Audi A4 and S4 (B5) (1994-2001) – fuse box
Audi A4 and S4 (B5) – fuse box diagram
Year of production: 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001.
Fuse box in the engine compartment
Type 1 – fuse box diagram
| 1 | Engine coolant heater relay 2, high power (diesel) – if fitted |
| 2 | Engine coolant heater relay 1, low horsepower (diesel) – if fitted |
| 3 | Engine control relay (EC) |
| F1 | – |
| F2 | (15A) Engine Management (1998 ^) |
| F3 | (15A) Engine Management (^ 1997) |
| F4 | (50A) Engine2 coolant heater (1.9TDI) – if fitted |
| F5 | (25A) Engine coolant heater (1.9 TDI) – if fitted |
| F6 | (80A) Glow plugs (1.9TDI) |
Type 2 – fuse box diagram
| 1 | Oxygen sensor system relay (2.6 ABC) |
| 2 | Engine coolant heater element relay II |
| 3 | Diesel injection system relay |
| F1 | – |
| F2 | – |
| F3 | (20A) Injection system |
| F4 | (50A) Engine coolant heating element |
| F5 | (25A) Engine coolant heating element |
| F6 | (15A) Glow plug system |
Fuse box in the passenger compartment of the Audi A4 (B5).
Location of the fuse box
The device is located under a cover at the end of the dashboard on the left side. To open the cover, insert a screwdriver into the slot under the cover and pry it open. A crank for manual activation of the electric sunroof is located on the inside of the fuse box cover. There are two spare fuses in the row on the right.
Type 1
| F1 | (5A) Heated washer nozzles |
| F2 | (5A) Indicators, hazard lights |
| F3 | (5A) Glove box lamp;
Instrument panel lighting; Headlight washer relay. |
| F4 | (5A) License plate lamp |
| F5 | (5A) Switch lighting;
Instrument panel lighting. |
| F6 | (5A) Central locking control module |
| F7 | (10A) ABS control module |
| F8 | (5A) Telephone |
| F9 | – |
| F10 | – |
| F11 | (5A) Cruise control |
| F12 | (10A) Diagnostic socket |
| F13 | (10A) Stop lamps |
| F14 | (10A) Indoor lamps;
Cosmetic mirror lamps. |
| F15 | (10A) Instrument panel, control modules |
| F 16 | (5A) ABS control unit |
| F17 | (10A) Door lock heating |
| F18 | (10A) Right-hand traffic light |
| F19 | (10A) Left main beam |
| F20 | (10A) Dipped headlamps – right;
Headlamp beam adjustment. |
| F21 | (10A) Left dipped beam;
Headlamp adjustment. |
| F22 | (5A) Side lamps – right;
Rear lamps – right. |
| F23 | (5A) Side lamps – left;
Rear lamps – left. |
| F24 | (25A) Windscreen wipers and washers |
| F25 | (30A) Heater blower motor;
Air conditioning components. |
| F26 | (30A) Heated rear window;
Heated mirrors. |
| F27 | (15A) Rear window wiper |
| F28 | (15A) Fuel pump |
| F29 | (20A) EVAP valve;
Heating of the lambda probe, in the intake manifold valve. |
| F30 | (20A) Sunroof |
| F31 | (15A) Reversing lamps, control modules |
| F32 | (20A) Ignition coils;
Mass air flow sensor; ECM. |
| F33 | (15A) Cigarette lighter |
| F34 | (15A) Injectors |
| F35 | (30A) Trailer socket |
| F36 | (15A) Fog lamps;
Rear fog lights. |
| F37 | (20A) Telephone transmitter / receiver module;
Audio unit. |
| F38 | (15A) Cargo area lamp;
