Ford Focus 3G (C346) – fuse and relay

The 3rd generation Ford Focus was produced in 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019 with sedan, hatchback, station wagon bodies and was supplied to the markets of more than 122 countries. This model was restyled in 2014. In our material, we will show where the 3rd generation Ford Focus fuse and relay boxes are located, their designation with boxes diagrams and photographs. Separately, we highlight the fuse responsible for the cigarette lighter. We will also show the general location of all electronic control units.

Ford Focus 3

The purpose of the fuses may differ from the one presented and depends on the year of manufacture, equipment level and country of delivery Ford Focus 3. And if the generation of the model is not suitable, study other descriptions: focus 1 and focus 2 .

Block arrangement

This diagram will show the general location of all electronic control units in the Ford Focus 3.


General scheme ford focus 3


1ABS electronic control unit
2Air conditioner electronic control unit
3Anti-theft alarm horn – on the right side of the luggage compartment
4Audio interface control unit
5Accumulator battery
6Diagnostic connector (DLC)
7DC / DC converter control unit
8Driver’s door control unit
9Rear left door electrical control unit
10Passenger door electrical control unit
11Rear right door electrical control unit
12Electronic engine control unit (ECM) – behind the left wheel arch trim
13Cooling fan motor control unit
14Cooling system radiator flap control unit
15Fuse / relay box, engine compartment 1
16Fuse / relay box, engine compartment 2
17Fuse / relay box, instrument panel
18Fuse / relay box, luggage compartment – left side of luggage compartment
19Glow plug control unit – behind the left wheel arch trim
20Headlamp control unit
21Heater blower motor resistor – next to blower motor
22Beep 1
23Beep 2
24Ignition switch control unit
25Instrument Cluster Interface Control Unit
26Instrument cluster control unit
27Remote control unit for central locking and engine start
28Lane tracking control unit

Ford Focus 3 has 3 main boxes with fuses and relays: in the cabin, under the hood and in the luggage compartment.

Passenger compartment

It is located under the dashboard, on the passenger side, behind the glove compartment, and is covered with trim.

the location of the unit in the cabin

Photo for example

Photo of the unit in the cabin


Block diagram in the salon Ford Focus 3


5620A Fuel pump
595A Transceiver passive anti-theft system
6010A Interior lighting, driver’s door control unit, glove box lighting, background lighting, overhead control unit, sunroof
6120A Cigarette lighter, rear socket
625A Rain sensor, humidity sensor, auto-dimming interior mirror
6310A Europe: Adaptive cruise control system
6510A Power tailgate latch release
6620A Driver’s door lock, double lock
677.5A Infotainment Display, SYNC Module, GPS Module, Compass, BVC
6815A Electric steering column lock
695A Instrument cluster
7020A Central locking
717.5 / 10A Air conditioning system, Heater control unit (mechanical air conditioner), dual-zone climate control
727.5A Steering wheel module
735 / 7.5A Diagnostic connector, battery of the anti-theft alarm siren
7415A High beam headlights
7515A Front fog light
7610A Reversing lamps
7720A Windshield washer, rear window washer
785A Ignition switch, start button, keyless entry / start system
7915A Hazard switch, audio system, navigation, DVD player, door lock switch
8020A Sunroof, sunblind
815A Interior control sensor, RF radio receiver
8220A Glass washer pump
8320A Central locking
8420A Unlock driver’s door, double lock
857.5A Radio, navigation, passenger airbag deployment switch, seat heating switch, parking heater, heater control unit (mechanical air conditioner), auxiliary heater, sunroof, air quality sensor, car temperature and humidity sensor, voltage quality control, front camera
8610A Airbag and seatbelt system control module, passenger presence recognition system, passenger airbag indicator, air conditioning system (mechanical air conditioning)
8715A Heated steering wheel
8825A Voltage quality module
89 –

The fuse number 61, 20A, is responsible for the cigarette lighter.

Engine compartment

Block layout example

Blocks under the hood

Mounting box

It is located on the left side of the engine compartment and is covered by a protective cover, on the back of which the current block diagram will be applied.


