Audi Q8 (2018 – 2022) – fuse and relay box diagram
This article covers to the Audi Q8 (B3), produced from 2018 to present. It includes fuse box diagrams for the 2018, 2019, 2020, 2021 and 2022 models, provides details on the location of the fuse panels inside the vehicle, and explains the function and layout of each fuse.
Year of production: 2018, 2019, 2020, 2021, 2022
Passenger compartment
Fuse box diagram (dashboard)
Assignment of the relays in the passenger compartment (dashboard)
| № | Description |
|---|---|
| A2 | Audi phone box, roof antenna |
| A3 | 2019: Climate control system, fragrance system, ionizer; 2020: Climate control system, fragrance system, particulate matter sensor 2021-2022: Climate control system, fragrance system |
| A4 | Head-up display |
| A5 | Audi music interface, USB sockets |
| A7 | Steering column lock |
| A8 | Upper/lower display |
| A9 | Instrument cluster |
| A10 | CD/DVD player |
| A11 | Light switch, switch panels |
| A12 | Steering column electronics |
| A13 | Volume control |
| A14 | MMI Infotainment system control module |
| A15 | Steering column adjustment |
| A16 | Steering wheel heating |
Fuse box diagram (Footwell)
Version 1
Version 2 (RHD)
Assignment of the relays in the passenger compartment (footwell)
| № | Description |
|---|---|
| Fuse panel A (brown) | |
| A1 | 2019: Not Used; 2020-2021: Catalytic converter heating 2022: Catalytic converter heating, camshaft adjustment |
| A2 | 2019-2021: Engine components 2022: Mass airflow sensor, heated oxygen sensors |
| A3 | 2019-2021: Engine components 2022: Motor heating, fuel injectors, exhaust doors |
| A4 | 2019-2021: Engine components 2022: Hot water pump, exhaust doors, NOX sensor, particulate sensor, biodiesel sensor |
| A5 | Brake light sensor |
| A6 | 2019-2021: Engine components 2022: Engine valves |
| A7 | 2019-2021: Engine components 2022: Heated oxygen sensor, mass airflow sensor |
| A8 | 2019-2021: Engine components 2022: High pressure pump, motor mount |
| A9 | 2019-2021: Engine components 2022: Motor components, motor relay |
| A10 | Oil pressure sensor, oil temperature sensor |
| A11 | 2019: Engine Start; 2020-2021: Engine components 2022: 48 volt coolant pump, 48 volt starter generator, 12 volt starter generator |
| A12 | 2019-2021: Engine components 2022: Engine valves |
| A13 | Engine cooling |
| A14 | Engine control module |
| A15 | 2019-2021: Engine sensors 2022: Heated oxygen sensors |
| A16 | Fuel pump |
| Fuse panel B (red) | |
| B1 | Ignition coils |
| B3 | 2019: Not Used; 2020-2022: High-voltage heating |
| B4 | 2019: Not Used; 2020-2022: Electric compressor |
| B5 | Engine mount |
| B6 | Windshield washer system control module |
| B7 | Instrument panel |
| B8 | Climate control system fresh air blower |
| B9 | Driver assist systems control module |
| B10 | Emergency call system |
| B11 | 2019-2021: Engine start 2022: Engine start, electric drive clutch |
| Fuse panel C (black) | |
| C1 | Front seat heating |
| C2 | Windshield wipers |
| C3 | Left headlight electronics |
| C4 | Panoramic glass roof |
| C5 | Left front door control module |
| C6 | Sockets |
| C7 | Right rear door control module |
| C9 | Right headlight electronics |
| C10 | Windshield washer system/headlight washer system |
| C11 | Left rear door control module |
| C12 | Parking heater |
| Fuse panel D (brown) | |
| D1 | 2019-2020: Seat ventilation, seat electronics, rearview mirror, rear climate control panel, diagnostic connector 2021-2022: Seat ventilation, seat electronics, rearview mirror, rear climate control system control panel, diagnostic connection, traffic information antenna (TMC) |
| D2 | 2019: Climate control module, gateway control module; 2020-2022: Vehicle electrical system control module, gateway control module |
| D3 | Sound actuator/exhaust sound tuning |
| D4 | 2019: Transmission heating valve, Transmission fluid cooling valve; 2020-2022: Transmission fluid cooling valve |
| D5 | 2019-2021: Engine start 2022: Engine start, electric drive |
| D8 | 2019: Night vision assist; 2020-2022: Night vision assist, active roll stabilization |
| D9 | 2019-2020: Adaptive cruise assist, front radar 2021-2022: Adaptive cruise assist, front wheel sensors |
