The Audi A8 and S8, produced between 1994 and 2002, are luxury sedans known for their innovative technology and high performance. Along with their luxurious features, these models also boast an advanced electrical system that includes a fuse box and relay. In this guide, we will provide an overview of the electrical components found in the Audi A8 and S8 models, as well as tips for troubleshooting common issues.

Fuse Box

The fuse box in the Audi A8 and S8 models is located on the driver’s side of the dashboard, behind a plastic cover. The fuse box contains various fuses that protect electrical components from damage caused by power surges and other electrical issues. In some cases, a blown fuse can cause a specific electrical component to malfunction or stop working altogether. If this happens, it’s important to consult the owner’s manual or a professional mechanic to determine which fuse needs to be replaced.

Relay

In addition to the fuse box, the Audi A8 and S8 also have a relay, which is an electrical component that helps control various systems throughout the car. The relay acts as a switch, turning components on and off as needed. If a relay fails, it can cause a variety of issues, such as a malfunctioning air conditioning system or a non-functioning power window. In some cases, a relay can be replaced easily by a skilled DIYer or a professional mechanic. However, it’s important to properly diagnose the issue before attempting any repairs to avoid damaging other electrical components.

MUST READ: DYI – How to Check Car Fuses?

(1994-2002) Audi A8 and S8 fuse box and relay with Diagram

Passenger Compartment Fuse Box

audi a8 and s8 1994 2002 passenger compartment fuse box
audi a8 and s8 1994 2002 passenger compartment fuse box
No.AProtected Component
 
15Lamp Control Module, Left Parking Light, Left Front Side Marker Light, Instrument Cluster Combination Processor
25Lamp Control Module, Right Parking Light, Right Front Side Marker Light, Tail Lights, Licence Plate Lights, Instrument Cluster Combination Processor
315’97-’03: Right Headlamp (Low Beam), Lamp Control Module
10Right Headlamp (Low Beam), Lamp Control Module
415’97-’03: Left Headlamp (Low Beam), Headlight Aiming System, Lamp Control Module
10Left Headlamp (Low Beam), Headlight Aiming System, Lamp Control Module
510Left Headlamp (High Beam), Front/Rear Foglight Control Module
610Right Headlamp (High Beam), High Beam Indicator Light
715Emergency Flasher Switch
815Horn
910’00-’03: Data Link Connector
5’98-’99: Data Link Connector, Selector Lever Light Relay
5-’97: Instrument Cluster, Solar Cell Separation Relay
1025Windshield Wiper Washer Switch, Windshield Wiper Washer Intermittent Relay
 
1110Outside Mirrors
1210’00-’03: Heated Steering Wheel, Steering Wheel Control Module
5?: Shift Lock Relay
135A/C Control Head, Cigarette Lighter, Fog Light Relay, Glove Compartment Light, Instrument Cluster, Instrument Cluster Combination Processor, Tail Lights, Ashtray Light, Rear Ashtray Light, Multifunction Transmission Range Switch, Automatic Transmission Console Light, Licence Plate Lights, Illumination For Storage Tray, Cup Holder & Coin Holder, Selector Lever Light Relay Protection Diode, Interior Lights System, Light Switch
145First Speed Coolant Fan Control Relay, Second Speed Coolant Fan Control Relay, Third Speed Coolant Fan Control Relay, Air Quality Sensor (’98-’03)
1515Fog Light Switch, Rear Fog Light Switch, Fog Light Control Module
1630’97-’03: Rear Window Defogger Switch, Mirror Defogger, A/C Control Head (’00-’03)
25?: Rear Window Defogger Switch, Mirror Defogger
175’00-’03: Steering Angle Sensor
10?: Back-Up Light
1810Emergency Flasher Switch
1910Stop Lamp Switch, Vacuum Pump Valve, Transmission Control Module
205Washer Nozzle Heaters
 
2115Data Link Connector, Instrument Cluster, Lamp Control Module, Steering Wheel Control Module, Radio, Headlight Beam Adjustment Motors, Headlight Beam Adjustment Control Module, Parking Aid Control Module, Tire Pressure Monitoring Control Module, Air Bag Malfunction Indicator Lamp, ABS Malfunction Indicator Lamp, Traction Control Indicator Lamp
225’00-’01: Telephone Transceiver, Radio
10-’98: Telephone Transceiver
2315-’01: Cigarette Lighter
2410’00-’03: A/ C Control Head, Instrument Cluster Combination Processor, Parking Aid Control Module, Solar Cell Separation Relay, Steering Wheel Control Module, Tire Pressure Monitoring Control Module
5’97-’99: Instrument Cluster Combination Processor
5?: A/ C Control Head
2510’00-’03: A/C Control Head
15-’99: A/C Control Head, Interior Temperature Sensor, Instrument Cluster, Solar Cell Separation Relay, Steering Wheel Control Module
2610’97-’03: Multifunction Transmission Range Switch, Shift Lock Solenoid
5?: Multifunction Transmission Range Switch, Shift Lock Solenoid, Cruise Control System
2715Coolant Pump, Heat Regulating Valves
2810’00-’03: A/C Clutch Relay
15-’97: Coolant Pump, Auxiliary Heater
295’00-’03: Steering Wheel Control Module
10-’99: Steering Wheel Control Module
30– –
 