Central lock. |
| F39 | (15A) Hazard warning lights |
| F40 | (25A) Horn |
| F41 | (25A) ABS solenoid valve relay |
| F42 | (30A) Auxiliary heater |
| F43 | – |
| F44 | (30A) Seat heating |
Type 2
| F1 | (5A) Heated windshield washer nozzles |
| F2 | (10A) Indicators |
| F3 | (5A) Headlamp washers;
Glove box light; Engine compartment light; Air conditioning (AC); Automatic transmission (AT); Instrument panel. |
| F4 | (5A) License plate lamps |
| F5 | (10A) Instrument panel;
Heated seats; Electric door mirrors; Gear lever display; SRS warning light; Outside air temperature indicator; Bulb failure warning module; Navigation system; Parking aid; Air conditioning (AC); Catalyst; Rear window blind; Telephone / telematics. |
| F6 | (5A) Central locking |
| F7 | (10A) Anti-lock brake system (ABS);
BPP switch; CPP switch. |
| F8 | (5A Telephone / Telematics |
| F9 | (10A) Heated door mirrors;
Heated door locks; Gear lever display; Outside air temperature indicator. |
| F10 | (5A) Automatic headlight adjustment |
| F11 | (5A) Cruise control (with AT) |
| F12 | (10A) Data link connector (DLC) |
| F13 | (10A) Stop lamps |
| F14 | (10A) Indoor lamps;
Reading lights; Alarm system; Cosmetic mirror lamp; Electric chair memory. |
| F15 | (10A) Instrument panel;
Electric windows; Automatic transmission (AT); Air conditioning (AC); Navigation system. |
| F 16 | (5A) Anti-lock brake system (ABS);
Electronic Stability Program (ESP). |
| F17 | (10A) Heated door locks;
Navigation system; Self-leveling suspension; Two-way radio. |
| F18 | (10A) Right headlight – high beam |
| F19 | (10A) Left head lamp – high beam |
| F20 | (10A / 15A) Right headlight – low beam, headlight adjustment |
| F21 | (10A / 15A) Left headlight – low beam, headlight adjustment |
| F22 | (5A) Side lamps, rear right |
| F23 | (5A) Side lamps, rear left |
| F24 | (25A) Windshield washer and wiper system;
Intermittent washer and windshield wipe relay. |
| F25 | (30A) AC blower motor, heater;
Air conditioning (AC). |
| F26 | (30A) Heated rear window;
Heated door mirrors; Air conditioning and heater recirculation. |
| F27 | (15A) Rear window wiper motor;
Heated steering wheel; Switches on the steering wheel. |
| F28 | (15A / 20A) Fuel pump;
Fuel lifting pump. |
| F29 | (20A) Engine management |
| F30 | (20A) Sunroof |
| F31 | (15A) Reversing lamps;
Cruise control; Automatic transmission (AT); Data Link Connector (DLC); Anti-glare interior mirror; EGR solenoid valve. |
| F32 | (20A) Engine management |
| F33 | (15A) Cigarette lighter |
| F34 | (15A) Engine management |
| F35 | (30A) Trailer socket |
| F36 | (15A) Front fog lamps;
Rear fog lights. |
| F37 | (20A) Telephone, audio system |
| F38 | (15A) Trunk lid lamp, tailgate lamp, central locking |
| F39 | (15A) Warning lamps |
| F40 | (25A) Horn |
| F41 | (25A) Anti-lock brake system (ABS) |
| F42 | (25A) Electronic Stability Program (ESP) |
| F43 | EGR solenoid valve;
Engine Coolant Temperature (ECT) sensor (1999 ^). |
| F44 | (30A) Heated seats |
Relay Audi A4 B5.
