Learn about Ford Focus (EU) (B4/C307; 2007-2010) fuse box and relay’s locations, functions, and maintenance tips for optimal vehicle electrical system.
The second-generation Ford Focus (B4/C307 platform) sold across Europe from 2007 to 2010 combined refined styling with a range of efficient petrol and diesel engines. As with any vehicle, its electrical system relies on fuses and relays to protect wiring from power surges, short circuits, and overloads that could otherwise cause costly damage.
If you’re dealing with issues like non-working headlights, a dead radio, or wipers that won’t respond, a blown fuse or faulty relay is often the cause. Knowing exactly where your Focus’s fuse boxes are located and how to access them safely, can help you resolve many common electrical problems yourself, saving time and money.
This guide covers the fuse box and relay locations for the 2007–2010 Ford Focus (B4/C307), along with practical access tips and safety precautions.
MUST READ: DYI – How to Check Car Fuses?
(2007-2010) Ford Focus (EU) B4/C307 fuse box and relay with Diagram
WARNING
- Never replace a fuse with one that has a higher amperage rating.
- A fuse with a too-high amperage could damage the electrical part and cause a fire.
- On no account should fuses be repaired (e.g. patched up with tin foil or wire) as this may cause serious damage elsewhere in the electrical circuit or cause a fire.
- If a fuse blows repeatedly, do not keep replacing it. Instead, have the cause for the repeated short circuit or overload tracked and fixed.
- Terminal and harness assignments for individual connectors will vary depending on vehicle equipment level, model, and market.
Ford Focus (EU) (B4/C307; 2007-2010) fuse assignment
Ford Focus (EU) B4/C307 Year of production: 2007, 2008, 2009, 2010
Where Are the Fuse Boxes Located on the Ford Focus (B4/C307)?
The 2007–2010 Ford Focus is equipped with two main fuse box locations: one in the engine compartment and one inside the cabin. This layout is standard across most trims and engine variants sold during this generation.
1. Engine Compartment Fuse Box
The primary fuse box is located in the engine bay, mounted near the battery, typically toward the rear corner of the compartment close to the firewall.
How to access it:
- Open the bonnet and locate the black plastic cover near the battery.
- Unclip the retaining tabs along the edges of the cover—most versions use tool-free snap-lock clips.
- Lift the cover straight up to reveal the fuses and relays inside.
This fuse box protects higher-amperage components such as the headlights, engine cooling fan, horn, and starter relay. Since this area is exposed to engine heat and road moisture, make sure the cover is properly reseated after inspection to prevent corrosion.
2. Interior Fuse Panel (Passenger Compartment Fuse Box)
The cabin fuse box is located inside the vehicle, typically behind the glovebox or at the end of the dashboard on the driver’s side, depending on trim level.
How to access it:
- If located behind the glovebox, open the glovebox fully and release the side stoppers to let it drop down further, exposing the fuse panel behind it.
- If located near the dashboard edge, open the driver’s door and locate the small access panel near the door hinge, then gently pull or unclip the cover.
- Once accessed, you’ll see the fuse layout along with several compact relays.
This panel controls interior circuits such as the radio, interior lighting, wipers, hazard warning lights, power windows, and central locking system.
3. Additional Relays Near the Battery
Beyond the main engine bay fuse box, certain standalone relays—such as the fuel pump relay, horn relay, or main relay—may be mounted separately near the battery or along the inner wing panel rather than housed within the primary fuse box.
How to access them:
- Inspect the area around the battery and inner wing panel for individually mounted relays plugged into the wiring harness.
- These relays can generally be pulled straight out of their socket for inspection or replacement.
Since these relays aren’t always grouped with the main fuse box, a wiring diagram specific to your Focus’s engine variant (petrol or diesel) is helpful for confirming exact locations.
How to Identify the Right Fuse or Relay
The fuse box covers typically include a printed diagram, either on the inside of the lid or on a label near the fuse block, listing each fuse and relay by number, amperage rating, and function.
When troubleshooting:
- Identify the malfunctioning component (e.g., “wipers” or “central locking”) and match it to its corresponding number on the diagram.
- Confirm the amperage rating on the old fuse matches the replacement before installing a new one.
- For relays, use a wiring diagram to confirm the correct location and function, since relays can look similar despite controlling different systems.
If the printed diagram is missing or difficult to read, refer to your owner’s manual or a verified fuse box diagram specific to your Focus’s model year and engine variant, as configurations can vary slightly between petrol and diesel versions, as well as between trim levels like Zetec, Titanium, or Ghia.
Safety Precautions Before Checking Fuses or Relays
- Turn off the ignition and remove the key before touching any fuse or relay.
- For more involved electrical work, disconnect the negative battery terminal to prevent accidental short circuits.
- Use a fuse puller tool or needle-nose pliers rather than metal screwdrivers, which can cause sparking.
- Never replace a fuse with one of a higher amperage rating than specified, as this can overload the circuit and create a fire hazard.
- If a replacement fuse blows immediately, stop and inspect the circuit for an underlying short rather than continuing to swap fuses.
- Given the age of this vehicle, inspect fuse box connectors and relay sockets for corrosion or wear, which can develop over time.
Checking and Replacing Fuses in Ford Focus (EU)
You can identify a blown fuse by a break in the filament. All fuses, except high current fuses are a push fit. A fuse puller is located in the lid of the engine compartment fuse box.
Location of Fuse Boxes
Passenger Compartment Fuse Box:
- Remove the screws in the instrument panel trim underneath the glove compartment and lower the trim panel.
- Loosen the screws.
- Lower the fuse box and pull it towards you.
- Install in the reverse order.
