Audi A3 & S3 (2021 – 2026) Fuse Box Location & Diagrams
The Audi A3 & S3 (2021–2026) features multiple fuse boxes that protect essential electrical systems. Finding the correct fuse location helps diagnose electrical issues and safely replace blown fuses. This article provides fuse box locations, diagrams, and fuse assignments for every supported model year.
Fuse Box Location
Passenger Compartment Fuse Box
LHD vehicles: Depending on the vehicle equipment, the fuses may be located behind a cover (1) or behind the storage compartment (2) in the area of the steering column.
RHD vehicles: The fuses are located behind a cover in the glove compartment.
Engine Compartment Fuse Box
Fuse Box Diagrams
Passenger Compartment Fuse Box
| № | Equipment |
|---|---|
| 3 | Trailer hitch |
| 4 | Drive components, exhaust treatment |
| 5 | 2021-2023: Automatic transmission selector lever 2024-2026: Automatic transmission selector lever, parking lock |
| 6 | Vehicle electrical system control module |
| 7 | Seat heating controls, electrical system control module |
| 8 | Panoramic glass roof |
| 9 | Control module for front driver’s side door, rear driver’s side power window |
| 11 | Trailer hitch |
| 12 | Vehicle electrical system control module |
| 13 | Vehicle electrical system control module |
| 14 | Sound system |
| 16 | Airbag control module |
| 17 | 2021-2024: Exhaust treatment |
| 18 | Steering column lock, convenience access and start authorization control module |
| 19 | Instrument cluster, emergency call module |
| 20 | 2021-2023: Infotainment system, USB input 2025-2026: USB connections, Infotainment system, Electronic Toll Collection System (ETC), Audi phone box, transceiver |
| 21 | Driver assistance systems control module, camera systems, side assist, luggage compartment lid |
| 22 | 2025-2026: Driver assistance systems |
| 23 | Front passenger’s side lumbar support |
| 24 | All wheel drive control module |
| 25 | Left front safety belt tensioner |
| 26 | Front passenger’s side door control module, rear passenger’s side power window |
| 27 | Right front safety belt tensioner |
| 28 | High-voltage battery emergency cut-off point |
| 29 | Trailer hitch |
| 30 | Infotainment system |
| 31 | Trailer hitch |
| 33 | Front driver’s side lumbar support |
| 35 | Vehicle electrical system control module |
| 36 | Climate control system blower |
| 37 | Luggage compartment lid control module |
| 39 | Steering column electronics |
| 40 | Anti-theft alarm system |
| 41 | Diagnostic interface |
| 42 | Automatic transmission selector lever |
| 43 | Tire pressure monitoring, climate control system controls, auxiliary heating, interior temperature sensor, rear window heater relay |
| 44 | Particulate matter sensor, roof electronics control module, parking brake button, anti-theft alarm, diagnostic connection, headlight range control, garage door opener control module, light switch, light/ rain sensor |
| 45 | Steering column electronics |
| 46 | Volume control, center display, head-up display |
| 47 | Suspension control |
| 48 | USB input |
| 52 | 12 volt socket |
| 58 | Driver assistance systems control module, front camera, parking aid |
| 59 | Climate control system, exterior sound, rearview mirror, back-up light switch, center console switch panel, air quality sensor, 12 volt socket relay |
| 60 | Diagnostic connection |
| 61 | Clutch position sensor, electric drive system, high-voltage battery |
| 64 | 2021-2024: Passenger’s side passenger occupant detection system, passenger’s airbag OFF warning light 2025-2026: Roof electronics control unit |
| 65 | 2021-2024: Exterior sound |
| 66 | Rear window wiper |
| 67 | Rear window defogger |
Engine Compartment Fuse Box
| № | Equipment |
|---|---|
| 2 | 2021-2024: Drive system control module, Electronic Stabilization Control (ESC), Anti-Lock Braking System (ABS) 2025-2026: Drive system control unit, electronic stabilisation control (ESC), anti-lock brake system (ABS), starter-alternator |
| 3 | Motor components, fuel pump, climate control system, high-voltage charger, electric drive system |
| 4 | Left headlight |
| 5 | Right headlight |
| 7 | Transmission fluid cooling |
| 8 | Brake booster |
| 9 | Horn |
| 10 | Windshield wipers |
| 11 | Climate control system |
| 12 | Transmission control module |
| 13 | Electronic Stabilization Control (ESC), Anti-Lock Braking System (ABS) |
| 14 | Auxiliary heating, sound actuator |
| 15 | 2021-2024: Electronic Stabilization Control (ESC), Anti-Lock Braking System (ABS) |
| 16 | Automatic transmission |
| 17 | Exhaust treatment, climate control, auxiliary heating |
| 18 | Climate control, auxiliary heating |
| 21 | Drive system control module |
| 22 | Engine start |
| 23 | Drive system control module |
| 24 | Engine components, diesel module, exhaust treatment, fuel leak diagnosis, oil level and oil temperature sensor, engine cooling |
| 25 | Engine components, exhaust treatment |
| 26 | Engine components, exhaust doors, fuel leak diagnosis, engine cooling, transmission fluid cooling, exhaust treatment |
| 27 | Heated oxygen sensors |
| 28 | Engine components |
| 29 | 2021-2024: Fuel pump, transmission control module 2025-2026: Fuel pump |
| 30 | 2021-2023: Engine cooling 2024-2026: Engine cooling, exhaust flaps |
| 33 | Climate control, auxiliary heating |
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