BMW 1-Series (E81, E82, E87, E88) fuse box and relay Diagrams (2004-2013)
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
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.
| No. | Amps | Assignment/Designation |
| F1 | 15A | up to 09.2005: Transmission control |
| 10A | as of 09.2006: Rollover protection controller | |
| F2 | 5A | up to 03.2007: Electrochromic interior rearview mirror as of 03.2007: Instrument cluster control unit OBDII socket |
| F3 | — | — |
| F4 | 5A | Car access system |
| F5 | 7.5A | up to 03.2007: Function control centrt, roof |
| 20A | as of 03.2007: Electric fuel pump | |
| F6 | 15A | up to 09.2007: Transmission control module |
| 5A | as of 09.2007: AUC sensor DC/DC converter |
|
| F7 | 20A | up to 03.2007: Control unit, independent/auxiliary heating |
| F8 | 5A | up to 03.2007: CD changer |
| 20A | as of 03.2007: Amplifier | |
| F9 | 10A | up to 03.2007: Active cruise control |
| F10 | — | — |
| F11 | 10A | up to 09.2007: Radio |
| 30A | as 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 |
|
| 20A | as 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 |
|
| F12 | 20A | up to 09.2007: Function control center, roof |
| 15A | as of 09.2007: Relay, electric vacuum pump | |
| F13 | 5A | Controller |
| F14 | — | — |
| F15 | 5A | AUC sensor |
| F16 | 15A | up to 03.2007: Right horn 03.2007-09.2007: Left horn Right horn |
| 10A | as 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 |
|
| F17 | 5A | up to 03.2007: Navigation system |
| 10A | as of 09.2007: N52 (125i, 130i): Exhaust flap USA: Diagnostic module for fuel tank leakage N43 (116i, 118i, 120i): Nitrogen oxide sensor |
|
| F18 | 5A | up to 03.2007: CD changer as of 03.2007: Electrochromic interior rearview mirror |
| F19 | 7.5A | up 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 |
| F20 | 5A | Dynamic stability control (DSC) |
| F21 | 7.5A | Driver door switch cluster Outside rearview mirrors |
| F22 | — | — |
| F23 | 10A | without USA: Digital tuner Video module USA: Satellite receiver Digital tuner US |
| F24 | 5A | Tire pressure control (RDC) |
| F25 | — | — |
| F26 | 10A | Telematic control unit (TCU) Universal charging and hands-free facility (ULF) Telephone transceiver (without TCU or ULF) Aerial splitter Compensator Eject box |
| F27 | 5A | Driver door switch cluster Telephone transceiver |
| F28 | 5A | Function control center, roof Park distance control (PDC) |
| F29 | 5A | AUC sensor (up to 03.2007) Driver’s seat heating module Passenger’s seat heating module |
| F30 | 20A | Front cigar lighter Charging socket, center console, rear Luggage compartment socket outlet |
| F31 | 30A | up to 09.2005: Dynamic stability control (DSC) |
| 20A | as 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) |
|
| F32 | 30A | up to 03.2007: Seat module, front left (with memory) Driver’s seat heating module (without memory) as of 03.2007: Seat module, front left |
| F33 | 30A | up 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 |
| 5A | as of 03.2007: Comfort access control unit Outer door handle electronic module, driver’s side Outer door handle electronic module, passenger’s side |
|
| F34 | 30A | up to 03.2007: Amplifier |
| 5A | as of 03.2007: CD changer | |
| F35 | 20A | up to 09.2005: N46 (118i, 120i), N45 (116i): Electric fuel pump N52 (125i, 130i), M47/TU2 (118d, 120d): Fuel pump control (EKPS) |
| 30A | as of 09.2005: Dynamic stability control (DSC) | |
| F36 | 30A | Footwell module |
| F37 | 30A | up 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 |
| 10A | 03.2007-09.2007: 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 |
|
| 30A | as 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 |
|
| F38 | 30A | as 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 |
| F39 | 30A | up 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 |
