Audi A3 8v (S3) – fuse and relay

The Audi A3’s third generation, designated 8v, was presented in 2012 and produced from 2013 to 2020, undergoing a restyling. This article provides information on the locations of the fuse boxes for the Audi A3 8v, including diagrams and descriptions of their purpose. Please note that the cigarette lighter fuse will be highlighted.

 audi a3 8v

Please note that the data presented in the following tables refers only to certain versions of the model and depends on its configuration. Check the assignment with yours on the back of the protective cover or other technical documentation.

Engine compartment fuse box

fuse box in the engine compartment A3 8p

To access, click on the mount and check the current description with yours on the back of the lid.

Photo for example

Photo fuse box A3 3G


fuse box diagram
fuse box diagram


1ESC control module
2ESC control module
3Engine control module (petrol / diesel)
4Engine cooling, engine components, auxiliary heater coil relay (1 + 2), secondary air fuel pump relay
5Engine components, reservoir system
6Brake signal sensor
7Engine components, water pumps
8Oxygen sensor
9Engine components, exhaust door, glow time control module, SULEV valve
10Fuel injectors, fuel control module
11Booster heater 2 heating element
12Booster heater heating element 3
13Automatic transmission control module
15Sound signal
16Ignition coil / power electronics (plug-in hybrid drive *)
17ESC control module, engine control module
18Terminal 30 (reference voltage)
20Sound signal
22Terminal Diagnostics 50
24Auxiliary heating element 1, brake booster (hybrid *)
31Vacuum pump / water pump (plug-in hybrid drive *)
32LED headlights
33Brake booster memory (hybrid *)
34Brake booster (hybrid *)
35Relay (plug-in hybrid *)

Passenger compartment fuse box

To access the box, open the glove compartment and you will see something like a pull rod.

real photo of the box

Having removed the cover with the help of the rods, you will see something similar.

 real photo of the block

Fuse box diagram

fuse block diagram a3


1Engine components
2Seat adjustment
3Hydraulic pump cover (convertible)
4MMI control panel, MMI components
6Selector (automatic transmission)
7Climate / heating control, autonomous heating, rear window defogger relay
8Diagnostics, electromechanical parking brake switch, light switch, rain and light sensor, communication unit with interior lighting (hybrid drive *) alarm
9Steering column switch module
11Driver’s side tensioning belts
12MMI area
13Shock adapter control module / service plug (plug-in hybrid drive *)
14Air conditioner fan
15Electronic steering column lock
16MMI area
17Instrument cluster
18Rear View Camera
19Convince Key System Control Module, Tank System
20Additional system
23Exterior lighting, heated washer fluid nozzles
24Panorama sunroof / Upper powertrain control module, Upper powertrain latch (Convertible)
25Doors / driver’s doors (e.g. power windows)
26Seat heating
27Amplifier sound
28Electric drive control module, electronics (convertible)
29Interior lighting
31Outdoor Lighting
32Driver assistance systems
33Air bag
34Button illumination, coils for upper cab heating relay (convertible) and socket relay, interior sound, reverse switch, temperature sensor
35Functional lighting, diagnostics, high beam assistant, air quality sensor, auto-dimming rearview mirror
36Right turn light / right LED light
37Left cornering light / left high beam headlamp
38High voltage battery (plug-in hybrid *)
39Side doors / front passenger doors (e.g. power windows)
40Sockets, Cigarette lighter
41Front passenger seat belt tensioner
42Central locking, windscreen washer
43Lanterns, lighting
44Four-wheel drive
47Rear window wiper
48External noise amplifier (Plug-in hybrid drive *)
49Starter, clutch sensor, headlamp relay coil, high voltage battery (hybrid *)
53Heated rear window

Fuse number 40 is responsible for the operation of the cigarette lighter.

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Comments 1

  • Can any please tell me which fuse controls the Windscreen Washer Pump on an Audi 8V 2018 model? I can’t see it listed here nor in my car owner’s handbook.

    I also note that you have both Fuse 15 and Fuse 20 in the engine bay marked as Sound Signal (which I assume is the Horn). My Audi handbook only shows that as Fuse 15 but doesn’t list Fuse 20.

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