Audi A3 and S3 8Y (2020-2021…) – fuse box

Audi A3 and S3 8Y – fuse box diagram

Year of production: 2020, 2021.

The fuse for the cigarette lighter / power socket on the Audi A3 and S3 8Y is fuse No. F40 in the fuse box in the passenger compartment.

Color [Amperes]

  • Black [1]
  • Violet [3]
  • Light brown [5]
  • wholemeal [15]
  • Red [10]
  • Blue [15]
  • Yellow [20]
  • White or transparent [25]
  • Green [30]
  • Orange [40]


Fuse box in the passenger compartment


Number Description
F1 Engine components, AdBlue
F2 Seat adjustment
F4 Infotainmentl control panel;

Infotainment ingredients.

F5 CAN module
F6 Gear lever (automatic gearbox);

Steering wheel lock.

F7 Air conditioning and heating control;

Parking heating;

Rear window defogger;

Tire pressure monitor.

F8 Electromechanical parking brake switch;

Light switch;

Rain and light sensor;

Anti-theft alarm system;

Diagnostic connector;

Roof module;

Emergency call system;

Headlamp range control.

F9 Steering column electronics
F10 Infotainment system display
F11 Left vehicle electrical control module
F12 Elements of the infotainment system
F13 Driver’s seat belt pretensioner;


F14 Heating and air conditioning blower control
F15 Electronic steering column lock;

Convenience access control module.

F16 Television tuner;

Telephone antenna.

F17 Instrument cluster (controls)
F18 Rear camera
F19 Vehicle positioning
F20 Engine components;


Charging system.

F21 Steering column;

Steering wheel heating switch module.

F24 Right vehicle electrical control module
F25 Electric front and rear windows on the driver’s side
F26 Seat heating
F27 Vehicle electrical system control module
F28 Top power control module
F29 Vehicle electrical system control module;

Indoor lighting.

F30 Diagnostic connector
F32 Front camera;

Parking system;

ACC sensor;

Lane change assistant.

F33 Airbag
F34 Auto Hold buttons (hill brake);

Internal sound;

Reverse light switch;

Temperature sensor;

Heating neck and power sockets;

Top power button.

F35 Air quality sensor;

Automatic dimming rear view mirror;

Diagnostic connector;

Center console power supply .

F36 Right headlight (LED, Matrix LED)
F37 Left headlight (LED, Matrix LED)
F38 High voltage battery
F39 Electric side windows front and rear on the passenger side
F40 Lighter;

Power socket.

F41 Seat belt pretensioner on the passenger side
F42 Central lock
F44 All-wheel drive
F45 Lateral adjustment of the driver’s seat
F47 Rear window wiper
F48 External engine sound
F49 Clutch sensor;

Starting the engine;

High voltage battery;

Power electronics.

F52 Level control system control module
F53 Rear window defogger
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Fuse box in the engine compartment


Number Description
F3 Engine control module
F4 Engine components;

Engine cooling;

Auxiliary heater;

Exhaust gas treatment.

F5 Engine components;

Fuel tank system (diesel);

CNG shut-off valve.

F6 Brake light switch
F7 Engine components;

Water pump;

Tank system (gasoline engine);


F8 Oxygen heating sensor
F9 Engine components;

Exhaust doors;

Glow time control module.

F10 Fuel control module;

Fuel pump.

F13 Transmission fluid pump
F15 Horn
F16 Power and control electronics;

Engine components;

The ignition coil;

Option module.

F17 Electronic Stability Control (ESC);

Engine control module.

F18 Terminal 30 (reference voltage);

Battery monitoring.

F19 Wipers
F20 Anti-theft alarm system
F21 Automatic Transmission
F22 Terminal 50 diagnosis;

Engine control module.

F23 Starting the engine
F31 Vacuum pump;

The water pump;

High pressure pump;

Fuel injectors.

F33 Brake pressure reservoir;


F34 Brake servo
F35 Air conditioning system
F36 Left front headlight
F37 Auxiliary heating
F38 Left front headlight
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