This guide provides a detailed walkthrough of hardwiring a dash cam into a 2005 BMW E90 330d. While specific to this model, the principles and techniques can be applied to other BMWs and vehicles with similar fuse box layouts. Understanding your vehicle’s specific fuse box diagram is crucial before starting any wiring project.
Understanding the E90 Dash and Fuse Box
The E90’s fuse box, located behind the glove box panel, offers convenient access to various power sources for accessories like dash cams. Hardwiring ensures a clean installation and provides continuous power for features like parking mode recording. This guide focuses on utilizing “add-a-circuit” fuse taps (also known as piggyback fuses), allowing you to tap into existing circuits without modifying factory wiring.
Identifying the Necessary Fuse Taps
Two types of power connections are required for most dash cams:
- Constant 12V Power: This provides continuous power to the camera, even when the ignition is off, enabling parking mode.
- Switched 12V Power: This provides power only when the ignition is on, powering the camera during driving.
This installation uses add-a-circuit fuse taps for both connections. These taps allow you to add an additional circuit to an existing fuse slot, protecting both the new accessory and the original circuit.
Locating the Correct Fuses in the E90 Fuse Box
This installation utilizes the following fuse locations in the E90’s glove box fuse box:
- Switched 12V: Fuse slot #28. It’s important to note that the orientation of the fuse tap in this slot may affect functionality. Trial and error may be required to ensure proper connection.
- Constant 12V: A suitable constant 12V source was identified within the same fuse box. The exact fuse number used was not explicitly stated in the original document but can be determined using the fuse diagram located in your vehicle’s owner’s manual.
Refer to the fuse box diagram:
Grounding the Dash Cam
The ground wire (typically black) from the hardwire kit should be connected to a metal ground point within the vehicle. A suitable ground point can usually be found near the fuse box.
Conclusion
Hardwiring a dash cam to your E90 Dash offers a clean and professional installation. By utilizing add-a-circuit fuse taps, you can tap into the necessary power sources without modifying your car’s wiring. Always refer to your vehicle’s fuse box diagram and ensure you understand the function of each fuse before making any connections.
