Table of Contents
The A8 is a luxury vehicle manufactured by Audi AG in Neckarsulm, Germany, and serves as the successor to the V8. This document provides a detailed analysis of the fuse and relay circuits for the third-generation Audi A8 / S8 (chassis code 4H), covering the 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, and 2018 model years, equipped with 2.0 TFSI Hybrid, 3.0 TDI, 3.0 TFSI, 4.0 FSI, 4.2 FSI, 4.2 TDI, or 6.3 W12 engines.
The fuses for the “Cigarette lighter” and “Fuel pump” are highlighted in bold.
Luggage Compartment
The fuse panel is located behind a plastic trim cover.
Example of panel access.
| Diagram | ||
|---|---|---|
|
||
| No. | Description | A |
| 1 | TCS/ESC switch | 5 |
| Headlight range control module | ||
| Power management control module | ||
| Diagnostic connector (16-pin) | ||
| 2 | Data bus diagnostic interface (Gateway) | 5 |
| 3 | Adaptive suspension control module | 5 |
| 4 | Parking aid control module | 5 |
| 5 | Steering column electronics control module | 5 |
| 6 | Control module | 5 |
| 7 | Airbag control module | 5 |
| Passenger airbag deactivation indicator | ||
| “Seat occupied” recognition control module | ||
| 8 | Garage door opener control module | 5 |
| Night vision assist control module | ||
| Air quality control module | ||
| Heated washer nozzles | ||
| All-Wheel Drive (AWD) control module | ||
| 9 | Electromechanical parking brake control module | 5 |
| 10 | Trailer detection control module | 5 |
| Refrigerator | ||
| Seat heating control module | ||
| Auto-dimming rearview mirror | ||
| 11 | Active steering control module | 5 |
| 12 | Selector lever control module | 5 |
| 13 | Lane change assist control module | 5 |
| 14 | Engine Control Module (ECM) | 5 |
| 15 | Starter relay | 40 |
| 16 | Headlight range control module | 5/10 |
| Left headlight power control module | ||
| 17 | Seat belt pretensioner control module | 25 |
| 18 | Seat belt pretensioner control module | 25 |
| 19 | Engine Control Module (ECM) | 5 |
| 20 | Voltage stabilizer | 7.5 |
| 21 | Camera control module | 7.5 |
| 22 | Right headlight power control module | 10 |
| 23 | Anti-lock Braking System (ABS) control module | 5 |
| A/C compressor | ||
| 24 | Crankcase ventilation heater | 7.5 |
| Emergency shut-off relay | ||
| Voltage stabilizer | ||
| Engine mount control module | ||
| Structure-borne sound control module | ||
| 25 | Adaptive Cruise Control (ACC) | 10 |
| Battery | ||
| 26 | Transmission Control Module (TCM) | 5 |
| Transmission Control Module (TCM) | ||
| CAN bus network controller | ||
| 27 | Air quality sensor | 5 |
| A/C refrigerant pressure and temperature sensor | ||
| Humidity sensor | ||
| 28 | Special vehicle equipment | 5 |
| 29 | Electromechanical parking brake | 5 |
| 30 | Spare | 5 |
| 31 | Rear right door control module | 7.5 |
| 32 | Evaporative emission (EVAP) leak detection control module | 5 |
| Fuel tank pressure sensor | ||
| Telephone module | ||
| 33 | Climatronic control module | 15 |
| 34 | A/C control module | 10 |
| 35 | Data bus diagnostic interface (Gateway) | 5 |
| 36 | Refrigerator | 15 |
| 37 | Special functions interface module | 5 |
| 38 | Telephone adapter, Bluetooth handset | 5 |
| 39 | Engine mount control module | 15 |
| 40 | Selector lever control module | 10 |
| 41 | Comfort system central control module | 10 |
| 42 | 20 | |
| 43 | Fuel pump control module | 25 |
| 44 | Electromechanical parking brake control module | 30 |
| 45 | Empty | |
| 46 | 12V power outlet | 20 |
| 47 | Rear cigarette lighter | 20 |
| Additional 12V power outlets | ||
| 48 | Front cigarette lighter | 20 |
| DC/AC inverter with 230V socket | ||
| 49 | Adaptive suspension control module | 15 |
| 50 | DC/AC inverter with 230V socket | 15 |
| 51 | Electromechanical parking brake control module | 30 |
| 52 | Seat heating control module | 25 |
| A/C control module | ||
| Heated rear seat switch | ||
| 53 | Comfort system central control module | 20 |
| 54 | A/C blower control module | 20 |
| 55 | Comfort system central control module | 20 |
| 56 | Spare | 30 |
| 57 | Rear seat adjustment | 5 |
| Seat remote control unit | ||
| 58 | Radiator fan relay | 35 |
| 59 | Seat adjustment | 7.5 |
| 60 | Trailer detection control module | 25/30 |
| Trailer connector | ||
| 61 | Trailer detection control module | 20/25 |
| Trailer connector | ||
| 62 | Seat adjustment | 30 |
| 63 | Seat adjustment | 30 |
| 64 | Trailer detection control module | 20/25 |
| Trailer connector | ||
| 65 | Trailer detection control module | 15 |
| Trailer connector | ||
| 66 | Seat adjustment | 7.5 |
| 67 | Battery supply | 15 |
| 68 | Empty | - |
| 69 | Audio system control module | 30 |
| Voltage stabilizer | ||
| Radio module | ||
| 70 | Audio system control module | 30 |
| 71 | Multimedia control module | 10 |
| Voltage stabilizer | ||
| Information display control module | ||
| Information display | ||
| 72 | Tire Pressure Monitoring System (TPMS) control module | 5 |
| 73 | Rearview camera control module | 5 |
| Auto-dimming rearview mirror | ||
| 74 | DVD player | 5 |
| 75 | TV tuner | 5 |
| 76 | Information display control module | 7.5 |
| 77 | Control panel | 5 |
| Analog clock | ||
| 78 | Vehicle information system control module | 5 |
| 79 | Radio module | 7.5 |
| 80 | Telephone module | 5 |
| Key card reader / ignition reader | ||
| Rearview camera control module | ||
| 81 | Empty | - |
| 82 | Spare | 80 |
| 83 | Spare | 110 |
| 84 | Rear window defogger | 40 |
| 85 | Air suspension leveling system | 40 |
| 86 | Engine start/stop switch | 40 |
| 87 | Front passenger seat adjustment | 15 |
| R1 | Adaptive suspension compressor relay | |
| R2 | Rear window defogger relay | |
| R3 | Auto-dimming rearview mirror | |
| Radiator fan relay | ||
| R4 | Fuel pump relay | |
| R5 | Engine starter relay | |
| R6 | Terminal 15 power supply relay | |
| R7 | Power outlet relay | |
Auxiliary Fuse Holder
An auxiliary fuse holder is located adjacent to the main panel.