Type 1
| 1 | Ignition auxiliary circuits relay |
| 2 | Horn relay |
| 3 | Headlight washer pump relay |
| 4 | I – AT transmission system relay |
| 5 | Intermittent relay for washer and windscreen wipers |
| 6 | Fuel pump relay |
| 7 | – |
| 8 | Daytime running lights relay |
| 9 | High beam headlamp relay |
| 10 | Fog lamp relay |
| 11 | Exterior mirror control module |
| 13 | Gearbox system relay II – AT |
| 14 | Rear washer and wiper relay |
| 15 | – |
| 16 | A/C compressor clutch relay |
| 17 | Bulb failure warning module |
| 19 | – |
| F1 | – |
| F2 | (20A) Alarm system |
| F3 | (10A) Taximeter |
| F4 | (50A) ABS |
| F5 | (50A) ABS |
| 1 | Ignition auxiliary circuits relay |
| 2 | Horn relay – double sound |
| 3 | Headlight washer pump relay |
| 4 | Most, from MT |
| 5 | Intermittent washer and windshield wipe relay |
| 6 | Fuel pump relay;
Glow plug relay. |
| 7 | Taxi alarm system control module |
| 8 | Taxi alarm system control module |
| 9 | High beam headlamp relay |
| 10 | Front fog lamp relay |
| 11 | Side mirror control module, with folding mirrors |
| 12 | Side mirror control module, with folding mirrors |
| 13 | Starter brake switch relay;
Reverse lamp / sec relay, with AT / 4 speed. |
| 14 | Rear window washer pump relay |
| 16 | A / C compressor clutch relay |
| 17 | Bulb failure warning module |
| 18 | Bulb failure warning module |
| 19 | |
| F1 | |
| F2 | (20A) Alarm system (taxi) |
| F3 | (10A) Taximeter |
| F4 | (5A) Two-way radio (taxi) |
| F5 | (20A) Alarm system (taxi) |
Type 3 (from 1998)
| 1 | Horn relay – double sound |
| 2 | Ignition auxiliary circuits relay |
| 3 | |
| 4 | Fuel pump relay, glow plug relay |
| 5 | Intermittent washer and windshield wipe relay |
| 6 | Intermittent washer and windshield wipe relay |
| 7 | Front Fog Lamp Relay (1998) |
| 8 | Taxi alarm system control module 1, daytime running lamp relay |
| 9 | Taxi alarm system control module 1, high beam relay |
| 10 | Alternator enable relay (AFB) -1998 |
| 11 | Side mirror control module, with folding mirrors |
| 12 | Side mirror control module, with folding mirrors |
| 13 | Starter brake switch relay;
Reverse lamp / sec relay, with AT / 4 speed. |
| 16 | Multifunction steering wheel control module |
| 17 | Bulb failure warning module |
| 18 | Bulb failure warning module |
| 19 | Taxi alarm system control module 2 |
| F1 | |
| F2 | (20A) Alarm system (taxi) |
| F3 | (10A) Taximeter |
| F4 | (5A) Two-way radio (taxi) |
| F5 | (20A) Alarm system (taxi) |
| F6 | |
| F7 | |
| F8 | (15A) Vacuum pump motor (AML / AMM / AMX / AVV) |
Relay box No.2 Audi A4.
Type 1
| 1 | Engine coolant blower timer |
| 2 | A / C condenser blower motor relay I |
| 3 | A / C condenser blower motor relay II |
| 4 | Window electric circuit relay |
| 5 | |
| 6 | |
| 7 | Telephone relay |
| 8 | |
| 9 | |
| 10 | Fog lamp relay |
| 11 | |
| 12 | |
| 13 | |
| F1 | |
| F2 | (30A) Seat adjustment |
| F3 | |
| F4 | (50A) ABS pump |
| F5 | (40A) A / C condenser blower motor I |
| F6 | (30A) Engine coolant blower motor fuse |
| F7 | (5A) A / C condenser blower motor II |
| F8 | (30A) Electric windows |
| F9 | (30A) Electric windows |
| F10 | (15A) Central locking |
| 1 | Engine coolant blower motor run relay (if equipped) |
| 2 | Engine Coolant Blower Motor Relay – 2nd Speed (If Equipped) |
| 3 | Engine coolant blower motor relay – 1st speed |
| 4 | ABS relay (with ESP) |
| 5 | Door open warning lamp control module (1998 ^) |
| 6 | – |
| 7 | Audio unit / telephone loudspeaker switching relay (^ 1997) |
| 8 | – |
| F1 | – |
| F2 | (30A) Seat electric fuse, passenger side |
| F3 | (30A) Seat fuse, driver’s side |
| F4 | – |
| F5 | (10A) Auxiliary power socket |
| F6 | (30A) Windshield electric switch |
| F7 | (30A) Rear window electric switch |
| F8 | (5A) Coolant blower motor relay 1/2 |
| F9 | (40A) Engine coolant blower motor, 2 speed |
| F10 | (50A / 60A) Anti-lock brake system (ABS) |
| F11 | (30A) Engine coolant blower motor (one speed) |
