Audi A4 and S4 B9 / 8W (2022) – fuse box

Audi A4 and S4 B9 / 8W – fuse box diagram

Year of production: 2022.


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.

Color Amperes [A]
Black 1
Purple 3
Light brown 5
Brown 7.5
Red 10
Blue 15
Yellow 20
White or transparent 25
Green 30
Orange 40

Location of the fuse box

Driver’s footwell (right-hand steering wheel)


Front passenger footwell (right-hand drive)

Assignment of fuses in the passenger compartment

Number Description
Brown panel A
1 Catalyst heating
2 Engine components
3 Exhaust doors;

Fuel injectors;

An air inlet;

Engine heating.

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 air flow sensor;

Water pump.

8 The water pump;

High pressure pump;

High pressure regulating valve;

Temperature valve;

Engine mount.

9 Hot water pump;

Engine relay.

48V drive system generator;

48V water pump.

10 Oil pressure sensor;

Oil temperature sensor.

11 Clutch pedal position sensor;

Engine start;

The water pump;

48V drive system generator;

12 V drive system generator.

12 Engine valves;

Mounting the engine.

13 engine cooling
14 Fuel injectors;

Engine control module.

15 Ignition coils;

Heated oxygen sensor.

16 Fuel pump
Red panel B.
1 Anti-theft alarm system
2 Engine control module
3 Lumbar support;

Front left seat electronics;

Armchair massage.

4 Automatic transmission selection mechanism
5 Horn
6 Electromechanical parking brake
7 CAN gate control module
8 Electronic control module under the ceiling
9 Emergency call system;

Communication module.

10 Airbag control module
11 Electronic Stability Control (ESC);ABS.
12 Diagnostic connector;

Light and rain sensor.

13 Air conditioning, heating and ventilation control system
14 Right front door control module
15 Air conditioning compressor
16 Brake pressure reservoir
Black panel C.
1 Front seat heating
2 Windshield wipers
3 Left headlight electronics
4 Panoramic glass sunroof / sliding / tilting sunroof
5 Left front door control module
6 12V power socket
7 Right Rear Door Control Module;

Right rear window actuator.

8 AWD Control Module (4WD)
9 Right headlight electronics
10 Windscreen washers;

Headlight washers.

11 Left rear door and window control module
12 Auxiliary heating
Black panel D
1 Front seat electronics;

Seat ventilation;

Rearview mirror;

Rear air conditioning, heating and ventilation control system;

Windshield defogger;

CAN diagnostics.

2 CAN gateway;

Air conditioning, heating and ventilation control system.

3 Sound generator
4 Clutch pedal position sensor
5 Engine start;

Emergency shutdown.

6 CAN gateway;

Traffic Information System (TMC).

7 USB charging port
8 Homelink (garage door opener)
9 Adaptive cruise control;

Distance adjustment.

11 Video camera
12 Matrix LED headlight and right-hand LED headlight
13 Matrix LED headlight and left LED headlight
14 Transmission fluid cooling valve
15 Alarm;

Loudspeeker sysetm.

Red panel E.
1 Ignition coils
2 Air conditioning compressor
5 Left headlight
6 Automatic Transmission
7 Instrument panel
8 Air conditioning system (fresh air blower)
9 Right headlight
10 Dynamic steering
11 Engine start

Driver’s side cockpit

Assignment of fuses in the cockpit on the driver’s side

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Number Description
1 Opening and Starting the Vehicle (NFC)
2 Audi Phonebox;

Charger for mobile devices.

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 Particulate sensor for the air conditioning system
14 Infotainment system
16 Steering wheel heating;

Steering column electronics.

Left side of the trunk

Assignment of fuses in the trunk

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Number Description
Black panel A
2 Windshield defroster
3 Windshield defroster
5 Suspension control
6 Automatic Transmission
7 Rear window defogger
8 Rear seat heating
9 Rear lights on the left
10 Airbag module
11 Electric trunk lid;

Fuel filler flap;

Comfort access system module.

12 Electric trunk lid
Red panel B.
6 Electric compressor;

Battery power cut.

Brown panel C.
1 External antenna
2 Audi Phonebox
3 Lumbar support;

Front right seat electronics;

Armchair massage.

4 Audi side assistant
6 Tire pressure monitor
7 Opening and starting the vehicle (NFC)
8 Parking heater radio receiver;

Intelligent module (fuel tank).

10 TV tuner;

CAN gateway.

11 Additional battery module
12 Homelink (garage door opener)
13 Rear view camera;

Peripheral cameras.

14 Right rear lights
16 Airbag system;

Passenger belt pretensioner.

Red panel E.
3 AdBlue
5 Trailer hitch (right light)
7 Towbar
8 Trailer hitch (left light)
9 Trailer hitch (socket)
10 Sports differential;

4-wheel drive.

11 Exhaust gas treatment, AdBlue
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