1998 – 2001 Audi (A4 & S4) Fuse Box Diagrams & Location User Guide
This guide covers 1998–2001 Audi A4 and S4 fuse box schematics and locations. Discover how to easily identify fuse panels, understand fuse functions, and repair electrical issues to keep your Audi functioning smoothly and safely.
Instrument Panel Fuse Box
1998 to 2001 Audi (A4 & S4)
Fuse Box Location
Fuse Box Diagram
| No | Description |
|---|---|
| 1 | Heated washer jets |
| 2 | Turn signals |
| 3 | Headlight washer system relay, lighting (glove box) for: engine compartment, air conditioner, 4-speed automatic gearbox, dash panel insert |
| 4 | Number plate lights |
| 5 | Dash panel insert, seat heating, bulb monitoring, catalytic converter, diesel lights, gearshift display, switch illumination, mirror switch and mirror motors, airbag warning light, ambient temperature indicator, air conditioner, rear window blind, parking aid, navigation system, telephone/ telematics |
| 6 | Central locking |
| 7 | ABS, brake light switch, clutch pedal switch |
| 8 | Telephone/telematics |
| 9 | Heated mirrors |
| 10 | Automatic headlight range control |
| 11 | Cruise control system (automatic gearbox) |
| 12 | Voltage supply – diagnosis |
| 13 | Brake lights |
| 14 | Interior lights, reading lights, anti-theft alarm system, make-up mirrors, seat adjustment memory |
| 15 | Dash panel insert, air conditioner, memory (seat adjustment/mlrrors), navigation system |
| 16 | ABS, electronic stability program |
| 17 | Heated lock cylinders, navigation system, selflevelling suspension, two-way radio, two-way radio for special vehicles |
| 18 | Main beam headlight, right |
| 19 | Main beam headlight, left |
| 20 | Dipped beam headlight, right; headlight range control |
| 21 | Dipped beam headlight, left; headlight range control |
| 22 | Tail and side lights, right |
| 23 | Tail and side lights, left |
| 24 | Windscreen wiper system, washer pump, intermittent wiper relay |
| 25 | Fresh air blower, air conditioner |
| 26 | Heated rear window, mirror heating, air recirculation |
| 27 | Rear window wiper, heated steering wheel with electronics |
| 28 | Fuel pump/diesel auxiliary pump |
| 29 | Engine management |
| 30 | Sliding roof |
| 31 | Reversing lights, cruise control system, automatic gearbox, rpm boost (V6 2.8L, 128 kW, 2V quattro 5HR180), automatic anti-dazzle interior mirror, EGR valve, diagnosis connector |
| 32 | Engine management |
| 33 | Cigarette lighter |
| 34 | Engine management |
| 35 | Trailer socket |
| 36 | Front fog lights and rear fog light |
| 37 | Radio sound systems |
| 38 | Luggage compartment light, central locking |
| 39 | Hazard warning lights |
| 40 | Horn |
| 41 | ABS 5.0 – hydraulic unit (valves) |
| 42 | Electronic stability program |
| 43 | EGR valve, coolant temperature sensor |
| 44 | Seat heating (power circuit) |
Relay Panels
1998 to 2001 Audi (A4 & S4)
13-point relay carrier
| No | Description |
|---|---|
| 1 | – |
| 2 | Multi-function steering wheel control unit |
| 3 | Multi-function steering wheel control unit |
| 4 | Bulb monitoring control unit |
| 5 | Bulb monitoring control unit |
| 6 | Alarm system control unit (taxi) |
| 7 | Heated rear window relay |
| 8 | Daytime driving lights relay, alarm system control unit (taxi) |
| 9 | Headlight relay, alarm system control unit |
| 10 | Relay for glow plugs |
| 11 | Mirror control unit (with retraction function) |
| 12 | Mirror control unit (with retraction function) |
| 13 | Automatic gearbox relay |
| 14-17 | For police/taxi vehicles |
| 18 | – |
Micro-central electrics
| No | Description |
|---|---|
| 1 | Horn relay |
| 2 | Relief relay for X contact |
| 3 | – |
| 4 | Fuel pump relay, relay for glow plugs |
| 5 | Intermittent wash/wipe relay |
| 6 | Intermittent wash/wipe relay |
| A | – |
| B | – |
| C | – |
8-point relay carrier
| No | Description |
|---|---|
| 1 | Radiator fan relay (run-on) |
| 2 | Radiator fan relay (maximum speed) |
| 3 | Radiator fan relay (80W maximum speed), auxiliary water pump control unit |
| 4 | Relay for electronic stability program |
| 5 | Active door reflectors control unit |
| 6 | – |
| 7 | Relay for electronic stability program |
| 8 | – |
| 14 | Fuse for optional equipment |
| 15 | Seat adjustment fuse, front passenger’s side |
| 16 | Seat adjustment fuse, driver’s side |
| 17 | Repeller system fuse |
| 18 | ABS fuse |
| 19 | Radiator fan fuse |
| 20 | Radiator fan fuse |
| 21 | Radiator fan fuse (relay coil) |
| 22 | Rear window lifter fuse |
| 23 | Front window lifter fuse |
| 24 | Fuse for luggage compartment socket (Avant) |
3-point relay carrier
| No | Description |
|---|---|
| 1 | Relay 1 for heater elements (coolant) |
| 2 | Relay 2 for heater elements (coolant), secondary air pump relay |
| 3 | Diesel direct injection system relay, Motronic current supply relay |
| 4 | Auxiliary pump fuse |
| 5 | Fuse for engine electrics |
| 6 | – |
| 7 | Fuse 1 for glow plugs, secondary air pump fuse |
| 8 | Fuse 2 for glow plugs |
| 9 | Fuse for glow plugs – engine |