In this article we look at the second-generation Audi A3 / S3 (8P) before a facelift, produced from 2003 to 2008. Here you will find the fuse box diagrams for the Audi A3 and S3 2004, 2005, 2006 and 2007, get information on the location of the fuse boxes in the car and learn about the assignment of each fuse (fuse layout).
Instrument Panel Fuse Box
Fuse Box Location
The fuses are behind a cover on the driver’s side. Carefully pry the fuse cover off the instrument panel using the ignition key or a screwdriver.
Fuse Box Diagram
Assignment of the fuses in the instrument panel
| № | Amps | Function/component |
|---|---|---|
| 1 | 10A | Light switch Fuel pump relay Engine control unit Motronic control unit Diesel direct injection system control unit Fuel pump control unit 16-pin connector (diagnostic connector) |
| 2 | 5A | ABS control unit Brake light switch Brake pedal switch |
| 3 | 10A | 2004-2005: Power steering control unit |
| 3 | 5A | 2006-2007: Airbag control unit Front passenger side airbag deactivated warning lamp |
| 4 | 5A | Tyre pressure monitor button TCS and ESP button Reversing light switch High pressure sender Air quality sensor Oil level and oil temperature sender Heater control unit Heated rear left seat control unit Heated rear right seat control unit Driver seat heating control unit Front passenger seat heating control unit |
| 5 | 5A/10A | 2004-2005: Airbag control unit Seat occupied recognition control unit Clutch position sender Brake light switch Brake pedal switch 2006-2007: Headlight range control, control unit Headlight range control regulator Left headlight range control motor Right headlight range control motor |
| 6 | 5A | Function selection switch 2 Selector lever Tiptronic switch Power steering control unit Data bus diagnostic interface Mechatronic unit for dual clutch gearbox Trailer detector control unit |
| 7 | 5A | 2004-2005: Heater control unit Headlight range control, control unit Heated rear left seat switch with regulator Heated rear right seat switch with regulator 2006-2007: Garage door operating unit Trailer detector control unit Navigation system with CD drive control unit Navigation operating electronics control unit Parking aid control unit Garage door operation control unit Automatic anti-dazzle interior mirror |
| 8 | 10A | 2004-2005: Garage door operating unit Navigation system with CD drive control unit Parking aid control unit Garage door operation control unit Automatic anti-dazzle interior mirror 2006-2007: Trailer socket |
| 9 | 5A | 2004-2005: Four-wheel drive control unit |
| 10 | 5A | 2004-2005: Selector lever Tiptronic switch 2006-2007: Seat occupied recognition control unit |
| 11 | 5A/10A | 2004-2005: Trailer socket 2006-2007: Power output module for right headlight |
| 12 | 10A | Driver door control unit Front passenger door control unit |
| 13 | 10A | Brake light switch (brake lights) 16-pin connector (diagnostic connector) |
| 14 | 5A | Automatic gearbox control unit |
| 15 | 10A | Onboard supply control unit |
| 16 | 10A | Rain and light detector sensor Heater control unit Climatronic control unit Remote control receiver for auxiliary heater |
| 17 | 5A | Convenience system central control unit -J393- |
| 18 | 5A | Selector lever Tiptronic switch Parking aid control unit ABS control unit (2004-2005) |
| 19 | 10A | Rear left door control unit Rear right door control unit |
| 20 | 5A | 2006-2007: ABS control unit |
| 21 | – | – |
| 22 | 40A | Fresh air blower control unit |
