The BMW 1-Series, encompassing the E81, E82, E87, and E88 models produced from 2004 to 2013, is a compact luxury car that combines performance, style, and advanced features. As with any modern vehicle, the BMW 1-Series is equipped with a sophisticated electrical system that controls various functions of the car. In this article, we will delve into the electrical components of the BMW 1-Series, focusing on the fuse box and relay diagrams with their locations, to provide valuable insights for troubleshooting electrical issues and understanding the car’s electrical architecture.

Electrical System Overview

The electrical system of the BMW 1-Series plays a critical role in delivering power to the car’s various components and ensuring their proper functioning. The fuse box and relays are fundamental elements in this system. The fuse box, typically located in the engine bay or interior cabin, contains a series of fuses that safeguard the electrical circuits from overloads and short circuits. These fuses are designed to break the circuit when excess current flows, preventing damage to the components and wiring. The relay, on the other hand, acts as an electrical switch, controlling the flow of power to different components or systems when triggered by specific conditions. It allows the car’s electrical system to distribute power efficiently and activate or deactivate certain functions as needed.

The fuse box and relay diagrams, along with their respective locations, are crucial references when diagnosing and troubleshooting electrical issues in the BMW 1-Series. These diagrams provide a visual representation of the fuse box layout, indicating the specific fuses and relays assigned to different functions and systems of the car. By referring to the diagrams and locating the corresponding fuse or relay, owners and technicians can identify potential faults, such as blown fuses or faulty relays, and take appropriate measures to rectify them. The diagrams also serve as a helpful guide for conducting maintenance tasks and ensuring that the electrical system operates smoothly and reliably.

(2004-2013) BMW 1-Series (E81, E82, E87, E88) 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.

BMW 1-Series (E81, E82, E87, E88) 2004-2013 fuse assignment

Passenger compartment

bmw 1 series (e81, e82, e87, e88) 2004 2013 passenger compartment
bmw 1 series (e81, e82, e87, e88) 2004 2013 passenger compartment

This box is located behind the glove compartment, I also call it a glove box. The protective cover must be removed for access. For more details, see the video at the end of the article. 

bmw 1 series (e81, e82, e87, e88) 2004 2013 passenger compartment fuse box
bmw 1 series (e81, e82, e87, e88) 2004 2013 passenger compartment fuse box
No.AmpsAssignment/Designation
F115Aup to 09.2005: Transmission control
10Aas of 09.2006: Rollover protection controller
F25Aup to 03.2007: Electrochromic interior rearview mirror
as of 03.2007:
   Instrument cluster control unit
   OBDII socket
F3
F45ACar access system
F57.5Aup to 03.2007: Function control centrt, roof
20Aas of 03.2007: Electric fuel pump
F615Aup to 09.2007: Transmission control module
5Aas of 09.2007:
   AUC sensor
   DC/DC converter
F720Aup to 03.2007: Control unit, independent/auxiliary  heating
F85Aup to 03.2007: CD changer
20Aas of 03.2007: Amplifier
F910Aup to 03.2007: Active cruise control
F10
F1110Aup to 09.2007: Radio
30Aas of 09.2007:
   N52 (125i, 130i):
      Oil condition sensor
      DISA actuator 1
      DISA actuator 2
      Fuel tank vent valve
      Crankshaft sensor
      Air mass flow sensor
20Aas of 09.2007:
   N46/TU2 (118i, 120i), N45/TU2 (116i):
      Fuel injector, cylinder 1
      Fuel injector, cylinder 2
      Fuel injector, cylinder 3
      Fuel injector, cylinder 4
   N43 (116i, 118i, 120i):
      Oxygen sensor before catalytic converter
      Oxygen sensor 2 before catalytic converter
      Oxygen sensor after catalytic converter
F1220Aup to 09.2007: Function control center, roof
15Aas of 09.2007: Relay, electric vacuum pump
F135AController
F14
F155AAUC sensor
F1615Aup to 03.2007: Right horn
03.2007-09.2007: 
   Left horn
   Right horn
10Aas of 09.2007:
   N46/TU2 (118i, 120i), N45/TU2 (116i):
      E-box fan
      Crankshaft sensor
      Fuel tank vent valve
      Hot-film air mass meter
   N43 (116i, 118i, 120i):
      E-box fan
      Crankshaft sensor
      Variable intake system: Position sensor and actuator
      Air mass flow sensor
      Radiator shutter drive unit
   N52 (125i, 130i):
      EAC sensor
      Secondary air pump relay
      E-box fan
F175Aup to 03.2007: Navigation system
10Aas of 09.2007:
   N52 (125i, 130i):
       
