C | |
| 1 | — 2021-2025: Exterior antenna |
| 2 | Telephone 2020-2025: Audi phone box |
| 3 | Lumbar support 2020-2025: Right front seat electronics, lumbar support, massaging seat |
| 4 | Audi side assist |
| 5 | 2018: — 2019: Rear Seat Entertainmentpreparation |
| 6 | — 2020-2025: Tire pressure monitoring system |
| 7 | 2018: — 2019: Vehicle opening/start (NFC) 2020-2025: Convenience access and start authorization control module (NFC) |
| 8 | 2017: – 2018-2019: Smart module (tank) 2020-2022: Auxiliary heating, tank module |
| 9 | — |
| 10 | — 2020-2023: TV tuner, data exchange and telematics control module |
| 11 | 2017: – 2018: 12 Volt battery 2019-2025: Auxiliary battery control module |
| 12 | 2018: Homelink 2019-2025: Garage door opener |
| 13 | Rearview camera, peripheral cameras |
| 14 | Right tail lights |
| 15 | — |
| 16 | Right safety belt tensioner 2020-2025: Airbag, front passenger’s side safety belt tensioner control module |
| Red panel E | |
| 1 | — |
| 2 | Sound-amplifier |
| 3 | 2017: AdBlue 2018-2019: AdBlue heating 2020-2025: Exhaust treatment |
| 4 | — |
| 5 | Trailer hitch (right light) |
| 6 | — |
| 7 | Trailer hitch |
| 8 | Trailer hitch (left light) |
| 9 | Trailer hitch (socket) |
| 10 | Sport differential 2020-2025: All Wheel Drive control module, sport differential |
| 11 | Ad Blue heating 2020-2025: Exhaust treatment |
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