Wiring Diagram AUDI A3 2003 - Voltage supply
| D | Ignition/starter switch |
| E1 | Lighting switch |
| E87 | Control and display unit for air conditioner/Climatronic |
| S3 | Fuse in fuse box/relay plate |
| S5 | Fuse in fuse box/relay plate |
| S16 | Fuse in fuse box/relay plate |
| S225 | Fuse in fuse box |
| S226 | Fuse in fuse box |
| A2 | Positive (+) connection (15), in dash panel wiring harness |
| A3 | Positive (+) connection (58), in dash panel wiring harness |
| A98 | Positive (+) connection -4- (30), in dash panel wiring harness |
| B135 | Connection -1- (15a), in interior wiring harness |
| B156 | Positive (+) connection (30a), in interior wiring harness |
| L59 | Positive (+) connection (30), in heater unit wiring harness |
Wiring Diagram AUDI A3 2003 - Ambient temperature sensor - sunlight penetration photo sensor - fresh air blower control unit
| E87 | Control and display unit for air conditioner/Climatronic |
| G17 | Ambient temperature sensor |
| G107 | Sunlight penetration photo sensor |
| J126 | Fresh air blower control unit |
| V2 | Fresh air blower |
| 30 | Earth point -1-, next to relay plate |
| 112 | Earth connection -2-, in air conditioner wiring harness |
| 249 | Earth connection -2-, in interior wiring harness |
| 277 | Earth connection -3-, in interior wiring harness |
| L2 | Connection, in air conditioner wiring harness |
| L59 | Positive (+) connection (30), in heater unit wiring harness |
Wiring Diagram AUDI A3 2003 - Two-way valve for coolant cut-off valve - glove box light - heated rear window
| E15 | Heated rear window switch |
| E87 | Control and display unit for air conditioner/Climatronic |
| N147 | Two-way valve for coolant cut-off valve |
| T6a | 6-pin connector, black, in luggage compartment, left |
| T10a | 10-pin connector, green, in plenum chamber |
| W6 | Glove box light |
| Z1 | Heated rear window |
| 10 | Earth point, in plenum chamber |
| 50 | Earth point, luggage compartment, left |
| 85 | Earth connection -1-, in engine compartment wiring harness |
| 98 | Earth connection, in tailgate wiring harness |
| 277 | Earth connection -3-, in interior wiring harness |
| A82 | Connection (windscreen heater), in dash panel wiring harness |
| B117 | Connection (58a, right), in interior wiring harness |
| * | Only applies to models with engine code AVU, as of model year 2003 no longer fitted |
Wiring Diagram AUDI A3 2003 - Combi-processor in dash panel insert
| E87 | Control and display unit for air conditioner/Climatronic |
| J218 | Combi-processor in dash panel insert |
| T16 | 16-pin connector, black, centre console compartment (diagnostic connector) |
| T32 | 32-pin connector, blue, on dash panel insert |
| T32a | 32-pin connector, green, on dash panel insert |
| 277 | Earth connection -3-, in interior wiring harness |
| A27 | Connection (speed signal), in dash panel wiring harness |
| A45 | Connection (engine speed signal), in dash panel wiring harness |
| A76 | Connection (diagnosis wire K), in dash panel wiring harness |
| B116 | Connection (58d), in interior wiring harness |
| B145 | Positive (+) connection (58b), in interior wiring harness |
| B211 | Connection -1- (Climatronic, rear), in interior wiring harness |
Wiring Diagram AUDI A3 2003 - Temperature flap control motor - footwell/defroster flap control motor
| E87 | Control and display unit for air conditioner/Climatronic |
| G92 | Control motor potentiometer, temperature flap |
| G114 | Control motor potentiometer, footwell/defroster flap |
| G191 | Vent temperature sender, centre |
| V68 | Temperature flap control motor |
| V85 | Footwell/defroster flap control motor |
| 97 | Earth connection -1-, in air conditioner wiring harness |
| L31 | Connection (5V), in air conditioner wiring harness |
| * | Only applies to air conditioner with map-controlled engine cooling |
Wiring Diagram AUDI A3 2003 - Central flap control motor - air flow flap control motor