3120’00-’03: Fuel Pump
15-’99: Fuel Pump
3230’00-’03: Fuel Injectors, Ignition Coils, Valves No. 1 & 2 for Camshaft Adjustment (’01-’03)
20-?: Heated Oxygen Sensors Before TWC, EVAP Leak Detection Pump
3320Heated Oxygen Sensors Before TWC, EVAP Leak Detection Pump, Mass Air Flow Sensor
3415-’99: Heated Oxygen Sensors After TWC
355’00-’03: Navigation Control Unit
5-?: Auxiliary Heater
3610’00-’03: Navigation Control Unit
15-?: Auxiliary Heater
37– –
385’00-’03: Oil Level Thermal Sensor
3925’00-’03: ABS Control Module
5-’99: ABS Control Module
4010ABS Control Module, Anti-Slip Control Switch (with FWD), Brake Vacuum Vent Valve, ARS/ESP Switch, Stop Lamp Switch (Quattro)
 
4110Front Interior Light, Rear Reading Lights, Central Locking/Alarm System/Interior Light Delay Control Module, Central Locking SAFE Warning Light, Left Front Reading Light, Interior & Map/Reading Relay, Passenger Compartment Monitoring Switch, Make Up Mirror Lights, Door Warning Lights, Power Trunk Release, Power Rear Sunshade
4210Right & Left Power Windows Control Module, Mirror Adjustment Switch, Mirror Fold-Away Function Control Module, Memory Program Switch, Rear Headrest Adjustment Switch, Front Heated Seat Switches, Rear Heated Seat Switch, Front Seat Memory Switch
4315’00-’03: Luggage Compartment Release Switch, Right & Left Make Up Mirror Lights, Right & Left Make Up Mirror Lights Switch, Entry/Floor Light Relay, Interior Monitoring Sensors Control Module, Driver’s Side Interior Lock Switch, Mirror Memory Control Module, Memory Program Switch, Passengers Seat Memory Program Switch, Ultra Sound Sensors Control Module, Right Reading Light/Map Light, Left Reading Light, Interior Lights
10’99: Luggage Compartment Release Switch, Right & Left Make Up Mirror Lights, Entry/Floor Light Relay, Interior Monitoring Sensors Control Module, Driver’s Side Interior Lock Switch, Mirror Memory Control Module, Memory Program Switch, Rear Fog Light Switch
4410Central Locking/Alarm System/Interior Lights Delay Control Module, Rear Window Shade Switch, Automatic Dimmer Inside Mirror, Garage Door Control Module, Interior & Map/Reading Light Relay
4515Central Locking/Alarm System/Interior Lights Delay Control Module, Interior Monitoring Sensors Control Module, Driver’s Side Interior Lock Switch
4620Power Sunroof Control Module
4715Window Lockout Switch, Right & Left Heated Door Lock Control Module, Cigarette Lighter
4810-’97: Memory Program Switch, Mirror Memory Control Module
4920Steering Column/Belt Height Control Module, Steering Column Adjustment Switch
5020Front Heated Seat Switch, Rear Window Shade Control Module
 
5160-’00: Cooling Fan
50???
5260’01-’03: Cooling Fan

Passenger Compartment Relay Box No.1

audi a8 and s8 1994 2002 passenger compartment relay box
audi a8 and s8 1994 2002 passenger compartment relay box
No.Relay
R1’00-’03: Horn (J4)
-’99: Load Reduction (J59)
R2’00-’03: Load Reduction (J59)
-’99: Horn (J4)
R3-’99: Headlight Washer System (J39)
R4’00-’03: Fuel Pump (J17)
-’99: Staring Interlock (J207)
-’99: Starter Inhibitor and Reversing Light (J226)
R5-’99: Automatic Intermittent Wiper/Washer (J31)
R6-’99: Fuel Pump (J17)

