Audi A4 and S4 B9/8W (2017-2019…) – fuse box
Audi A4 and S4 B9 / 8W (2017-2019…) – fuse box diagram
Year of production: 2017, 2018, 2019, 2020.
The fuse for the cigarette lighter / power socket on the Audi A4 and S4 is fuse number 6 (black fuse panel C) in the fuse box in the driver / passenger footwell.
Location of the fuse box
Driver / front passenger footwell
Left-hand drive vehicles: Located under the footrest.
Right-hand drive vehicles: behind a cover under the glove box.
Driver’s side cockpit
Trunk
It is located on the left side of the trunk behind the trim panel.
Fuse box diagrams
2017
Driver / front passenger footwell (LHD)
Front passenger footwell (RHD)
Fuse assignment in passenger compartment (legs) (2017)
| Number | Description |
|---|---|
| Brown panel A | |
| 1 | – |
| 2 | Mass air flow 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 air flow sensor. |
| 8 | The water pump;
High pressure pump; High pressure regulating 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 selection mechanism |
| 5 | Horn |
| 6 | Electromechanical parking brake |
| 7 | Gate control module |
| 8 | Internal interior headlamps |
| 9 | – |
| 10 | Airbag control module |
| 11 | Electronic Stability Control (ESC) |
| 12 | Diagnostic connector;
Light and rain sensor |
| 13 | Climate control system |
| 14 | Right front door control module |
| 15 | Air conditioning compressor |
| Black panel C. | |
| 1 | Front seat heating |
| 2 | Wipers |
| 3 | Left head lighting electronics |
| 4 | Panoramic glass sunroof / sliding / tilting sunroof |
| 5 | Left front door control module |
| 6 | Sockets |
| 7 | Right rear door control module |
| 8 | – |
| 9 | Right headlight electronics |
| 10 | Windscreen washers;
Headlight washers. |
| 11 | Left Rear Door Control Module |
| Black panel D | |
| 1 | Seat ventilation;
Rearview mirror; Rear air conditioning system control. |
| 2 | Gate;Climate control system. |
| 3 | Adjustment of actuator sound, exhaust sound |
| 4 | Clutch pedal position sensor |
| 5 | Engine start |
| 6 | – |
| 7 | – |
| 8 | Homelink |
| 9 | Adaptive cruise control |
| 10 | – |
| 11 | Video camera |
| 12 | Matrix LED headlight and right-hand LED headlight |
| 13 | Matrix LED headlight and left LED headlight |
| 14 | Rear window wiper |
| Red panel E. | |
| 1 | Ignition coils |
| 2 | Valves for natural gas tanks |
| 3 | – |
| 4 | – |
| 5 | Engine mount |
| 6 | Automatic gearbox |
| 7 | Instrument panel |
| 8 | Air conditioning system (blower) |
| 9 | – |
| 10 | Dynamic steering |
| 11 | Engine start |
Driver’s side cockpit
Driver’s side cockpit fuse assignment (2017)
| Number | Description |
|---|---|
| 1 | – |
| 2 | Telephone |
| 3 | – |
| 4 | Head-up display |
| 5 | Audi music interface |
| 6 | Front air conditioning 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 |
Left side of the trunk
Fuse allocation in the left luggage compartment (2017)
| Number | Description |
|---|---|
| Black panel A | |
| 1 | – |
| 2 | Windshield defroster |
| 3 | Windshield defroster |
| 4 | – |
| 5 | Suspension control |
| 6 | Automatic gearbox |
| 7 | Rear window defogger |
| 8 | Rear seat heating |
| 9 | Rear lights |
| 10 | Left seat belt pretensioner |
| 11 | Central lock |
| 12 | Electric trunk lid |
| Red panel B. | |
| – | Not assigned |
| Brown panel C. | |
| 1 | – |
| 2 | Telephone |
| 3 | Lumbar support |
| 4 | Audi side assistant |
| 5 | – |
| 6 | – |
| 7 | – |
| 8 | – |
| 9 | – |
| 10 | – |
| 11 | – |
| 12 | Homelink |
| 13 | Rear view camera;
Peripheral cameras. |
| 14 | Right rear lights |
