BMW 1 (2012 – 2018) F20 F21 fuse and relay

BMW F20 is the second generation of the BMW 1 Series five-door compact hatchback, the BMW F21 introduces its three-door version. Both of these models were produced in 2012, 2013, 2014, 2015, 2016, 2017, 2018. In our material, we will show a description of fuses and relays BMW f20 f21 with fuse box diagrams, their locations and photographs. Note the fuse responsible for the cigarette lighter

bmw f20

Check the current purpose of fuses and relays with your brochure, which should be in the luggage compartment or other technical documentation. In case of difficulty, contact your dealer.

Engine compartment

Main fuse box

It is located on the right side under the protective cover.

Block under the hood bmw f20

Photo for example

photo of the unit under the hood


block diagram under the hood


1815A Diagnostic connector
1910A Engine control
205A Audio control unit, roof electronics
215A Control unit
227.5A Door locks
Passenger rearview mirror, interior lighting
2310A DDE main relay
24Electronic automatic transmission (EAT) control unit, 4*4
255A Touchbox, audio
Body control unit, abs, praking
265A Seat heating
2710A Driver/passenger seat lumbar support valve block, driver/passenger side seat adjustment switch block
285A Front left lamp
Front right lamp
Rain sensor
Interior lighting
295A Coolant pump
32Transfer box, security system
3315A Coolant pump
Air conditioning compressor
Additional water pump
3410A Safety system, seat belt
4015A Headlights, outdoor lighting, dimensions
42Electrochromic rearview mirror
445A Driver support systems based on a video camera, active steering system
455A Cruise control
465A Crankcase ventilation heater
Coolant shut-off valve, louvre
475A Night vision electronics (NVE), vehicle sound generator (VSG)
4810A Steering column switches
505A Instrument cluster
527.5A Instrument cluster
535A Glove box lighting, instrument panel trim strip lighting (driver/passenger side), instrument panel trim strip lighting on driver’s side, driver/passenger footwell lighting
547.5A Selector switch
555A Electronic power steering (EPS)
565A Air quality sensor, ventilation system
5740A Fuse box, Headlights, outdoor lighting, dimensions
5830A Dynamic Stability Control (DSC)
6230A Retractable roof
6330A Transfer box
6420A Front passenger seat heating module
6520A Driver seat heating module
6620A Cigarette lighter
6730A Driver’s seat control unit
Driver seat adjustment
6830A Passenger seat adjustment
Passenger seat control unit
6920A 12V socket
7020A Heating

Fuses 66 and 69 for 20A are responsible for the operation of the cigarette lighter.

Power fuse box

A power fuse box is installed next to the fuse and relay boxes


Diagram 2


  • FL1 – 50/80/125A Trip relay
  • FL2 – 125A Electronic power steering (EPS)
  • FL3 – 100A Additional heater
  • FL4 – 40A Heated fuel filter
  • FL5 – 40A Dynamic Stability Control (DSC)
  • FL6 – 40A Fan motor

Relays and fuses of the DDE unit and a 50A fuse for the coolant pump, relay of the electric fan K5 can also be installed nearby.

additional elements under the hood

Additional box

It is located on the left side of the undercap space.

Block under the hood 2

Here you can find: the main engine relay DDE K2085 and engine control fuses (Rail pressure control valve, Fuel volume regulator, Camshaft position sensor, Boost pressure regulator solenoid, Oxygen sensor, Mass flow meter, Oil level sensor, EGR cooler changeover valve)

Luggage compartment

There can be three fuse boxes in the luggage compartment. The fuse box, located behind the casing on the right side, the second and third near the battery (power box with red cover) and the main fuse and relay box.

blocks in the trunk f20


trunk block diagram

Naminal in the trunk

Check the designation of the fuses and relays with your diagrams from the fuse card.

Table with designation

Purpose of fuses bmw f20 - 21

Passenger compartment

It is mounted on the right pillar, under the passenger side trim.

The location of the unit in the cabin f20


Block in the cabin


  1. Reserve (not occupied)
  2. Reserve (not occupied)
  3. Reserve (not occupied)
  4. Power window, front passenger door
  5. Central locking
  6. Window regulator, driver’s door
  7. Central locking
  8. Reserve (not occupied)
  9. Reserve (not occupied)
  10. Light control panel, driver assistance control unit and steering column switch cluster
  11. Rear Electronic Module (REM) and Headlight Driver Module
  12. Integrated heating and air conditioning control, dynamic stability control and on-board diagnostics
  13. Outside door handle electronics, contactless tailgate opening, Combox communication station and analysis
  14. Horn


That’s all. We have tried to describe in as much detail as possible all fuses and relays located in the BMW F20 / 21. And if you want to add something, write in the comments to the publication.

Comments 3

  • What cause indicator blinking fast on the left side and rear indicator not working I check globe its fine but no power going on the globe.. What can be the cause or problem.,any relay for the turning signals.. bmw F20 2017 model.

  • What would cause the horn not to work, full beam not working or doesn’t flash, volume on steering column doesn’t work, rain sensors not working, indicators flash fast? Frm/footwell module?

  • I have heating problems inside the cabin. Driver side warm as should passenger side very low temperature. When engine is running with climate control off I start heating up inside and will get both sides warm for 1 minute.

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