Table of Contents
The Audi A3 is a premium compact hatchback produced since 1996. The fourth generation was introduced in March 2020. The vehicle is built on the Volkswagen Group MQB Evo platform, shared with the Volkswagen Golf Mk8, SEAT León Mk4, and Škoda Octavia Mk4. This guide provides detailed fuse box diagrams for the fourth-generation Audi A3 (MQB platform; codename 8Y), covering the 2020, 2021, 2022, 2023, and 2024 model years.
Below, you will find the locations and photographs of the power distribution centers. The fuses protecting the "12-Volt Power Outlet" (cigarette lighter) and "Fuel Pump" are highlighted in bold.
Engine Compartment
The fuse box is located on the left side of the engine compartment, beneath a protective cover.
General overview.
| Diagram | |
|---|---|
|
|
| No. | Description |
| 2 | Powertrain control module, Electronic Stability Control (ESC), Anti-lock Braking System (ABS) |
| 3 | Engine components, fuel pump, climate control system, high-voltage charger, electric drive system |
| 4 | Left headlamp |
| 5 | Right headlamp |
| 7 | Transmission fluid cooling |
| 8 | Brake booster |
| 9 | Horn |
| 10 | Windshield wiper system |
| 11 | Climate control system |
| 12 | Transmission Control Module (TCM) |
| 13 | Electronic Stability Control (ESC), Anti-lock Braking System (ABS) |
| 14 | Auxiliary heater, sound actuator |
| 15 | Electronic Stability Control (ESC), Anti-lock Braking System (ABS) |
| 16 | Automatic transmission |
| 17 | Exhaust gas aftertreatment, climate control system, auxiliary heater |
| 18 | Climate control system, auxiliary heater |
| 21 | Powertrain control module |
| 22 | Starter motor |
| 23 | Powertrain control module |
| 24 | Engine components, diesel control module, exhaust gas aftertreatment, EVAP leak detection, oil level and temperature sensor, engine cooling system |
| 25 | Engine components, exhaust gas aftertreatment |
| 26 | Engine components, exhaust flaps, EVAP leak detection, engine cooling system, transmission fluid cooling, exhaust gas aftertreatment |
| 27 | Heated oxygen sensors (HO2S) |
| 28 | Engine components |
| 29 | Fuel pump, Transmission Control Module (TCM) |
| 30 | Engine cooling system |
| 33 | Climate control system, auxiliary heater |
Passenger Compartment
The fuse box is located on the driver's side of the dashboard, behind the storage compartment.
General overview.
| Diagram | |
|---|---|
|
|
| No. | Description |
| 3 | Trailer hitch |
| 4 | Drivetrain components, exhaust gas aftertreatment |
| 5 | Automatic transmission gear selector |
| 6 | Vehicle Electrical System Control Module (BCM) |
| 7 | Seat heating controls, Vehicle Electrical System Control Module |
| 8 | Panoramic sunroof |
| 9 | Driver door control module, left rear power window control module |
| 11 | Trailer hitch |
| 12 | Vehicle Electrical System Control Module |
| 13 | Vehicle Electrical System Control Module |
| 14 | Audio system amplifier |
| 16 | Airbag control module (SRS) |
| 17 | Exhaust gas aftertreatment |
| 18 | Electronic steering column lock, Keyless Access and start authorization control module (KESSY) |
| 19 | Instrument cluster, emergency call module (eCall) |
| 20 | Infotainment system, USB ports |
| 21 | Driver assistance systems control module, camera systems, Side Assist, power tailgate |
| 23 | Front passenger seat lumbar support |
| 24 | All-Wheel Drive (AWD) control module |
| 25 | Left front seatbelt pretensioner |
| 26 | Front passenger door control module, right rear power window control module |
| 27 | Right front seatbelt pretensioner |
| 28 | High-voltage battery disconnect system (emergency cut-off) |
| 29 | Trailer hitch |
| 30 | Infotainment system |
| 31 | Trailer hitch |
| 33 | Driver seat lumbar support |
| 35 | Vehicle Electrical System Control Module |
| 36 | Climate control system blower motor |
| 37 | Power tailgate control module |
| 39 | Steering column electronics module |
| 40 | Anti-theft alarm system |
| 41 | Data link connector (OBD-II diagnostic interface) |
| 42 | Automatic transmission gear selector |
| 43 | Tire Pressure Monitoring System (TPMS), climate control panel, auxiliary heater, cabin temperature sensor, rear window defroster relay |
| 44 | Particulate matter sensor, overhead electronics control module, electronic parking brake switch, anti-theft alarm system, data link connector, headlamp range control, garage door opener (HomeLink), light switch, rain/light sensor |
| 45 | Steering column electronics module |
| 46 | Audio volume control, center display, Head-Up Display (HUD) |
| 47 | Adaptive suspension control module |
| 48 | USB ports |
| 52 | 12-volt power outlet (cigarette lighter) |
| 58 | Driver assistance systems control module, front camera, Park Assist system |
| 59 | Climate control system, exterior sound system, auto-dimming rearview mirror, taillight switch, center console switch panel, air quality sensor, 12-volt power outlet relay |
| 60 | Data link connector (OBD-II diagnostic interface) |
| 61 | Clutch position sensor, electric drive system, high-voltage battery |
| 64 | Front passenger occupant detection system (ODS), passenger airbag deactivation warning indicator |
| 65 | Exterior sound generator (Acoustic Vehicle Alerting System) |
| 66 | Rear window wiper motor |
| 67 | Rear window defroster |
