Replacing the battery in your 2011 BMW 328i key fob is a straightforward process that can save you a trip to the dealership. This guide provides a step-by-step walkthrough, ensuring you can tackle this task with confidence. A failing key fob battery can manifest in several ways, such as inconsistent locking/unlocking or loss of personalized car settings. If you’re experiencing these issues, a new battery is likely the solution.
Replacing Your Key Fob Battery: Step-by-Step Instructions
Before you begin, gather the necessary tools: a sharp X-acto knife, a non-metallic pry tool (like a credit card), a soldering iron, solder, and a replacement VL2020 battery. Ensure the battery terminals are positioned correctly – they have a roughly 90-degree offset. You can find suitable replacement batteries online.
1. Opening the Key Fob
The 2011 BMW 328i key fob is sealed shut with adhesive. Carefully use the X-acto knife to cut along the seam of the fob, separating the two halves. Proceed slowly and with precision, avoiding deep cuts that could damage the internal circuit board (PCB).
2. Desoldering the Old Battery
Once open, you’ll see the battery connected to the PCB. Gently pry up the corner of the battery with your non-metallic tool, creating slight tension. This will make desoldering easier. Begin by desoldering the corner terminal, as it has a shorter lead. The terminal closer to the center has a longer lead and should be desoldered last.
3. Installing the New Battery
Position the new battery in the designated slots on the PCB. Secure it by holding the PCB edges and applying gentle downward pressure on the battery. Apply heat to the middle terminal first, followed by the corner terminal. The battery terminals should melt through the existing solder and secure themselves in place.
4. Testing and Reassembly
Before sealing the fob, perform a test fit and check if the key functions correctly. If all works as expected, you can reassemble the key fob. You can either purchase a new housing or use adhesive to seal the original halves back together.
Conclusion
Replacing the battery in your 2011 BMW 328i key fob is achievable with basic tools and careful execution. This guide outlines the necessary steps to successfully complete the process, saving you time and money. By following these instructions, you can restore your key fob to full functionality and avoid the inconvenience of a dead battery.
