Audi A3 2018 Fuse Box Info
Passenger compartment fuse box location:
The instrument panel fuse box is located behind a cover near the steering column.
Engine compartment fuse box location:
Fuse Box Diagram | Layout
Passenger compartment fuse box:
| Fuse/Relay N° | Functions |
| 1 | AdBlue engine components |
| 2 | Seat adjustment |
| 3 | Power top hydraulic pump |
| 4 | Infotainment control panel, Infotainment components |
| 5 | Gateway |
| 6 | Selector lever (automatic transmission) |
| 7 | Air conditioning/heating controls, auxiliary heating, rear window defogger relay, tire pressure monitor |
| 8 | Electromechanical parking brake switch, light switch, rain/light sensor, anti-theft alarm system, diagnostic connector, roof module, emergency cali system, headlight range control |
| 9 | Steering column switch module |
| 10 | Infotainment system display |
| 11 | Left vehicle electrical system control module |
| 12 | Infotainment components |
| 13 | Driver's side safety belt tensioner |
| 14 | Heating/air conditioning system blower |
| 15 | Electronic steering column lock |
| 16 | Infotainment components |
| 17 | Instrument cluster |
| 18 | Rearview camera |
| 19 | Convenience access control module |
| 20 | Engine components |
| 21 | Steering column, steering wheel heating switch module |
| 23 | Panorama glass roof/power top control module, power top latch |
| 24 | Right vehicle electrical system control module |
| 25 | Driver's side front/rear power windows |
| 26 | Seat heating |
| 27 | Interior lights |
| 28 | Power top control module |
| 29 | Interior lights |
| 30 | Diagnostic connector |
| 32 | Front camera, parking system, ACC sensor, lane change assist |
| 33 | Airbag |
| 34 | Hold assist button, interior sound, reversing light switch, temperature sensor, neck heating relay coil and socket relay, power top operation button |
| 35 | Air quality sensor, automatic dimming rearview mirror, diagnostic connector, center console power supply |
| 36 | Right headlight (LED, Matrix LED) |
| 37 | Left headlight (LED, Matrix LED) |
| 38 | High-voltage battery |
| 39 | Passenger's side front/rear power windows |
| 40 | Sockets |
| 41 | Passenger's side safety belt tensioner |
| 42 | Central locking area |
| 43 | Sound-amplifier |
| 44 | All wheel drive |
| 45 | Driver's side seat adjustment |
| 47 | Rear window wiper |
| 48 | Outer sound actuator |
| 49 | Clutch sensor (relay 1+2), high-voltage battery, power electronics |
| 52 | Control module for suspension control |
| 53 | Rear window defogger |
Engine compartment fuse box:
| Fuse/Relay N° | Functions |
| 1 | Electronic Stabilization Control (ESC) |
| 2 | Electronic Stabilization Control (ESC) |
| 3 | Engine control module |
| 4 | Engine components, engine cooling |
| 5 | Engine components, fuel tank system (diesel), CNC cut-off valve |
| 6 | Brake light switch |
| 7 | Engine components, water pumps, tank system (gasoline engine) |
| 8 | Heat oxygen sensor |
| 9 | Engine components, exhaust door, glow time control module(relay 6) |
| 10 | Fuel control module, fuel pump |
| 11 | Auxiliary heater heating element2, engine components, secondary air pump |
| 12 | Auxiliary heater heating element3, vacuum pump |
| 15 | Horn |
| 16 | Ignition coil (relay 8), power and control electronics |
| 17 | Electronic Stabilization Control (ESC), engine control module (relay 5) |
| 18 | Terminal 30 (voltage reference), battery monitoring |
| 19 | Windshield wipers |
| 21 | Automatic transmission |
| 22 | Terminal 50 diagnosis, engine control module |
| 23 | Starter |
| 24 | Auxiliary heater heating element 1, brake booster |
| 31 | Vacuum pump, water pump, high pressure pump, fuel injectors |
| 32 | Windshield defroster |
| 33 | Brake pressure reservoir, recuperation, transmission fluid pump |
| 34 | Brake booster |
| 35 | A/C function relay |
| 37 | Parking heater |
