Wiring Diagram SEAT LEON 2002 - Battery - starter - alternator - voltage regulator - ignition/starter switch - X-contact relief relay
| A | Battery (00532) |
| B | Starter |
| C | Alternator |
| C1 | Voltage regulator |
| D | Ignition/starter switch |
| J59 | X-contact relief relay |
| S10 | Fuse in relay plate fuse holder |
| S162 | Fuse 1 (30) in fuse holder on battery |
| S163 | Fuse 2 (30) in fuse holder on battery |
| S176 | Fuse 4 (30) in fuse holder on battery |
| S177 | Fuse 5 (30) in fuse holder on battery |
| S229 | Fuse on fuse holder |
| T2k | 2-pin connector, on engine |
| T4l | 4-pin connector, on engine |
| T6l | 6-pin connector, brown, in connector protective housing, on left in plenum chamber |
| 500 | Screw connection 1 (30), on relay plate |
| 501 | Screw connection 2 (30), on relay plate |
| 502 | Screw connection 1 (30a), on relay plate |
| 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 |
| * | only models with air conditioning system |
Wiring Diagram SEAT LEON 2002 - Motronic control unit - ignition coil 1 with output stage - ignition coil 2 with output stage - ignition coil 3 with output stage - ignition coil 4 with output stage
| J220 | Motronic control unit |
| N70 | Ignition coil 1 with output stage |
| N127 | Ignition coil 2 with output stage |
| N291 | Ignition coil 3 with output stage |
| N292 | Ignition coil 4 with output stage |
| P | Spark plug connector |
| Q | Spark plugs |
| T4o | 4-pin connector |
| T4q | 4-pin connector |
| T4v | 4-pin connector |
| T4w | 4-pin connector |
| T6l | 6-pin connector, brown, in connector protective housing, on left in plenum chamber |
| T14a | 14-pin connector, in left wiring harness |
| T121 | 121-pin connector |
| 15 | Earth point, on cylinder head |
| 85 | Earth connection 1, in engine compartment wiring harness |
| 281 | Earth connection 1, in engine wiring harness |
| A104 | Positive connection 2 (15), in dash panel wiring harness |
| D10 | Positive connection (30), in front right wiring harness |
| D52 | Positive connection (15a), in engine compartment wiring harness |
Wiring Diagram SEAT LEON 2002 - Motronic control unit - engine temperature sender - oil level and oil temperature sender - ignition coil 5 with output stage
| G27 | Engine temperature sender (01204) |
| G266 | Oil level and oil temperature sender (00562) |
| J220 | Motronic control unit |
| J293 | Radiator fan control unit (00831) |
| N323 | Ignition coil 5 with output stage |
| P | Spark plug connector |
| Q | Spark plugs |
| V51 | Continued coolant circulation pump |
| T4y | 4-pin connector |
| T14 | 14-pin connector |
| T14a | 14-pin connector, in left wiring harness |
| T121 | 121-pin connector |
| 10 | Earth point, in plenum chamber |
| 85 | Earth connection 1, in engine compartment wiring harness |
| 281 | Earth connection 1, in engine wiring harness |
| D52 | Positive connection (15a), in engine compartment wiring harness |
| * | only models with extended servicing intervals |
Wiring Diagram SEAT LEON 2002 - Motronic control unit - coolant temperature sender - knock sensor 1 - knock sensor 2
| G2 | Coolant temperature display sender (01039) |
| G61 | Knock sensor 1 (00524-2142) |
| G62 | Coolant temperature display sender (00522-2312) |
| G66 | Knock sensor 2 (00540-2144) |
| J220 | Motronic control unit |
| T2r | 2-pin connector, on left of cylinder head |
| T3e | 3-pin connector, near intake manifold |
| T10d | 10-pin connector, green, in connector protective housing, on left in plenum chamber |
| T14a | 14-pin connector, in left wiring harness |
| T121 | 121-pin connector |
| 139 | Earth connection (sender earth), in Motronic wiring harness |
| 220 | Earth connection (sender earth), in engine wiring harness |
| 241 | Earth connection 2 engine earth, in engine wiring harness |
Wiring Diagram SEAT LEON 2002 - Motronic control unit - throttle valve module - engine speed sender - throttle valve drive for electric throttle
