The fifth-generation Audi A4 and S4 (B9/8W) have been produced from 2017 to the present. Here, you will find fuse box diagrams for Audi A4 and S4 models from 2017, 2018, and 2019. This guide provides information about the locations of the fuse panels inside the car. You will also learn about the function of each fuse.
Table of Contents
Cigar lighter / power outlet fuse in the Audi A4/S4 is the fuse No.6 (Black fuse panel C) in the Driver’s/front passenger’s foot well fuse box.
[2017]
Passenger compartment
(Foot well)
| Number | Electric equipment |
|---|---|
| Brown panel A | |
| 1 | — |
| 2 | Mass airflow sensor, camshaft adjustment |
| 3 | Exhaust doors, fuel injectors, radiator inlet |
| 4 | Vacuum pump, hot water pump, particulate sensor, biodiesel sensor |
| 5 | Brake light sensor |
| 6 | Engine valves |
| 7 | Heated oxygen sensor, mass airflow sensor |
| 8 | Water pump, high pressure pump, high pressure regulator valve |
| 9 | Hot water pump |
| 10 | Oil pressure sensor, oil temperature sensor |
| 11 | Clutch pedal position sensor |
| 12 | Engine valves |
| 13 | Radiator fan |
| 14 | Fuel injectors |
| 15 | Ignition coils |
| 16 | Fuel pump |
| Red panel B | |
| 1 | Anti-theft alarm system |
| 2 | Engine control module |
| 3 | Lumbar support |
| 4 | Automatic transmission selector mechanism |
| 5 | Horn |
| 6 | Electromechan ical park ing brake |
| 7 | Gateway control module |
| 8 | Interior headl iner lights |
| 9 | — |
| 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 |
| 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 |
| 8 | — |
| 9 | Right headlight electronics |
| 10 | Windshield washer system/headlight washer system |
| 11 | Left rear door control module |
| Black panel D | |
| 1 | Seat ventilation, rearv iew mirror, rear climate control system controls |
| 2 | Gateway, climate control system |
| 3 | Sound actuator/exhaust sound tuning |
| 4 | Clutch pedal position sensor |
| 5 | Engine start |
| 6 | — |
| 7 | — |
| 8 | Homelink |
| 9 | Adaptive cruise control |
| 10 | — |
| 11 | Video camera |
| 12 | Matrix LED headlight/right LED headlight |
| 13 | Matrix LED headlight/left LED headlight |
| 14 | Rear window wiper |
| Red panel E | |
| 1 | Ignition coils |
| 2 | Natural gas tank valves |
| 3 | — |
| 4 | — |
| 5 | Engine mount |
| 6 | Automat ic transmission |
| 7 | Instrument panel |
| 8 | Climate control system (blower) |
| 9 | — |
| 10 | Dynamic steering |
| 11 | Engine start |
Driver’s side cockpit
| Number | Electric equipment |
|---|---|
| 1 | — |
| 2 | Telephone |
| 3 | — |
| 4 | Head-up display |
| 5 | Audi music interface |
| 6 | Front climate control system controls |
| 7 | Steering column lock |
| 8 | Infotainment system display |
| 9 | Instrument cluster |
| 10 | Infotainment unit |
| 11 | Light switch |
| 12 | Steering column electronics |
| 13 | — |
| 14 | Infotainment system |
| 15 | — |
| 16 | Steering wheel heating |
Fuses in the Left luggage compartment
| 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 |
| 11 | Central locking |
| 12 | Electric luggage compartment lid |
| Red panel B | |
| – | Not assigned |
| Brown panel C | |
| 1 | — |
| 2 | Telephone |
| 3 | Lumbar support |
| 4 | Audi side assist |
| 5 | — |
| 6 | — |
| 7 | — |
| 8 | — |
| 9 | — |
| 10 | — |
| 11 | — |
| 12 | Homelink |
| 13 | Rearview camera, peripheral cameras |
| 14 | Right tail lights |
| 15 | — |
| 16 | Right safety belt tensioner |
| Red panel E | |
| 1 | — |
| 2 | Sound-amplifier |
| 3 | AdBlue |
| 4 | — |
| 5 | Trailer hitch (right light) |
| 6 | — |
| 7 | Trailer hitch |
| 8 | Trailer hitch (left light) |
| 9 | Trailer hitch (socket) |
