A dead BMW key fob battery can be a major inconvenience. It can leave you stranded and unable to start your car. Luckily, replacing the battery is a quick and easy fix you can often do yourself. This comprehensive guide will cover everything you need to know about BMW key fob batteries, from identifying the signs of a dying battery to replacing it and even programming a new one.
How to Tell if Your BMW Key Fob Battery is Dying
Your BMW key fob battery typically lasts three to four years, but this can vary depending on usage and environmental factors. Here are some telltale signs that your BMW key fob battery is dying:
- Decreased signal strength: You may notice that you need to be closer to your car for the key fob to work, or the signal may be intermittent.
- Slow response time: The car may take longer than usual to respond to the key fob, such as unlocking the doors or starting the engine.
- Multiple attempts required: You may find yourself pressing the buttons on your key fob multiple times to get it to work.
- Warning messages: Your BMW may display a warning message on the dashboard, indicating a low key fob battery.
Finding the Right BMW Key Fob Battery
Before you can replace your BMW key fob battery, you’ll need to know what type of battery it takes. The battery type can vary depending on the model and year of your BMW. Here are a few ways to find the correct battery:
- Consult your owner’s manual: Your BMW owner’s manual will have information on the type of battery your key fob uses.
- Check the existing battery: Carefully open your key fob (more on how to do this in the next section) and look at the battery. The battery type will be printed on the battery itself.
- Look online: Many online retailers that sell car batteries will allow you to search by your car’s make, model, and year to find the correct key fob battery.
It’s important to purchase a high-quality battery from a reputable brand to ensure optimal performance and longevity.
How to Replace a BMW Key Fob Battery: A Step-by-Step Guide
Replacing your BMW key fob battery is a relatively straightforward process. Here’s a step-by-step guide:
What you’ll need:
- The correct replacement battery for your BMW key fob
- A small flat-head screwdriver or a plastic pry tool
- Optional: A small container to keep track of the screws
Instructions:
- Open the key fob: Locate the small groove or notch on the side of your key fob. Carefully insert the flat-head screwdriver or pry tool into the groove and gently pry open the key fob.
- Locate the battery: Once the key fob is open, you should see the battery. It’s typically a small, round, flat battery.
- Remove the old battery: Carefully pry out the old battery using the screwdriver or your fingernail. Avoid touching the battery terminals.
- Install the new battery: Insert the new battery into the battery compartment, ensuring the positive (+) side is facing up. You should hear a click when it’s properly seated.
- Reassemble the key fob: Align the two halves of the key fob and press them firmly together until you hear a click.
- Test the key fob: Make sure the key fob is working correctly by testing all the buttons, including locking and unlocking the doors and starting the engine.
Programming Your BMW Key Fob After Battery Replacement
In most cases, your BMW key fob should automatically resync with your car after a battery replacement. However, if you’re having trouble getting your key fob to work after replacing the battery, you may need to reprogram it.
The process for programming your key fob varies depending on the model and year of your BMW. You can usually find instructions in your owner’s manual or online.
Frequently Asked Questions about BMW Key Fob Batteries
Here are some frequently asked questions about BMW key fob batteries:
Q: How long does a BMW key fob battery last?
A: A BMW key fob battery typically lasts three to four years, but this can vary depending on usage and environmental factors.
Q: Can I replace the battery in my BMW key fob myself?
A: Yes, replacing the battery in your BMW key fob is a relatively easy process that most people can do themselves.
Q: Do I need to program my BMW key fob after replacing the battery?
A: In most cases, your BMW key fob should automatically resync with your car after a battery replacement. However, if you’re having trouble, you may need to reprogram it.
Q: Can a dead key fob battery drain my car battery?
A: No, a dead key fob battery will not drain your car battery. The two batteries are separate systems.
Q: Where can I buy a replacement BMW key fob battery?
A: You can purchase replacement BMW key fob batteries at most auto parts stores, online retailers, and some dealerships.
Conclusion
A dead BMW key fob battery can be a frustrating experience. However, by understanding the signs of a dying battery and following the simple steps outlined in this guide, you can replace the battery yourself and get back on the road quickly. Remember to use a high-quality replacement battery and refer to your owner’s manual or seek professional assistance if you encounter any issues during the process.