BMW Reveals Four-Brain Tech Architecture in Upcoming iX3
BMW’s next-generation iX3 will feature four advanced computing units, signaling a major shift toward software-defined electric vehicles.
Elena Whitmore 
New digital backbone to support BMW’s electric transformation
BMW is preparing to launch its fully electric iX3 SUV this September, the first model in its Neue Klasse lineup equipped with a new software-driven vehicle architecture. At the core of this system are four high-performance control units, which the company refers to as "superbrains," each responsible for different key functions such as driving dynamics, autonomous features, infotainment, and secondary systems.
One of these units, named the “Heart of Joy,” will manage how the vehicle drives and feels. The remaining three will separately handle autonomous driving systems, BMW’s panoramic infotainment platform known as iDrive, and ancillary features like lighting and climate controls. This network of computing modules forms what BMW is calling a “digital nervous system,” aimed at redefining the inner workings of its electric vehicle lineup.
Lighter wiring and smarter energy use
To support this sophisticated digital setup, BMW is also overhauling its vehicle wiring structure. The automaker is introducing a “zonal wiring harness architecture,” which divides the vehicle’s electrical layout into four key zones: front, center, rear, and roof. This design eliminates the need for roughly 600 meters of traditional wiring, resulting in a 30% reduction in weight.
In addition to simplifying internal cabling, BMW is replacing around 150 standard fuses with intelligent alternatives known as smart e-fuses. These digital components can dynamically manage and distribute power, leading to an estimated 20% improvement in energy efficiency. The system also enhances safety and reduces the risk of unnecessary power drain, whether the vehicle is being driven, charged, or stationary.
Over-the-air updates and in-house software push
The new architecture is built around software flexibility, with over 1,000 software modules and an estimated 500 million lines of code embedded into the vehicle system. With 20GB of software onboard, future BMW models will support continuous over-the-air (OTA) updates, reducing the need for dealership visits.
As part of its long-term strategy, BMW is focusing on developing brand-defining technologies like driving dynamics and infotainment in-house. The company has already assembled a dedicated team of over 10,000 software engineers to support this initiative. For other components, such as standard driver-assist features, BMW plans to collaborate with leading tech partners.
The fully electric BMW iX3 will be the first production model to integrate these developments, offering a glimpse into how the company envisions its next generation of electric mobility.