| 10 | Sport differential |
| 11 | Ad Blue |
[2018]
Passenger compartment
(Foot well)
| Number | Electric equipment |
|---|---|
| Brown panel A | |
| 1 | — |
| 2 | Mass airflow sensor, camshaft adjustment, charge air cooler pump |
| 3 | Exhaust doors, fuel injectors, radiator inlet |
| 4 | Vacuum pump, hot water pump, particulate sensor, biodiesel sensor |
| 5 | Brake light sensor |
| 6 | Engine valves, camshaft adjustment |
| 7 | Heated oxygen sensor, mass airflow sensor |
| 8 | Water pump, high pressure pump, high pressure regulator valve |
| 9 | Hot water pump |
| 10 | Oil pressure sensor, oil temperature sensor |
| 11 | Clutch pedal position sensor |
| 12 | Engine valves |
| 13 | Radiator fan |
| 14 | Fuel injectors |
| 15 | Ignition coils |
| 16 | Fuel pump |
| Red panel B | |
| 1 | Anti-theft alarm system |
| 2 | Engine control module |
| 3 | Lumbar support |
| 4 | Automatic transmission selector mechanism |
| 5 | Horn |
| 6 | Electromechanical park ing brake |
| 7 | Gateway control module |
| 8 | Interior headl iner lights |
| 9 | — |
| 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 |
| 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 |
| 8 | All wheel drive |
| 9 | Right headlight electronics |
| 10 | Windshield washer system/headlight washer system |
| 11 | Left rear door control module |
| Black panel D | |
| 1 | Seat ventilation, rearv iew mirror, rear climate control system controls |
| 2 | Gateway, climate control system |
| 3 | Sound actuator/exhaust sound tuning |
| 4 | Clutch pedal position sensor |
| 5 | Engine start |
| 6 | — |
| 7 | Rear USB charg ing port |
| 8 | Homelink |
| 9 | Adaptive cruise control |
| 10 | — |
| 11 | Video camera |
| 12 | Matrix LED headlight/right LED headlight |
| 13 | Matrix LED headlight/left LED headlight |
| 14 | Rear window wiper |
| Red panel E | |
| 1 | Ignition coils |
| 2 | Natural gas tank valves |
| 3 | — |
| 4 | — |
| 5 | Engine mount |
| 6 | Automatic transmission |
| 7 | Instrument panel |
| 8 | Climate control system (blower) |
| 9 | — |
| 10 | Dynamic steering |
| 11 | Engine start |
Driver’s side cockpit
| Number | Electric equipment |
|---|---|
| 1 | — |
| 2 | Telephone |
| 3 | — |
| 4 | Head-up display |
| 5 | Audi music interface, USB charging port |
| 6 | Front climate control system controls |
| 7 | Steering column lock |
| 8 | Infotainment system display |
| 9 | Instrument cluster |
| 10 | Infotainment unit |
| 11 | Light switch |
| 12 | Steering column electronics |
| 13 | — |
| 14 | Infotainment system |
| 15 | — |
| 16 | Steering wheel heating |
Fuses in the Left luggage compartment
| 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 |
| 11 | Central locking system |
| 12 | Electric luggage compartment lid |
| Red panel B | |
| — | Not assigned |
| Brown panel C | |
| 1 | — |
| 2 | Telephone |
| 3 | Lumbar support |
| 4 | Audi side assist |
| 5 | — |
| 6 | — |
| 7 | — |
| 8 | Smart module (tank) |
| 9 | — |
| 10 | — |
| 11 | 12 Volt battery |
| 12 | Homelink |
| 13 | Rearview camera, peripheral cameras |
| 14 | Right tail lights |
| 15 | — |
| 16 | Right safety belt tensioner |
| Red panel E | |
| 1 | — |
| 2 | Sound-amplifier |
| 3 | AdBlue heating |
| 4 | — |
| 5 | Trailer hitch (right light) |
| 6 | — |
| 7 | Trailer hitch |
| 8 | Trailer hitch (left light) |
| 9 | Trailer hitch (socket) |
| 10 | Sport differential |
| 11 | Ad Blue |
[2019]
Passenger compartment
(Foot well)
| Number | Equipment |
|---|---|
| Fuse panel A (brown) | |
| 2 | Mass airflow sensor, camshaft adjustment, charge air cooler pump |
| 3 | Exhaust doors, fuel injectors, radiator inlet, crankshaft housing heater |
