Wiring Diagram SEAT LEON 2002 - Battery - starter - alternator - voltage regulator - ignition/starter switch - X contact relief relay
| A | Battery |
| B | Starter |
| C | Alternator |
| C1 | Voltage regulator |
| D | Ignition/starter switch |
| J59 | X contact relief relay |
| S10 | Fuse in relay plate fuse box |
| S11 | Fuse in relay plate fuse box |
| S163 | Fuse -2- (30), in battery fuse box |
| S176 | Fuse -4- (30), in battery fuse box |
| S177 | Fuse -5- (30), in battery fuse box |
| S229 | Fuse in fuse box |
| T2k | 2-pin connector, on engine |
| T4l | 4-pin connector, on engine |
| T6l | 6-pin connector, brown, in protective housing for connectors, in plenum chamber, left |
| A2 | Positive (+) connection (15), in dash panel wiring harness |
| A32 | Positive (+) connection (30), in dash panel wiring harness |
| A41 | Positive (+) connection (50), in dash panel wiring harness |
| A98 | Positive (+) connection -4- (30), in dash panel wiring harness |
| 500 | Screw connection -1- (30), on relay plate |
| 501 | Screw connection -2- (30), on relay plate |
| 502 | Screw connection -1- (30a), on relay plate |
Wiring Diagram SEAT LEON 2002 - Motronic control unit - coolant temperature sender - hall sender - ignition transformer - spark plug connector - spark plug
| G2 | Coolant temperature sender |
| G40 | Hall sender |
| G62 | Coolant temperature sender |
| J220 | Motronic control unit |
| N152 | Ignition transformer |
| P | Spark plug connector |
| Q | Spark plug |
| T4r | 4-pin connector |
| T6l | 6-pin connector, brown, in protective housing for connectors, in plenum chamber, left |
| T14a | 14-pin connector, in cable channel left |
| T80 | 80-pin connector |
| 85 | Earth connection -1-, in engine compartment wiring harness |
| 220 | Earth connection (sender earth), in engine wiring harness |
| A98 | Positive (+) connection -4- (30), in dash panel wiring harness |
| A104 | Positive (+) connection -2- (15), in dash panel wiring harness |
Wiring Diagram SEAT LEON 2002 - Motronic control unit - engine speed sender - intake air temperature sender
| G28 | Engine speed sender |
| G42 | Intake air temperature sender |
| G71 | Intake manifold pressure sender |
| J220 | Motronic control unit |
| J255 | Climatronic control unit |
| J293 | Radiator fan control unit |
| N121 | Exhaust gas recirculation frequency valve |
| T3d | 3-pin connector, near intake manifold |
| T10 | 10-pin connector, orange, in protective housing for connectors, in plenum chamber, left |
| T14 | 14-pin connector |
| T16b | 16-pin connector |
| T80 | 80-pin connector |
| 220 | Earth connection (sender earth), in engine wiring harness |
| D101 | Connection -1-, in engine compartment wiring harness |
Wiring Diagram SEAT LEON 2002 - Motronic control unit - throttle valve control unit - knock sensor I - throttle valve drive (electric throttle operation)
| G61 | Knock sensor I |
| G186 | Throttle valve drive (electric throttle operation) |
| G187 | Throttle valve drive angle sender -1- (electric throttle operation) |
| G188 | Throttle valve drive angle sender -2- (electric throttle operation) |
| J104 | ABS with EDL control unit |
| J220 | Motronic control unit |
| J338 | Throttle valve control unit |
| T2r | 2-pin connector, on cylinder head, left |
| T6n | 6-pin connector |
| T10d | 10-pin connector, green, in protective housing for connectors, in plenum chamber, left |
| T25 | 25-pin connector |
| T47 | 47-pin connector |
| T80 | 80-pin connector |
| D101 | Connection -1-, in engine compartment wiring harness |
| D102 | Connection -2-, in engine compartment wiring harness |
Wiring Diagram SEAT LEON 2002 - Motronic control unit - accelerator pedal position sender - accelerator pedal position sender -2- - injector cylinder 1 - injector cylinder 2 - injector cylinder 3
| G79 | Accelerator pedal position sender |
| G185 | Accelerator pedal position sender -2- |
| J220 | Motronic control unit |
| N30 | Injector, cylinder 1 |
| N31 | Injector, cylinder 2 |
| N32 | Injector, cylinder 3 |
| N33 | Injector, cylinder 4 |
| S232 | Fuse in fuse box |
| T6m | 6-pin connector, on accelerator pedal |
| T10d | 10-pin connector, green, in protective housing for connectors, in plenum chamber, left |
| T10h | 10-pin connector, blue, in protective housing for connectors, in plenum chamber, left |
| T14a | 14-pin connector, in cable channel left |
| T80 | 80-pin connector |
| D95 | Connection (injectors), in engine compartment wiring harness |