| 23 | 20A/30A | 2004-2005: Headlight washer system relay Headlight washer system pump 2006-2007: Driver side window regulator motor |
| 24 | 20A | Cigarette lighter 12V socket |
| 25 | 30A | Heated rear window |
| 26 | 20A | Electric socket |
| 27 | 15A | Electric fuel pump 2 relay Fuel pump control unit Fuel pump relay |
| 28 | 30A | 2006-2007: Rear left window regulator motor Rear right window regulator motor |
| 29 | 10A | 2004-2005: Motronic control unit Diesel direct injection system control unit Simos control unit Fuel pump control unit Front passenger side airbag deactivated warning lamp 2006-2007: Air mass meter Heater element for crankcase breather |
| 30 | 10A | 2006-2007: Injector, cylinder 1~6 |
| 31 | 5A | 2004-2005: Reversing light switch Mechatronic unit for dual clutch gearbox 2006-2007: Four-wheel drive control unit |
| 31 | 20A | 2006-2007: Vacuum pump relay |
| 32 | 30A | 2006-2007: Headlight washer system pump Headlight washer system relay |
| 33 | 25A | Sliding sunroof adjustment control unit |
| 34 | 20A | Heated rear left seat control unit Heated rear right seat control unit |
| 35 | 5A | Interior monitoring sensor Vehicle inclination sender Alarm horn |
| 36 | 10A | Driver seat lumbar support adjustment switch Front passenger seat lumbar support adjustment switch |
| 37 | 20A | Climatronic control unit Driver seat heating control unit Front passenger seat heating control unit Front left seat heating Front right seat heating |
| 38 | 30A | 2006-2007: Front passenger side window regulator motor |
| 39 | 20A | 2006-2007: Multifunction switch Automatic gearbox control unit |
| 40 | Fresh air blower switch (for models without air conditioning system only) | |
| 41 | 15A | Rear window wiper motor |
| 42 | 15A | Windscreen and rear window washer pump |
| 43 | – | – |
| 44 | 20A | Trailer detector control unit Supply for turn signal, brake light, left tail light (2004-2005) |
| 45 | 15A | Trailer detector control unit Supply for rear fog light, reversing light, right tail light (2004-2005) |
| 46 | 5A | Heater control unit Climatronic control unit Left washer jet heater element Right washer jet heater element |
| 47 | 5A | 2006-2007: Power output module for left headlight |
| 48 | 10A | Electric socket (for driving school only) |
| 49 | 5A | Special vehicle fuse 6 Footwell light switch Warning buzzer switch |
Fuses on left under dash panel
| № | Amps | Function/component |
|---|---|---|
| A | 30A | 2005: Window regulator single fuse 2 |
| B | 30A | 2004-2005: Window regulator single fuse |
| C | 30A | – |
| D | – | – |
Engine Compartment Fuse Box
Fuse Box Location
Push the two slides forward to unlatch the fuse cover.
Fuse Box Diagram
Version 1 (Low)
Assignment of the fuses in the engine compartment (low)
| № | Amps | Function/component |
|---|---|---|
| F1 | 20A | Convenience system central control unit |
| F2 | 5A | Steering column electronics control unit |
| F3 | 5A | Onboard supply control unit |
| F4 | 30A | ABS control unit ABS hydraulic unit |
| F5 | 15A | Mechatronic unit for dual clutch gearbox |
| F6 | 5A | Control unit in dash panel insert |
| F7 | – | – |
| F8 | 15A | Radio Navigation operating electronics control unit |
| F9 | 5A | Navigation system with CD drive control unit Navigation system tuner for TV Satellite radio Telephone transmitter and receiver unit Aerial amplifier for mobile telephone |
| F10 | 5A | Motronic control unit Motronic current supply relay Terminal 30 voltage supply relay |
| F11 | 20A | Auxiliary heater control unit |
| F12 | 5A | Data bus diagnostic interface |