Engine Compartment Fuse Box:
Fuse Box Diagrams
2007-2010
Passenger Compartment Fuse Box
List of fuses in the passenger compartment fuse box (2007-2010)
| № | A | Circuits protected |
|---|---|---|
| 100 | 10A | Electronic modules ignition supply |
| 101 | 20A | Electric sunroof control module, driver’s electric seat, roof control module (convertible only) |
| 102 | 10A | Heater control, steering column, diesel particulate filter, remote control receiver |
| 103 | 10A | Lighting control battery supply |
| 104 | 10A | Battery saver, interior lamps |
| 105 | 25A | Heated rearwindow |
| 106 | 20A | Keyless system |
| 107 | 10A | Instrument cluster battery supply, on-board diagnostics |
| 108 | 7.5A | Accessory to cluster (audio and navigation unit) |
| 109 | 20A | Cigar lighter, rear auxiliary power socket |
| 110 | 10A | Daytime running lamps ignition supply to lighting control switch |
| 111 | 15A | Fuel pump (petrol engine only) |
| 112 | 15A | Audio modules battery supply |
| 113 | 10A | Daytime running lamps (parking lamps) |
| 114 | 10A | Instrument cluster ignition supply, engine immobiliser |
| 115 | 7.5A | Lighting control ignition supply |
| 116 | 20A | Fog lamps |
| 117 | 7.5A | Number plate lamps |
| 118 | 20A | Door module, left-hand rear |
| 119 | 15A | Luggage compartment auxiliary power socket |
| 119 | 25A | Luggage compartment auxiliary power socket (vehicles with trailer tow module) |
| 120 | 20A | Door module, right-hand rear |
| 121 | 20A | Heated front seats |
| 122 | 10A | Airbag module |
| 123 | 7.5A | Heated exterior mirrors |
| 124 | 7.5A | Parking lamps, side lamps, tail lamps (left-hand side) |
| 125 | 7.5A | Parking lamps, side lamps, tail lamps (right-hand side) |
| 126 | 20A | Keyless system |
| 127 | 25A | Electric Windows |
| 128 | – | Not used |
| 129 | 20A | Windscreen wipers |
| 130 | – | Not used |
| 131 | 15A | Rear window wiper |
| 132 | 15A | Brake lamps |
| 133 | 25A | Central locking relays, passenger door module |
| 134 | 20A | Central locking, driver door module |
| 135 | 20A | Daytime running lamps |
| 136 | 15A | Washer pump, heated washer jets |
| 137 | 10A | Battery backup sounder |
| 138 | 10A | Powertrain control module, accelerator pedal, automatic transmission |
| 139 | 10A | Main beam right-hand side |
| 140 | 10A | Main beam left-hand side |
| 141 | 10A | Reversing lamp, electric mirrors |
| 142 | 15A | Dipped beam, right-hand side |
| 143 | 15A | Dipped beam, left-hand side |
Engine Compartment Fuse Box
List of fuses in the engine compartment fuse box (2007-2010)
| № | A | Circuits protected |
|---|---|---|
| 1 | 40A | Cooling fan |
| 2 | 80A | Power steering |
| 3 | 60A | Passenger junction box supply 1 |
| 4 | 60A | Passenger junction box supply 2 |
| 5 | 80A | Auxiliary heater |
| 6 | 60A | Glow plug (diesel only) |
| 7 | 30A | ABS, stability control pump |
| 8 | 20A | ABS, stability control valves |
| 9 | 20A | Powertrain control module (PCM) |
| 10 | 30A | Climate control blower |
| 11 | 20A | Ignition switch |
| 12 | 40A | Ignition relay 151 |
| 13 | 20A | Starter solenoid |
| 14 | 40A | Heated windscreen, right-hand side |
| 15 | 30A | Cooling fan relay (Sigma – non A/C only) |
| 16 | 40A | Heated windscreen, left-hand side |
| 17 | 30A | Convertible roof |
| 18 | 30A | Power inverter |
| 19 | 10A | ABS module |
| 20 | 15A | Horn |
| 21 | 20A | Auxiliary heater |
| 22 | 10A | Power steering module |
| 23 | 30A | Headlamp washer |
| 24 | 15A | Auxiliary heater (diesel only) |
| 25 | 10A | Ignition, relays |
| 26 | 15A | Automatic transmission |
| 26 | 10A | PCM continuous supply (Focus ST and Focus RS only) |
| 27 | 10A | Air conditioning clutch |
| 28 | 10A | Glow plug monitoring (diesel only) |
| 29 | 10A | Dual zone climate control |
| 30 | 3A | PCM, automatic transmission |
| 31 | 10A | Battery sensor smart charging |
| 32 | 10A | Automatic transmission |
| 32 | 10A | Fuel injector power supply (Focus ST and Focus RS only) |
| 33 | 10A | Heated oxygen sensors (petrol only) |
| 33 | 10A | Intercooler bypass valve (diesel only) |
| 33 | 20A | Heated oxygen sensor (Focus ST and Focus RS only) |
| 34 | 10A | Injectors, ignition transformers |
| 35 | 10A | PCM, valves, solenoids |
| 36 | 10A | PCM |
Conclusion
Knowing the fuse box and relay locations on your 2007–2010 Ford Focus (B4/C307) makes it much easier to handle minor electrical issues without unnecessary guesswork. With two main fuse box locations one under the bonnet and one inside the cabin, plus a few standalone relays near the battery, this Focus generation is relatively simple to troubleshoot once you’re familiar with its layout.
Always handle fuses and relays with care, confirm amperage ratings before replacing any component, and use the printed diagram or a wiring reference to correctly identify each fuse or relay. If an electrical issue persists after replacing a fuse, or if you’re unsure about diagnosing the problem yourself, consulting a mechanic experienced with European Ford Focus models is a smart next step.
