Table of Contents
The Audi A3 (8P) debuted at the 2003 Geneva Motor Show. Initially available exclusively as a 3-door hatchback, a 5-door variant (Sportback) was introduced in July 2004, followed by a convertible (Cabriolet) in 2008. The model underwent facelifts in 2005, 2008, and 2010. This article details the fuse block diagrams for the second-generation Audi A3 (8P): 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, equipped with the following engines: 1.2 TSI, 1.4 TFSI, 1.6 8V, 1.6 FSI 16V, 1.6 8V E-Power, 1.6 TDI, 1.8 TFSI, 1.9 TDI 8V, 1.9 TDI 8V DPF, 2.0 FSI 16V, 2.0 TDI, 2.0 TDI 16V, 2.0 TFSI, 3.2 VR6, and RS3 (2.5 TFSI).
Also, this guide provides the locations and images of the power distribution centers (fuse blocks). The fuses allocated to the “Cigarette Lighter” and “Fuel Pump” circuits are indicated in bold.
Passenger Compartment
Interior Fuse Panel
Located on the driver's side, at the outer edge of the instrument panel, behind a plastic trim cover.
Panel removal and access.
General view of the interior fuse panel.
| Diagram | ||
|---|---|---|
|
||
| No. | Circuit Description | Amperage (A) |
| F1 | Data link connector (DLC), engine control module (ECM), headlamp leveling system, headlamp switch, trailer control module | 10 |
| F2 | Automatic transmission control module (TCM), direct-shift gearbox (DSG), anti-lock braking system (ABS), stop lamp switch (brake pedal position sensor), data link connector (DLC), engine control module (ECM), all-wheel drive (AWD) control module, electric power steering (EPS) | 10 |
| F3 | Supplemental Restraint System (SRS) / Airbags | 5 |
| F4 | Engine oil level/temperature sensor, HomeLink garage door opener, auto-dimming interior rearview mirror, navigation system, heated seats, HVAC control module, park assist control module, reverse lamps (manual transmission), TCS/ESP switch, passenger occupant detection system (PODS), tire pressure monitoring system (TPMS), heated windshield washer nozzles | 5 |
| F5 | Xenon headlamp control module (left) | 5 |
| F6 | Xenon headlamp control module (right) | 5 |
| F7 | Unused | — |
| F8 | Unused | — |
| F9 | Unused | — |
| F10 | Unused | — |
| F11 | Unused | — |
| F12 | Door control module (driver), door control module (passenger) | 10 |
| F13 | Door control module (rear left), door control module (rear right), multifunction control module 2 | 10 |
| F14 | Automatic transmission control module (TCM), direct-shift gearbox (DSG), anti-lock braking system (ABS) (if equipped), park assist control module | 10 |
| F15 | Interior lighting | 10 |
| F16 | Rain/light sensor, auxiliary heater remote receiver, HVAC diagnostic connector | 10 |
| F17 | Immobilizer / Anti-theft alarm system | 5 |
| F18 | Unused | — |
| F19 | Unused | — |
| F20 | Unused | — |
| F21 | Unused | — |
| F22 | HVAC blower motor | 40 |
| F23 | Driver's door power window motor | 30 |
| F24 | Audi A3 “Cigarette Lighter” | 20 |
| F25 | Rear window defogger | 30 |
| F26 | Auxiliary 12V power receptacle | 20 |
| F27 | Fuel pump control module (if equipped), fuel pump relay (if equipped), starter relay (fuel system) (if equipped) | 15 |
| F28 | Power window motors (rear left, rear right) | 30 |
| F29 | Unused | — |
| F30 | Automatic transmission control module (TCM) | 20 |
| F31 | Brake booster vacuum pump (if equipped) | 20 |
| F32 | Headlamp washer pump | 30 |
| F33 | Power sunroof module | 20 |
| F34 | Heated seat control module | 20 |
| F35 | Unused | — |
| F36 | Power seat adjustment | 10 |
| F37 | HVAC system, heated seats | 20 |
| F38 | Passenger's door power window motor | 30 |
| F39 | Unused | — |
| F40 | HVAC blower motor / system | 40 |
| F41 | Rear window wiper motor | 15 |
| F42 | Windshield/rear window washer pump | 15 |
| F43 | Multifunction control module 2 | 20 |
| F44 | Trailer control module | 20 |
| F45 | 15/20 | |
| F46 | Trailer wiring harness receptacle | 10 |
| F47 | Cellular telephone preparation | 5 |
| F48 | Driver instruction vehicle (dual controls) | 10 |
| F49 | Special-purpose vehicles, driver instruction vehicle | 5 |
Auxiliary Relay Panels
Mounted on the left side, beneath the instrument panel.