Exhaust flap
      USA: Diagnostic module for fuel tank leakage
   N43 (116i, 118i, 120i):
      Nitrogen oxide sensor
F185Aup to 03.2007: CD changer
as of 03.2007: Electrochromic interior rearview mirror
F197.5Aup to 03.2007:
   Comfort access control module
   Outer door handle electronic module, driver’s side
   Outer door handle electronic module, passenger’s side
   Siren and tilt alarm sensor
as of 03.2007: Siren and tilt alarm sensor
F205ADynamic stability control (DSC)
F217.5ADriver door switch cluster
Outside rearview mirrors
F22
F2310Awithout USA:
   Digital tuner
   Video module
USA:
   Satellite receiver
   Digital tuner US
F245ATire pressure control (RDC)
F25
F2610ATelematic control unit (TCU)
Universal charging and hands-free facility (ULF)
Telephone transceiver (without TCU or ULF)
Aerial splitter
Compensator
Eject box
F275ADriver door switch cluster
Telephone transceiver
F285AFunction control center, roof
Park distance control (PDC)
F295AAUC sensor (up to 03.2007)
Driver’s seat heating module
Passenger’s seat heating module
F3020AFront cigar lighter
Charging socket, center console, rear
Luggage compartment socket outlet
F3130Aup to 09.2005: Dynamic stability control (DSC)
20Aas of 09.2005:
   Radio (with RAD Radio or RAD2-BO User interface)
   CCC/M-ASK (with M-ASK-BO User interface or CCC-BO User interface)
F3230Aup to 03.2007:
   Seat module, front left (with memory)
   Driver’s seat heating module (without memory)
as of 03.2007: Seat module, front left
F3330Aup to 03.2007:
   Switch, passenger’s seat adjustment
   Switch for passenger’s seat backrest width adjustment
   Passenger’s lumbar support switch
   Valve block for passenger’s seat backrest width adjustment
   Valve block, front right lumbar support
5Aas of 03.2007:
   Comfort access control unit
   Outer door handle electronic module, driver’s side
   Outer door handle electronic module, passenger’s side
F3430Aup to 03.2007: Amplifier
5Aas of 03.2007: CD changer
F3520Aup to 09.2005:
   N46 (118i, 120i), N45 (116i):
      Electric fuel pump
   N52 (125i, 130i), M47/TU2 (118d, 120d):
      Fuel pump control  (EKPS)
30Aas of 09.2005: Dynamic stability  control (DSC)
F3630AFootwell module
F3730Aup to 03.2007:
   Switch for driver’s seat backrest width adjustment
   Driver’s lumbar support switch
   Valve block for driver’s seat backrest width adjustment
   Valve block, front left lumbar support
10A03.2007-09.2007: 
   Switch for passenger’s seat backrest width adjustment
   Switch for driver’s seat backrest width adjustment
   Passenger’s lumbar support switch
   Driver’s lumbar support switch
   Valve block for driver’s seat backrest width adjustment
   Valve block for driver’s seat backrest width adjustment
   Valve block, front left lumbar support
   Valve block, front left lumbar support
30Aas of 09.2007:
   N52 (125i, 130i):
      DME control unit
      Electric coolant pump
      Thermostat, characteristic map cooling
      Intake camshaft sensor
      Exhaust camshaft sensor
      VANOS solenoid valve, intake
      VANOS solenoid valve, exhaust
F3830Aas of 09.2007:
   N52 (125i, 130i):
      Oxygen sensor before catalytic converter
      Oxygen sensor 2 before catalytic converter
      Oxygen sensor after catalytic converter
      Oxygen sensor 2 after catalytic converter
      Crankshaft breather heating 1
F3930Aup to 09.2007: Wiper motor
as of 09.2007:
   N52 (125i, 130i):
      Fuel injector, cylinder 1
