Your BMW key fob is an essential part of your vehicle, and like any other electronic device, its battery will eventually die. Fortunately, changing the battery in a BMW key fob is a relatively simple process that can be done in just a few minutes. In this guide, we’ll walk you through the steps on how to change a battery in a BMW key fob, so you can get back to driving your car as soon as possible.
Before you begin, you’ll need to gather a few tools. You’ll need a small Phillips head screwdriver, a new CR2032 battery, and a clean cloth. Once you have your tools, you’re ready to start the process. First, use the screwdriver to remove the two screws that hold the key fob together. Once the screws are removed, you can carefully pry the two halves of the key fob apart. Be careful not to damage the circuit board or any of the other components inside the key fob.
Once the key fob is open, you’ll see the battery. It will be held in place by a small metal clip. Use the screwdriver to carefully pry the clip away from the battery. Once the clip is removed, you can lift the battery out of the key fob. Now, take the new battery and insert it into the key fob. Make sure that the positive (+) side of the battery is facing up. Then, use the screwdriver to put the metal clip back in place. Finally, put the two halves of the key fob back together and tighten the screws.
Identifying the Battery Type
To determine the correct battery type for your BMW key fob, you will need to identify the model of your key. The battery type varies depending on the key fob design and BMW model. Refer to the table below for the battery types associated with different BMW key fob models.
| Key Fob Model | Battery Type |
|---|---|
| BMW 1, 3, 5, 7 Series (2013-2019) | CR2032 |
| BMW X1, X3, X5, X6 (2014-2019) | CR2025 |
| BMW 2 Series (2015-2019) | CR2016 |
| BMW 4 Series (2014-2019) | CR2032 |
| BMW 6 Series (2013-2018) | CR2025 |
You can also find this information in your vehicle’s owner’s manual or by contacting a BMW dealership. Once you have identified the correct battery type, you can proceed with the battery replacement.
Safety Precautions
Before beginning, take these precautions to ensure your safety and the proper functioning of your BMW key fob:
1. Gather Necessary Materials
You will need the following materials:
- New CR2032 battery
- Small flathead screwdriver or pry tool
- Clean cloth or microfiber towel
2. Disconnect Battery
Disconnect the vehicle’s battery:
- Locate the negative terminal of the battery, typically marked with a black or negative (-) symbol.
- Use the wrench to loosen the nut connecting the negative terminal to the battery.
- Carefully lift off the negative terminal and move it away from the battery to prevent any accidental contact.
- Wait at least 10 minutes for the electrical system to discharge before proceeding. This will prevent any electrical shocks or damage to the key fob’s electronics.
3. Other Precautions
- Keep the key fob dry and clean. Moisture or dirt can damage the electronics.
- Avoid dropping or exposing the key fob to extreme temperatures. This can weaken the battery and shorten its lifespan.
- Never modify or open the key fob yourself. This can void your warranty and damage the fob.
- If the key fob stops working despite changing the battery, consult a qualified automotive technician.
Removing the Key from the Fob
To begin the process of replacing the battery in your BMW key fob, you must first remove the key itself from the fob. Here’s a detailed guide on how to do so:
Step 1: Locate the Key Release Button
Examine the side of the key fob and identify the small button labeled “Release” or marked with an arrow. This button is typically located near the top or bottom edge of the fob.
Step 2: Press and Hold the Key Release Button
Using your finger or a small tool, gently press and hold down the key release button. Keep it pressed for a few seconds.
Step 3: Slide Out the Key
While holding down the key release button, carefully slide the key out of the fob. The key should come out smoothly without any resistance. Release the key release button once the key is fully removed.
Additional Tips
- If you encounter any difficulty sliding out the key, try applying slightly more pressure to the key release button.
- Do not force the key out of the fob, as this could damage the internal mechanisms.
- If the key release button is not working or appears damaged, consult your BMW dealership or a qualified locksmith.
Opening the Battery Compartment
Opening the battery compartment on a BMW key fob requires careful attention to the key’s specific design. Here’s a detailed guide to assist you in this process:
1. Locate the Battery Compartment
Examine the key fob closely to identify the battery compartment. It’s typically a small, concealed area on the back or side of the fob.
2. Check for a Release Button
Some BMW key fobs feature a dedicated release button that allows you to open the battery compartment with ease. If present, press the button gently to release the compartment.
3. Use a Flathead Screwdriver
In case there’s no release button, you can use a small, flathead screwdriver to gently pry open the battery compartment. Insert the screwdriver into a small notch or crevice along the compartment’s edge and carefully leverage it open.
4. Careful and Precise Leverage
When using a screwdriver, apply gentle pressure and avoid excessive force. Work the screwdriver around the edges of the compartment, inserting it into multiple notches or crevices to distribute the force evenly. This prevents damaging the key fob or its internal components.
| Tips for Using a Screwdriver |
|---|
| Use a small, precision screwdriver with a flathead tip. |
| Apply gentle pressure and avoid sudden, forceful movements. |
| Work the screwdriver around the edges of the compartment for even distribution of force. |
| Avoid prying directly against the battery compartment’s cover, as this can damage the fob. |
Removing the Old Battery
The process of removing the old battery from your BMW key fob is generally straightforward but may vary slightly depending on the specific model and year of your vehicle.
Step 1: Locate the Battery Compartment
Begin by identifying the battery compartment on your key fob. It is typically located on the back or side of the fob and may be covered by a small rubber or plastic tab.
Step 2: Open the Battery Compartment
Use your fingernail or a thin object to carefully pry open the battery compartment. Be gentle to avoid damaging the fob.
