BMW 3-Series (E90, E91, E92, E93) fuse box and relay Diagrams (2005-2010)

The BMW 3-Series, specifically the E90, E91, E92, and E93 models produced between 2005 and 2010, is a highly popular and well-regarded luxury compact car range. Known for its dynamic driving experience, refined design, and cutting-edge technology, the 3-Series has captured the hearts of car enthusiasts worldwide. The beginning of the production of the sedan e90 – 2005. The station wagon (E91), coupe (E92), and convertible (E93) went into production at the end of 2006. 

In this comprehensive article, we will delve into the various electrical components of the BMW 3-Series (E90, E91, E92, E93) and explore the essential roles of the fuse box and relay systems in their electrical architecture.

Electrical Components in the BMW 3-Series (E90, E91, E92, E93)

The BMW 3-Series (E90, E91, E92, E93) encompasses an array of sophisticated electrical components that contribute to its advanced functionality and performance. Among these components, the fuse box and relay systems play vital roles in ensuring the proper distribution and protection of electrical power throughout the vehicle.

Fuse Box System

The fuse box in the BMW 3-Series (E90, E91, E92, E93) is a critical component responsible for protecting the car’s electrical circuits from overloading or short circuits. Located in various positions within the vehicle, such as the glove compartment, engine compartment, or trunk, the fuse box houses a series of fuses that are designed to blow and interrupt the electrical circuit in case of a fault.

The fuses in the BMW 3-Series are typically color-coded to indicate their amperage rating and protect specific electrical functions. A blown fuse can be easily identified by a visible break in the metal strip inside the fuse. If an electrical components malfunctions, such as the headlights or audio system, checking the fuse box for a blown fuse is an essential troubleshooting step. The fuse box diagram, often found on the fuse box cover or in the owner’s manual, provides a map of the fuse positions and their corresponding electrical functions.

Relay System

The relay system in the BMW 3-Series (E90, E91, E92, E93) works in conjunction with the fuse box to control the flow of electrical power to various components and systems. Relays are electromagnetic switches that activate or deactivate the circuit they are associated with. They serve as intermediaries between the electrical switches and the actual electrical components, ensuring the correct operation and coordination of various functions.

Relays in the BMW 3-Series can be found in different locations, depending on the specific model and component. Common relays include those for the fuel pump, radiator fan, headlights, and wipers. A malfunctioning relay can lead to the failure of the associated electrical component. If a specific system or component stops working, checking the relay related to that function can help identify the issue. The relay diagram, usually located in the fuse box cover or owner’s manual, provides information on the location and purpose of each relay.

MUST READ: DYI – How to Check Car Fuses?

(2005-2010) BMW 3-Series (E90, E91, E92, E93) 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.

BMW 3-Series (E90, E91, E92, E93) 2005-2010 fuse assignment

Fuse box locations

1. Rear power distribution panel (high amperage fuses)
2. Junction box fuse panel (←-03.2007 / 03.2007-09.2007 / 09.2007-→)
3. E-box engine electronics fuse carriers

Behind glove compartment (to 03.2007)

• I01068 – Relay, terminal 30g
• I01069 – Relay, terminal 15 (on PC board)
• K2 – Horn relay (on PC board)
• K6 – Headlight washer relay
• K13 – Rear window defroster relay
• K36 – Wiper relay 1
• K37 – Wiper relay 2
• K91 – Rear wiper relay (Sports Wagon)
• K6304 – Secondary air injection pump relay

Behind glove compartment (03.2007 – 09.2007)

• I01068 – Relay, terminal 30g
• K36 – Wiper relay 1
• K37 – Wiper relay 2

Behind glove compartment (09.2007-2010)

• I01068 – Relay, terminal 30g
• K36 – Wiper relay 1
• K37 – Wiper relay 2

Rear power distribution panel

• Battery safety terminal (BST)
• Line to B+ junction, starter, and alternator
• Line to engine electronics
• Line to IBS electronics
• Line to junction box
• Battery sensor (IBS)
• Battery ground cable
• High amperage fuses (fusible links)
• Housing
• High current connector
• Battery

Engine electronics fuses (non-turbo to 03.2007)

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

Engine electronics fuses (turbo from 03.2007)

Engine electronics fuses (non-turbo to 03.2007)

• A6000 – Engine control module (ECM)
• K6319 – Valvetronic relay
• K9137 – Electric cooling fan cutoff relay

Engine electronics fuses (turbo from 03.2007)

• A6000 – Engine control module (ECM)
• K9137 – Electric cooling fan cutoff relay

Secondary air injection pump relay (2009-2010 non-turbo)

In conclusion, the BMW 3-Series (E90, E91, E92, E93) produced between 2005 and 2010 is a remarkable luxury compact car range renowned for its performance and advanced technology. Understanding the electrical components, such as the fuse box and relay systems, is crucial for troubleshooting electrical issues and maintaining the vehicle’s optimal functionality. Regular inspection and maintenance of the fuse box and relays, along with their respective diagrams and locations, can help ensure a reliable and enjoyable driving experience in the BMW 3-Series (E90, E91, E92, E93). Whether it’s diagnosing a malfunctioning electrical system or simply replacing a blown fuse, being familiar with the fuse box and relay diagrams and their locations can save time, effort, and potentially costly repairs.

The BMW 3-Series (E90, E91, E92, E93) fuse box and relay diagrams provide a clear overview of the electrical layout of the vehicle. They help identify the exact fuse or relay responsible for a specific function, making troubleshooting much more efficient. By referring to the diagrams, owners can quickly locate the fuse or relay they need to inspect or replace, eliminating guesswork and reducing the risk of damaging other components.

Additionally, the fuse box and relay diagrams can aid in understanding the electrical connections within the BMW 3-Series (E90, E91, E92, E93). This knowledge can be beneficial for enthusiasts and DIY enthusiasts who wish to undertake modifications or customizations to their vehicle’s electrical system. With the diagrams as a reference, they can ensure proper wiring and integration of new components without compromising the vehicle’s overall electrical integrity.

In summary, the fuse box and relay systems are integral components of the electrical architecture in the BMW 3-Series (E90, E91, E92, E93). The fuse box houses the fuses that protect various electrical circuits, while the relays control the flow of power to different components and systems. Understanding the fuse box and relay diagrams and their locations empowers owners to troubleshoot electrical issues effectively, maintain the vehicle’s optimal functionality, and even undertake electrical modifications with confidence. By leveraging these resources, BMW 3-Series (E90, E91, E92, E93) owners can ensure their vehicle’s electrical system operates smoothly and enjoy the driving experience this luxury compact car range has to offer.