| Diagrams | |
|---|---|
| No. | Circuit Description |
| Relay Panel 1 (Type 1: 2007–2012). | |
|
|
| 1 | Headlamp washer pump relay |
| 2 | Coolant heater relay 1 (Diesel engines with auxiliary heater) |
| 3 | Coolant heater relay 2 (Diesel engines with auxiliary heater) |
| 4 | Starter motor relay |
| 5a | Fuel pump relay (Diesel engines) |
| 5b | “Fuel Pump” relay (Gasoline engines, BSE/BSF) |
| F1 | Unused |
| F2 | Unused |
| F3 | Power seat adjustment (30 A) |
| F4 | Unused |
| Relay Panel 1 (Type 2: 2005–2006). | |
|
|
| 1 | Headlamp washer pump relay |
| 2a | Through 07/2005: Starter relay (Fuel system) (Gasoline engines, BSE/BSF/BMJ/BUB) |
| 2b | “Fuel Pump” relay (Gasoline engines, BSE/BSF) |
| 3 | Through 07/2005: Starter motor relay |
| 4 | From 08/2005: Starter motor relay |
| 5a | From 08/2005: Starter relay (Fuel system) (Gasoline engines, BSE/BSF/BMJ/BUB) |
| 5b | From 08/2005: “Fuel Pump” relay (Gasoline engines, BSE/BSF) |
| F1 | Unused |
| F2 | Unused |
| F3 | Power seat adjustment (30 A) |
| F4 | Unused |
| Relay Panel 1 (Type 3: 2002–2005). | |
|
|
| 1 | Headlamp washer pump relay |
| 2a | Unused |
| 2b | “Fuel Pump” relay (AZV/BKC/BKD) |
| 3a | Unused |
| 3b | Unused |
| 4 | Driver instruction vehicle (dual controls) |
| 5 | Driver instruction vehicle (dual controls) |
| F1 | Power window motors, rear (5-door models) (30 A) |
| F2 | Power window motors, front (30 A) |
| Relay Panel 2 | |
|
|
| 1 | Multifunction control module relay 2 |
| 2 | Heated seat relay |
| 3 | Unused |
| 4 | Multifunction control module relay 1 |
| 5 | Rear window defogger relay |
| 6 | Horn relay |
| 7 | Windshield/rear window washer pump relay 2 |
| 8 | Windshield/rear window washer pump relay 1 |
| 9 | Terminal 15 (Ignition ON) auxiliary relay |
Engine Compartment
Located on the left side of the engine compartment, adjacent to the battery.
Underhood Fuse Block
Accessing the fuse block.
The primary underhood fuse block. There are four wiring diagram variations.