| F40 | 20A | up 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) |
| 7.5A | as of 03.2007: Function control center, roof | |
| F41 | 30A | Footwell module |
| F42 | 30A | up 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 |
| 40A | as of 03.2007: Footwell module | |
| F43 | 30A | Headlight washer pump |
| F44 | 30A | Trailer module |
| F45 | 20A | up to 09.2005: Trailer socket |
| 40A | 09.2005-03.2007: Active steering | |
| 30A | as of 03.2007: Seat module, front right | |
| F46 | 30A | Lockout circuit for rear window defogger (positive) |
| F47 | 20A | as of 09.2005: Trailer socket |
| F48 | 20A | Intermittent wipe/wash control unit, rear |
| F49 | 30A | up to 03.2007: Passenger’s seat heating module 03.2007-09.2007: Seat module, front right |
| 40A | as of 09.2007: Active steering | |
| F50 | 40A | up to 09.2005: Active steering |
| 10A | as of 03.2007: DME control unit | |
| F51 | 50A | Car access system |
| F52 | 50A | up to 03.2007: Footwell module |
| 20A | as of 03.2007: Driver’s seat heating module | |
| F53 | 50A | up to 03.2007: Footwell module |
| 20A | as of 03.2007: Passenger’s seat heating module | |
| F54 | 60A | up to 03.2007: B+ potential distributor |
| 30A | as of 03.2007: Trailer module | |
| F55 | — | — |
| F56 | 15A | Central locking |
| F57 | 15A | Central locking |
| F58 | 5A | Instrument cluster OBD II socket |
| F59 | 5A | Steering column switch cluster |
| F60 | 7.5A | Heating/air conditioning system |
| F61 | 10A | Central information display Glove compartment light Luggage compartment light, right |
| F62 | 30A | Window control |
| F63 | 30A | Window control |
| F64 | 30A | Window control |
| F65 | 40A | Dynamic stability control (DSC) |
| F66 | 50A | Fuel heater |
| F67 | 50A | up to 03.2007: Blower output stage |
| 30A | as of 03.2007: Blower output stage | |
| F68 | 50A | up to 03.2007: Relay, electric vacuum pump |
| 40A | as of 03.2007: Footwell module | |
| F69 | 50A | Electric fan |
| F70 | 50A | Secondary air injection pump N45 (116i): Electric vacuum pump |
| F71 | 20A | Trailer socket |
| F72 | 15A | N45, N45/TU2 (116i): Relay, electric vacuum pump |
| F73 | 10A | N46/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 |
| F74 | 10A | 03.2007-09.2007: N52 (125i, 130i): Exhaust flap USA: Diagnostic module for fuel tank leakage as of 09.2007: N43 (116i, 118i, 120i): Nitrogen oxide sensor |
| F75 | — | — |
| F76 | 20A | 03.2007-09.2007: 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 |
| 30A | 03.2007-09.2007: N52 (125i, 130i): Oil condition sensor DISA actuator 1 DISA actuator 2 Fuel tank vent valve Crankshaft sensor Air mass flow sensor |
|
| F77 | 30A | N43 (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 |
| F78 | 30A | N43 (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 |
| F79 | 30A | 03.2007-09.2007: 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 | — | — |
| F81 | 30A | Trailer module |
| F82 | — | — |
| F83 | — | — |
| F84 | 30A | Headlight washer pump |
| F85 | — | — |
| F86 | — | — |
| F87 | — | — |
| F88 | 20A | up to 09.2007: Fuel pump control (EKPS) |
| 30A | as of 09.2007: Blower output stage |
| No. | Assignment/Designation |
| 1 | Wiring harness connector |
| 2 | Double relay for electric fuel pump/fanfare horn (M47TU2 fanfare horn only) is mounted on the PCB in the housing |
| 3 | Term. 30g_f relay (only installed in connection with corresponding equipment) is mounted on the PCB in the housing |
| 4 | Term. 15 relay is mounted on the PCB in the housing |
| 5 | Term. 30g relay |
| 6 | Power supply |
| 7 | Relay for windscreen washer system |
| 8 | Relay for secondary air pump |
| 9 | Internal interface, junction box control unit |
| 10 | Relay for rear window wiper |
| 11 | Relay for heated rear window |