Passenger Compartment Relay Box No.2

audi a8 and s8 1994 2002 passenger compartment relay box 2
audi a8 and s8 1994 2002 passenger compartment relay box 2
No.Relay
R1Mirror Fold (J351)
R2A/C Clutch (J44)
R3Solar Cell Separation (J309)
Selector Lever Light (J307)
Selector Lever Illumination Diode (J443)
R4Servotronic Control Module (J236)
R5Interior and Map/Reading Light (J91)
Selector Lever Lock Control Unit (J221)
R6Wiper/Washer Intermittent (J31)
Fog Light (J5)
R7(R7+R12): Front/Rear Fog Light Control Module (J512)
Daytime Running Lights Change-Over (J89)
Staring Interlock (J89)
R8Auxiliary Heater (J8)
R9Bulb Monitoring Device (J123)
R10Entry & Floor Light (J348)
R11Wiper/Washer Intermittent (J31)
Solar Cell Isolation (J309)
R12(R7+R12): Front/Rear Fog Light Control Module (J512)
Fresh Air Blower (J13)
R13Automatic Sliding Sunroof Close (J356)

Passenger Compartment Relay Box No.3

audi a8 and s8 1994 2002 passenger compartment relay box 3
audi a8 and s8 1994 2002 passenger compartment relay box 3
No.AProtected Component
340Blower Fan
4– –
5– –
6– –
7– –
Circuit Breaker
130Power Seat (No.2)
230Power Seat (Memory) (No.1)
Relay
R1Starting Interlock (J207)
Entry and Footwell Lighting (J348)
R2 –
R3Daytime Running Lights (J90)
R4Driving Lights (Litronic) (J336)

Passenger Compartment Relay Box No.4

audi a8 and s8 1994 2002 passenger compartment relay box 4
audi a8 and s8 1994 2002 passenger compartment relay box 4
No.AProtected Component
3– –
4– –
Circuit Breaker
130Power Window (Rear)
230Power Window (Front)
Relay
R1Hazard Warning Light (J2)
Turn Signal (J1)
R2(R2+R5) Multi-Function Steering Wheel (J453)
Second Speed Coolant Fan Control (J101)
(R2+R5) Electric Windows and Sliding Sunroof (J139)
R3ABS Return Flow Pump (J105)
Horn (J4)
Second Speed Coolant Fan Control (J101)
R4Automatic Window Closing (J261)
R5(R2+R5) Multi-Function Steering Wheel (J453)
Coolant Fan Control Relay (First Speed) (J26)
(R2+R5) Electric Windows and Sliding Sunroof (J139)
R6ABS Solenoid Valve (J106)
Load Reduction (J59)
Coolant Fan Control Relay (First Speed) (J26)

Luggage Compartment Fuse Box

audi a8 and s8 1994 2002 luggage compartment fuse box
audi a8 and s8 1994 2002 luggage compartment fuse box
No.AProtected Component
120Heated Seats, Right & Left Rear Seat Regulating Switch
225ABS Valves
20Radio, Amplifier, Right & Left Rear Woofers, Power Antenna
35/15Telephone
4– –
520Power Seat
620Trailer Tow
725ABS Valve
20Radio
15Radio
8– –
9– –
1020Power Seat
1150ABS Control Module
60ABS Control Module
12– –
1360Auxiliary Heater
60Second Battery
14– –
15– –
16– –
Relay
R1(4+9) Battery Isolation (J7)

Engine Compartment Fuse Box

audi a8 and s8 1994 2002 engine compartment fuse box
audi a8 and s8 1994 2002 engine compartment fuse box
No.AProtected Component
115Transmission Control Module
215EVAP Canister Purge Regulator Valve, Intake Change Over Valve, Fuel Injector Air Control Valve & EVAP Leak Detection Pump
15ECM & Fuel Injectors
315ECM & Fuel Injectors
20EVAP Canister Purge Regulator Valve, Intake Manifold Tuning Valve No. 1, Intake Manifold Tuning Valve No. 2, Fuel Injector Air Control Valve & EVAP Leak Detection Pump, Secondary Air Injection, Electrohydraulic Engine Mounts, MAF Sensor, Camshaft Adjustment Valves, (Control Elements).
420ECM & Ignition Coil Terminal No. 15
5ECM
515Transmission Control Module
Relay
R1Immobilizer (J341)
R2Engine Control Module (J271)
Secondary Air Injection Pump (J299)

In conclusion, the Audi A8 and S8 1994-2002 are luxurious vehicles that come equipped with advanced electrical components, including a fuse box and relay. While these components can provide reliable performance for years, they may require maintenance or repair from time to time. By understanding how these electrical systems work and troubleshooting common issues, Audi owners can enjoy their vehicles for years to come.

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