| E87 | Control and display unit for air conditioner/Climatronic |
| G89 | Fresh air intake duct temperature sensor |
| G112 | Control motor potentiometer, central flap |
| G113 | Control motor potentiometer, air flow flap |
| G192 | Vent temperature sender, footwell |
| V70 | Central flap control motor |
| V71 | Air flow flap control motor |
| 97 | Earth connection -1-, in air conditioner wiring harness |
| L31 | Connection (5V), in air conditioner wiring harness |
Wiring Diagram AUDI A3 2003 - Radiator fan control unit - Motronic control unit - diesel direct injection system control unit - Simos control unit
| E87 | Control and display unit for air conditioner/Climatronic |
| J220 | Motronic control unit |
| J248 | Diesel direct injection system control unit |
| J293 | Radiator fan control unit |
| J361 | Simos control unit |
| T10 | 10-pin connector, white, in plenum chamber |
| T10a | 10-pin connector, green, in plenum chamber |
| T10x | 10-pin connector, orange, in plenum chamber |
| T14a | 14-pin connector, air conditioner control unit (radiator fan) |
| * | Only applies to models with engine codes ATD, ASZ, AXR, ALH, ASV |
| ** | Only applies to models with engine codes APG, ARX, AUM, AUQ, ARY, AMK, BAM |
| *** | Only applies to models with engine codes AVU, BFQ |
| **** | Only applies to models with engine code BAH |
| ***** | Does not apply to models with engine codes AVU, BFQ |
Wiring Diagram AUDI A3 2003 - High pressure sender - continued coolant circulation pump
| G65 | High pressure sender |
| J220 | Motronic control unit |
| J248 | Diesel direct injection system control unit |
| J293 | Radiator fan control unit |
| J361 | Simos control unit |
| T10x | 10-pin connector, orange, in plenum chamber |
| T14 | 14-pin connector, in engine compartment, left |
| T14a | 14-pin connector, air conditioner control unit (radiator fan) |
| V51 | Continued coolant circulation pump |
| 11 | Earth point, in battery box |
| 188 | Earth connection -3-, in air conditioner wiring harness |
| B209 | Connection (Climatronic sender), in interior wiring harness |
| * | Only applies to models with engine codes AVU, BFQ |
| ** | Only applies to models with engine code APG |
| *** | Only applies to models with engine code BAH |
| **** | Only applies to models with engine codes AMK, BAM |
Wiring Diagram AUDI A3 2003 - Battery - radiator fan thermo-switches
| A | Battery |
| F18 | Radiator fan thermo-switch |
| F54 | Radiator fan thermo-switch |
| J293 | Radiator fan control unit |
| S133 | Fuse 3 |
| S164 | Fuse -3- (30), in fuse box/battery |
| T3e | 3-pin connector, black, on main fuse box |
| T4p | 4-pin connector, on radiator fan control unit |
| 11 | Earth point, in battery box |
| A68 | Connection (30, air conditioner), in dash panel wiring harness |
| L26 | Connection (radiator fan), in engine compartment - Climatronic wiring harness |
| * | Only applies to models with engine codes AVU, BFQ |
| ** | Does not apply to models with engine codes AVU, BFQ |
Wiring Diagram AUDI A3 2003 - Radiator fan - radiator fan - right - air conditioning system magnetic coupling
| J293 | Radiator fan control unit |
| N25 | Air conditioning system magnetic coupling |
| T2g | 2-pin connector, near compressor |
| T4b | 4-pin connector, in engine compartment, left |
| T4p | 4-pin connector, on radiator fan control unit |
| T14a | 14-pin connector, on radiator fan control unit |
| V7 | Radiator fan |
| V35 | Radiator fan, right |
| 188 | Earth connection -3-, in air conditioner wiring harness |
| L26 | Connection (radiator fan), in engine compartment - Climatronic wiring harness |
| L43 | Connection (radiator fan), in air conditioner/radiator fan wiring harness |
| * | Only applies to models with engine codes AVU, BFQ |
| ** | Does not apply to models with engine codes AVU, BFQ |
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