      Fuel injector, cylinder 2
      Fuel injector, cylinder 3
      Fuel injector, cylinder 4
      Fuel injector, cylinder 5
      Fuel injector, cylinder 6
      Ignition coil, cylinder 1
      Ignition coil, cylinder 2
      Ignition coil, cylinder 3
      Ignition coil, cylinder 4
      Ignition coil, cylinder 5
      Ignition coil, cylinder 6
      Interference suppression capacitor for ignition coils
F4020Aup to 09.2005:
   Radio (with RAD Radio or RAD2-BO User interface)
   CCC/M-ASK (with M-ASK-BO User interface or CCC-BO User interface)
as of 09.2005-03.2007:
   Electric fuel pump (without EKPS)
   Fuel pump control (EKPS)
7.5Aas of 03.2007: Function control center, roof
F4130AFootwell module
F4230Aup to 09.2005:
   Switch for driver’s seat backrest width adjustment
   Driver’s lumbar support switch
   Valve block for driver’s seat backrest width adjustment
   Valve block, front left lumbar support
09.2006-03.2007: Trailer module
40Aas of 03.2007: Footwell module
F4330AHeadlight washer pump
F4430ATrailer module
F4520Aup to 09.2005: Trailer socket
40A09.2005-03.2007: Active steering
30Aas of 03.2007: Seat module, front right
F4630ALockout circuit for rear window defogger (positive)
F4720Aas of 09.2005: Trailer socket
F4820AIntermittent wipe/wash control unit, rear
F4930Aup to 03.2007: Passenger’s seat heating module
03.2007-09.2007: Seat module, front right
40Aas of 09.2007: Active steering
F5040Aup to 09.2005: Active steering
10Aas of 03.2007: DME control unit
F5150ACar access system
F5250Aup to 03.2007: Footwell module
20Aas of 03.2007: Driver’s seat heating module
F5350Aup to 03.2007: Footwell module
20Aas of 03.2007: Passenger’s seat heating module
F5460Aup to 03.2007: B+ potential distributor
30Aas of 03.2007: Trailer module
F55
F5615ACentral locking
F5715ACentral locking
F585AInstrument cluster
OBD II socket
F595ASteering column switch cluster
F607.5AHeating/air conditioning system
F6110ACentral information display
Glove compartment light
Luggage compartment light, right
F6230AWindow control
F6330AWindow control
F6430AWindow control
F6540ADynamic stability control (DSC)
F6650AFuel heater
F6750Aup to 03.2007: Blower output stage
30Aas of 03.2007: Blower output stage
F6850Aup to 03.2007: Relay, electric vacuum pump
40Aas of 03.2007: Footwell module
F6950AElectric fan
F7050ASecondary air injection pump
N45 (116i):
   Electric vacuum pump
F7120ATrailer socket
F7215AN45, N45/TU2 (116i):
   Relay, electric vacuum pump
F7310AN46/TU2 (118i, 120i), N45/TU2 (116i):
   Crankshaft sensor
   E-box fan
   Fuel tank vent valve
   Hot-film air mass meter
03.2007-09.2007:
   N52 (125i, 130i):
      EAC sensor
      Secondary air pump relay
      E-box fan
      Hot-film air mass meter
F7410A03.2007-09.2007:
   N52 (125i, 130i):
      Exhaust flap
      USA: Diagnostic module for fuel tank leakage
as of 09.2007:
   N43 (116i, 118i, 120i):
      Nitrogen oxide sensor
F75
F7620A03.2007-09.2007:
   N43 (116i, 118i, 120i):
      Oxygen sensor before catalytic converter
      Oxygen sensor 2 before catalytic converter
      Oxygen sensor after catalytic converter
   N46/TU2 (118i, 120i), N45/TU2 (116i):
      Fuel injector, cylinder 1
      Fuel injector, cylinder 2
      Fuel injector, cylinder 3
      Fuel injector, cylinder 4
30A03.2007-09.2007:
   N52 (125i, 130i):
      Oil condition sensor
      DISA actuator 1
      DISA actuator 2
      Fuel tank vent valve
      Crankshaft sensor
      Air mass flow sensor