| Engine Compartment Fuse Assignments | ||
|---|---|---|
| Version 1 | ||
|
||
| Type 1 | ||
| No. | Circuit Description | Amperage (A) |
| F1 | Anti-lock braking system (ABS) module | 30 |
| F2 | 30 | |
| F3 | From 2007: Multifunction control module 2 | 20 |
| F4 | Multifunction control module 1 | 5 |
| F5 | Horn | 15 |
| F6 | Engine control module (ECM) | 15 |
| F7 | Unused | — |
| F8 | Unused | — |
| 9 | Engine control module (ECM) | 10 |
| 10 | 10 | |
| 11 | 10 | |
| 12 | 10 | |
| 13 | Transmission control module (TCM) (Automatic / Direct-shift gearbox [DSG]) | 15 |
| 14 | Unused | — |
| 15 | Coolant pump motor | 10 |
| 16 | Steering column control module (SCCM) | 5 |
| 17 | Instrument cluster control module | 5 |
| 18 | Audio system | 30 |
| 19 | Audio system, navigation system | 15/25 |
| 20 | Navigation system, telephone preparation | 5 |
| 21 | Unused | — |
| 22 | Unused | — |
| 23 | Engine control module (ECM) | 5/10 |
| 24 | Data link connector (DLC) | 5 |
| 25 | Unused | — |
| 26 | Unused | — |
| 27 | Exhaust flap control valve (BHZ) | 5 |
| 28 | Engine control module (ECM) | 25 |
| 29 | Coolant pump relay, secondary air injection (SAI) pump relay | 5 |
| 30 | Auxiliary heater | 20 |
| 31 | Windshield wiper motor | 30 |
| 32 | Unused | — |
| 33 | Unused | — |
| 34 | Unused | — |
| 35 | Unused | — |
| 36 | Unused | — |
| 37 | Unused | — |
| 38 | Radiator fan control module, engine control module (ECM) | 10 |
| 39 | Stop lamp switch (brake pedal position sensor), clutch pedal position sensor | 5 |
| 40 | Engine control module (ECM) | 20 |
| 41 | Unused | — |
| 42 | Engine control module (ECM) | 5 |
| 43 | Engine control module (ECM) | 30 |
| 44 | Unused | — |
| 45 | Unused | — |
| 46 | Unused | — |
| 47 | Multifunction control module 1 | 30/40 |
| 48 | 30/40 | |
| 49 | From 2007: Interior fuse/relay panel, multifunction control module relay 2 | 40 |
| 50 | Unused | — |
| 51 | Engine control module (ECM) | 40 |
| 52 | From 2007: Interior fuse/relay panel, auxiliary circuit relay, multifunction control module 1. | 40/50 |
| 53 | From 2007 : Power seat adjustment, interior fuse/relay panel | 50 |
| 54 | Unused | — |
| R1 | Terminal 15 (Ignition ON) main relay | |
| R2 | Coolant pump relay (AXX/BHZ/BMJ/BPY/BUB/BWA) | |
| R3 | Unused | |
| R4 | “Fuel Pump” relay (BMJ/BUB) | |
| Type 2 | ||
| 1 | Anti-lock braking system (ABS) module | 30 |
| 2 | 30 | |
| 3 | Multifunction control module 2 | 2 |
| 4 | Multifunction control module 1 - except 3.2 L (BDB) | 5 |
| 5 | Horn | 20 |
| 6 | Engine control module (ECM) - Gasoline | 5/20/30 |
| 7 | Stop lamp switch (brake pedal position sensor) | 5 |
| 8 | Radiator fan control module, engine control module (ECM) | 10 |
| 9 | Engine control module (ECM) | 10 |
| 10 | 10 | |
| 11 | Engine control module (ECM) - Gasoline | 25 |
| 12 | Engine control module (ECM) | 15 |
| 13 | Automatic transmission control module (TCM) | 20 |
| 14 | Unused | — |
| 15 | Starter motor | 40 |
| 16 | Steering column control module (SCCM) | 15 |
| 17 | Instrument cluster control module | 10 |
| 18 | Audio system | 30 |
| 19 | Audio system, navigation system | 15 |
| 20 | Telephone preparation | 5 |
| 21 | Navigation system | 10 |
| 22 | Unused | — |
| 23 | Unused | — |
| 24 | Data link connector (DLC), ignition switch | 10 |
