Wiring Diagram AUDI A3 2002 - Battery - starter - alternator - main fuse box/battery
| A | Battery |
| B | Starter |
| C | Alternator |
| C1 | Voltage regulator |
| D | Ignition/starter switch |
| S131 | Fuse 1 |
| S132 | Fuse 2 |
| S133 | Fuse 3 |
| S134 | Fuse 4 |
| S138 | Fuse 5 |
| S162 | 1 in fuse box/battery |
| S163 | 2 in fuse box/battery |
| S164 | 3 in fuse box/battery |
| T2f | 2-pin connector, wiring duct, in engine compartment, left |
| T3e | 3-pin connector, black, on main fuse box/battery |
| T6m | 6-pin connector, brown, in plenum chamber |
| 2 | Earth strap, gearbox - body |
| 10 | Earth point, in plenum chamber |
| 12 | Earth point, in engine compartment, left |
| 85 | Earth connection -1-, in engine compartment wiring harness |
| 281 | Earth connection -1-, in engine prewiring wiring harness |
| * | Only engine codes ARZ, APP, APY |
| ** | Does not apply to engine code APY |
| *** | Only to engine code APY |
Wiring Diagram AUDI A3 2002 - Motronic control unit - fuel pump relay - injectors - Hall sender - Hall sender - charge pressure control solenoid valve - divert air valve
| D | Ignition/starter switch |
| E3 | Hazard warning light switch |
| F88 | Power assisted steering pressure switch |
| G40 | Hall sender |
| J17 | Fuel pump relay |
| J220 | Motronic control unit |
| N30 | Injector, cylinder 1 |
| N31 | Injector, cylinder 2 |
| N32 | Injector, cylinder 3 |
| N33 | Injector, cylinder 4 |
| N75 | Charge pressure control solenoid valve |
| N249 | Turbocharger divert air valve |
| T6m | 6-pin connector, brown, in plenum chamber |
| T14 | 14-pin connector, in engine compartment, left |
| A86 | Connection (50a), in dash panel wiring harness |
| A100 | Connection -2- (87), in dash panel wiring harness |
| A125 | Connection (crash signal), in dash panel wiring harness |
| B155 | Connection -2- (DC), in interior wiring harness |
| D140 | Connection (injectors), in engine prewiring wiring harness |
| D141 | Connection (5V), in engine prewiring wiring harness |
| E7 | Positive (+) connection (87a), in Motronic wiring harness |
| * | Only to engine code APY |
Wiring Diagram AUDI A3 2002 - Motronic control unit - knock sensors - engine speed sender - coolant temperature senders
| G2 | Coolant temperature sender |
| G28 | Engine speed sender |
| G61 | Knock sensor 1 |
| G62 | Coolant temperature sender |
| G66 | Knock sensor 2 |
| J217 | Automatic gearbox control unit |
| J220 | Motronic control unit |
| T3b | 3-pin connector, black, in engine compartment |
| T3c | 3-pin connector, brown, in engine compartment |
| T3d | 3-pin connector, grey, in engine compartment |
| T10x | 10-pin connector, orange, in plenum chamber |
| T14 | 14-pin connector, in engine compartment, left |
| 220 | Earth connection (sender earth), in engine wiring harness |
| 278 | Earth connection -4-, in interior wiring harness |
| A45 | Connection (engine speed signal), in dash panel wiring harness |
| A108 | Connection (speed signal), in dash panel wiring harness |
| D101 | Connection -1-, in engine compartment wiring harness |
| * | Does not apply four speed automatic gearbox |
| ** | Only models with five speed automatic gearbox |
Wiring Diagram AUDI A3 2002 - Radiator fan
| G31 | Charge air pressure sender |
| G42 | Intake air temperature sender |
| G186 | Throttle valve drive |
| G187 | Throttle valve drive angle sender -1- |
| G188 | Throttle valve drive angle sender -2- |
| J104 | ABS with EDL control unit |
| J217 | Automatic gearbox control unit |
| J220 | Motronic control unit |
| J299 | Secondary air pump relay |
| J338 | Throttle valve control unit |
| T10 | 10-pin connector, white, in plenum chamber |
| V101 | Secondary air pump motor |
| 10 | Earth point, in plenum chamber |
| 220 | Earth connection (sender earth), in engine wiring harness |
| A121 | Connection (high bus), in dash panel wiring harness |
| A122 | Connection (low bus), in dash panel wiring harness |
| E14 | Connection -1-, in Motronic wiring harness |
| * | Only engine codes ARZ, APP, APY |
| ** | Only models with automatic gearbox |
| *** | Relay in plenum chamber |
| CAN bus (data wires) |
Wiring Diagram AUDI A3 2002 - Dash panel insert - combi-processor in dash panel insert - fuel pump - fuel gauge sender - road speed sender - fuse box
| E45 | Cruise control system switch |
| F | Brake light switch |
| F36 | Clutch pedal switch |
| G79 | Accelerator pedal position sender |
| G185 | Accelerator pedal position sender -2- |
| J220 | Motronic control unit |
| T7 | 7-pin connector, behind steering column switch trim |
| T10e | 10-pin connector, black, in plenum chamber |