| G28 | Engine speed sender (00513-2111) |
| G186 | Throttle valve drive (electric power control) |
| G187 | Throttle valve drive angle sender 1 for electric throttle |
| G188 | Throttle valve drive angle sender 2 for electric throttle |
| J220 | Motronic control unit |
| J293 | Radiator fan control unit (00831) |
| J338 | Throttle valve module (01165) |
| T3b | 3-pin connector, on radiator fan |
| T6n | 6-pin connector |
| T10 | 10-pin connector, orange, in connector protective housing, on left in plenum chamber |
| T14 | 14-pin connector |
| T121 | 121-pin connector |
| 220 | Earth connection (sender earth), in engine wiring harness |
| * | only models with multifunction display |
Wiring Diagram SEAT LEON 2002 - Motronic control unit - Hall sender - accelerator position sender - Hall sender 2 - accelerator position sender 2
| G40 | Hall sender (00515-2113) |
| G79 | Accelerator position sender (00777-3131) |
| G163 | Hall sender 2 (01122) |
| G185 | Accelerator position sender 2 |
| J220 | Motronic control unit |
| J255 | Climatronic control unit (01320) |
| J293 | Radiator fan control unit (00831) |
| T6m | 6-pin connector, on accelerator |
| T10 | 10-pin connector, orange, in connector protective housing, on left in plenum chamber |
| T10h | 10-pin connector, blue, in connector protective housing, on left in plenum chamber |
| T12e | 12-pin connector |
| T14 | 14-pin connector |
| T16b | 16-pin connector |
| T121 | 121-pin connector |
| 220 | Earth connection (sender earth), in engine wiring harness |
| D106 | Connection 4, in engine compartment wiring harness |
Wiring Diagram SEAT LEON 2002 - Motronic control unit - injector - cylinder 1 - injector - cylinder 2 - injector - cylinder 3 - injector - cylinder 4 - injector - cylinder 5
| J220 | Motronic control unit |
| N30 | Injector for cylinders 1 (01249-4411) |
| N31 | Injector for cylinders 2 (01250-4412) |
| N32 | Injector for cylinders 3 (01251-4413) |
| N33 | Injector for cylinders 4 (01252-4414) |
| N83 | Injector for cylinders 5 (01253-4421) |
| S232 | Fuse on fuse holder |
| T10 | 10-pin connector, orange, in connector protective housing, on left in plenum chamber |
| T10d | 10-pin connector, green, in connector protective housing, on left in plenum chamber |
| T14a | 14-pin connector, in left wiring harness |
| T121 | 121-pin connector |
| 10 | Earth point, in plenum chamber |
| 131 | Earth connection 2, in engine compartment wiring harness |
| B168 | Connection (86), in interior wiring harness |
| D95 | Connection (injectors), in engine compartment wiring harness |
| * | Wire W for self-diagnosis |
Wiring Diagram SEAT LEON 2002 - Motronic control unit - lambda probe - lambda probe after catalytic converter - activated charcoal filter system solenoid valve 1 - lambda probe heater
| G39 | Lambda probe (00525-2342) |
| G130 | Lambda probe after catalytic converter (00699) |
| J220 | Motronic control unit |
| J299 | Secondary air pump relay (01264-4311) |
| N80 | Activated charcoal filter system solenoid valve 1 (pulsed) (01247-4343) |
| Z19 | Lambda probe heater |
| Z29 | Lambda probe 1 heater after catalytic converter |
| T4p | 4-pin connector, centre in engine compartment |
| T6q | 6-pin connector, on exhaust pipe |
| T121 | 121-pin connector |
| D108 | Connection 6, in engine compartment wiring harness |
| E7 | Positive connection (87a), in Motronic wiring harness |
Wiring Diagram SEAT LEON 2002 - Air mass meter - secondary air pump motor - Motronic control unit - secondary air inlet valve
| G70 | Air mass meter |
| J104 | ABS control unit with EDL |
| J220 | Motronic control unit |
| N112 | Secondary air inlet valve |
| V101 | Secondary air pump motor |
| T10d | 10-pin connector, green, in connector protective housing, on left in plenum chamber |
| T25 | 25-pin connector |
| T47 | 47-pin connector |
| T121 | 121-pin connector |
| 10 | Earth point, in plenum chamber |
| A121 | Connection (high bus), in dash panel wiring harness |
