Audi A4 2003 - 2002-03 ELECTRICAL Fuses & Circuit Breakers - A4, A4 Quattro, A4 Avant Quattro
Audi A4 2003 - IDENTIFICATION ENGINE CODE
Engines are identified by a 3-letter code stamped on the engine. For engine code locations, see Fig. 1 and Fig. 2 . Engine codes are also located on the vehicle data plate.
Fig. 1: Audi A4 2003 - Component Locations - Locating Engine Code (1.8L Turbo - AMB)
Fig. 2: Audi A4 2003 - Component Locations - Locating Engine Code (3.0L - AVK)
Audi A4 2003 - FUSES CONNECTOR STATION
NOTE: Manufacturer does not provide specific information for fuse number, position number, amperage rating and circuits protected in left side connector station.
Connector stations are located on right and left sides of footwell below A-pillar trim. See . For fuse position in connector stations, see Fig. 3-Fig. 6 . For fuse number, position number, amperage rating and circuits protected in right side connector station, see FUSE IDENTIFICATION (CONNECTOR STATION - RIGHT) table.
Fig. 3: Audi A4 2003 - Component Locations - Locating Connector Station (Left)
Fig. 4: Audi A4 2003 - Component Locations - Locating Connector Station (Right)
Fig. 5: Audi A4 2003 - Component Locations - Identifying Connector Station Fuses (Left)
Fig. 6: Audi A4 2003 - Component Locations - Identifying Connector Station Fuses (Right)
Audi A4 2003 FUSE IDENTIFICATION (CONNECTOR STATION - RIGHT)
Position No. Fuse No. Amp Rating Circuit Protected C N/A N/A Not Used D N/A N/A Not Used E S46 30 (1) Power Seat F N/A N/A Not Used
(1) On vehicles equipped with power lumbar, manually adjusted seats, fuse amperage is 10 amps.
Audi A4 2003 - FUSE COLOR IDENTIFICATION
Audi A4 2003 FUSE COLOR/AMP RATING
Fuse Color Amp Rating Blue 15 Brown 7.5 Green 30 Light Brown 5 Red 10 Transparent (White) 25 Yellow 20
Audi A4 2003 - FUSE PANEL LOCATION
Fuse panel is located behind left side of dashboard. See Fig. 7.
Fig. 7: Audi A4 2003 - Component Locations - Locating Fuse Panel
Audi A4 2003 - FUSE PANEL IDENTIFICATION
For fuse position within panel, see Fig. 8. For fuse number, amperage rating and circuits protected, see FUSE IDENTIFICATION (FUSE PANEL) table.
Fig. 8: Audi A4 2003 - Component Locations - Identifying Fuse Panel Fuse Locations
NOTE: Fuses 23 through 44 may be designated in wiring diagrams with a prefix of 2. For example, fuse No. 29 may be labeled as 229. Fuse No. 43 may be labeled as 243.
Audi A4 2003 FUSE IDENTIFICATION (FUSE PANEL)
Fuse No. Amp Rating Circuits Protected 1 10 A/C Control Head 2 5 Footwell Lights 3 5 Washer Nozzle Heaters 4 5 Coolant Fan Control Module 5 10 Oil Level Thermal Sensor, Telephone Operating Electronic Control Module, Tiptronic Switch, Rear Heated Seats, Navigation W/CD Control Module, Board Computer Function Selector Switch II, Rear Window Shade, Telephone/Telematic Control Module 6 5 Air Quality Sensor, High Pressure Sensor 7 10 Brake Light Switch, Clutch Vacuum Vent valve Switch, Anti-Slip Control Switch, ABS Control Module 8 5 Telephone Operating Electronics Control Module, Telephone Amplifier, Telephone/Telematic Control Module 9 15 Brake Booster Relay 10 10 Headlight Range Control Module 11 N/A Not Used 12 10 DLC 13 10 Steering Column Electronic System Control Module, Navigation W/CD Control Module 14 10 Brake Light Switch 15 10 Control Module W/Indicator Unit 16 5 Garage Door Opener Control Head, Garage Door Opener Control Module 17 N/A Not Used 18 N/A Not Used 19 N/A Not Used 20 15 Vehicle Electrical System Control Module, High Intensity Gas Discharge Lamp Control Module. 21 15 Vehicle Electrical System Control Module, High Intensity Gas Discharge Lamp Control Module. 22 15 Door Control Module (Driver's & Passenger's) 23 15 Window Regulator Motor (Rear Driver's & Passenger's Side) 24 20 Comfort System Control Module 25 30 Fresh Air Blower Control Module 26 30 A/C Control Head 27 N/A Not Used 28 20 Fuel Pump 29 20 ECM, Ignition Coils 30 20 Sunroof Motor 31 15 DLC, Back-Up Light switch, Vehicle Electrical System Control Module, Automatic Day/Night Interior Mirror, DLC, Shift Lock Solenoid, Multi-Function Transmission Range Switch, Park/Neutral Position Relay, Transmission Control Module 32 20 Fuel Injectors 33 15 Cigarette Lighter 34 Engine Code AMB 15 MAF Sensor, Secondary Air Injection Solenoid Valve, EVAP Canister Purge Valve Regulator Valve No. 1, Turbo Charger Recirculating Valve, Leak Detection Pump Engine Code AVK 15 MAF Sensor, Secondary Air Injection Solenoid Valve, EVAP Canister Purge Valve Regulator Valve No. 1, Leak Detection Pump, Intake Manifold Change Over Valve, Secondary Air Injection Pump Relay, Oxygen Sensor Heaters 35 30 Socket 36 30 Vehicle Electrical Control System, Rear Windshield Motor 37 25 Vehicle Electrical Control System 38 15 Alarm Horn, Comfort System Control Module, Radar Interior Monitoring Control Module 39 20 Radio, Amplifier 40 25 Horn Relay 41 N/A Not Used 42 25 ABS Control Module 43 15 ECM 44 30 A/C Control Head, Rear Heated Seat Control Module (Left & Right)
Audi A4 2003 - MAIN FUSE
Main fuse is locating on battery. See Fig. 9. Main fuse is numbered "S88" and has an amperage rating of 150 amps.
