How to Change the Battery in Your BMW Key Fob
If your BMW key fob is acting up, the battery is likely the culprit. Replacing the battery in your BMW key fob is a simple task that you can easily handle yourself, saving you time and money. In this comprehensive guide, we’ll walk you through the step-by-step process for changing the battery in different BMW key fob models, from smart keys to comfort access and sleek slant-shaped designs. We’ll also cover troubleshooting tips and when to seek professional assistance. Whether you drive a 2020 BMW X3, a classic 3 Series, or any other BMW model, this guide has you covered.
Types of BMW Key Fobs and Their Batteries
Before we dive into the replacement process, it’s important to understand the different types of BMW key fobs and the batteries they use. Knowing which key fob you have will ensure you purchase the correct replacement battery.
Smart Key
BMW’s smart keys use a CR2450 battery. These keys are identified by their sleek, rectangular shape and the presence of a metal valet key that can be removed.
Comfort Access Key
Comfort access keys, found in many BMW models like the 1, 3, 5, 7, X3, X5, and X6 Series, require a CR2032 battery. These keys have a small indent or tab on the side that allows you to remove the valet key.
Non-Comfort Access Key
Some older BMW models have non-comfort access keys with a built-in rechargeable battery. This battery is not designed to be replaced by the user, so if it completely depletes, you’ll need to have the key replaced by a BMW technician.
Sleek Slant-Shaped Key
The sleek, slant-shaped key used in many F-Series BMW models, including the 3, 5, 7, and X3, also takes a CR2032 battery.
Diamond Key
The diamond-shaped key, found in some older BMWs, has a VL2020 battery. This key’s battery is not meant to be user-replaceable, and the entire key fob will need to be replaced if the battery dies.
Where to Find Replacement Batteries
Once you’ve identified the type of BMW key fob you have, you can easily find the necessary replacement battery. CR2450 and CR2032 batteries are widely available at local convenience stores, auto parts shops, hardware stores, and online retailers. Prices typically range from $5 to $10 for a single battery.
If you have a non-comfort access or diamond key, you’ll likely need to visit a BMW dealership or authorized service center to have the key fob replaced, as these batteries are not designed for user replacement.
Step-by-Step Guide to Replacing BMW Key Fob Batteries
Now that you know the key fob types and where to find the batteries, let’s walk through the process of actually replacing the battery in your BMW key fob.
Smart Key Battery Replacement
- Remove the metal valet key from the key fob.
- Locate the small gap or seam on the side of the key fob and use the valet key or a small flathead screwdriver to gently pry open the key fob case.
- Remove the old CR2450 battery and replace it with a new one, making sure the positive (+) side is facing up.
- Snap the key fob case back together, ensuring it clicks into place.
- Insert the metal valet key back into the key fob.
Comfort Access Key Battery Replacement
- Remove the valet key from the key fob.
- Locate the small access port on the key fob and use the valet key or a flat screwdriver to open the battery compartment.
- Remove the old CR2032 battery and replace it with a new one, again making sure the positive (+) side is facing up.
- Close the battery compartment and reassemble the key fob.
Non-Comfort Access Key Battery Replacement
As mentioned earlier, non-comfort access keys have a built-in rechargeable battery that is not designed for user replacement. If the battery has completely depleted, you’ll need to have the key fob replaced by a BMW technician.
Sleek Slant-Shaped Key Battery Replacement
- Press the button to remove the valet key from the key fob.
- Locate the small groove on the key fob and use the valet key to turn it clockwise.
- Remove the battery cover and take out the old CR2032 battery.
- Insert a new CR2032 battery, positive (+) side up.
- Replace the battery cover and snap the key fob back together.
Diamond Key Battery Replacement
The diamond-shaped key fob has a VL2020 battery that is not designed for user replacement. Attempting to replace this battery yourself is not recommended, as it requires cutting the plastic case and soldering a new battery in place. It’s best to have a BMW technician handle the replacement of this key fob.
Troubleshooting and Reprogramming the Key Fob
After replacing the battery in your BMW key fob, it should start working correctly again. However, if you’re still experiencing issues, there are a few things you can try:
- Verify Proper Battery Orientation: Double-check that you inserted the new battery with the positive (+) side facing the correct way.
- Reprogram the Key Fob: In some cases, the key fob may need to be reprogrammed to the vehicle. This is a simple process that can be done at home or by a BMW technician.
- Contact BMW Dealership: If the key fob still doesn’t work after changing the battery and reprogramming, there may be an issue with the key fob itself. In this case, it’s best to visit a BMW dealership or authorized service center for further diagnosis and potential replacement of the key fob.
It’s important to note that the battery replacement process may vary slightly depending on the specific BMW model and key fob type. Always refer to your owner’s manual or consult a BMW technician if you’re unsure about any part of the process.
Conclusion
Replacing the battery in your BMW key fob is a straightforward task that can save you time and money. By following the steps outlined in this guide, you can easily identify the correct replacement battery, access the key fob, and swap out the old battery for a new one. Remember to always handle the key fob with care, and don’t hesitate to seek professional assistance if you encounter any issues.
Keeping your BMW key fob in working order is essential for your driving experience. With this guide, you’ll be able to confidently maintain your key fob and get back on the road with ease. Happy driving!
