The fuse box diagram is a helpful tool for troubleshooting electrical problems in your Audi A8/S8 D2/4D from 1998 to 2002. It shows the location of each fuse in the fuse box, as well as the amperage rating and function of each fuse.
By understanding the fuse box diagram, you can quickly and easily identify which fuse may be blown when you are having an electrical problem. This can save you time and money by preventing you from having to take your car to a mechanic for every small electrical problem.
There are two fuse boxes in the Audi A8/S8 D2/4D from 1998 to 2002. The first fuse box is located under the left side of the dashboard. The second fuse box is located in the luggage compartment.
Table of Contents
Passenger Compartment
| Fuse Number | Fuse Amps | Description |
|---|---|---|
| ST1 | Fuse carrier 1, black | |
| ST2 | Fuse carrier 2, red | |
| ST3 | Fuse carrier 3, yellow | |
| ST4 | Fuse carrier 4, blue | |
| ST5 | Fuse carrier 5, brown | |
| 6 | Secondary air pump fuse | |
| 7 | Spare fuses | |
| 8 | Radiator fan fuse | |
| ST1-1 | 5A | Left side light/parking light, left tail light |
| ST1-2 | 5A | Right side light/parking light, right tail light |
| ST1-3 | 15A | Dipped beam headlight, right |
| ST1-4 | 15A | Dipped beam headlight, left, headlight range control |
| ST1-5 | 10A | Main beam headlight, left |
| ST1-6 | 10A | Main beam headlight, right, main beam warning lamp |
| ST1-7 | 15A | Hazard warning lights |
| ST1-8 | 15A | Dual tone horn |
| ST1-9 | 10A | Diagnostic socket (30a) |
| ST1-10 | 25A | Windscreen wiper system, automatic intermittent wash/ wipe relay |
| ST2-1 | 10A | Mirror heating |
| ST2-2 | 10A | Heated steering wheel |
| ST2-3 | 5A | Display and switch illumination, storage compartment, cup holder, number plate light |
| ST2-4 | 5A | Radiator fan relay, air quality sensor |
| ST2-5 | 15A | Front fog lights, rear fog light, fog lights/rear fog light control unit |
| ST2-6 | 30A | Heated rear window, air conditioner |
| ST2-7 | 5A | Steering angle sensor for ESP |
| ST2-8 | 10A | Hazard warning lights, terminal 75 |
| ST2-9 | 10A | Brake lights |
| ST2-10 | 5A | Heated washer jets |
| ST3-1 | 15A | Bulb monitoring, on-board computer, dash panel insert, parking aid, diagnostic socket (15a), tyre pressure monitor, multi-function steering wheel, headlight range control |
| ST3-2 | 5A | Telephone, telematics, navigation system with screen |
| ST3-3 | 15A | Cigarette lighter, front |
| ST3-4 | 10A | Air conditioner, parking aid, auxiliary heating radio wave receiver, multi-function steering wheel, dash panel insert, solar cell isolation relay, tyre pressure monitor |
| ST3-5 | 10A | Air conditioner |
| ST3-6 | 10A | Cruise control system, reversing lights |
| ST3-7 | 15A | Air conditioner, coolant pump |
| ST3-8 | 10A | Air conditioner compressor, magnetic coupling |
| ST3-9 | 5A | Multi-function steering wheel |
| ST3-10 | 20A | Additional heater control unit, auxiliary heater |
| ST4-1 | 20A | Fuel pump |
| ST4-2 | 30A | V8, V12: Ignition coils V6: Output stage |
| ST4-3 | 20A/10A | Lambda probe heating V8 TDI: Fuel pump |
| ST4-4 | 10A/15A | V8 TDI: Fuel cooling pump V6: Brake servo relay |
| ST4-5 | 5A | Navigation system NS Low |
| ST4-6 | 10A | Navigation system NS Low, chip card reader unit |
| ST4-7 | – | – |
| ST4-8 | 5A | Oil level thermo sender |
| ST4-9 | 25A | Control unit for ABS (ESP), terminal 30 |
| ST4-10 | 10A | Control unit for ABS, terminal 15 |
| ST5-1 | 10A | Illuminated vanity mirrors, central locking, indicator lights for anti-theft alarm system operation, interior lights, reading lamps |
| ST5-2 | 10A | Mirror adjustment, mirror retraction, control units for electric windows , toll pass, rear head restraint adjustment, potentiometer for seat heating, seat adjustment memory |
| ST5-3 | 10A | Entry and footwell lights, ultra-sonic sensor control unit, internal central locking switch, mirror and seat adjustment with memory function, luggage compartment release |
| ST5-4 | 10A | Central locking, automatic anti-dazzle interior mirror, rear roller blind, reading lamp relay |
| ST5-5 | 15A | Central locking |
| ST5-6 | 20A | Sliding/tilting sunroof |
| ST5-7 | 15A | Rear cigarette lighter, heated lock cylinders, adjustable front passenger’s seat |
| ST5-8 | Not used | |
| ST5-9 | 20A | Steering column and belt height adjustment |
| ST5-10 | 20A | Heated front seats, rear roller blind |
