Audi A4 / S4 (B5/8D; 1998-2001) fuses and relays



In this article, we consider the first-generation Audi A4 / S4 (B5/8D), produced from 1994 to 2001. Here you will find fuse box diagrams of Audi A4 and S4 1998, 1999, 2000, and 2001, get information about the location of the fuse panels inside the car, and learn about the assignment of each fuse (fuse layout) and relay.

Fuse Layout Audi A4/S4 B5

Audi A4 / S4 (B5/8D; 1998-2001)

Instrument Panel Fuse Box

Fuse Box Location

The fuses are behind a cover on the driver’s side.Location of the fuses in the passenger compartment: Audi A4 / S4 (1998-2001)

Fuse Box Diagram

Instrument panel fuse box diagram: Audi A4 / S4 (1998, 1999, 2000, 2001)

Assignment of the fuses in the instrument panel
1Heated washer jets
2Turn signals
3Headlight washer system relay, lighting (glove box) for: engine compartment, air conditioner, 4-speed automatic gearbox, dash panel insert
4Number plate lights
5Dash 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
6Central locking
7ABS, brake light switch, clutch pedal switch
9Heated mirrors
10Automatic headlight range control
11Cruise control system (automatic gearbox)
12Voltage supply - diagnosis
13Brake lights
14Interior lights, reading lights, anti-theft alarm system, make-up mirrors, seat adjustment memory
15Dash panel insert, air conditioner, memory (seat adjustment/mlrrors), navigation system
16ABS, electronic stability program
17Heated lock cylinders, navigation system, selflevelling suspension, two-way radio, two-way radio for special vehicles
18Main beam headlight, right
19Main beam headlight, left
20Dipped beam headlight, right; headlight range control
21Dipped beam headlight, left; headlight range control
22Tail and side lights, right
23Tail and side lights, left
24Windscreen wiper system, washer pump, intermittent wiper relay
25Fresh air blower, air conditioner
26Heated rear window, mirror heating, air recirculation
27Rear window wiper, heated steering wheel with electronics
28Fuel pump/diesel auxiliary pump
29Engine management
30Sliding roof
31Reversing 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
32Engine management
33Cigarette lighter
34Engine management
35Trailer socket
36Front fog lights and rear fog light
37Radio sound systems
38Luggage compartment light, central locking
39Hazard warning lights
41ABS 5.0 - hydraulic unit (valves)
42Electronic stability program
43EGR valve, coolant temperature sensor
44Seat heating (power circuit)


Relay Panels

13-point relay carrier

13-point relay carrier: Audi A4 / S4 (1998, 1999, 2000, 2001)

2Multi-function steering wheel control unit
3Multi-function steering wheel control unit
4Bulb monitoring control unit
5Bulb monitoring control unit
6Alarm system control unit (taxi)
7Heated rear window relay
8Daytime driving lights relay, alarm system control unit (taxi)
9Headlight relay, alarm system control unit
10Relay for glow plugs
11Mirror control unit (with retraction function)
12Mirror control unit (with retraction function)
13Automatic gearbox relay
14-17For police/taxi vehicles
Micro-central electrics

Micro-central electrics: Audi A4 / S4 (1998, 1999, 2000, 2001)

1Horn relay
2Relief relay for X contact
4Fuel pump relay, relay for glow plugs
5Intermittent wash/wipe relay
6Intermittent wash/wipe relay
8-point relay carrier

8-point relay carrier: Audi A4 / S4 (1998, 1999, 2000, 2001)

1Radiator fan relay (run-on)
2Radiator fan relay (maximum speed)
3Radiator fan relay (80W maximum speed), auxiliary water pump control unit
4Relay for electronic stability program
5Active door reflectors control unit
7Relay for electronic stability program
14Fuse for optional equipment
15Seat adjustment fuse, front passenger’s side
16Seat adjustment fuse, driver’s side
17Repeller system fuse
18ABS fuse
19Radiator fan fuse
20Radiator fan fuse
21Radiator fan fuse (relay coil)
22Rear window lifter fuse
23Front window lifter fuse
24Fuse for luggage compartment socket (Avant)
3-point relay carrier

3-point relay carrier: Audi A4 / S4 (1998, 1999, 2000, 2001)

1Relay 1 for heater elements (coolant)
2Relay 2 for heater elements (coolant), secondary air pump relay
3Diesel direct injection system relay, Motronic current supply relay
4Auxiliary pump fuse
5Fuse for engine electrics
7Fuse 1 for glow plugs, secondary air pump fuse
8Fuse 2 for glow plugs
9Fuse for glow plugs - engine