Audi A4 and S4 B9/8W – fuse box diagram
Year of manufacture: 2017, 2018, 2019.
Lighter fuse / electrical outlet on Audi A4 and S4 Is fuse #6 (black fuse panel C) in the fuse box in the driver / passenger leg room.
Location of the fuse box
Driver/front passenger space
Vehicles with steering wheel on the left side: Located under the footrest.
Vehicles with the steering wheel on the right side: Behind the lid under the glove box.
Driver’s side cockpit
Luggage compartment
Located on the left side of the luggage compartment behind the trim panel.
Fuse box diagrams
2017
Driver/front passenger (LHD) leg room
Front passenger’s legroom (RHD)
Fuse assignment in the passenger compartment (legs) (2017)
| Number | Description |
|---|---|
| Brown panel A | |
| 1 | – |
| 2 | Mass airflow sensor;
Camshaft adjustment. |
| 3 | Exhaust ports;
Fuel injectors; Radiator inlet. |
| 4 | Vacuum pump;
Hot water pump; Particulate matter 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 control 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 | Motor control module |
| 3 | Lumbar support |
| 4 | Automatic transmission selection mechanism |
| 5 | Horn |
| 6 | Electromechanical parking brake |
| 7 | Gate control module |
| 8 | Interior lights |
| 9 | – |
| 10 | Airbag control module |
| 11 | Electronic Stability Control (ESC) |
| 12 | Diagnostic connector;
Light and rain sensor |
| 13 | Climate control system |
| 14 | Front right door control module |
| 15 | A/C Compressor |
| Black C-panel | |
| 1 | Front seat heating |
| 2 | Cleaners |
| 3 | Left head lighting electronics |
| 4 | Panoramic glass roof / sliding roof / sloping roof |
| 5 | Front left door control module |
| 6 | Plugs |
| 7 | Right Rear Door Control Module |
| 8 | – |
| 9 | Right Headlight Electronics |
| 10 | Windshield washers;
Headlight washers. |
| 11 | Left rear door control module |
| Black panel D | |
| 1 | Seat ventilation;
Rearview mirror; Rear air conditioning system control. |
| 2 | Gateway;
Climate control system. |
| 3 | Actuator sound adjustment, exhaust sound |
| 4 | Clutch pedal position sensor |
| 5 | Starting the engine |
| 6 | – |
| 7 | – |
| 8 | Homelink |
| 9 | Adaptive cruise control |
| 10 | – |
| 11 | Video Camera |
| 12 | Matrix LED Headlight and LED Headlight Right |
| 13 | Matrix LED headlight and LED headlight left |
| 14 | Rear window wiper |
| Red panel E. | |
| 1 | Ignition coils |
| 2 | Valves for natural gas tanks |
| 3 | – |
| 4 | – |
| 5 | Engine mount |
| 6 | Automatic transmission |
| 7 | Dashboard |
| 8 | Air conditioning system (blower) |
| 9 | – |
| 10 | Dynamic control |
| 11 | Starting the engine |
Driver’s side cockpit
Fuse assignment in the driver’s side cockpit (2017)
| Number | Description |
|---|---|
| 1 | – |
| 2 | Phone |
| 3 | – |
| 4 | Main Screen |
| 5 | Audi music interface |
| 6 | Front air conditioning controls |
| 7 | Steering column lock |
| 8 | Infotainment system display |
| 9 | Instrument cluster |
| 10 | Information and Entertainment Unit |
| 11 | Light Switch |
| 12 | Steering column electronics |
| 13 | – |
| 14 | Infotainment system |
| 15 | – |
| 16 | Steering wheel heating |
Left boot side
Fuse assignment in the left trunk (2017)
| Number | Description |
|---|---|
| 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 | Rear lights |
| 10 | Seat belt tensioner on the left |
| 11 | Central locking system |
| 12 | Electric trunk lid |
| Red panel B. | |
| – | Not assigned |
| Brown panel C | |
| 1 | – |
| 2 | Phone |
| 3 | Lumbar support |
| 4 | Audi Lateral Assistance |
| 5 | – |
| 6 | – |
| 7 | – |
| 8 | – |
| 9 | – |
| 10 | – |
| 11 | – |
| 12 | Homelink |
| 13 | Reverse Reversing Camera;
Peripheral cameras. |
| 14 | Right rear light |
| 15 | – |
| 16 | Right seat belt tensioner |
| Red panel E. | |
| 1 | – |
