Audi A4-S4 (B9-8W) (2015-2023) Fuse Box Location & Diagram

The fifth-generation Audi A4/S4 (B9/8W), which has been in production from 2015 to the present. We provide comprehensive fuse box diagrams for the Audi A4 and S4 models, covering the years 2015, 2016, 2017, 2018, 2019 and facelift models from 2020, 2021, 2022 and 2023. These diagrams serve as valuable resources, detailing the location of the fuse panels within the vehicle’s interior and providing information about the assignment and layout of each fuse. Whether you need to replace a fuse or understand the functionality of a specific fuse, these diagrams offer essential guidance. Stay informed about the fuse box layout in your Audi A4 or S4 by referring to this article, ensuring proper maintenance and optimal performance.

Fuse Box Location

Driver’s or Passenger’s Compartment

For left-hand drive vehicles (LHD), the fuse box is situated under the footrest.

For right-hand drive vehicles (RHD), the fuse box is located behind the cover under the glove box.

On cockpit’s left side

Luggage compartment

The fuse box is positioned on the left side of the trunk, concealed behind the trim panel.

Fuse Box Diagrams

2015-2017

Driver’s Compartment

For left-hand drive vehicles only.

Front passenger‘s footwell

For right-hand drive vehicles only.

The table below displays the assignment of fuses in the passenger compartment (footwell) from the 2015 to 2017 vehicle model.

No.Description
Fuse Holder – A
1Empty
2Mass airflow sensor, camshaft adjustment
3Exhaust doors, fuel injectors, radiator inlet
4Vacuum pump, hot water pump, particulate sensor, biodiesel sensor
5Brake light sensor
6Engine valves
7Heated oxygen sensor, mass airflow sensor
8Water pump, high pressure pump, high pressure regulator valve
9Hot water pump
10Oil pressure sensor, oil temperature sensor
11Clutch pedal position sensor
12Engine valves
13Radiator fan
14Fuel injectors
15Ignition coils
16Fuel pump
Fuse Holder – B
1Anti-theft alarm system
2Engine control module
3Lumbar support
4Automatic transmission selector mechanism
5Horn
6Electromechan ical park ing brake
7Gateway control module
8Interior headl iner lights
9Empty
10Airbag control module
11Electronic Stabilization Control (ESC
12Diagnostic connector, light/rain sensor
13Climate control system
14Right front door control module
15A/C compressor
Fuse Holder – C
1Front seat heating
2Windshield wipers
3Left head light electronics
4Panorama glass roof/ sliding/tilting sunroof
5Left front door control module
6Sockets
7Right rear door control module
8Empty
9Right headlight electronics
10Windshield washer system/headlight washer system
11Left rear door control module
Fuse Holder – D
1Seat ventilation, rearv iew mirror, rear climate control system controls
2Gateway, climate control system
3Sound actuator/exhaust sound tuning
4Clutch pedal position sensor
5Engine start
6Empty
7Empty
8Homelink
9Adaptive cruise control
10Empty
11Video camera
12Matrix LED headlight/right LED headlight
13Matrix LED headlight/left LED headlight
14Rear window wiper
Fuse Holder – E
1Ignition coils
2Natural gas tank valves
3Empty
4Empty
5Engine mount
6Automat ic transmission
7Instrument panel
8Climate control system (blower)
9Empty
10Dynamic steering
11Engine start

Cockpit’s left side

The table below displays the assignment of 16 fuses in the cockpit’s left side from the year 2015 to 2017 vehicle models.

No.Description
1Empty
2Telephone
3Empty
4Head-up display
5Audi music interface
6Front climate control system controls
7Steering column lock
8Infotainment syst em display
9Instrument cluster
10Infotainment unit
11Light switch
12Steering column electronics
13Empty
14Infotainment system
15Empty
16Steering wheel heating

Luggage compartment

The table below displays the assignment of fuses in the left side of luggage compartment from the year 2015 to 2017 vehicle models.