| 25 | Unused | — |
| 26 | Engine control module (ECM) - Diesel | 5 |
| 27 | Positive crankcase ventilation (PCV) heater element | 10 |
| 28 | Automatic transmission control module (TCM) | 20 |
| 29 | Engine control module (ECM) | 10/20 |
| 30 | Auxiliary heater | 20 |
| 31 | Windshield wiper motor | 25 |
| 32 | Engine control module (ECM) | 10 |
| 33 | “Fuel Pump” | 15 |
| 34 | Unused | — |
| 35 | Unused | — |
| 36 | Unused | — |
| 37 | Unused | — |
| 38 | Headlamp leveling system | 10 |
| 39 | Engine oil temperature sensor, instrument cluster control module | 5 |
| 40 | Interior fuse/relay panel 1 | 30 |
| 41 | Unused | — |
| 42 | Engine control module (ECM) - Gasoline | 5 |
| 43 | Brake booster vacuum pump | 20 |
| 44 | Engine control module (ECM) - Diesel | |
| 45 | Engine control module (ECM) | 10/15 |
| 46 | 10 | |
| 47 | Multifunction control module 1 | 40 |
| 48 | 40 | |
| 49 | Multifunction control module relay 2 | 30 |
| 50 | Unused | — |
| 51 | Engine control module (ECM) - Gasoline | 40 |
| 52 | Multifunction control module 1 | 50 |
| 53 | Interior fuse/relay panel 1 (F32-F37) - Except 3.2 L (BDB) | 50 |
| 54 | Radiator fan control module | 50 |
| R1 | Terminal 15 (Ignition ON) main relay 2 | |
| R2 | Starter motor relay | |
| R3 | “Fuel Pump” relay - 1.6 L (BGU) / 3.2 L (BDB) | |
| R4 | Terminal 15 (Ignition ON) main relay 1 | |
| Type 3 | ||
| 1 | Anti-lock braking system (ABS) module | 30 |
| 2 | 30 | |
| 3 | Multifunction control module 2 | 20 |
| 4 | Multifunction control module 1 (Except BDB/BMJ) | 5 |
| 5 | Horn | 20 |
| 6 | Engine control module (ECM) | 15/20/30 |
| 7 | Stop lamp switch (brake pedal position sensor), clutch pedal position sensor | 5 |
| 8 | Radiator fan control module, engine control module (ECM) | 10 |
| 9 | Coolant pump motor (if equipped), engine control module (ECM) | 10 |
| 10 | Engine control module (ECM) | 10 |
| 11 | Engine control module (ECM) - Gasoline | 25 |
| 12 | Engine control module (ECM) | 15 |
| 13 | Transmission control module (TCM) (Automatic / Direct-shift gearbox [DSG]) | 20 |
| 14 | Unused | — |
| 15 | Starter motor | 40 |
| 16 | Steering column control module (SCCM) | 15 |
| 17 | Instrument cluster control module | 10 |
| 18 | Audio system | 30 |
| 19 | Audio system, navigation system | 15 |
| 20 | Telephone preparation | 5 |
| 21 | Navigation system | 10 |
| 22 | Unused | — |
| 23 | Unused | — |
| 24 | Data link connector (DLC) | 10 |
| 25 | Unused | — |
| 26 | Engine control module (ECM) | 5/10 |
| 27 | Positive crankcase ventilation (PCV) heater element | 5/10 |
| 28 | Automatic transmission control module (TCM) | 20 |
| 29 | Engine control module (ECM) | 10/20 |
| 30 | Auxiliary heater | 20 |
| 31 | Windshield wiper motor | 30 |
| 32 | Engine control module (ECM) | 10 |
| 33 | 15 | |
| 34 | Unused | — |
| 35 | Unused | — |
| 36 | Unused | — |
| 37 | Unused | — |
| 38 | Headlamp leveling system | 10 |
| 39 | Engine oil level/temperature sensor | 5 |
| 40 | Interior fuse/relay panel 1 (F1-F11/F29-F31) (Except BDB/BMJ) | 20/30 |
| 41 | Engine control module (ECM) | 10 |
| 42 | 5/10 | |
| 43 | Brake booster vacuum pump (if equipped) | 20 |
| 44 | Engine control module (ECM) | 10 |
| 45 | 10/15 | |
| 46 | 10 | |
| 47 | Multifunction control module 1 | 40 |
| 48 | 40 | |
