EONON 5.5m Extension Harness for BMW E46 E39 Radios

This extension cable is engineered to extend the factory radio power and data connections in BMW 3 Series and 5 Series models so you can install an Eonon head unit without cutting or splicing the original wiring. Designed specifically for use with Eonon model families listed below, the harness comes in two connector types (17-pin and 40-pin) to match late-1990s and early-2000s BMW trunk radio power sockets. Its 5.5 m length gives installers flexibility when routing cables through the cabin or trunk.

Which BMW models and years will this harness work with?

The harness supports specific E46 and E39 model year ranges depending on connector type. The 17-pin option fits earlier BMWs, while the 40-pin option fits later model years. Before ordering, verify your vehicle’s trunk radio power socket matches one of the connector types listed.

• 17-pin: BMW E46 (1998–2001) and BMW E39 (1996–2001)
• 40-pin: BMW E46 (2002–2005) and BMW E39 (2002–2003)
• Confirm socket location in trunk prior to purchase

How does the 5.5 m length help the installation process?

The extra length simplifies routing from the trunk or rear harness locations to the dashboard without tension. Installers can anchor connections away from heat and moving parts, and have room to dress the cable tidy for a professional finish.

• 5.5 meters provides ample slack for routing behind panels
• Easier positioning of the head unit during fitting and testing
• Allows cleaner cable management and strain relief placement

Can I use this harness with non-Eonon head units or other BMW models?

This extension is purpose-built for specific Eonon stereo models and the BMW models above; it will not reliably interface with unrelated head units or unsupported vehicle wiring. Using it with incompatible equipment can result in improper connections or loss of features.

• Only compatible with Eonon models listed in product details
• Not intended for factory or aftermarket stereos from other brands
• Check Eonon model compatibility before ordering

What should I check before buying and installing this harness?

Double-check the connector type and your vehicle’s model year, and confirm the Eonon head unit model you plan to use. If unsure, review the trunk radio power socket or consult installation photos to match the 17-pin or 40-pin layout.

• Verify your BMW’s year matches the connector compatibility lists
• Confirm the head unit is one of the supported Eonon models
• Inspect trunk tuner socket shape and pin count prior to purchase

This harness is intended for technicians, DIY installers, and BMW owners upgrading to a compatible Eonon multimedia head unit who want a non-destructive, reversible connection method. It’s well suited for professional installers needing extra cable length for clean routing, and for enthusiasts who prefer to keep factory wiring intact while fitting an aftermarket Eonon stereo. If your vehicle or head unit is not listed, choose a different adapter designed for that make and model.