| 12 | Relay for wiper stage 1 |
| 13 | Relay for wiper stage 2 is mounted on the PCB in the housing |
| No. | Amps | Assignment/Designation |
| F103 | — | — |
| F104 | — | Battery sensor |
| F105 | 100A | Electronic power steering (EPS) |
| F106 | 100A | Electric auxiliary heater |
| F108 | 250A | Junction box |
| F203 | 100A | Jumpstart terminal point – DDE main relay |
N54 (135i)
| No. | Amps | Assignment/Designation |
| F01 | 30A | 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 |
| F02 | 30A | DME control unit Coolant thermostat Electric coolant pump Characteristic map thermostat Exhaust camshaft sensor Exhaust VANOS solenoid Intake camshaft sensor Intake VANOS sensor Wastegate valves |
| F03 | 20A | Crankshaft sensor Fuel tank vent valve Oil condition sensor Volume control valve |
| F04 | 30A | Crankcase breather heaters Oxygen sensor heaters |
| F05 | — | — |
| F06 | 10A | E-box fan Exhaust flap USA: Diagnostic module for fuel tank leakage |
| F07 | 40A | Electric coolant pump |
N52 (125i, 130i)
A6000 – Engine control module (ECM)
K6300 – DME main relay
K6319 – Valvetronic (VVT) relay
K6327 – Fuel injector relay
K6539 – Crankcase breather heating relay
| No. | Amps | Assignment/Designation |
| F01 | 30A | 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 |
| F02 | 30A | Coolant thermostat Electric coolant pump Exhaust camshaft sensor Exhaust VANOS solenoid Intake camshaft sensor Intake VANOS solenoid |
| F03 | 20A | Crankshaft sensor Engine control module (ECM) Fuel tank vent valve Mass airflow sensor Oil condition sensor Variable intake manifold controllers |
| F04 | 30A | Crankcase breather heater Oxygen sensor heaters |
| F05 | 30A | Fuel injector relay |
| F06 | 10A | EAC sensor E-box fan Exhaust flap Fuel tank leakage diagnostic module Junction box Secondary air injection mass airflow sensor |
| F07 | 40A | Valvetronic (WT) relay |
| F09 | 30A | Electric coolant pump |
| F010 | 5A | Crankcase breather heating relay Ignition coil, cylinder 1 Ignition coil, cylinder 2 Ignition coil, cylinder 3 Ignition coil, cylinder 4 |
N46 (118i, 120i)
| No. | Amps | Assignment/Designation |
| F01 | 20A | Fuel injector, cylinder 1 Fuel injector, cylinder 2 Fuel injector, cylinder 3 Fuel injector, cylinder 4 |
| F02 | 20A | VANOS solenoid valve, intake VANOS solenoid valve, exhaust Camshaft sensor II Camshaft sensor I Thermostat, characteristic map cooling |
| F03 | 30A | DME control unit Hot-film air mass meter Oil level sensor Crankshaft sensor Fuel tank vent valve Heating, crankcase breather |
| F04 | 10A | E-box fan Junction box |
| F05 | 30A | Oxygen 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) |
| F001 | 10A | Power-saving relay, terminal 15 |
| No. | Amps | Assignment/Designation |
| F0001 | 40A | Relay, variable valve timing gear |
N45 (116i)
| No. | Amps | Assignment/Designation |
| F01 | 30A | Hot-film air mass meter Fuel tank vent valve Oil level sensor Suction jet pump valve |
| F02 | 30A | Oxygen sensor before catalytic converter Oxygen sensor after catalytic converter |
| F03 | 20A | Fuel 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) |
| F04 | 30A | VANOS solenoid valve, intake VANOS solenoid valve, exhaust DME control unit |
| F05 | 30A | Power-saving relay, terminal 15 |
M47/TU2 (118d, 120d)
| No. | Amps | Assignment/Designation |
| F01 | 20A | Boost pressure adjuster 1 Hall-effect sensor, camshaft 1 Rail pressure control valve Volume control valve |
| F02 | 20A | Solenoid valve, exhaust gas recirculation Heating, crankcase breather Electric changeover valve, swirl flaps Oxygen sensor before the catalytic converter Preheating control unit Oil level sensor |
| F03 | 30A | B+ potential distributor – Digital diesel electronics control unit |
| F04 | 10A | E-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.