| F13 | 30A | Engine control unit Diesel direct injection system control unit |
| F13 | 25A | Motronic control unit Engine control unit |
| F14 | 20A | Ignition coil 1 with output stage Ignition coil 2 with output stage Ignition coil 3 with output stage Ignition coil 4 with output stage |
| F15 | 15A | Lambda probe 1 heater after catalytic converter Lambda probe 2 heater after catalytic converter Lambda probe 3 heater after catalytic converter |
| F15 | 10A | Lambda probe 1 heater after catalytic converter |
| F15 | 5A | Automatic glow period control unit Fuel pump relay |
| F16 | 30A | ABS control unit ABS hydraulic pump |
| F17 | 15A | Treble tone horn Bass tone horn |
| F18 | 30A | Amplifier Amplifier with bass loudspeaker, on left in luggage compartment |
| F19 | 30A | Wiper motor control unit |
| F21 | 10A/15A | Lambda probe heater Lambda probe heater 2 Lambda probe 1 heater after catalytic converter |
| F22 | 5A | Brake pedal switch Clutch position sender |
| F23 | 15A | Fuel pressure regulating valve |
| F23 | 10A | Exhaust gas recirculation valve Charge pressure control solenoid valve Exhaust gas recirculation valve 2 Exhaust gas recirculation cooler change-over valve |
| F23 | 5A | Secondary air pump relay |
| F24 | 10A | Map-controlled engine cooling system thermostat Activated charcoal filter solenoid valve 1 Variable intake manifold change-over valve Camshaft control valve 1 Intake manifold flap motor |
| F25 | 40A | Onboard supply control unit (right side light, right main beam, right dipped beam, right turn signal, right fog light) |
| F26 | 40A | Onboard supply control unit (left side light, left main beam, left dipped beam, left turn signal, left fog light) |
| F27 | 50A | Automatic glow period control unit Glow plug 1~4 |
| F27 | 40A | Secondary air pump motor |
| F28 | 40A | Terminal 15 voltage supply relay 2 Supply for the fuses (instrument panel): SC1, SC2, SC3, SC4, SC5, SC6, SC7, SC8, SC9, SC10, SC11, SC29, SC30, SC31, SC39, SC47, SC49 |
| F29 | 50A | Supply for the fuses (instrument panel): SC18, SC20, SC32, SC33, SC34, SC35, SC36, SC37, SC44, SC45, SC48, and S131 |
| F30 | 40A/50A | X-contact relief relay Supply for the fuses (instrument panel): SC40, SC41, SC42, SC46 |
| SA1 | 150A/200A | Alternator |
| SA2 | 80A | Power steering control unit |
| SA3 | 50A | Radiator fan control unit Radiatorfan thermal switch Radiator fan |
| SA4 | 80A | Supply for the fuses (instrument panel): SC12, SC13, SC14, SC15, SC16, SC17, SC19, SC22, SC23, SC24, SC25, SC26, SC27, SC28, SC38 (is dropped from November 2005 |
| SA5 | 80A | Supply for the fuses (instrument panel): SC12, SC13, SC14, SC15, SC16, SC17, SC19, SC22, SC23, SC24, SC25, SC26, SC27, SC28, SC38 (applicable from November 2005) |
| SA5 | 100A | Auxiliary air heater control unit (up to November 2005) |
| SA6 | 100A | Auxiliary air heater control unit (applicable from November 2005) |
| SA7 | 50A/80A | Option for special vehicles |
Version 2 (High)
Assignment of the fuses in the engine compartment (high)
| No. | Nomina I value | Function/component |
|---|---|---|
| F1 | 30A | ABS control unit ABS hydraulic pump |
| F2 | 30A | ABS control unit ABS hydraulic unit |
| F3 | 20A | Convenience system central control unit |
| F4 | 5A | Onboard supply control unit |
| F5 | 15A | Treble tone horn Bass tone horn |
| F6 | 7.5A/15A | Fuel pressure regulating valve Fuel system pressurisation pump |
| F6 | 20A | 2004-2005: Output stage |
| F6 | 30A | 2004-2005: Ignition coil 1~6 with output stage |
| F7 | 5A | 2004-2005: Brake light switch Brake pedal switch Clutch travel sender |