No.Description
Fuse Holder A
1Empty
2Windshield defroster
3Windshield defroster
4Empty
5Suspension control
6Automatic transmission
7Rear window defogger
8Rear seat heating
9Tail lights
10Left safety belt tensioner
11Central locking
12Electric luggage compartment lid
Fuse Holder B
Not assigned
Fuse Holder C
1Empty
2Telephone
3Lumbar support
4Audi side assist
5Empty
6Empty
7Empty
8Empty
9Empty
10Empty
11Empty
12Homelink
13Rearview camera, peripheral cameras
14Right tail lights
15Empty
16Right safety belt tensioner
Fuse Holder E
1Empty
2Sound-amplifier
3AdBlue
4Empty
5Trailer hitch (right light)
6Empty
7Trailer hitch
8Trailer hitch (left light)
9Trailer hitch (socket)
10Sport differential
11Ad Blue

2018

Driver’s Compartment

For left-hand drive vehicles only.

Front passenger‘s footwell

For right-hand drive vehicles only.

The table below displays the assignment of fuses in the passenger compartment (footwell) for 2018 vehicle model.

No.Description
Fuse Holder A
1Empty
2Mass airflow sensor, camshaft adjustment, charge air cooler pump
3Exhaust doors, fuel injectors, radiator inlet
4Vacuum pump, hot water pump, particulate sensor, biodiesel sensor
5Brake light sensor
6Engine valves, camshaft adjustment
7Heated oxygen sensor, mass airflow sensor
8Water pump, high pressure pump, high pressure regulator valve
9Hot water pump
10Oil pressure sensor, oil temperature sensor
11Clutch pedal position sensor
12Engine valves
13Radiator fan
14Fuel injectors
15Ignition coils
16Fuel pump
Fuse Holder B
1Anti-theft alarm system
2Engine control module
3Lumbar support
4Automatic transmission selector mechanism
5Horn
6Electromechanical park ing brake
7Gateway control module
8Interior headl iner lights
9Empty
10Airbag control module
11Electronic Stabilization Control (ESC)
12Diagnostic connector, light/rain sensor
13Climate control system
14Right front door control module
15A/C compressor
Fuse Holder C
1Front seat heating
2Windshield wipers
3Left head light electronics
4Panorama glass roof/ sliding/tilting sunroof
5Left front door control module
6Sockets
7Right rear door control module
8All wheel drive
9Right headlight electronics
10Windshield washer system/headlight washer system
11Left rear door control module
Fuse Holder D
1Seat ventilation, rearv iew mirror, rear climate control system controls
2Gateway, climate control system
3Sound actuator/exhaust sound tuning
4Clutch pedal position sensor
5Engine start
6Empty
7Rear USB charg ing port
8Homelink
9Adaptive cruise control
10Empty
11Video camera
12Matrix LED headlight/right LED headlight
13Matrix LED headlight/left LED headlight
14Rear window wiper
Fuse Holder E
1Ignition coils
2Natural gas tank valves
3Empty
4Empty
5Engine mount
6Automatic transmission
7Instrument panel
8Climate control system (blower)
9Empty
10Dynamic steering
11Engine start

Cockpit’s left side

The table below displays the assignment of 16 fuses in the cockpit’s left side for 2018 vehicle model.

No.Description
1Empty
2Telephone
3Empty
4Head-up display
5Audi music interface, USB charging port
6Front climate control system controls
7Steering column lock
8Infotainment system display
9Instrument cluster
10Infotainment unit
11Light switch
12Steering column electronics
13Empty
14Infotainment system
15Empty
16Steering wheel heating

Luggage compartment

The table below displays the assignment of fuses in the left side of luggage compartment for 2018 vehicle models.

No.Description
Fuse Holder A
1Empty
2Windshield defroster
3Windshield defroster
4Empty
5Suspension control
6Automatic transmission
7Rear window defogger
8Rear seat heating
9Tail lights
10Left safety belt tensioner
11Central locking system
12Electric luggage compartment lid
Fuse Holder B
Not assigned
Fuse Holder C
1Empty
2Telephone
3Lumbar support
4Audi side assist
5Empty
6Empty
7Empty
8Smart module (tank)
9Empty
10Empty
1112 Volt battery
12Homelink
13Rearview camera, peripheral cameras
14Right tail lights
15Empty
16Right safety belt tensioner
Fuse Holder E
1Empty
2Sound-amplifier
3AdBlue heating
4Empty
5Trailer hitch (right light)
6Empty
7Trailer hitch
8Trailer hitch (left light)
9Trailer hitch (socket)
10Sport differential
11Ad Blue

2019

Driver’s Compartment

For left-hand drive vehicles only.