| 49 | Interior fuse/relay panel 1 (F1-F11/F29-F31) - (BDB/BMJ), multifunction control module relay 2 | 30 |
| 50 | Unused | — |
| 51 | Engine control module (ECM) | 40 |
| 52 | Interior fuse/relay panel, auxiliary circuit relay, multifunction control module 1. | 50 |
| 53 | Interior fuse/relay panel 1 (F32-F37) - (BDB/BMJ) | 50 |
| 54 | Radiator fan control module | 50 |
| R1 | Terminal 15 (Ignition ON) main relay 2 | |
| R2 | Starter motor relay | |
| R3 | “Fuel Pump” relay (BDB/BGU/BMJ) | |
| R4 | Terminal 15 (Ignition ON) main relay 1 | |
| Version 2 | ||
|
||
|
||
| No. | Circuit Description | Amperage (A) |
| SB1 | From 2007: Multifunction control module 2 | 20 |
| SB2 | Steering column control module (SCCM) | 5 |
| SB3 | Multifunction control module 1 | 5 |
| SB4 | Anti-lock braking system (ABS) module | 30 |
| SB5 | Transmission control module (TCM) (Automatic / Direct-shift gearbox [DSG]) | 15 |
| SB6 | Instrument cluster control module | 5 |
| SB7 | Unused | |
| SB8 | Audio system, navigation system | 15/25 |
| SB9 | Navigation system, telephone preparation | 5 |
| SB10 | Engine control module (ECM) | 5/10 |
| SB11 | Auxiliary heater | 20 |
| SB12 | Data link connector (DLC) | 5 |
| SB13 | Engine control module (ECM) | 25/30 |
| SB14 | 20 | |
| SB15 | 5/10 | |
| SB16 | Anti-lock braking system (ABS) module | 30 |
| SB17 | Horn | 15 |
| SB18 | Audio system | 30 |
| SB19 | Windshield wiper motor | 30 |
| SB20 | Fuel pressure regulator solenoid valve (BPT/BPU/BYT) | 20 |
| SB21 | Engine control module (ECM) | 10/15 |
| SB22 | Stop lamp switch (brake pedal position sensor), clutch pedal position sensor | 5 |
| SB23 | Coolant pump relay, engine control module (ECM) | 5/10 |
| SB24 | Radiator fan control module (some models), engine control module (ECM) | 10 |
| SB25 | Multifunction control module 1 | 30/40 |
| SB26 | 30/40 | |
| SB27 | Secondary air injection (SAI) pump (BSE) | 40 |
| SB28 | From 2007 : Interior fuse/relay panel, multifunction control module relay 2 | 40 |
| SB29 | From 2007 : Power seat adjustment, interior fuse/relay panel | 50 |
| SB30 | From 2007 : Interior fuse/relay panel 1, auxiliary circuit relay, multifunction control module 1. | 40/50 |
| A1 | Terminal 15 (Ignition ON) main relay | |
| A2 | Secondary air injection (SAI) pump relay (BSE) | |
Auxiliary Relay Panel
Applicable only to vehicles equipped with Diesel engines.
|
|
| No. | Circuit Description |
| 1 | Unused |
| 2 | Glow plug control module |
| 3 | Unused |
| 4 | |
| 5 | Fresh air blower |
| 6 | Coolant pump relay |
High-Current Fuses (Fusible Links)
Located in the battery power distribution box.
|
||
| No. | Circuit Description | Amperage (A) |
| Type 1 | ||
| F1 | Alternator | 150/200 |
| F2 | Electric power steering (EPS) | 80 |
| F3 | Radiator fan control module | 80 |
| F4 | Interior fuse/relay panel 1, interior fuse/relay panel 2 - (BDB) | 80 |
| F5 | Auxiliary heater | 100 |
| F6 | Interior fuse/relay panel 1 (F12-F17 / F44-F45) - 3.2 L (BDB) | 50 |
| F7 | Unused | — |
| Type 2 | ||
| F1 | Alternator | 150/200 |
| F2 | Electric power steering (EPS) | 80 |
| F3 | Radiator fan control module | 50 |
| F4 | Through 10/2005: Interior fuse/relay panel | 80 |
| F5 | 11/2005–2007: Interior fuse/relay panel | 80 |
| F6 | Unused | — |
| F7 | Special-purpose vehicles | 50/80 |