F7730AN43 (116i, 118i, 120i):
   DME control unit
   Oil pressure control valve
   Intake camshaft sensor
   Exhaust camshaft sensor
   VANOS solenoid valve, intake
   VANOS solenoid valve, exhaust
N45/TU2 (116i):
   DME control unit
   Suction jet pump valve
   Intake camshaft sensor
   Exhaust camshaft sensor
   VANOS solenoid valve, intake
   VANOS solenoid valve, exhaust
   Heating, crankcase breather
N46/TU2 (118i, 120i):
   DME control unit
   Characteristic map thermostat
   Intake camshaft sensor
   Exhaust camshaft sensor
   VANOS solenoid valve, intake
   VANOS solenoid valve, exhaust
   Heating, crankcase breather
03.2007-09.2007:
   N52 (125i, 130i):
      Fuel injector, cylinder 1
      Fuel injector, cylinder 2
      Fuel injector, cylinder 3
      Fuel injector, cylinder 4
      Fuel injector, cylinder 5
      Fuel injector, cylinder 6
      Ignition coil, cylinder 1
      Ignition coil, cylinder 2
      Ignition coil, cylinder 3
      Ignition coil, cylinder 4
      Ignition coil, cylinder 5
      Ignition coil, cylinder 6
      Interference suppression capacitor for ignition coils
F7830AN43 (116i, 118i, 120i):
   Ignition coil, cylinder 2
   Ignition coil, cylinder 3
   Ignition coil, cylinder 4
   Interference suppression capacitor for ignition coils
N46/TU2 (118i, 120i), N45/TU2 (116i):
   Oxygen sensor before catalytic converter
   Oxygen sensor 2 before catalytic converter
   Oxygen sensor after catalytic converter
03.2007-09.2007:
   N52 (125i, 130i):
      DME control unit
      Electric coolant pump
      Thermostat, characteristic map cooling
      Intake camshaft sensor
      Exhaust camshaft sensor
      VANOS solenoid valve, intake
      VANOS solenoid valve, exhaust
F7930A03.2007-09.2007:
   N43 (116i, 118i, 120i):
      Oil condition sensor
      Heating, crankcase breather
      Electrical changeover valve, engine mount
      Fuel tank vent valve
      Volume control valve
      Characteristic map thermostat
   N46/TU2 (118i, 120i), N45/TU2 (116i):
      Ignition coil, cylinder 1
      Ignition coil, cylinder 2
      Ignition coil, cylinder 3
      Ignition coil, cylinder 4
   N52 (125i, 130i):
      Oxygen sensor before catalytic converter
      Oxygen sensor 2 before catalytic converter
      Oxygen sensor after catalytic converter
      Oxygen sensor 2 after catalytic converter
      Crankshaft breather heating 1
F80
F8130ATrailer module
F82
F83
F8430AHeadlight washer pump
F85
F86
F87
F8820Aup to 09.2007: Fuel pump control (EKPS)
30Aas of 09.2007: Blower output stage
bmw 1 series (e81, e82, e87, e88) 2004 2013 passenger compartment 2
No.Assignment/Designation
1Wiring harness connector
2Double relay for electric fuel pump/fanfare horn (M47TU2 fanfare horn only) is mounted on the PCB in the housing
3Term. 30g_f relay (only installed in connection with corresponding equipment) is mounted on the PCB in the housing
4Term. 15 relay is mounted on the PCB in the housing
5Term. 30g relay
6Power supply
7Relay for windscreen washer system
8Relay for secondary air pump
9Internal interface, junction box control unit
10Relay for rear window wiper
11Relay for heated rear window
12Relay for wiper stage 1
13Relay for wiper stage 2 is mounted on the PCB in the housing
ru10013840
ru10014005
No.AmpsAssignment/Designation
F103
F104Battery sensor
F105100AElectronic power steering (EPS)
F106100AElectric auxiliary heater
F108250AJunction box
F203100AJumpstart terminal point – DDE main relay