Front passenger‘s footwell

For right-hand drive vehicles only.

The table below displays the assignment of fuses in the passenger compartment (footwell) for 2019 vehicle model.

No.Description
Fuse Holder A
2Mass airflow sensor, camshaft adjustment, charge air cooler pump
3Exhaust doors, fuel injectors, radiator inlet, crankshaft housing heater
4Vacuum pump, hot water pump, particulate sensor, biodiesel sensor, exhaust doors
5Brake light sensor
6Engine valves, camshaft adjustment
7Heated oxygen sensor, mass airflow sensor
8Water pump, high pressure pump, high pressure regulator valve
9Hot water pump
10Oil pressure sensor, oil temperature sensor
11Clutch pedal position sensor, engine start
12Engine valves
13Radiator fan
14Fuel injectors, engine control module
15Ignition coils, heated oxygen sensors
16Fuel pump
Fuse Holder B
1Anti-theft alarm system
2Engine control module
3Lumbar support
4Automatic transmission selector mechanism
5Horn
6Electromechanical parking brake
7Gateway control module
8Interior headliner lights
9Emergency call system
10Airbag control module
11Electronic Stabilization Control (ESC)
12Diagnostic connector, light/rain sensor
13Climate control system
14Right front door control module
15A/C compressor
Fuse Holder C
1Front seat heating
2Windshield wipers
3Left headlight electronics
4Panoramic glass roof / sliding/tilting sunroof
5Left front door control module
6Sockets
7Right rear door control module
8All wheel drive
9Right headlight electronics
10Windshield washer system/headlight washer system
11Left rear door control module
Fuse Holder D
1Seat ventilation, rearview mirror, climate control system, rear climate control system controls, windshield defogger
2Gateway, climate control system
3Sound actuator/exhaust sound tuning
4Clutch pedal position sensor
5Engine start
7Rear USB charging port
8Garage door opener
9Adaptive cruise control
10Exterior sound
11Video camera
12Matrix LED headlight/right LED headlight
13Matrix LED headlight/left LED headlight
14Rear window wiper
16Rear Seat Entertainment preparation
Fuse Holder E
1Ignition coils
5Engine mount
6Automatic transmission
7Instrument panel
8Climate control system (blower)
10Dynamic steering
11Engine start

Cockpit’s left side

The table below displays the assignment of 16 fuses in the cockpit’s left side for 2019 vehicle model.

No.Description
1Vehicle opening/start (NFC)
2Telephone
4Head-up display
5Audi music interface, USB charging port
6Front climate control system controls
7Steering column lock
8Infotainment system display
9Instrument cluster
10Infotainment unit
11Light switch, switch panel
12Steering column electronics
14Infotainment system
16Steering wheel heating

Luggage compartment

The table below displays the assignment of fuses in the left side of luggage compartment for 2019 vehicle models.

No.Description
Fuse Holder A
2Windshield defroster
3Windshield defroster
5Suspension control
6Automatic transmission
7Rear window defogger
8Rear seat heating
9Left tail lights
10Left safety belt tensioner
11Central locking system
12Luggage compartment lid
Fuse Holder B
Not assigned
Fuse Holder C
2Telephone
3Lumbar support
Fuse Holder D
4Audi side assist
5Rear Seat Entertainment preparation
7Vehicle opening/start (NFC)
8Smart module (tank)
11Auxiliary battery control module
12Garage door opener
13Rearview camera, peripheral cameras
14Right tail lights
16Right safety belt tensioner
Fuse Holder E
2Sound-amplifier
3AdBlue heating
5Trailer hitch (right light)
7Trailer hitch
8Trailer hitch (left light)
9Trailer hitch (socket)
10Sport differential
11AdBlue heating

2020-2023 (Facelift)

Driver’s Compartment

For left-hand drive vehicles only.

Front passenger‘s footwell

For right-hand drive vehicles only.

The table below displays the assignment of fuses in the passenger compartment (footwell) for facelift vehicle model from 2020 to present.

