Audi A4 and S4 (B5) – fuse box diagram
Year of manufacture: 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001.
Fuse box in engine compartment
Fuse box diagram type 1
| 1 | Engine coolant heater relay 2, high power (Diesel) – if installed |
| 2 | Engine coolant heater relay 1, low power (Diesel) – if installed |
| 3 | Motor control relay (EC) |
| F1 | – |
| F2 | (15A) Engine Management (1998^) |
| F3 | (15A) Engine Management (^ 1997) |
| F4 | (50A) Engine Coolant Heater2 (1.9TDI) – if installed |
| F5 | (25A) Engine coolant heater (1.9 TDI)- if installed |
| F6 | (80A) Glow Plugs (1.9TDI) |
Type 2 – fuse box diagram
| 1 | Oxygen sensor system relay (2.6 ABC) |
| 2 | Engine heating element cooling 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 |
Audi A4 (B5) passenger compartment fuse box.
Fuse box location
The unit is located under the cover at the end of the instrument panel, on the left side. To open the cover, insert a screwdriver into the slot under the cover and lever the opening. Inside the fuse box cover is a crank to manually operate the electric sunroof. In the row to the right are two spare fuses.
Type 1
| F1 | (5A) Heated windscreen washer nozzles |
| F2 | (5A) Indicators, hazard warning lights |
| F3 | (5A) Clipboard lamp;
Dashboard Illumination; Headlight Washer Relay. |
| F4 | (5A) License plate lamp |
| F5 | (5A) Switch illumination;
Instrument panel illumination. |
| F6 | (5A) Central locking control unit |
| F7 | (10A) ABS control module |
| F8 | (5A) Telephone |
| F9 | – |
| F10 | – |
| F11 | (5A) Cruise control |
| F12 | (10A) Diagnostic socket |
| F13 | (10A) Stop lamps |
| F14 | (10A) Interior lamps;
Cosmetic Mirror Lamps. |
| F15 | (10A) Instrument panel, control modules |
| F 16 | (5A) ABS control unit |
| F17 | (10A) Door Lock Heater |
| F18 | (10A) Right traffic light |
| F19 | (10A) Traffic Light Left |
| F20 | (10A) Dipped headlights – right;
Headlight beam adjustment. |
| F21 | (10A) Passing lights – left;
Headlight adjustment. |
| F22 | (5A) Side lamps – right;
Rear lamps – right. |
| F23 | (5A) Side lamps – left;
Rear lamps – left. |
| F24 | (25A) Windshield wipers and washers |
| F25 | (30A) Heater fan motor;
Air conditioning components. |
| F26 | (30A) Heated rear window;
Heated mirrors. |
| F27 | (15A) Rear window wiper |
| F28 | (15A) Fuel pump |
| F29 | (20A) EVAP valve;
Lambda probe heater, in the intake manifold valve. |
| F30 | (20A) Opening roof |
| F31 | (15A) Reversing lights, control units |
| F32 | (20A) Ignition coils;
Mass airflow sensor; ECM. |
| F33 | (15A) Cigarette Lighter |
| F34 | (15A) Injectors |
| F35 | (30A) Trailer socket |
| F36 | (15A) Fog lights;
Rear fog lights. |
| F37 | (20A)Telephone transmitter/receiver module;
Audio unit. |
| F38 | (15A) Space Lamp for load;
Central locking. |
| F39 | (15A) Emergency Lights |
| F40 | (25A) Horn |
| F41 | (25A) Solenoid valve relay ABS |
| F42 | (30A) Auxiliary heater |
| F43 | – |
| F44 | (30A) Seat heating |
Type 2
| F1 | (5A) Heated windscreen washer nozzles |
| F2 | (10A) Indicators |
| F3 | (5A) Headlight washers;
Storage compartment light; Engine compartment light; Air conditioning (AC); Automatic transmission (AT); Dashboard. |
| F4 | (5A) Number plate lamps |
| F5 | (10A) Instrument panel;
Heated seats; Electric side mirrors; Shift lever attachment; SRS warning light; Outside air temperature indicator; Lamp failure warning module; Navigation system; Parking assistance; Air conditioning (AC); Catalytic converter; Rear glass curtains; Telephone/Telematics. |
| F6 | (5A) Central locking system |
| F7 | (10A) Anti-lock braking system (ABS);
BPP switch; CPP switch. |
| F8 | (5ATelephone/Telematics |
| F9 | (10A) Heated side mirrors;
Heated door locks; Gearshift lever attachment; 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) Interior lamps;
Reading lamps; Alarm system; Cosmetic light mirror; Electric seat memory. |
| F15 | (10A) Instrument panel;
Power windows; Automatic transmission (AT); Air conditioning (AC); Navigation system. |
| F 16 | (5A) Anti-lock braking system (ABS);
Electronic stability program (ESP). |
| F17 | (10A) Heated door locks;
Navigation system; Self-leveling suspension; Two-way radio. |
| F18 | (10A) Right Reflector – High Beam |
| F19 | (10A) Lamp front left – high beam |
| F20 | (10A/15A) Headlight Right – 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 windshield washer and wiper relay. |
| F25 | (30A) AC fan motor, heater;
Air conditioner (AC). |
| F26 | (30A) Heated rear window;
Heated side mirrors; Recirculating air conditioner and heater. |
| F27 | (15A) Rear wiper motor;
Heated steering wheel; Steering wheel switches. |
| F28 | (15A/20A) Fuel pump;
Fuel booster pump. |
| F29 | (20A) Engine Management |
| F30 | (20A) Opening roof |
| F31 | (15A) Reversing lights;
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 lights;
Rear fog lights. |
| F37 | (20A) Telephone, audio system |
| F38 | (15A) Trunk lid light, rear door, central locking system |
| F39 | (15A) Warning Lights |
| F40 | (25A) Horn |
| F41 | (25A) Anti-lock braking system (ABS) |
| F42 | (25A) Electronic Stability Program (ESP) |
| F43 | EGR solenoid valve;
Engine coolant temperature (ECT) sensor (1999^). |
| F44 | (30A) Heated seats |
Audi A4 B5 courier.
