Wiring Diagram SEAT LEON 2004 - 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 |
| 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 |
| 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 |
| * | only models with air conditioning system |
| ** | only models with 120 A alternator |
| *** | only models with 90 A alternator |
Wiring Diagram SEAT LEON 2004 - Motronic control unit - terminal 30 voltage supply relay - ignition coils with output stage - spark plug connector - spark plugs
| J220 | Motronic control unit |
| J317 | Terminal 30 voltage supply relay |
| 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 |
| T2nd | 2-pin connector |
| T6l | 6-pin connector, brown, in connector protective housing, on left in plenum chamber |
| 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 |
| D52 | Positive connection (15a), in engine compartment wiring harness |
| D78 | Positive connection 1 (30a), in engine compartment wiring harness |
Wiring Diagram SEAT LEON 2004 - Motronic control unit - coolant temperature sender - charge air pressure sender - Hall sender - oil level and oil temperature sender
| G2 | Coolant temperature display sender |
| G31 | Charge air pressure sender |
| G40 | Hall sender |
| G62 | Coolant temperature display sender |
| G266 | Oil level and oil temperature sender |
| J220 | Motronic control unit |
| T10d | 10-pin connector, green, in connector protective housing, on left in plenum chamber |
| T14a | 14-pin connector, in left wiring harness |
| 10 | Earth point, in plenum chamber |
| 85 | Earth connection 1, in engine compartment wiring harness |
| 220 | Earth connection (sender earth), in engine wiring harness |
| D133 | Connection (hall sender signal), in engine compartment wiring harness |
| * | only models with extended servicing intervals |
Wiring Diagram SEAT LEON 2004 - Motronic control unit - engine speed sender - knock sensor 1 - knock sensor 2
| G28 | Engine speed sender |
| G61 | Knock sensor 1 |
| G66 | Knock sensor 2 |
| J220 | Motronic control unit |
| T2ni | 2-pin connector, on left of cylinder head |
| T2s | 2-pin connector, in rear engine compartment |
| T3b | 3-pin connector, on radiator fan |
| T10 | 10-pin connector, orange, in connector protective housing, on left in plenum chamber |
| 139 | Earth connection (sender earth), in Motronic wiring harness |
| 220 | Earth connection (sender earth), in engine wiring harness |
| * | only models with multifunction display |
Wiring Diagram SEAT LEON 2004 - Motronic control unit - throttle valve module - intake air temperature sender - throttle valve drive for electric throttle
| E35 | Air conditioning system switch |
| G42 | Intake air temperature sender |
| 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 |
| J255 | Climatronic control unit |
| J293 | Radiator fan control unit |
| J338 | Throttle valve module |
| T10 | 10-pin connector, orange, in connector protective housing, on left in plenum chamber |
| 10 | Earth point, in plenum chamber |
| 131 | Earth connection 2, in engine compartment wiring harness |
| 220 | Earth connection (sender earth), in engine wiring harness |
Wiring Diagram SEAT LEON 2004 - Motronic control unit - air mass meter - injector - cylinder 1 - injector - cylinder 2 - injector - cylinder 3 - injector - cylinder 4
| G70 | Air mass meter |
| J220 | Motronic control unit |
| N30 | Injector, cylinder 1 |
| N31 | Injector, cylinder 2 |
| N32 | Injector, cylinder 3 |
| N33 | Injector, cylinder 4 |
| 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 |
| B168 | Connection (86), in interior wiring harness |
| D95 | Connection (injectors), in engine compartment wiring harness |
| E30 | Connection (87a), in engine wiring harness |
| * | Wire W for self-diagnosis |
Wiring Diagram SEAT LEON 2004 - Motronic control unit - lambda probe - lambda probe after catalytic converter - activated charcoal filter system solenoid valve 1 - secondary air inlet valve
| F | Brake light switch |
| G39 | Lambda probe |
| G130 | Lambda probe after catalytic converter |
| J220 | Motronic control unit |
| N80 | Activated charcoal filter system solenoid valve 1 (pulsed) |
| N112 | Secondary air inlet valve |
| 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 |
| T10d | 10-pin connector, green, in connector protective housing, on left in plenum chamber |
| T10e | 10-pin connector, black, in connector protective housing, on left in plenum chamber |
| E30 | Connection (87a), in engine wiring harness |
| W1 | Positive connection 1 (54), in rear wiring harness |
Wiring Diagram SEAT LEON 2004 - Power assisted steering pressure switch - secondary air pump motor - secondary air pump relay - accelerator position sender - Motronic control unit
| F88 | Power assisted steering pressure switch |
| G79 | Accelerator position sender |
| G185 | Accelerator position sender 2 |
| J104 | ABS control unit with EDL |
| J220 | Motronic control unit |
| J299 | Secondary air pump relay |
| V101 | Secondary air pump motor |
| T10d | 10-pin connector, green, in connector protective housing, on left in plenum chamber |
| T10h | 10-pin connector, blue, in connector protective housing, on left in plenum chamber |
| 10 | Earth point, in plenum chamber |
| A121 | Connection (high bus), in dash panel wiring harness |
| A122 | Connection (low bus), in dash panel wiring harness |
| D108 | Connection 6, in engine compartment wiring harness |
Wiring Diagram SEAT LEON 2004 - Motronic control unit - fuel pump relay - charge pressure control solenoid valve - variable camshaft timing valve -1-
| D | Ignition/starter switch |
| F36 | Clutch pedal switch |
| J17 | Fuel pump relay |
| J220 | Motronic control unit |
| J234 | Airbag control unit |
| N75 | Charge pressure control solenoid valve |
| N205 | Inlet camshaft control valve 1 |
| N249 | Turbocharger air recirculation valve |
| 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 |
| 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 2004 - Fuel gauge sender - fuel system pressurisation pump - coolant shortage indicator sender
| G | Fuel gauge sender |
| G6 | Fuel system pressurisation pump |
| G32 | Coolant shortage indicator sender |
| G169 | Fuel gauge sender 2 |
| 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 |
| 33 | Earth point, on right behind dash panel |
| 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 2004 - Control unit with display in dash panel insert - oil pressure switch - speedometer sender - buzzer and gong - alternator warning lamp
| F1 | Oil pressure switch |
| F4 | Reversing light switch |
| G22 | Speedometer |
| H3 | Buzzer and gong |
| 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 |
| T10 | 10-pin connector, orange, in connector protective housing, on left in plenum chamber |
| T14a | 14-pin connector, in left wiring harness |
| B163 | Positive connection 1 (15), in interior wiring harness |
| * | only models with multifunction display |
Wiring Diagram SEAT LEON 2004 - 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 |
| A13 | Connection (door contact switch), in dash panel wiring harness |
| * | only models with multifunction display |
| ** | Wire W for self-diagnosis |
SEAT LEON 2004 Overview of relay
| 1 - | Relay in left engine compartment |
| q | Position of relays → page 804/2 |
| 2 - | Relay on relay plate |
| q | Position of relays → page 804/3 |
| 2 - | Relay on the 13 position additional relay carrier above the relay plate |
| q | Position of relays → page 804/4 |
| Toledo/León | Fitting Locations | No. 804 / 2 |
| Toledo/León | Fitting Locations | No. 804 / 3 |
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| Toledo/León | Fitting Locations | No. 804 / 4 |
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| Toledo/León | Fitting Locations | No. 804 / 5 |
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