Wiring Diagram SEAT LEON 2002 - Motronic control unit - Lambda probe - Lambda probe heating
| F | Brake light switch |
| G39 | Lambda probe |
| J220 | Motronic control unit |
| Z19 | Lambda probe heating |
| T6q | 6-way connector, exhaust pipe |
| T10d | 10-way connector, green, in the connector's protective casing, plenum chamber, left |
| T10d | 10-way connector, black, in the connector's protective casing, plenum chamber, left |
| T80 | 80-way connector |
| 10 | Earthing point, plenum chamber |
| 131 | Earth connection -2-, engine bay wiring harness |
| * | Only vehicles with GRA |
Wiring Diagram SEAT LEON 2002 - Motronic control unit - Lambda probe - Lambda probe heating
| G130 | Lambda probe after catalytic converter |
| J17 | Fuel pump relay |
| J220 | Motronic control unit |
| J234 | Airbag control unit |
| N80 | Activated charcoal filter system solenoid valve I (pulsed) |
| Z29 | Heater for Lambda probe 1, after catalytic converter |
| T4p | 4 way connector, engine bay, centre |
| T61 | 6-way connector, brown, in the connector's protective casing, plenum chamber, left |
| T10 | 10-way connector, orange, in the connector's protective casing, plenum chamber, left |
| T75 | 75-way connector, behind central console |
| T80 | 80-way connector |
| A27 | Connection (speed signal), instrument panel wiring harness |
| A125 | Connection (impact signal), instrument panel wiring harness |
| E30 | Connexion (87a), engine wiring harness |
| * | Only vehicles with M.F.A. |
| ** | W auto-diagnosis line |
Wiring Diagram SEAT LEON 2002 - Motronic control unit - Lambda probe after catalytic converter - Lambda probe 1 heater - after the catalytic converter - fuel pump relay
| G | Fuel gauge sender (00771-3113) |
| G6 | Fuel pump (pre-supply pump) |
| G32 | Coolant shortage indicator sender |
| S228 | Fuse in fuse box |
| S234 | Fuse in fuse box |
| S243 | Fuse in fuse box |
| T6l | 6-pin connector, brown, on connector protective housing, on plenum chamber, left side |
| T14a | 14-pin connector, in wiring channel, left side |
| 81 | Earth connection -1-, in dash panel wiring harness |
| 269 | Earth connection (sender earth) -1-, in dash panel wiring harness |
| 504 | Bolted connection -1- (87F), in relay plate |
| A99 | Connection -1- (87), in dash panel wiring harness |
| A100 | Connection -2- (87), in dash panel wiring harness |
| E30 | Connection (87a), in engine wiring harness |
Wiring Diagram SEAT LEON 2002 - Motronic control unit - Lambda probe after catalytic converter - Lambda probe 1 heater - after the catalytic converter - fuel pump relay
| F1 | Oil pressure switch |
| G22 | Speedometer sender (01086) |
| H11 | Oil pressure warning buzzer |
| J285 | Control unit with display in dash panel insert (01317) |
| K2 | Alternator warning lamp |
| K3 | Oil pressure warning lamp (00755) |
| K28 | Coolant temperature/coolant shortage warning lamp |
| K83 | Exhaust emissions warning lamp |
| K132 | Electronic accelerator drive warning lamp |
| S7 | Fuses in fuse box/relay plate |
| T14a | 14-pin connector, in wiring channel, left side |
| T32 | 32-pin connector, blue, in dash panel insert |
| T32a | 32-pin connector, green, in dash panel insert |
| 10 | Earth point, in plenum chamber |
| 85 | Earth connection -1-, in engine compartment wiring harness |
| B163 | Positive connection -1- (15), in interior wiring harness |
| D51 | Positive connection -1- (15), in engine compartment wiring harness |
| * | Self-diagnosis W line |
Wiring Diagram SEAT LEON 2002 - Fuel gauge sender - fuel pump (pre-supply pump) - coolant shortage indicator sender
| E86 | Call-up button for multifunction indicator |
| E109 | Memory switch for multifunction indicator |
| G1 | Fuel gauge (00664) |
| G3 | Coolant temperature gauge |
| G5 | Rev. counter (00662) |
| J119 | Multi-function indicator |
| J255 | Control unit for Climatronic (01320) |
| J285 | Control unit with display unit in dash panel insert (01317) |
| K105 | Reserve fuel warning lamp (01082) |
| T6d | 6 pin connector |
| T12d | 12 pin connector, in the Climatronic |
| T16b | 16 pin connector |
| T32 | 32 pin connector, blue, in the dashboard |
| T32a | 32 pin connector, green, in the dashboard |
| A13 | Connection (door contact switch) in dash panel wiring loom |
| A27 | Connection (speed signal), in dash panel wiring loom |
| * | Only in vehicles with M.F.A. |
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