| 2 | Sound amplifier |
| 3 | AdBlue |
| 4 | – |
| 5 | Trailer hitch (right light) |
| 6 | – |
| 7 | Towing hook |
| 8 | Trailer hitch (left light) |
| 9 | Towing hitch (socket) |
| 10 | Sport differential |
| 11 | Blue Ad |
2018
Driver/front passenger leg room (LHD)
Front passenger’s legroom (RHD)
Passenger compartment fuse distribution (in the leg room) (2018)
| Number | Description |
|---|---|
| Brown panel A | |
| 1 | – |
| 2 | Mass airflow sensor;
Camshaft adjustment; Charge air cooling pump. |
| 3 | Exhaust ports;
Fuel injectors; Radiator inlet. |
| 4 | Vacuum pump;
Hot water pump; Particulate matter 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 control 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 | Motor control module |
| 3 | Lumbar support |
| 4 | Automatic transmission selection mechanism |
| 5 | Horn |
| 6 | Electromechanical parking brake |
| 7 | Gate Control Module |
| 8 | Interior lights |
| 9 | – |
| 10 | Airbag control module |
| 11 | Electronic Stability Control (ESC) |
| 12 | Diagnostic connector;
Light and rain sensor |
| 13 | Climate control system |
| 14 | Front right door control module |
| 15 | A/C Compressor |
| Black panel C | |
| 1 | Front seat heating |
| 2 | Cleaners |
| 3 | Left head lighting electronics |
| 4 | Panoramic glass roof / sliding roof / sloping roof |
| 5 | Front left door control module |
| 6 | Plugs |
| 7 | Right Rear Door Control Module |
| 8 | Four Wheel Drive |
| 9 | Right headlight electronics |
| 10 | Windshield washers;
Headlight washers. |
| 11 | Left rear door control module |
| Black panel D | |
| 1 | Seat ventilation;
Rearview mirror; Rear air conditioning system control. |
| 2 | Gateway;
Air conditioning control system. |
| 3 | Actuator sound adjustment, exhaust sound |
| 4 | Clutch pedal position sensor |
| 5 | Starting the engine |
| 6 | – |
| 7 | Rear USB Charging Port |
| 8 | Homelink |
| 9 | Adaptive cruise control |
| 10 | – |
| 11 | Video Camera |
| 12 | Matrix LED Headlight and LED Headlight Right |
| 13 | Matrix LED headlight and LED headlight left |
| 14 | Rear window wiper |
| Red panel E. | |
| 1 | Ignition coils |
| 2 | Valves for natural gas tanks |
| 3 | – |
| 4 | – |
| 5 | Engine mount |
| 6 | Automatic transmission |
| 7 | Dashboard |
| 8 | Air conditioning system (blower) |
| 9 | – |
| 10 | Dynamic control |
| 11 | Starting the engine |
Cockpit side
Fuse assignment in the driver-side cockpit (2018)
| Number | Description |
|---|---|
| 1 | – |
| 2 | Phone |
| 3 | – |
| 4 | Main Screen |
| 5 | Audi music interface;
USB charging port. |
| 6 | Front air conditioning controls |
| 7 | Steering column lock |
| 8 | Infotainment system display |
| 9 | Instrument cluster |
| 10 | Information and Entertainment Unit |
| 11 | Light Switch |
| 12 | Steering column electronics |
| 13 | – |
| 14 | Infotainment System |
| 15 | – |
| 16 | Steering wheel heating |
Left side of the boot
Fuse assignment in the left trunk (2018)
| Number | Description |
|---|---|
| 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 | Rear lights |
| 10 | Seat belt tensioner on the left |
| 11 | Central locking system |
| 12 | Electric trunk lid |
| Red panel B. | |
| – | Not assigned |
| Brown panel C | |
| 1 | – |
| 2 | Phone |
| 3 | Lumbar support |
| 4 | Audi Lateral Assistance |
| 5 | – |
| 6 | – |
| 7 | – |
| 8 | Intelligent module (tank) |
| 9 | – |
| 10 | – |
| 11 | 12 V Battery. |
| 12 | Homelink |
| 13 | Reverse Reversing Camera;
Peripheral cameras. |
| 14 | Right rear light |
| 15 | – |
| 16 | Right Seat Belt Tensioner |
| Red panel E. | |
| 1 | – |
| 2 | Sound amplifier |
| 3 | AdBlue Heating |
| 4 | – |
| 5 | Trailer hitch (right light) |
| 6 | – |
| 7 | Towing hook |
| 8 | Trailer hitch (left light) |
| 9 | Towing hitch (socket) |
| 10 | Sport differential |
| 11 | Blue Ad |