| F8 | 10A | 2004-2005: Map-controlled engine cooling system thermostat Radiator fan control unit Exhaust gas recirculation valve Activated charcoal filter solenoid valve 1 Variable intake manifold change-over valve Camshaft control valve 1 Exhaust camshaft control valve 1 Intake manifold flap motor |
| F9 | 10A | 2004-2005: Fuel pump relay Continued coolant circulation relay Automatic glow period control unit NOx sensor control unit – Continued coolant circulation pump NOx sender heater 2006-2007: Charge pressure control solenoid valve Activated charcoal filter solenoid valve 1 Turbocharger air recirculation valve |
| F10 | 10A | 2004-2005: Secondary air pump relay Exhaust gas recirculation valve Charge pressure control solenoid valve Secondary air inlet valve Exhaust gas recirculation valve 2 Exhaust flap valve Lambda probe 1 heater after catalytic converter Lambda probe 2 heater after catalytic converter Fuel system diagnostic pump 2006-2007: Ar mass meter Fuel system diagnostic pump |
| F11 | 10A | 2006-2007: Lambda probe heater Lambda probe heater 2 |
| F11 | 25A | 2004-2005: Motronic control unit Simos control unit |
| F11 | 30A | 2004-2005: Diesel direct injection system control unit |
| F12 | 10A/15A | 2004-2005: NOx sensor control unit Lambda probe heater Lambda probe heater 2 NOx sender heater 2006-2007: Lambda probe 1 heater after catalytic converter Lambda probe 2 heater after catalytic converter |
| F13 | 15A/20A | Mechatronic unit for dual clutch gearbox |
| F14 | – | – |
| F15 | 10A | 2006-2007: Continued coolant circulation pump |
| F15 | 40A | 2004-2005: Starter |
| F16 | 5A | Steering column electronics control unit |
| F17 | 5A | Control unit in dash panel insert |
| F18 | 30A | Amplifier Amplifier with bass loudspeaker, on left in luggage compartment |
| F19 | 15A | Radio Navigation operating electronics control unit |
| F20 | 5A | Navigation system with CD drive control unit (2006-2007) Navigation system tuner for TV (2006-2007) Telephone transmitter and receiver unit Aerial amplifier for mobile telephone Satellite radio (2006-2007) |
| F21 | 10A | 2004-2005: Navigation system with CD drive control unit – Navigation system tuner for TV |
| F22 | – | – |
| F23 | 5A | 2006-2007: Motronic control unit Motronic current supply relay |
| F24 | 5A | Data bus diagnostic interface |
| F25 | – | – |
| F26 | 10A | 2004-2005: Motronic control unit Motronic current supply relay |
| F26 | 5A | 2004-2005: Terminal 30 voltage supply relay |
| F27 | 5A/10A | 2004-2005: Heater element for crankcase breather (for models with heater element only) |
| F28 | 20A | 2004-2005: Automatic gearbox control unit |
| F28 | 25A | 2006-2007: Motronic control unit |
| F29 | 10A/20A | 2004-2005: Injector, cylinder 1~4 / Injector, cylinder 1~6 |
| F29 | 5A | 2006-2007: Continued coolant circulation relay Secondary air pump relay |
| F30 | 20A | Auxiliary heater control unit |
| F31 | 30A | Wiper motor control unit |
| F32 | 10A | 2004-2005: Injector, cylinder 1~4 Charge pressure control solenoid valve Activated charcoal filter solenoid valve 1 Turbocharger air recirculation valve |
| F33 | 15A | 2004-2005: Fuel system pressurisation pump |
| F33 | 7.5A/15A | 2004-2005: Fuel pressure regulating valve |
| F34 | – | – |
| F35 | – | – |
| F36 | – | – |
| F37 | – | – |
| F38 | 10A | 2004-2005: Left headlight range control motor Right headlight range control motor 2006-2007: Activated charcoal filter solenoid valve 1 Variable intake manifold change-over valve Camshaft control valve 1 Exhaust camshaft control valve 1 Radiator fan control unit |