| A122 | Connection (low bus), in dash panel wiring harness |
| E30 | Connection (87a), in engine wiring harness |
Wiring Diagram SEAT LEON 2002 - Motronic control unit - electric fuel pump relay - charge pressure control solenoid valve - variable intake manifold change-over valve
| F36 | Clutch pedal switch (00650) |
| J17 | Fuel pump relay (01259-4433) |
| J220 | Motronic control unit |
| J234 | Airbag control unit (01321) |
| N75 | Charge pressure control solenoid valve (01262-4442) |
| N156 | Variable intake manifold change-over valve (01243-4334) |
| N205 | Inlet camshaft control valve 1 |
| T6l | 6-pin connector, brown, in connector protective housing, on left in plenum chamber |
| T10 | 10-pin connector, orange, in connector protective housing, on left in plenum chamber |
| T10d | 10-pin connector, green, in connector protective housing, on left in plenum chamber |
| T75 | 75-pin connector, behind centre console |
| T121 | 121-pin connector |
| A20 | Connection (15a), in dash panel wiring harness |
| A27 | Connection (speed signal), in dash panel wiring harness |
| A125 | Connection (crash signal), in dash panel wiring harness |
| D102 | Connection 2, in engine compartment wiring harness |
Wiring Diagram SEAT LEON 2002 - Fuel gauge sender - fuel system pressurisation pump - coolant shortage indicator sender
| G | Fuel gauge sender (00771-3113) |
| G6 | Fuel system pressurisation pump |
| G32 | Coolant shortage indicator sender |
| S228 | Fuse on fuse holder |
| S234 | Fuse on fuse holder |
| S243 | Fuse on fuse holder |
| T6l | 6-pin connector, brown, in connector protective housing, on left in plenum chamber |
| T14a | 14-pin connector, in left wiring harness |
| 81 | Earth connection 1, in dash panel wiring harness |
| 269 | Earth connection (sender earth) 1, in dash panel wiring harness |
| 504 | Screw connection 1 (87F), on relay plate |
| A99 | Connection 1 (87), in dash panel wiring harness |
| A100 | Connection 2 (87), in dash panel wiring harness |
Wiring Diagram SEAT LEON 2002 - Control unit with display in dash panel insert - oil pressure switch - speedometer sender - oil pressure warning buzzer - alternator warning lamp
| F1 | Oil pressure switch |
| G22 | Speedometer |
| H11 | Oil pressure warning buzzer |
| J285 | Control unit with display in dash panel insert |
| K2 | Alternator warning lamp |
| K3 | Oil pressure warning lamp |
| K28 | Coolant temperature and coolant shortage warning lamp |
| K83 | Exhaust emissions warning lamp |
| K132 | Electric power control fault lamp |
| S7 | Fuse in relay plate fuse holder |
| T14a | 14-pin connector, in left wiring harness |
| T32 | 32-pin connector, blue, on dash panel insert |
| T32a | 32-pin connector, green, on dash panel insert |
| B163 | Positive connection 1 (15), in interior wiring harness |
| * | only models with multifunction display |
Wiring Diagram SEAT LEON 2002 - Control unit with display in dash panel insert - multifunction display - multifunction display call-up button - multifunction display memory switch
| E86 | Multifunction display call-up button |
| E109 | Multifunction display memory switch |
| G1 | Fuel gauge |
| G3 | Coolant temperature gauge |
| G5 | Rev. counter |
| G21 | Speedometer |
| J119 | Multifunction display |
| J285 | Control unit with display in dash panel insert |
| K105 | Reserve fuel warning lamp |
| T5d | 5-pin connector, brown, coupling station, C-pillar left |
| T6d | 6-pin connector |
| T32 | 32-pin connector, blue, on dash panel insert |
| T32a | 32-pin connector, green, on dash panel insert |
| A13 | Connection (door contact switch), in dash panel wiring harness |
| A27 | Connection (speed signal), in dash panel wiring harness |
| * | only models with multifunction display |
| ** | Wire W for self-diagnosis |
| *** | only models up to April 2001 |
| --- | only models from May 2001 |
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