Photo block diagram under the hood ford focus 3


830А ESP
930A Heated rear window 40A Luggage compartment fuse box
1040A Heater motor
1130A Voltage quality module, Start-stop system
1230A Relay engine control valve EGR valve
1330A Starter relay
1440A Heated windshield (right side) 25A Rear power window
1525A Cooling fan, transmission control unit
1640A Heated windshield (left side) 20A Battery sensor
1720A Auxiliary heater
1820A Windshield wiper
2015A Sound signal
215A Brake light switch
2215A Battery Monitoring System 5A Parking Assistant
235A Coil relay, light switch
2420A Rear outlet 5A Heated windshield (right side)
2510A Power mirrors
2615/20 / 25A Transmission control unit
2715A Air Conditioning Compressor Clutch
285A MAF Sensor, Rear Camera, Adaptive Cruise Control 10A Rear View Camera, Collision Warning System
2920A Headlight washers 10A Rearview camera, collision warning system
305A Engine control unit
3115A Intercooler Fan (1.6L Duratorq TDCi)
3210A Exhaust Gas Recirculation Valve, Swirl Control Valves, Heated Exhaust Gas Oxygen Sensor (Engine Control Systems), Fan ECM Relay (Coil)
3310A Ignition coils
3410A Injectors, cooling system pump, adsorber purge valve
355 / 15A Active radiator shutters, Heated fuel filter (diesel engines), Water-in-fuel sensor, ECU, ignition coils
3610A Engine control unit 5A Active radiator shutters
375A ABS 15A Daytime running lights, headlamp control unit 20A Additional socket on the dashboard
3815A Engine control unit, transmission control unit
395A Headlamp control unit 15A Power driver’s seat
405A Power steering
4120A Body electronics unit
4215A Rear wiper
4315A Headlight range control, adaptive lighting
445A Adaptive cruise control
4510A Heated washer jets 15A Electric passenger seat
4625A Front power windows or Cooling fan
477.5A Heated mirrors
4815A Diesel flue gas filter evaporator 5A Electric mirrors

For additional sockets, fuses 24 and 37 at 20A can also be responsible.


R1Intercooler fan
R2Sound signal
R3Diesel flue gas filter evaporator or 14-18: Heated windscreen
R5Rear wiper
R6Cooling fan
R7Heated windshield
R8Cooling fan
R9Headlight washers
R10Cooling fan, Starter
R11A / C Compressor Clutch
R12Cooling fan
R13Heater motor
R14The engine control unit
R15Starter, Heated rear window

Power fuse box

It is in the form of high power fusible links and is located in the battery cover.

Power fuse box

DiagramPower fuse diagram


  • F1 (80A) Power steering control unit
  • F2 (150A) Starter
  • F3 (100A)
  • F4 (50A) Multifunction control module
  • F5 (80A) Additional heater
  • F6 (70A)
  • F7 –
  • F8 (50A) Cooling fan motor control unit
  • F9 (50A) Multifunction control module
  • F10 (60A) Glow plug control unit

Luggage compartment

Located behind the casing or protective cover.

Luggage compartment block ford focus 3

Photo for example

photo of the unit in the trunk


block diagram in the trunk ford focus 3


15A Coil Relay
210A Vehicle Keyless System Module
35A Door handles in vehicles with a keyless entry system
425A Door module (front left) (power window, central locking, electric folding mirrors, heated mirrors)
525A Door module (front right) (power window, central locking, electric folding mirrors, heated mirrors)
625A Door module (rear left) (power window)
725A Door module (rear right) (power window)
810A Europe: Anti-theft alarm siren
925A Power driver’s seat
10Windows, ’14 -’18: Audio amplifier
115A Vehicle Keyless System Module, 25A Power Passenger Seat
1210A Air conditioning system module (with start and stop module)
135A Instrument cluster (with start and stop module)
147.5A Display of the infotainment system, GPS module (with start and stop module)
1515A Audio system (with start and stop module)
2325A Audio amplifier
2430A Heated rear window
2520A Socket in the luggage compartment
2640A Trailer module
2840A Trailer module
295A Monitoring system for unvisited zones, monitoring system for observing road markings, Active City Stop system, rear view camera
305A Parking aid module
3315A Rear wiper relay
3415A Heated driver’s seat
3515A Heated passenger seat
375A Luke
415A Sliding towing device
4410A Power mirrors
457.5A Heated mirrors
465A Monitoring system for non-visible areas, monitoring system for compliance with road markings, rear view camera (with engine start / stop system)
R1Egnition lock
R2Heated rear window
R3Rear wiper
R5Anti-theft alarm siren
R6Auxiliary relay


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If you have any questions, ask them in the comments.

Comments 2

  • Should I plug my add fuse in the luggage compartment fuse box in slot 15 audio system with ( start stop module) for my after market amp’s remote wire if I only want my amp on when car acc is on

    • Hey, I figure you might still need some insight since no replies here.

      Im in the process of installing an active subwoofer under the seat, somewhat similar to your situation.

      GND is obvious, I hope. Find a point on the chassis where you connect through a screw etc.

      Power 12V+: Based on the power requirements, the wattage of your amp you need either a direct line from the battery with a suitable fuse in line or if lets say below 100W at max/peak performance, low enough (my sub is 50W nominal) you can try to piggy back a fuse which has reserve, but never replace the original fuse with a stronger one or you might blow something more important(and expensive). With higher power comes higher risk of blowing something, so a direct line is your best bet, assuming the amp is of the serious oomph kind and probably above 200W.

      Remote: your head unit should have an amp remote, amp power, amp ctrl wire/connection(my android has a bunch of RCA), you should connect the remote wire there. So when the head unit turns on it will also switch the amp.

      Not talking from experience since I havent done the install yet, but this is what I understood doing my research. Good luck

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