| F39 | 5A | 2004-2005: Oil level and oil temperature sender 2006-2007: Brake pedal switch Clutch position sender |
| F40 | 20A | 2004-2005: Supply for the fuses (instrument panel): SC1, SC2, SC3, SC4, SC5, SC6, SC7, SC8, SC9, SC10, SC11, SC29, SC31 (for models with battery in engine compartment only) 2006-2007: Ignition coil 1~4 with output stage |
| F41 | 10A | 2004-2005: Air mass meter |
| F42 | 5A/10A | 2004-2005: Fuel pump relay Air mass meter |
| F42 | 5A | 2006-2007: Engine component current supply relay |
| F43 | 20A | 2004-2005: Vacuum pump relay (for petrol engines with automatic gearbox only) |
| F43 | 30A | 2006-2007: Ignition coil 1~6 with output stage |
| F44 | 10A | 2004-2005: Air mass meter Fuel system diagnostic pump |
| F45 | 10A/15A | 2004-2005: Lambda probe heater Lambda probe 1 heater after catalytic converter |
| F46 | 10A | 2004-2005: Lambda probe heater 2 Lambda probe 1 heater after catalytic converter Lambda probe 2 heater after catalytic converter |
| F47 | 40A | Onboard supply control unit Left side light supply, left main beam, left dipped beam, left turn signal, left fog light |
| F48 | 40A | Onboard supply control unit Right side light supply, right main beam, right dipped beam, right turn signal, right fog light |
| F49 | 40A | Terminal 15 voltage supply relay 2 Supply for the fuses (instrument panel): SC1, SC2, SC3, SC4, SC5, SC6, SC7, SC8, SC9, SC10, SC11, SC29, SC30, SC31, SC47, SC49 |
| F50 | – | – |
| F51 | 40A | Secondary air pump relay Secondary air pump motor |
| F51 | 50A | Automatic glow period control unit |
| F52 | 40A/50A | X-contact relief relay Supply for the fuses (instrument panel): SC40, SC41, SC42, SC46 |
| F53 | 50A | 2004-2005: Supply for the fuses (instrument panel): SC32, SC33, SC34, SC35, SC36, SC37, SC44, SC45 (for models with battery in engine compartment only) Supply for the fuses (instrument panel): SC32, SC33, SC34, SC35, SC36, SC37 (for models with battery in luggage compartment only) 2006-2007: Supply for the fuses (instrument panel): SC18, SC20, SC32, SC33, SC34, SC35, SC36, SC37, SC44, SC45, SC48, and S131 |
| F54 | 50A | 2004-2005: Radiator fan thermal switch Radiator fan control unit |
| SA1 | 150A/200A | Alternator |
| SA2 | 80A | Power steering control unit |
| SA3 | 80A | Radiator fan control unit |
| SA4 | 80A | Window regulator single fuse Supply for the fuses: SC22, SC23, SC24, SC25, SC26, SC27 (for models with battery in luggage compartment only) |
| SA5 | 100A | Auxiliary air heater control unit |
| SA6 | 50A | Supply for the fuses: SC12, SC13, SC14, SC15, SC16, SC17, SC44, SC45 (for models with battery in luggage compartment only) |
| SA6 | 80A | Window regulator single fuse Supply for the fuses: SC12, SC13, SC14, SC15, SC16, SC17, SC22, SC23, SC24, SC25, SC26, SC27 (for models with battery in engine compartment only) |
| SA7 | 50A/80A | Option for special vehicles |
Main Fuse Box
It is in luggage compartment (rear right).
| № | Amps | Function/component |
|---|---|---|
| 1 | 5A | Onboard supply control unit |
| 2 | 125A | Supply for main fuse box, electronics box high, relay and fuse carrier, electronics box high |
| 3 | 80A | Supply for main fuse box, electronics box high, relay and fuse carrier, electronics box high |
| 4 | 30A | 2005-2007: Amplifier for models with Bose sound system only 2005-2007: Supply for the fuses in the instrument panel: #12, 13, 14, 15, 16, 17, 19 2006-2007: Supply for the fuses in the instrument panel: #12, 13, 14, 15, 16, 17, 47 |