No.Description
Fuse Holder A
1Catalytic converter heating
2Engine components
3Exhaust doors, fuel injectors, air intake, motor heating
4Vacuum pump, hot water pump, NOx sensor, particulate sensor, biodiesel sensor, exhaust doors
5Brake light sensor
6Engine valves, camshaft adjustment
7Heated oxygen sensors, mass airflow sensor, water pump
8Water pump, high pressure pump, high pressure regulator valve, temperature valve, engine mount
92020: Hot water pump, engine relay
2021-2022: Hot water pump, motor relay, 48 V starter generator, 48 V water pump
10Oil pressure sensor, oil temperature sensor
11Clutch position sensor, 48 V starter generator, water pump, 12V starter generator
12Engine valves, engine mount
13Engine cooling
14Fuel injectors, drive system control module
15Ignition coils, heated oxygen sensors
16Fuel pump
Fuse Holder B
1Anti-theft alarm system
2Drive system control module
3Left front seat electronics, lumbar support, massaging seat
4Automatic transmission selector lever
5Horn
6Parking brake
7Diagnostic interface (Gateway control module)
8Roof electronics control module
9Emergency call and communication control module
10Airbag control module
11Electronic Stabilization Control (ESC), Anti-Lock Braking System (ABS)
12Diagnostic connection, light/rain sensor
13Climate control system
14Right front door control module
15Climate control system compressor
162021-2022: Brake system pressure reservoir
Fuse Holder C
1Front seat heating
2Windshield wipers
3Left headlight electronics
4Panoramic glass roof / sliding/tilting sunroof
5Left front door control module
612 volt socket
7Right rear door control module, right rear power window
8All wheel drive (AWD) control module
9Right headlight electronics
10Windshield washer system/headlight washer system control module
nLeft rear door control module, left rear power window
12Parking heater
Fuse Holder D
1Front seat electronic, seat ventilation, rearview mirror, rear climate control system control panel, windshield heating, diagnostic connection
2Diagnostic interface, vehicle electrical system control module
3Sound generator
4Clutch position sensor
5Engine start, emergency shut-off
6Diagnostic connection, traffic information antenna (TMC)
7USB connection
8Garage door opener
9Audi adaptive cruise control, adaptive distance regulation
11Front camera
12Right headlight
13Left headlight
14Transmission fluid cooling
152020: Alarm and hands-free calling system
Fuse Holder E
1Ignition coils
2Climate control system compressor
5Left headlight
6Automatic transmission
7Instrument panel
8Climate control system blower
9Right headlight
10Dynamic steering
11Engine start

Cockpit’s left side

The table below displays the assignment of 16 fuses in the cockpit’s left side for facelift vehicle model from 2020 to present.

No.Description
1Convenience access and start authorization control module (NFC)
2Audi phone box, USB connection
4Head-up display
5Audi music interface, USB connection
6Front climate control system control panel
7Steering column lock
8Center display
9Instrument cluster
10Volume control
11Light switch, switch module
12Steering column electronics
132020: Particulate matter sensor for climate control system
14Infotainment system
162020: Steering wheel heating
2021-2022: Steering column electronics, steering wheel heating

Luggage compartment

The table below displays the assignment of fuses in the left side of luggage compartment for facelift vehicle model from 2020 to present.

No.Description
Fuse Holder A
2Windshield defroster
3Windshield defroster
5Suspension control
6Automatic transmission
7Rear window defogger
8Rear seat heating
9Left tail lights
10Airbag, driver’s side safety belt tensioner control module
11Luggage compartment lid lock, fuel filler door lock, convenience system control module
12Luggage compartment lid
Fuse Holder B
62020: Battery power interrupt
2021-2022: Electric compressor
Fuse Holder C
12021-2022: Exterior antenna
2Audi phone box
3Right front seat electronics, lumbar support, massaging seat
4Side assist
6Tire pressure monitoring system
7Convenience access and start authorization control module (NFC)
8Auxiliary heating, tank module
10TV tuner, data exchange and telematics control module
11Auxiliary battery control module
12Garage door opener
13Rearview camera, peripheral cameras
14Right tail lights
16Airbag, front passenger’s side safety belt tensioner control module
Fuse Holder E
3Exhaust treatment
5Right trailer hitch light
7Trailer hitch
8Left trailer hitch light
9Trailer hitch socket
10All wheel drive control module, sport differential
11Exhaust treatment

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