N54 (135i)

ru08270408
K6300 – DME main relay
ru08270423
A2076 – B+ power
No.AmpsAssignment/Designation
F0130AIgnition coil, cylinder 1
Ignition coil, cylinder 2
Ignition coil, cylinder 3
Ignition coil, cylinder 4
Ignition coil, cylinder 5
Ignition coil, cylinder 6
Interference suppression capacitor for ignition coils
F0230ADME control unit
Coolant thermostat
Electric coolant pump
Characteristic map thermostat
Exhaust camshaft sensor
Exhaust VANOS solenoid
Intake camshaft sensor
Intake VANOS sensor
Wastegate valves
F0320ACrankshaft sensor
Fuel tank vent valve
Oil condition sensor
Volume control valve
F0430ACrankcase breather heaters
Oxygen sensor heaters
F05
F0610AE-box fan
Exhaust flap
USA: Diagnostic module for fuel tank leakage
F0740AElectric coolant pump

N52 (125i, 130i)

ru08270550

A6000 – Engine control module (ECM)
K6300 – DME main relay
K6319 – Valvetronic (VVT) relay
K6327 – Fuel injector relay
K6539 – Crankcase breather heating relay

No.AmpsAssignment/Designation
F0130AIgnition coil, cylinder 1
Ignition coil, cylinder 2
Ignition coil, cylinder 3
Ignition coil, cylinder 4
Ignition coil, cylinder 5
Ignition coil, cylinder 6
Interference suppression capacitor for ignition coils
F0230ACoolant thermostat 
Electric coolant pump
Exhaust camshaft sensor
Exhaust VANOS solenoid
Intake camshaft sensor
Intake VANOS solenoid
F0320ACrankshaft sensor
Engine control module (ECM)
Fuel tank vent valve
Mass airflow sensor
Oil condition sensor
Variable intake manifold controllers
F0430ACrankcase breather heater
Oxygen sensor heaters
F0530AFuel injector relay
F0610AEAC sensor
E-box fan
Exhaust flap
Fuel tank leakage diagnostic module
Junction box
Secondary air injection mass airflow sensor
F0740AValvetronic (WT) relay
F0930AElectric coolant pump
F0105ACrankcase breather heating relay
   Ignition coil, cylinder 1
   Ignition coil, cylinder 2
   Ignition coil, cylinder 3
   Ignition coil, cylinder 4

N46 (118i, 120i)

ru10010852
No.AmpsAssignment/Designation
F0120AFuel injector, cylinder 1
Fuel injector, cylinder 2
Fuel injector, cylinder 3
Fuel injector, cylinder 4
F0220AVANOS solenoid valve, intake
VANOS solenoid valve, exhaust
Camshaft sensor II
Camshaft sensor I
Thermostat, characteristic map cooling
F0330ADME control unit
Hot-film air mass meter
Oil level sensor
Crankshaft sensor
Fuel tank vent valve
Heating, crankcase breather
F0410AE-box fan
Junction box
F0530AOxygen sensor before catalytic converter
Oxygen sensor after catalytic converter
Oxygen sensor 2 before catalytic converter (with 4 oxygen sensors)
Oxygen sensor 2 after catalytic converter (with 4 oxygen sensors)
F00110APower-saving relay, terminal 15
ru10011808
No.AmpsAssignment/Designation
F000140ARelay, variable valve timing gear

N45 (116i)

ru10012251
No.AmpsAssignment/Designation
F0130AHot-film air mass meter
Fuel tank vent valve
Oil level sensor
Suction jet pump valve
F0230AOxygen sensor before catalytic converter
Oxygen sensor after catalytic converter
F0320AFuel injector, cylinder 1
Fuel injector, cylinder 2
Fuel injector, cylinder 3
Fuel injector, cylinder 4
Crankshaft sensor
Camshaft sensor I
Camshaft sensor II
E-box fan
Junction box (fuel pump relay)
F0430AVANOS solenoid valve, intake
VANOS solenoid valve, exhaust
DME control unit
F0530APower-saving relay, terminal 15

M47/TU2 (118d, 120d)

ru10013044
No.AmpsAssignment/Designation
F0120ABoost pressure adjuster 1
Hall-effect sensor, camshaft 1
Rail pressure control valve
Volume control valve
F0220ASolenoid valve, exhaust gas recirculation
Heating, crankcase breather
Electric changeover valve, swirl flaps
Oxygen sensor before the catalytic converter
Preheating control unit
Oil level sensor
F0330AB+ potential distributor – Digital diesel electronics control unit
F0410AE-box fan
F05

In conclusion, the BMW 1-Series (E81, E82, E87, E88) from 2004 to 2013 is a remarkably compact luxury car with a sophisticated electrical system. The fuse box and relay diagrams, along with their respective locations, provide essential information for troubleshooting electrical issues and maintaining the car’s electrical components. By understanding the functions of the fuse box and relays, owners, and technicians can effectively diagnose and resolve electrical problems, ensuring the optimal performance and reliability of the BMW 1-Series. Regular inspection and maintenance of these electrical components, in accordance with the manufacturer’s recommendations, will help prevent potential issues and extend the lifespan of the car’s electrical system, ensuring a delightful driving experience for years to come.

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