| 15 | – |
| 16 | Right seat belt pretensioner |
| Red panel E. | |
| 1 | – |
| 2 | Sound amplifier |
| 3 | AdBlue |
| 4 | – |
| 5 | Trailer hitch (right light) |
| 6 | – |
| 7 | Towbar |
| 8 | Trailer hitch (left light) |
| 9 | Trailer hitch (socket) |
| 10 | Sports differential |
| 11 | Ad Blue |
2018
Driver / front passenger footwell (LHD)
Front passenger footwell (RHD)
Assignment of fuses in passenger compartment (footwell) (2018)
| Number | Description |
|---|---|
| Brown panel A | |
| 1 | – |
| 2 | Mass air flow 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 air flow sensor. |
| 8 | The water pump;
High pressure pump; High pressure regulating 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 selection mechanism |
| 5 | Horn |
| 6 | Electromechanical parking brake |
| 7 | Gate control module |
| 8 | Internal interior headlamps |
| 9 | – |
| 10 | Airbag control module |
| 11 | Electronic Stability Control (ESC) |
| 12 | Diagnostic connector;
Light and rain sensor |
| 13 | Climate control system |
| 14 | Right front door control module |
| 15 | Air conditioning compressor |
| Black panel C. | |
| 1 | Front seat heating |
| 2 | Wipers |
| 3 | Left head lighting electronics |
| 4 | Panoramic glass sunroof / 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 | Windscreen washers;
Headlight washers. |
| 11 | Left Rear Door Control Module |
| Black panel D | |
| 1 | Seat ventilation;
Rearview mirror; Rear air conditioning system control. |
| 2 | Gate;
Air conditioning control system. |
| 3 | Adjustment of actuator sound, exhaust sound |
| 4 | Clutch pedal position sensor |
| 5 | Engine start |
| 6 | – |
| 7 | Rear USB charging port |
| 8 | Homelink |
| 9 | Adaptive cruise control |
| 10 | – |
| 11 | Video camera |
| 12 | Matrix LED headlight and right-hand LED headlight |
| 13 | Matrix LED headlight and left LED headlight |
| 14 | Rear window wiper |
| Red panel E. | |
| 1 | Ignition coils |
| 2 | Valves for natural gas tanks |
| 3 | – |
| 4 | – |
| 5 | Engine mount |
| 6 | Automatic gearbox |
| 7 | Instrument panel |
| 8 | Air conditioning system (blower) |
| 9 | – |
| 10 | Dynamic steering |
| 11 | Engine start |
Driver’s side cockpit
Driver’s side cockpit fuse assignment (2018)
| Number | Description |
|---|---|
| 1 | – |
| 2 | Telephone |
| 3 | – |
| 4 | Head-up display |
| 5 | Audi music interface;
USB charging port. |
| 6 | Front air conditioning 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 |
Left side of the trunk
Fuse allocation in the left luggage compartment (2018)
| Number | Description |
|---|---|
| Black panel A | |
| 1 | – |
| 2 | Windshield defroster |
| 3 | Windshield defroster |
| 4 | – |
| 5 | Suspension control |
| 6 | Automatic gearbox |
| 7 | Rear window defogger |
| 8 | Rear seat heating |
| 9 | Rear lights |
| 10 | Left seat belt pretensioner |
| 11 | Central lock |
| 12 | Electric trunk lid |
| Red panel B. | |
| – | Not assigned |
| Brown panel C. | |
| 1 | – |
| 2 | Telephone |
| 3 | Lumbar support |
| 4 | Audi side assistant |
| 5 | – |
| 6 | – |
| 7 | – |
| 8 | Intelligent module (tank) |
| 9 | – |
| 10 | – |
| 11 | 12 V battery. |
| 12 | Homelink |
| 13 | Rear view camera;
Peripheral cameras. |
| 14 | Right rear lights |
| 15 | – |
| 16 | Right seat belt pretensioner |
| Red panel E. | |
| 1 | – |
| 2 | Sound amplifier |
| 3 | AdBlue heating |
| 4 | – |
| 5 | Trailer hitch (right light) |
| 6 | – |
| 7 | Towbar |
| 8 | Trailer hitch (left light) |
| 9 | Trailer hitch (socket) |
| 10 | Sports differential |
| 11 | Ad Blue |
