Owning a BMW 3 Series from 2013 to 2019 means you may need to replace the key fob battery at some point. This guide will walk you through the process step-by-step, ensuring you can do it quickly and easily. The following instructions apply to the trapezoid-style key fob.
- Pack of 2 batteries
- Lithium coin batteries for watches and electronic devices
- Has a power of 3 volts
Identifying the Key Fob Model
The first step is to ensure you have the correct key fob model. This guide covers BMW 3 Series models including:
- 316i
- 318i
- 320i
- 328i
- 330i
- 335i
- 340i
- ActiveHybrid 3
- 330e
- 316d
- 318d
- 320d ED
- 325d
- 328d
- 330d
- 335d
The key fob for these models has a distinctive trapezoid shape, making it easy to identify.
Getting Started
Before you start, make sure you have the required tools and a new battery. You will need:
- Flat-head screwdriver
- New CR2450 battery
You can purchase the CR2450 battery conveniently on Amazon.com.
Removing the Internal Key
First, flip the key fob over. You will see a button that you can press to release the internal key. Press this button and pull out the internal key.
Next, locate the hole on the side opposite to where the key was removed. This hole is crucial for the next step.
Opening the Key Fob
Insert the internal key into the hole. Push it in slightly and then pop it up toward you. This action will remove the back cover of the key fob, exposing the internal battery.
You will notice a slot where the key was inserted, which allows you to pop off the back cover easily.
Removing the Old Battery
Once the back cover is off, you will see the CR2450 battery. You can use a flat-head screwdriver or even a pair of nail clippers to pry the old battery out.
Make sure to note the orientation of the battery before removing it. The side with the words should be facing up.
Inserting the New Battery
Take your new CR2450 battery and insert it into the slot. Ensure that the side with the words is facing up, just like the old battery.
Once the new battery is in place, you can proceed to reassemble the key fob.
Reassembling the Key Fob
Take the back cover and align it with the key fob. Press it down until it snaps into place. Make sure it is securely fastened.
Finally, reinsert the internal key into its slot. Your key fob should now be fully functional with the new battery.
- Pack of 2 batteries
- Lithium coin batteries for watches and electronic devices
- Has a power of 3 volts
Conclusion
Replacing the battery in your BMW 3 Series key fob is a straightforward task that you can do yourself. With just a few tools and a new battery, you can avoid the hassle and cost of going to a dealership.
For more detailed guides on key fob replacements for other vehicles, visit Key Fob Replacement.
FAQ
What type of battery does the BMW 3 Series key fob use?
The key fob uses a CR2450 coin battery.
Where can I purchase a new CR2450 battery?
You can buy a new CR2450 battery from Amazon.
- Pack of 2 batteries
- Lithium coin batteries for watches and electronic devices
- Has a power of 3 volts
Do I need any special tools to replace the battery?
No, you only need a flat-head screwdriver or a pair of nail clippers.
How often should I replace the key fob battery?
The battery typically lasts a few years, but you should replace it when you receive a low battery warning.
Can I damage the key fob while replacing the battery?
As long as you follow the instructions carefully, you should not damage the key fob.