Type 1
| 1 | Ignition auxiliary circuit relay |
| 2 | Horn relay |
| 3 | Headlight Washer Pump Relay |
| 4 | Transmission system relay I – HV |
| 5 | Intermittent washer and wiper relay |
| 6 | Fuel pump relay |
| 7 | – |
| 8 | Daylight Continuous Relay |
| 9 | High beam relay |
| 10 | Light Fog Relay |
| 11 | External mirror control module |
| 13 | Relay II transmission system – HV |
| 14 | Rear washer and wiper |
| 15 | – |
| 16 | A/C Compressor Clutch Relay |
| 17 | Lamp failure warning module |
| 19 | – |
| F1 | – |
| F2 | (20A) Alarm system |
| F3 | (10A) Taximeter |
| F4 | (50A) ABS |
| F5 | (50A) ABS |
| 1 | Ignition auxiliary circuit relay |
| 2 | Relay horn-double sound |
| 3 | Headlight Washer Pump Relay |
| 4 | Bridge, from MT |
| 5 | Intermittent windshield washer and wiper relay |
| 6 | Fuel pump relay;
Glow plug. |
| 7 | Cab alarm system control module |
| 8 | Cab alarm system control module |
| 9 | High beam relay |
| 10 | Front fog light relay |
| 11 | Control module for side mirrors, with folding mirrors |
| 12 | Control module for side mirrors, with folding mirrors |
| 13 | Brake switch start switch;
Reverse light/s relay, with speed AT/4. |
| 14 | Rear windscreen washer pump relay |
| 16 | A/C Compressor Clutch Relay |
| 17 | Lamp failure warning module |
| 18 | Lamp Failure Warning Module |
| 19 | |
| F1 | |
| F2 | (20A) Alarm system (cab) |
| F3 | (10A)Taximeter |
| F4 | (5A) Two-way radio (cab) |
| F5 | (20A) Alarm system (cab) |
Type 3 (from 1998)
| 1 | Double sound relay horn |
| 2 | Ignition auxiliary circuit relay |
| 3 | |
| 4 | Fuel pump relay, glow plug relay |
| 5 | Intermittent windshield washer and wiper relay |
| 6 | Intermittent windshield washer and wiper relay |
| 7 | Front fog light relay (1998) |
| 8 | Cab alarm system control module 1, daytime running light relay |
| 9 | Cab alarm system control module 1, high beam relay |
| 10 | Alternator switch relay (AFB) -1998 |
| 11 | Control module for side mirrors, with folding mirrors |
| 12 | Control module for side mirrors, with folding mirrors |
| 13 | Brake switch start switch;
Reverse light/s relay, with speed AT/4. |
| 16 | Multi-function steering wheel control module |
| 17 | Lamp Failure Warning Module |
| 18 | Lamp Failure Warning Module |
| 19 | Cab alarm system control module 2 |
| F1 | |
| F2 | (20A) Alarm system (cab) |
| F3 | (10A)Taximeter |
| F4 | (5A) Two-way radio (cab) |
| F5 | (20A) Alarm system (cab) |
| F6 | |
| F7 | |
| F8 | (15A) Vacuum pump motor (AML/AMM/AMX/AVV) |
Audi A4 2.
Type 1
| 1 | Engine cooling fan timer relay |
| 2 | Condenser motor relay A/C I |
| 3 | Condenser motor relay A/C II |
| 4 | Electric window circuit relay |
| 5 | |
| 6 | |
| 7 | Telephone Relay |
| 8 | |
| 9 | |
| 10 | Light Fog Relay |
| 11 | |
| 12 | |
| 13 | |
| F1 | |
| F2 | (30A) Seat adjustment |
| F3 | |
| F4 | (50A) ABS Pump |
| F5 | (40A) A/C condenser motor I |
| F6 | (30A) Engine cooling fan motor fuse |
| F7 | (5A) Condenser motor A/C II |
| F8 | (30A) Electric windows |
| F9 | (30A) Electric windows |
| F10 | (15A) Central locking system |
| 1 | Engine cooling fan motor operating relay (if any) |
| 2 | Engine cooling fan motor relay – 2nd speed (if any) |
| 3 | Engine cooling fan motor relay – 1st speed |
| 4 | ABS relay (with ESP) |
| 5 | Control module for door open warning lights (1998^) |
| 6 | – |
| 7 | Switching relay for audio/telephone speaker unit (^ 1997) |
| 8 | – |
| F1 | – |
| F2 | (30A) Electric seat fuse, passenger side |
| F3 | (30A) Electric fuse for the seat, driver’s side |
| F4 | – |
| F5 | (10A) Auxiliary power socket |
| F6 | (30A) Electric Windshield Switch |
| F7 | (30A) Rear window switch |
| F8 | (5A) Cooling fan motor relay 1/2 |
| F9 | (40A) Engine cooling fan motor, 2-speed |
| F10 | (50A/60A) Anti-lock Braking System (ABS) |
| F11 | (30A) Engine cooling fan motor (one speed) |