Fig. 9: Audi A4 2003 - Component Locations - Locating Main Fuse
Audi A4 2003 - RELAYS FOUR-PIN RELAY CARRIER (E-BOX)
For fuse and relay positions within carrier, see Fig. 10. For relay number, position number and circuits protected, see RELAY IDENTIFICATION (FOUR-PIN RELAY CARRIER, E-BOX) table. For fuse number, position number, amperage rating and circuits protected, see FUSE IDENTIFICATION (FOUR-PIN RELAY CARRIER, E-BOX) table.
NOTE: Four-pin relay carrier is located in electronics box, plenum chamber, in the left rear corner of engine compartment.
Fig. 10: Audi A4 2003 - Component Locations - Identifying Four-Pin Relay Carrier (E-Box)
Audi A4 2003 RELAY IDENTIFICATION (FOUR-PIN RELAY CARRIER, E-BOX)
Position Relay No. Circuit Protected 1.1 (1) J151 Coolant Circulation Pump 1.2 N/A Not Used 2 J299 Secondary Air Injection Pump Relay 3 J271 ECM Power Supply 4 Manual Transmission J434 Starter Locking Automatic Transmission (Tiptronic) J60 Starter Interlock Alarm System Automatic Transmission (Multitronic) J226 Park/Neutral Position
(1) Applies to vehicles equipped with engine code AVK only.
Audi A4 2003 FUSE IDENTIFICATION (FOUR-PIN RELAY CARRIER, E-BOX)
Position No. Fuse No. Amp Rating Circuit Protected A S282 15 Engine Electronics B S130 40 Secondary Air Pump C (1) S286 15 Automatic Transmission (After-Run)
(1) Applies to vehicles equipped with automatic transmission (multitronic) only.
Audi A4 2003 - FOUR-PIN RELAY CARRIER (INSTRUMENT PANEL)
For fuse and relay positions within carrier, see Fig. 11. For relay number, position number and circuits protected, see RELAY IDENTIFICATION (FOUR-PIN RELAY CARRIER, INSTRUMENT PANEL) table. For fuse number, position number, amperage rating and circuits protected, see FUSE IDENTIFICATION (FOUR-PIN RELAY CARRIER, INSTRUMENT PANEL) table.
NOTE: Four-Pin relay carrier is located behind instrument panel.
Fig. 11: Audi A4 2003 - Component Locations - Identifying Four-Pin Relay Carrier (Instrument Panel)
Audi A4 2003 RELAY IDENTIFICATION (FOUR-PIN RELAY CARRIER, INSTRUMENT PANEL)
Position No. Relay No. Circuit Protected 1 N/A Not Used 2 N/A Not Used 3 N/A Not Used 4 N/A Not Used
Audi A4 2003 FUSE IDENTIFICATION (FOUR-PIN RELAY CARRIER, INSTRUMENT PANEL)
Position No. Fuse No. Amp Rating Circuit Protected A N/A N/A Not Used B N/A N/A Not Used C N/A N/A Not Used D N/A N/A Not Used E N/A N/A Not Used F N/A N/A Not Used G S42 40 Coolant Fan H S123 50 Fuse 1 For Control Module
Audi A4 2003 - NINE-PIN RELAY CARRIER
For fuse and relay position within carrier, see Fig. 12. For relay number, position number and circuits protected, see RELAY IDENTIFICATION (NINE-PIN RELAY CARRIER) table. For fuse number, position number, amperage rating and circuits protected, see FUSE IDENTIFICATION (NINE-PIN RELAY CARRIER) table.
NOTE: Nine-Pin relay carrier is located under driver's side of instrument panel, behind storage compartment.
Fig. 12: Audi A4 2003 - Component Locations - Identifying Nine-Pin Relay Carrier
Audi A4 2003 RELAY IDENTIFICATION (NINE-PIN RELAY CARRIER)
Position No. Relay No. Circuit Protected 1 J17 Fuel Pump 2 J236 Servotronic Control Module 3 J4 Horn Relay 4 J569 Brake Booster 5 N/A Not Used 6 J59 Load Reduction 7 N/A Not Used 8 N/A Not Used 9 N/A Not Used
Audi A4 2003 FUSE IDENTIFICATION (NINE-PIN RELAY CARRIER)
Position No. Fuse No. Amp Rating Circuit Protected A S100 10 Rear Shade Circuit Breaker B N/A N/A Not Used C N/A N/A Not Used D S280 30 Power Windows 2 E S45 10 Power Seats F S37 30 Power Widows G N/A N/A Not Used