Audi A4 2020 Fuse Box Info
Passenger compartment fuse box location:
The fuse box 1 is located on the left front side of the cockpit.
The fuse box 2 is located in the driver's footwell (left-hand drive vehicle).
The fuse box 2 is located in the front passenger's footwell (right-hand drive vehicle).
Luggage compartment fuse box location:
Fuse Box Diagram | Layout
Passenger compartment fuse box 1:
| Fuse/Relay N° | Functions |
| 1 | Vehicle opening/start (NFC) |
| 2 | Telephone, mobile device charger |
| 4 | Head-up display |
| 5 | Audi music interface, USB charging port |
| 6 | Front climate control panel, Instrument panel |
| 7 | Steering column lock |
| 8 | Infotainment system display |
| 9 | Instrument cluster |
| 10 | Infotainment unit |
| 11 | Light switch, switch panel |
| 12 | Steering column electronics |
| 13 | Particulate matter sensor for climate control system |
| 14 | Infotainment system |
| 16 | Steering wheel heating |
Passenger compartment fuse box 2:
| Fuse/Relay N° | Functions |
| Fuse panel A (brown) | |
| 2 | Engine components |
| 3 | Exhaust doors, fuel injectors, radiator inlet, crankcase housing heater |
| 4 | 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, water pump |
| 8 | Water pump, high pressure pump, high pressure regulator valve, temperature valve, engine mount |
| 9 | Hot water pump, engine relay |
| 10 | Oil pressure sensor, oil temperature sensor |
| 11 | Clutch pedal position sensor, engine start, water pump |
| 12 | Engine valves, engine mount |
| 13 | Radiator fan |
| 14 | Fuel injectors, engine control module |
| 15 | Ignition coils, heated oxygen sensors |
| 16 | Fuel pump |
| Fuse panel B (red) | |
| 1 | Anti-theft alarm system |
| 2 | Engine control module |
| 3 | Left front seat electronics, lumbar support, massaging seat |
| 4 | Automatic transmission selector mechanism |
| 5 | Horn |
| 6 | Parking brake |
| 7 | Gateway control module |
| 8 | Roof electronics control module |
| 9 | Emergency call system |
| 10 | Airbag control module |
| 11 | Electronic Stabilization Control (ESC) |
| 12 | Diagnostic connector, light/rain sensor |
| 13 | Climate control system |
| 14 | Right front door control module |
| 15 | A/C compressor |
| Fuse panel C (black) | |
| 1 | Front seat heating |
| 2 | Windshield wipers |
| 3 | Left headlight electronics |
| 4 | Panorama glass roof / sliding/tilting sunroof |
| 5 | Left front door control module |
| 6 | Sockets |
| 7 | Door control module, right rear window regulator |
| 8 | AWD control module |
| 9 | Right headlight electronics |
| 10 | Windshield washer system/headlight washer system |
| 11 | Door control module, left rear window regulator |
| 12 | Parking heater |
| Fuse panel D (black) | |
| 1 | Front seat electronics, seat ventilation, rearview mirror, rear climate control system controls, windshield defogger, Gateway diagnostics |
| 2 | Gateway diagnosis, vehicle electrical system control module |
| 3 | Sound actuator/exhaust sound tuning |
| 4 | Clutch pedal position sensor |
| 5 | Engine start, emergency shut-off |
| 6 | Gateway |
| 7 | USB charging port |
| 8 | Garage door opener |
| 9 | Adaptive cruise control, distance regulation |
| 11 | Video camera |
| 12 | Right headlight |
| 13 | Left headlight |
| 14 | Transmission fluid cooling valve |
| 15 | Alarm and hands-free calling system |
| Fuse panel E (red) | |
| 1 | Ignition coils |
| 2 | Compressor clutch, CNG system |
| 5 | Left headlight |
| 6 | Automatic transmission |
| 7 | Instrument panel |
| 8 | Climate control system fresh air blower |
| 9 | Right headlight |
| 10 | Dynamic steering |
| 11 | Engine start |
Luggage compartment fuse box:
| Fuse/Relay N° | Functions |
| Fuse panel A (black) | |
| 2 | Windshield defroster |
| 3 | Windshield defroster |
| 5 | Suspension control |
| 6 | Automatic transmission |
| 7 | Rear window defogger |
| 8 | Rear seat heating |
| 9 | Left tail lights |
| 10 | Airbag control module |
| 11 | Luggage compartment lid central locking, fuel filler door, luggage compartment cover |
| 12 | Luggage compartment lid control module |
| Fuse panel B (red) | |
| 6 | Battery power interrupt |
| Fuse panel C (brown) | |
| 2 | Telephone, mobile device charging function |
| 3 | Right front seat electronics, lumbar support |
| 4 | Side assist |
| 6 | Tire pressure monitoring system |
| 7 | Vehicle opening/start (NFC) |
| 8 | Auxilliary heating radio receiver, smart module (fuel tank) |
| 10 | TV tuner, gateway |
| 11 | Auxiliary battery control module |
| 12 | Garage door opener |
| 13 | Rearview camera, peripheral cameras |
| 14 | Right tail lights |
| 16 | Right safety belt tensioner |
| Fuse panel E (red) | |
| 3 | Exhaust treatment |
| 5 | Trailer hitch (right light) |
| 7 | Trailer hitch |
| 8 | Trailer hitch (left light) |
| 9 | Trailer hitch (socket) |
| 10 | Allroad sport differential |
| 11 | Exhaust treatment |