| 4 | Vacuum pump, hot water pump, particulate sensor, biodiesel sensor, exhaust doors |
| 5 | Brake light sensor |
| 6 | Engine valves, camshaft adjustment |
| 7 | Heated oxygen sensor, mass airflow sensor |
| 8 | Water pump, high pressure pump, high pressure regulator valve |
| 9 | Hot water pump |
| 10 | Oil pressure sensor, oil temperature sensor |
| 11 | Clutch pedal position sensor, engine start |
| 12 | Engine valves |
| 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 | Lumbar support |
| 4 | Automatic transmission selector mechanism |
| 5 | Horn |
| 6 | Electromechanical parking brake |
| 7 | Gateway control module |
| 8 | Interior headliner lights |
| 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 | Panoramic glass roof / sliding/tilting sunroof |
| 5 | Left front door control module |
| 6 | Sockets |
| 7 | Right rear door control module |
| 8 | All wheel drive |
| 9 | Right headlight electronics |
| 10 | Windshield washer system/headlight washer system |
| 11 | Left rear door control module |
| Fuse panel D (black) | |
| 1 | Seat ventilation, rearview mirror, climate control system, rear climate control system controls, windshield defogger |
| 2 | Gateway, climate control system |
| 3 | Sound actuator/exhaust sound tuning |
| 4 | Clutch pedal position sensor |
| 5 | Engine start |
| 7 | Rear USB charging port |
| 8 | Garage door opener |
| 9 | Adaptive cruise control |
| 10 | Exterior sound |
| 11 | Video camera |
| 12 | Matrix LED headlight/right LED headlight |
| 13 | Matrix LED headlight/left LED headlight |
| 14 | Rear window wiper |
| 16 | Rear Seat Entertainment preparation |
| Fuse panel E (red) | |
| 1 | Ignition coils |
| 5 | Engine mount |
| 6 | Automatic transmission |
| 7 | Instrument panel |
| 8 | Climate control system (blower) |
| 10 | Dynamic steering |
| 11 | Engine start |
Driver’s side cockpit
| Number | Equipment |
|---|---|
| 1 | Vehicle opening/start (NFC) |
| 2 | Telephone |
| 4 | Head-up display |
| 5 | Audi music interface, USB charging port |
| 6 | Front climate control system controls |
| 7 | Steering column lock |
| 8 | Infotainment system display |
| 9 | Instrument cluster |
| 10 | Infotainment unit |
| 11 | Light switch, switch panel |
| 12 | Steering column electronics |
| 14 | Infotainment system |
| 16 | Steering wheel heating |
Fuses in the Left luggage compartment
| Number | Equipment |
|---|---|
| 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 | Left safety belt tensioner |
| 11 | Central locking system |
| 12 | Luggage compartment lid |
| Fuse panel B (red) | |
| Not assigned | |
| Fuse panel C (brown) | |
| 2 | Telephone |
| 3 | Lumbar support |
| Fuse panel D (brown) | |
| 4 | Audi side assist |
| 5 | Rear Seat Entertainment preparation |
| 7 | Vehicle opening/start (NFC) |
| 8 | Smart module (tank) |
| 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) | |
| 2 | Sound-amplifier |
| 3 | AdBlue heating |
| 5 | Trailer hitch (right light) |
| 7 | Trailer hitch |
| 8 | Trailer hitch (left light) |
| 9 | Trailer hitch (socket) |
| 10 | Sport differential |
| 11 | AdBlue heating |
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Tom Smith is a passionate car mechanic and automotive enthusiast, specializing in the intricate world of car fuse boxes. With years of hands-on experience under the hood, he has earned a reputation as a reliable expert in his field. As the founder and content creator of the popular blog website 'carsfuse.com,' Tom has dedicated himself to sharing his extensive knowledge of car fuse boxes and electrical systems with the world.