Relay Panels
| Relay Number | Description |
|---|---|
| 1 | Starter inhibitor relay-automatic gearbox Bridge connection on models with manual gearbox |
| 2 | Adjustable front passenger’s seat relay |
| 3 | Seat adjustment thermo-fuse 2 |
| 4 | Seat adjustment thermo-fuse 1 |
| 5 | Daytime driving light switch-on relay |
| 6 | Fuel cooling relay (TDI) |
| 7 | Hot air blower single fuse |
Micro-central electrics in electronics box (footwell)
| Relay Number | Description |
|---|---|
| 1 | X Contact relief relay |
| 2 | X contact relief relay |
| 4 | Relay for glow plugs (V6 TDI) Fuel pump relay (V6, V8, V12) Voltage supply relay (V8 TDI) |
| 5 | Electric fuel pump 2 relay (V8 TDI) Radiator fan relay (countries with hot climate, V12) Brake servo relay (V6) |
| 6 | Daytime driving light change-over relay |
Relay carrier in electronics box (footwell)
| Relay Number | Description |
|---|---|
| 1 | Bulb monitoring device |
| 2 | TDI engine: Fuel pump relay V8, V12 engine: Motronic current supply relay |
| 3 | Fog lights/rear fog light control unit |
| 4 | Automatic intermittent wash/wipe relay |
| 5 | Entry and footwell lighting relay |
| 6 | Bulb monitoring device |
| 7 | Coolant shut-off valve relay |
| 8 | Fog lights/rear fog light control unit |
| 9 | Automatic intermittent wash/wipe relay |
| 10 | Exterior mirror fold system control unit |
| 11 | Reading lamp relay |
| 12 | Servotronic control unit |
| 13 | Solar cell isolation relay |
| 14 | Magnetic coupling relay |
| 15 | Exterior mirror fold system control unit |
Relay carrier under the shelf on the driver’s side
| Relay Number | Description |
|---|---|
| 1 | Relay for ABS solenoid valves |
| 2 | ABS return flow pump relay |
| 3 | Multi-function steering wheel control unit |
| 4 | Multi-function steering wheel control unit |
| 6 | Hazard warning light relay Models with trailer coupling: Hazard warning light relay, trailer operation |
| 7 | Front electric window thermo-fuse |
| 8 | Rear electric window thermo-fuse |
Luggage Compartment Fuse Box
| Fuse Number | Description |
|---|---|
| 1 | Terminal 30 junction box |
| 2 | ABS hydraulic pump fuse |
| 3 | Heated seats single fuse |
| 4 | Terminal 30 fuse-trailer operation |
| 6 | Radio fuse Navigation fuse |
| 7 | ABS valves fuse |
| 9 | Telephone fuse |
| 14 | Seat adjustment fuse Models without rear seat adjustment: Rear head restraint adjustment fuse |
Engine Compartment Electronics Box
V6, V8 & V12 Petrol engines
| Fuse/Relay Number | Description |
|---|---|
| 1 | V12: Engine control unit fuse |
| 2a | V12: Secondary air pump relay 1 |
| 2b | V12: Secondary air pump relay 1 V6, V8: Automatic gearbox control unit fuse |
| 3 | V12: Injector fuse |
| 4 | V6, V8: Secondary air pump relay V12: Control element fuse V12: Coolant pump fuse |
| 5 | V12: Automatic gearbox control unit fuse |
| 6 | V6, V8: Injector fuse V12: Continued coolant circulation relay |
| 7 | V6, V8: Control element fuse V12: Continued coolant circulation relay |
| 8 | V12: Control element fuse 2 |
| 9 | V8: Engine control unit fuse V12: Secondary air pump relay 2 |
| 10 | V12: Secondary air pump relay 2 |
V6 diesel engines (TDI)
| Relay Number | Description |
|---|---|
| 1 | Fuse 1 for glow plugs-engine |
| 2a | Alternator cut-in relay |
| 2b | Alternator cut-in relay |
| 4 | Automatic gearbox control unit fuse |
| 5 | Fuse 2 for glow plugs-engine |
| 6 | Diesel direct injection system relay |
| 7 | Diesel direct injection system relay |
| 9 | Air mass meter fuse |
| 10 | Engine control unit fuse |
V8 Diesel engines (TDI)
| Fuse Number | Description |
|---|---|
| 1 | Regulating valve fuse |
| 2 | Glow plug relay 2 |
| 3 | Charge air cooling pump relay |
| 4 | Automatic gearbox control unit fuse |
| 5 | Coolant pump fuse |
| 6 | Alternator cut-in relay |
| 7 | Engine control unit fuse |
| 8 | Relay for glow plugs |
| 9 | Fuse 2 for glow plugs-engine |
| 10 | Fuse 1 for glow plugs-engine |
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Tom Smith is a passionate car mechanic and automotive enthusiast, specializing in the intricate world of car fuse boxes. With years of hands-on experience under the hood, he has earned a reputation as a reliable expert in his field. As the founder and content creator of the popular blog website 'carsfuse.com,' Tom has dedicated himself to sharing his extensive knowledge of car fuse boxes and electrical systems with the world.