The SEAT Leon Mk4 is a great car, but like any other vehicle, it can experience electrical problems from time to time. If you’re having trouble with an electrical component in your Leon, one of the first things you should check is the fuse box.
The fuse box is a central location where all of the electrical fuses for your car are located. If a fuse blows, it will prevent power from flowing to the component that it protects. This can be caused by some things, such as a short circuit or a bad connection.
Table of Contents
Fuse Box Locations
There are two fuse boxes in the SEAT Leon Mk4: one in the engine compartment and one in the passenger compartment.
- The engine compartment fuse box is located on the driver’s side, near the battery.
- The passenger compartment fuse box is located in the center console, under the armrest.
Instrument Panel
| Fuse Number | Components | Fuse Amps |
|---|---|---|
| 1 | – | – |
| 2 | – | – |
| 3 | Trailer | 25A |
| 4 | SCR, Adblue | 20A |
| 5 | Automatic gearbox lever | 25A |
| 6 | Interior light | 30A |
| 7 | Heated seats | 30A |
| 8 | Sunroof | 20A |
| 9 | Left door | 30A |
| 11 | Trailer | 15A |
| 12 | Right lights | 40A |
| 13 | Central locking | 40A |
| 14 | External Ethernet Amplifier | 30A |
| 15 | – | – |
| 16 | Airbag | 7.5A |
| 17 | SCR, engine relay, 1.5 | 10A |
| 18 | KESSY (keyless locking) | 7.5A |
| 19 | Instrument panel | 7.5A |
| 20 | Connectivity Box | 7.5A |
| 21 | Rear camera | 7.5A |
| 22 | – | – |
| 23 | – | – |
| 24 | 4×4 Haldex Control Unit | 15A |
| 25 | RGS+EBSS front seat belts | 25A |
| 26 | Right door | 30A |
| 27 | RGS+EBSS front seat belts | 25A |
| 28 | PHEV, Switching off the high voltage system for rescue tasks, Identified by a yellow label | 10A |
| 29 | Trailer | 15A |
| 30 | Radio | 30A |
| 31 | Trailer | 25A |
| 32 | – | – |
| 33 | – | – |
| 34 | 230V socket | 30A |
| 35 | Left lights | 40A |
| 36 | Air conditioner fan | 40A |
| 37 | Electric rear lid | 30A |
| 38 | – | – |
| 39 | Heated steering wheel | 10A |
| 40 | Alarm horn | 7.5A |
| 41 | Gateway | 7.5A |
| 42 | Automatic gearbox lever | 7.5A |
| 43 | Air conditioning and heating control panel, rear window heating, AC compressor | 10A |
| 44 | Diagnosis, handbrake switch, light switch, reverse light, interior lighting, lit-up door sill | 7.5A |
| 45 | Steering column | 7.5A |
| 46 | Radio display | 7.5A |
| 47 | Driving mode | 10A |
| 48 | USB | 7.5A |
| 49 | – | – |
| 50 | – | – |
| 51 | – | – |
| 52 | 12V socket | 20A |
| 53 | – | – |
| 54 | – | – |
| 55 | – | – |
| 56 | – | – |
| 57 | – | – |
| 58 | Parking sensors, park distance control unit, front camera, radar | 7.5A |
| 59 | Reverse switch, clima sensor, electrochromic mirror | 7.5A |
| 60 | Diagnosis, headlight control unit, headlight adjuster | 7.5A |
| 61 | Starter motor, clutch sensor | 7.5A |
| 62 | – | – |
| 63 | – | – |
| 64 | – | – |
| 65 | Sound amplifier | 10A |
| 66 | Rear window wiper | 15A |
| 67 | Heated rear window | 30A |
| In-line fuses: | ||
| 230V rear power sockets | 30A | |
| Electric driver’s seat | 15A |
Engine Compartment
| Fuse Number | Components | Fuse Amp. Rating |
|---|---|---|
| 1 | – | – |
| 2 | Engine control unit | 7.5A |
| 3 | Fuel pump control unit | 7.5A/10A/20A |
| 4 | Left headlight KL 30 Signal | 15A |
| 5 | Right headlight KL 30 Signal | 15A |
| 6 | – | – |
| 7 | Automatic gearbox pump | 30A |
| 8 | KL 30 Signal brake servo | 40A |
| 9 | Horn | 15A |
| 10 | Front windscreen washer | 30A |
| 11 | PHEV Climate | 7.5A |
| 12 | Automatic gearbox control unit | 15A/30A |
| 13 | ESP control unit | 25A |
| 14 | Auxiliary heater | 20A |
| 15 | ESP control unit | 40A |
| 16 | PHEV, Automatic gearbox unit | 50A |
| 17 | PTC | 40A |
| 18 | PTC | 40A |
| 19 | – | – |
| 20 | Front electronic differential | 15A |
| 21 | Engine control unit | 7.5A |
| 22 | Starter motor | 30A |
| 23 | Engine control unit (diesel/petrol) | 15A |
| 24 | Engine sensors | 7.5A/10A |
| 25 | Engine sensors | 7.5A/10A |
| 26 | Engine power supply | 7.5A/10A/15A |
| 27 | Lambda probe | 10A/15A |
| 28 | Engine | 10A/20A |
| 29 | Fuel pump control unit | 15A/20A/30A |
| 30 | Pressure pump 1.0 | 10A |
| 31 | – | – |
| 32 | – | – |
| 33 | PTC | 40A |
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Tom Smith is a passionate car mechanic and automotive enthusiast, specializing in the intricate world of car fuse boxes. With years of hands-on experience under the hood, he has earned a reputation as a reliable expert in his field. As the founder and content creator of the popular blog website 'carsfuse.com,' Tom has dedicated himself to sharing his extensive knowledge of car fuse boxes and electrical systems with the world.