| Diagram | ||
|---|---|---|
|
||
| 1 | Reductant heater (AdBlue®) | 30 |
| 2 | Reductant dosing system (AdBlue®) | 10 |
| R1 | Reductant dosing system relay (AdBlue®) | |
Passenger Compartment
Passenger Side
The first fuse panel is located behind the side cover of the dashboard on the passenger side.
| Diagram | ||
|---|---|---|
|
||
| No. | Description | A |
| 1 | Anti-theft alarm system | 5 |
| 2 | Transmission Control Module (TCM) | 15 |
| 3 | Front HVAC blower motor | 40 |
| 4 | Engine management power supply | 35 |
| 5 | Empty | - |
| 6 | Engine Control Module (ECM) | 5 |
| 7 | Front right door control module | 7.5 |
| 8 | Front passenger power window | 30 |
| 9 | Electronic Stability Control (ESC) module | 10 |
| 10 | 25 | |
| 11 | Rear right power window | 30 |
| 12 | Front passenger seat (pneumatics) | 15 |
Driver Side
The second fuse panel is located behind the side cover of the dashboard on the driver side.
| Diagram | ||
|---|---|---|
|
||
| Panel (B) | ||
| No. | Description | A |
| 1 | Headlight switch | 5 |
| 2 | Emergency start (key reader) | 5 |
| 3 | Rear left door control module | 7.5 |
| 5 | Horn | 15 |
| 6 | Overhead interior lighting | 7.5 |
| 8 | Steering column stalks, heated steering wheel, multifunction steering wheel | 10/5 |
| 10 | Steering column adjustment | 5 |
| 11 | Driver door control module | 7.5 |
| 12 | Diagnostic connector, rain/light sensor | 10 |
| 14 | Steering column adjustment | 25 |
| 15 | Power steering, A/C compressor | 20 |
| 16 | Brake booster | 15 |
| Panel (C) | ||
| 1 | Heated front seats | 30 |
| 2 | Windshield wipers | 30 |
| 3 | Front exterior lighting | 30 |
| 4 | Sunroof | 20 |
| 5 | Driver power window | 30 |
| 6 | Driver seat (pneumatics) | 15 |
| 7 | Panoramic sunroof | 20 |
| 8 | Dynamic steering system | 35 |
| 9 | Front exterior lighting | 30 |
| 10 | Windshield washer, headlight washer system | 35 |
| 11 | Rear left power window | 30 |
| 12 | Panoramic sunroof | 40 |
Engine Compartment
The main distribution box is located on the right side of the engine compartment (facing forward), under the protective cover.
| Diagram | ||
|---|---|---|
|
||
| No. | Description | A |
| 1 | Mass Air Flow (MAF) sensor | 5 |
| 2 | Empty | - |
| 3 | Empty | - |
| 4 | Engine Control Module (ECM) 1 | 15 |
| Engine Control Module (ECM) 2 | ||
| 5 | Radiator fan control module | 5 |
| Fuel pump control module | ||
| Radiator fan | ||
| Fuel pump relay | ||
| 6 | Brake light switch | 5 |
| 7 | Glow plug control module | 10 |
| Left electro-hydraulic engine mount | ||
| Transmission mount solenoids | ||
| Transmission fluid cooling valve | ||
| 8 | Oil level and temperature sensor | 5 |
| 9 | Transmission mount solenoids | 10 |
| Fuel pressure regulating valve | ||
| Fuel metering valve | ||
| 10 | Oxygen (O2) sensors | 15 |
| 11 | Glow plug control module | 15 |
| Right electro-hydraulic engine mount solenoid | ||
| EGR cooler bypass valve | ||
| Oil pressure control valve | ||
| Coolant bypass valve | ||
| Special connector | ||
| Transmission mount solenoids | ||
| 12 | EGR coolant pump | 15 |
| Coolant circulation pump | ||
| 13 | Glow plugs | 80 |
| 14 | Glow plugs | 50 |
| R8 | Glow plug control module relay | |
| R9 | ||
Auxiliary Fuse Holder
The auxiliary fuse holder is located behind the front fascia in the engine compartment.
| Diagram | ||
|---|---|---|
|
||
| No. | Description | A |
| 1 | Radiator fan | 40/60 |
| 2 | 40/60 | |