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 |
| S11 | Fuse in fuse box/relay plate |
| S163 | Fuse -2- (30), in fuse box/battery |
| S176 | Fuse -4- (30), in fuse box/battery |
| S177 | Fuse -5- (30), in fuse box/battery |
| S229 | Fuse in fuse box |
| S237 | 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, 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 conditioner |
Wiring Diagram SEAT LEON 2004 - 4CV control unit (injection system) - coolant temperature sender - Hall sender - ignition transformer - spark plug connector - spark plug
| G2 | Coolant temperature sender |
| G40 | Hall sender |
| G62 | Coolant temperature sender |
| J448 | 4CV control unit (injection system) |
| N152 | Ignition transformer |
| P | Spark plug connector |
| Q | Spark plugs |
| T6l | 6-pin connector, brown, in protective housing for connectors, on left in plenum chamber |
| T14a | 14-pin connector, in cable channel left |
| 220 | Earth connection (sender earth), in engine wiring harness |
| A104 | Positive (+) connection -2- (15), in dash panel wiring harness |
| D101 | Connection -1-, in engine compartment wiring harness |
Wiring Diagram SEAT LEON 2004 - 4CV control unit (injection system) - throttle valve control unit - idling switch - engine speed sender
| E35 | Air conditioner switch |
| F60 | Idling switch |
| G28 | Engine speed sender |
| G69 | Throttle valve potentiometer |
| G88 | Throttle valve positioner potentiometer |
| J255 | Climatronic control unit |
| J293 | Radiator fan control unit |
| J338 | Throttle valve control unit |
| J448 | 4CV control unit (injection system) |
| V60 | Throttle valve positioner |
| T3d | 3-pin connector, near intake manifold |
| T10 | 10-pin connector, orange, in protective housing for connectors, on left in plenum chamber |
| 220 | Earth connection (sender earth), in engine wiring harness |
Wiring Diagram SEAT LEON 2004 - 4CV control unit (injection system) - intake air temperature sender - knock sensor 1 - intake manifold pressure sender - injectors cylinder 1 - 2 - 3 and 4
| G42 | Intake air temperature sender |
| G61 | Knock sensor I |
| G71 | Intake manifold pressure sender |
| J104 | ABS with EDL control unit |
| J448 | 4CV control unit (injection system) |
| N30 | Injector, cylinder 1 |
| N31 | Injector, cylinder 2 |
| N32 | Injector, cylinder 3 |
| N33 | Injector, cylinder 4 |
| S232 | Fuse in fuse box |
| T2r | 2-pin connector, on cylinder head, left |
| T10d | 10-pin connector, green, in protective housing for connectors, on left in plenum chamber |
| T14a | 14-pin connector, in cable channel left |
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| 131 | Earth connection -2-, in engine compartment wiring harness |
| 220 | Earth connection (sender earth), in engine wiring harness |
| B168 | Connection (86), in interior wiring harness |
| D95 | Connection (injectors), in engine compartment wiring harness |
| D102 | Connection -2-, in engine compartment wiring harness |
Wiring Diagram SEAT LEON 2004 - 4CV control unit (injection system) - lambda probe - activated charcoal filter system solenoid valve 1 - exhaust gas recirculation frequency valve
Wiring Diagram SEAT LEON 2004 - Fuel gauge sender - coolant shortage indicator sender - fuel pump (pre-supply pump)
| G | Fuel gauge sender |
| G6 | Fuel pump (pre-supply pump) |
| G32 | Coolant shortage indicator sender |
| N79 | Heater element (crankcase breather) |
| S228 | Fuse in fuse box |
| S234 | Fuse in fuse box |
| S243 | Fuse in fuse box |
| T6l | 6-pin connector, brown, in protective housing for connectors, on left in plenum chamber |
| T14a | 14-pin connector, in cable channel left |
| |
| 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 |
| E30 | Connection (87a), in engine wiring harness |
Wiring Diagram SEAT LEON 2004 - Control unit with display in dash panel insert - oil pressure switch - speedometer sender - oil pressure warning buzzer - alternator warning lamp
| F1 | Oil pressure switch |
| F4 | Reversing light switch |
| G22 | Speedometer sender |
| 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 warning lamp/coolant shortage warning lamp |
| K83 | Exhaust emissions warning lamp |
| K132 | Electronic power control fault lamp |
| S7 | Fuse in fuse box/relay plate |
| T10 | 10-pin connector, orange, in protective housing for connectors, on left in plenum chamber |
| T14a | 14-pin connector, in cable channel left |
| |
| 85 | Earth connection -1-, in engine compartment wiring harness |
| B163 | Positive (+) connection -1- (15), in interior wiring harness |
| * | Wire W for self-diagnosis |
Wiring Diagram SEAT LEON 2004 - Control unit with display in dash panel insert - multi-function display - multi-function display call-up button - multi-function display - memory switch
| E86 | Multi-function display call-up button |
| E109 | Multi-function display, memory switch |
| G1 | Fuel gauge |
| G3 | Coolant temperature gauge |
| G5 | Rev. counter |
| G21 | Speedometer |
| J119 | Multi-function display |
| J255 | Climatronic control unit |
| J285 | Control unit with display in dash panel insert |
| K105 | Reserve fuel warning lamp |
| T6d | 6-pin connector |
| T12d | 12-pin connector, on Climatronic |
| A13 | Connection (door contact switch), in dash panel wiring harness |
| A27 | Connection (speed signal), in dash panel wiring harness |
| * | Only models with multi-function display |
SEAT LEON 2004 Overview of relay
Overview of relay | | |
SEAT LEON 2004 Relay on relay plate
Relay on relay plate | | 1 - | Dual tone horn relay -J4- (53) |
| 2 - | X-contact relief relay -J59- (100) |
| 4 - | Fuel pump relay -J17- (409) |
| - | Glow plug relay -J52- (103) |
| V y Vl - | Automatic intermittent wash and wipe relay -J31- |
| - | with rain sensor, with/without headlight washer system (192) |
| - | without rain sensor, with headlight washer system (389) |
| - | without rain sensor, without headlight washer system (377) |
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| SEAT LEON 2004 Relay on the 13 position additional relay carrier above the relay plate
Relay on the 13 position additional relay carrier above the relay plate | | 10 - | Fuel pump relay (turbo diesel engine unit injectors) (167) -J17- (up to October 2002) |
| - | Fuel pump relay (TDI-PD) (53) (from November 2002) |
| 11 - | Automatic gearbox relay AG4 -J60- (175) |
| 12 - | Terminal 30 voltage supply relay -J317- (109) |
| 13 - | Radiator fan relay (53) |
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| | Right-handdrive vehicles: | | 6 - | Telephone switch-over relay | | 7 - | Radiator fan relay -J26- (53) | | 8 - | Terminal 30 voltage supply relay (109) | | 9 - | Automatic gearbox relay AG4 -J60- (175) | | 10 - | Fuel pump relay (turbo diesel engine unit injectors)-J17- (167) (up to October 2002) | | - | Fuel pump relay (TDI-PD) (53) (from November 2002) | | 12 - | Cigarette lighter relay Australia -J193- (53) | | |
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SEAT LEON 2004 Glow plug activation control unit:
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