| T10g | 10-pin connector, blue, in plenum chamber |
| 85 | Earth connection -1-, in engine compartment wiring harness |
| B135 | Connection -1- (15a), in interior wiring harness |
| B185 | Connection -2- (54), in interior wiring harness |
| * | Only models with cruise control system |
| ** | Only models with manual gearbox |
| *** | Only to engine code APY |
Wiring Diagram AUDI A3 2002 - Simos control unit - lambda probes with additional heater - air mass meter - activated charcoal filter system solenoid valve
| E87 | Control and display unit for air conditioner |
| G39 | Lambda probe |
| G70 | Air mass meter |
| G130 | Lambda probe downstream of catalytic converter |
| J217 | Automatic gearbox control unit |
| J220 | Motronic control unit |
| J293 | Radiator fan control unit |
| N80 | Activated charcoal filter system solenoid valve 1 |
| N112 | Secondary air inlet valve |
| T4 | 4-pin connector, in engine compartment, right |
| T4m | 4-pin connector, in engine compartment, right |
| T6m | 6-pin connector, brown, in plenum chamber |
| T10x | 10-pin connector, orange, in plenum chamber |
| Z19 | Lambda probe heater |
| Z29 | Lambda probe 1 heater, downstream of catalytic converter |
| 19 | Earth point, near coil |
| 283 | Earth connection -2-, in engine prewiring wiring harness |
| D80 | Positive (+) connection (87a), in engine compartment wiring harness |
| * | Only models with air conditioner |
| ** | Does not apply to engine code APY |
| *** | Only models with automatic gearbox |
| **** | Only engine codes ARZ, APP, APY |
Wiring Diagram AUDI A3 2002 - Motronic control unit - ignition system
| J220 | Motronic control unit |
| N | Ignition coil 1 |
| N128 | Ignition coil 2 |
| N158 | Ignition coil 3 |
| N163 | Ignition coil 4 |
| P | Spark plug connector |
| Q | Spark plugs |
| T10 | 10-pin connector, white, in plenum chamber |
| 281 | Earth connection -1-, in engine prewiring wiring harness |
| 283 | Earth connection -2-, in engine prewiring wiring harness |
| D106 | Connection -4-, in engine compartment wiring harness |
Wiring Diagram AUDI A3 2002 - Motronic control unit - current supply relay
| J220 | Motronic control unit |
| J271 | Motronic current supply relay |
| S7 | Fuse in fuse box |
| S10 | Fuse in fuse box |
| S13 | Fuse in fuse box |
| S229 | Fuse in fuse box |
| T2m | 2-pin connector, wiring duct, in engine compartment, left |
| T6m | 6-pin connector, brown, in plenum chamber |
| T14 | 14-pin connector, in engine compartment, left |
| A2 | Positive (+) connection (15), in dash panel wiring harness |
| A15 | Positive (+) connection (15), in dash panel wiring harness |
| A98 | Positive (+) connection -4- (30a), in dash panel wiring harness |
| B156 | Positive (+) connection -4- (30a), in interior wiring harness |
| D78 | Positive (+) connection -1- (30a), in engine compartment wiring harness |
| * | Relay in plenum chamber |
Wiring Diagram AUDI A3 2002 - Radiator fan
| F18 | Radiator fan thermo-switch |
| F54 | Radiator fan thermo-switch |
| J155 | Coolant pump control unit |
| V7 | Radiator fan |
| V51 | Continued circulation of coolant pump |
| 11 | Earth point, in battery box |
| 12 | Earth point, in engine compartment, left |
| 188 | Earth connection -3-, in air conditioner wiring harness |
| A68 | Connection (30, air conditioner), in dash panel wiring harness |
| * | Applies to engine code APY only, models not equipped with air conditioner |
| ** | Does not apply to engine code APY |
Wiring Diagram AUDI A3 2002 - Dash panel insert - combi-processor in dash panel insert - fuel pump - fuel gauge sender - road speed sender - fuse box
| G | Fuel gauge sender |
| G6 | Fuel pump |
| G22 | Speedometer sender, (Hall sender, on gearbox) |
| J218 | Combi-processor in dash panel insert |
| K132 | Electronic power control fault lamp |
| K149 | Engine electronics warning lamp |
| S228 | Fuse in fuse box |
| S232 | Fuse in fuse box |
| S234 | Fuse in fuse box |
| S243 | Fuse in fuse box |
| T14 | 14-pin connector, in engine compartment, left |
| 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 |
| 278 | Earth connection -4-, in interior wiring harness |
| 281 | Earth connection -1-, in engine prewiring wiring harness |
| A99 | Connection -1- (87), in dash panel wiring harness |
| A101 | Connection -3- (87), in dash panel wiring harness |
| B147 | Positive (+) connection -2- (87), in interior wiring harness |
| B149 | Positive (+) connection -2- (15a), in interior wiring harness |
| B178 | Connection (speed signal), in interior wiring harness |
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