| D10 | 2019: Not Used; 2020-2022: Exterior sound |
| D11 | Intersection assistant, driver assist systems |
| D13 | Left headlight |
| D15 | 2021-2022: USB input |
| Fuse panel E (red) | |
| E1 | Anti-theft alarm system |
| E2 | Engine control module |
| E3 | Front seat electronics, lumbar support |
| E4 | Automatic transmission selector lever |
| E5 | Horn |
| E6 | Parking brake |
| E7 | Gateway control module (diagnosis) |
| E8 | 2019: Interior headliner lights; 2020-2022: Roof electronics control module |
| E9 | 2019: Not Used; 2020-2022: Drivetrain generator |
| E10 | Airbag control module |
| E11 | 2019: Electronic Stabilization Control (ESC); 2020-2022: Electronic Stabilization Control (ESC), Anti-Lock Braking System (ABS) |
| E12 | Diagnostic connector, light/rain sensor |
| E13 | Climate control system |
| E14 | Right front door control module |
| E15 | 2019: Climate control system, body electronics; 2020-2022: Climate control system compressor |
| E16 | 2022: Brake system pressure reservoir |
Luggage compartment
Fuse box diagram
Assignment of the relays in the luggage compartment
| № | Description |
|---|---|
| Fuse panel A (black) | |
| A1 | 2019: Not Used; 2020-2021: High-voltage heating, thermomanagement |
| A5 | Air suspension/damping |
| A6 | Automatic transmission |
| A7 | 2019: Rear seat heating; 2020-2021: Rear seat heating, control panel for rear climate control |
| A9 | Central locking, left tail light |
| A10 | Front belt tensioner on driver’s side |
| A11 | 2019: Central locking, rear blind; 2020-2021: Luggage compartment lid central locking, fuel filler door, luggage compartment cover |
| A12 | Luggage compartment lid control module |
| Fuse panel B (red) | |
| B1 | Rear climate control system blower |
| B2 | Sound-amplifier |
| B3 | Exhaust treatment, sound actuator |
| B4 | Rear climate control system control panel |
| B5 | Right trailer hitch light |
| B6 | Trailer hitch positioning motor |
| B7 | Trailer hitch release |
| B8 | Left trailer hitch light |
| B9 | Trailer hitch socket |
| B10 | All wheel drive sport differential |
| B11 | Exhaust treatment |
| B12 | Driver’s side rear safety belt tensioner |
| Fuse panel C (brown) | |
| C1 | Driver assist systems control module |
| C2 | Audi phone box |
| C3 | 2019: Right front lumbar support; 2020-2021: Front seat electronics, right lumbar support 2022: Right lumbar support |
| C4 | Side assist |
| C6 | Tire pressure monitoring system |
| C7 | 2021-2022: Exterior antenna |
| C8 | 2019: Fuel tank monitoring; 2020-2022: Parking heater radio receiver, fuel tank monitoring |
| C10 | 2019: TV tuner; 2020-2022: TV tuner, data exchange and telematics control module |
| C11 | Convenience access and start authorization control module |
| C12 | Garage door opener |
| C13 | Rearview camera, peripheral cameras |
| C14 | 2019: Central locking, tail lights; 2020: Right tail light, comfort system 2021-2022: Convenience system control module, right tail light |
| C15 | Passenger’s side rear safety belt tensioner |
| C16 | Front belt tensioner on front passenger’s side |
| Fuse panel D (red) | |
| D1 | 2020-2022: Active roll stabilization |
| D2 | 2022: High-voltage battery |
| D3 | 2022: High-voltage battery coolant pump |
| D4 | 2022: Power electronics control module |
| D5 | 2019: Brake system 2022: Brake booster |
| D6 | Voltage converter |
| D7 | 2022: Engine start |
| D8 | 2022: Climate control system compressor |
| D9 | Auxiliary battery control module |
| D10 | 2022: High-voltage battery |
| D11 | 2022: Charging system |
| D12 | 2022: Auxiliary heating and air conditioning radio receiver |
| D14 | 2022: Thermal management, coolant pumps |
| D15 | 2020-2022: Thermomanagement control module |
| Fuse panel E (brown) | |
| E7 | 2019: Front seat heating; 2022: Front seat heating |
| E9 | 2019: Exhaust treatment; 2022: Exhaust treatment |
| E10 | 2022: Rear seat heating, rear climate control system controls |
| E12 | 2019: Exhaust treatment; 2022: Exhaust treatment |
WARNING: Terminal and harness assignments for individual connectors will vary depending on vehicle equipment level, model, and market.