Step 3: Remove the Old Battery
Once the compartment is open, you will see the old battery inside. Use a small screwdriver or tweezers to gently lift the battery out of its housing.
Step 4: Clean the Battery Contacts
Before inserting the new battery, it is important to clean the battery contacts inside the compartment to ensure a good electrical connection. Use a cotton swab or a soft brush to remove any dirt or debris.
Inserting the New Battery
Once you have opened the key fob, the next step is to insert the new battery. Here are the detailed steps involved:
1. Locate the Battery Compartment
Identify the small compartment inside the key fob that houses the battery. It usually has a small latch or release button that you can press to open it.
2. Remove the Old Battery
Carefully remove the old battery by gently prying it out with a small flathead screwdriver or a plastic spudger. Be careful not to damage the battery or the contacts it rests on.
3. Check the Battery Type
Make sure the new battery you have matches the type and voltage required by your BMW key fob. Common battery types used in BMW key fobs include CR2032, CR2025, and CR2016.
4. Orient the Battery Correctly
Insert the new battery into the compartment, ensuring that the positive (+) side of the battery is facing up and the negative (-) side is facing down. Match the orientation of the old battery for reference.
5. Secure the Battery
Once the battery is properly inserted, press the latch or release button to secure it in place. Make sure the battery is securely positioned and won’t come loose during use.
6. Test the Key Fob
After inserting the new battery, press the buttons on the key fob to test if it is functioning correctly. If the lights blink or the car responds to the commands, it indicates that the battery has been successfully replaced.
| Battery Type | Voltage |
|---|---|
| CR2032 | 3V |
| CR2025 | 3V |
| CR2016 | 3V |
Closing the Battery Compartment
Once the new battery is in place, it’s time to close the battery compartment. Here’s a detailed guide on how to do it:
- Align the Battery Compartment Cover: Carefully align the battery compartment cover with the key fob’s body.
- Slide the Cover Back: Gently slide the cover back into place until it fits snugly against the key fob.
- Apply Pressure: Apply gentle pressure along the edges of the cover to secure it in place.
- Check for a Tight Fit: Ensure the cover is securely attached and there are no gaps or loose areas.
- Test the Key Fob: Press the buttons on the key fob to check if it’s functioning correctly.
- Clean the Key Fob: If desired, you can clean the key fob’s surface with a soft cloth to remove any smudges or fingerprints.
- Store the Key Fob Safely: Keep your key fob in a safe and easily accessible place to avoid losing it.
Remember, always handle the key fob with care to avoid damaging its components. If you encounter any difficulties or have any concerns during the process, consult your owner’s manual or seek assistance from a qualified technician.
Reassembling the Key Fob
Now that the battery has been replaced, it’s time to put the key fob back together. Make sure that the rubber gasket around the buttons is properly seated before you snap the two halves of the shell together. The gasket helps to keep water and dust out of the key fob, which can damage the electronics.
A Step-by-Step Guide to Reassemble the Key Fob:
- Align the two halves of the shell and snap them together until you hear a click. The click indicates that the two halves are securely fastened.
- Insert the small screw into the hole on the back of the key fob and tighten it with a small screwdriver. The screw helps to keep the two halves of the shell together and prevents them from coming apart accidentally.
- Gently pull the key ring through the loop at the top of the key fob. Make sure that the key ring is securely attached to the loop so that you don’t lose your keys.
- Test the key fob by pressing the buttons and making sure that they work properly. If the buttons do not work, check that the battery is properly installed and that the contacts are clean.
- If the key fob is working properly, you have successfully replaced the battery. You can now use your key fob to unlock and lock your car as usual.
| Battery Type | Replacement Interval | |
|---|---|---|
| CR2032 | Every 3-4 years | |
| CR2025 | Every 5-6 years |
| Key Fob Model | Battery Type | Voltage |
|---|---|---|
| BMW 3 Series | CR2032 | 3.0V |
| BMW 5 Series | CR2025 | 3.0V |
| BMW X Series | CR2016 | 3.0V |
| BMW Z Series | CR2025 | 3.0V |
Materials You’ll Need
- New battery (CR2032 or CR2025, depending on your key fob model)
- Small screwdriver or key
Steps To Change The Battery
- Locate the key release button on the back of your key fob.
- Press the button and pull the metal key out.
- Use the screwdriver or key to gently pry open the key fob.
- Locate the battery inside the fob.
- Use the screwdriver or key to carefully remove the old battery.
- Insert the new battery into the fob, making sure the positive side is facing up.
- Snap the key fob back together.
- Insert the metal key back into the fob.
- Test the key fob to make sure it’s working properly.
- If it’s not working, check the battery connection and make sure the battery is properly seated.
Troubleshooting Common Issues
Key Fob Not Working
- Check if the battery is installed correctly and the positive side is facing up.
- Replace the battery with a new one to rule out a dead battery.
- Check if the key fob is paired with your car. You may need to reprogram it following the manufacturer’s instructions.
- If the key fob still doesn’t work, it may be damaged and need to be replaced.
Battery Draining Too Quickly
- Check if you have any additional devices or accessories connected to your key fob, such as Bluetooth trackers or keychains with built-in lights. These accessories can drain the battery faster.
- Replace the battery with a new one and monitor its life to see if the issue persists.
- If the battery continues to drain quickly, there may be an electrical issue with the key fob and it may need to be replaced.
Key Fob Buttons Not Working
- Check if the buttons are obstructed or stuck. Try cleaning them gently with a soft brush.
- Replace the battery to rule out a dead battery.
- If the buttons still don’t work, it may be a hardware issue and the key fob may need to be repaired or replaced.
How To Change A Battery In A Bmw Key Fob
The battery in your BMW key fob is a small, coin-sized battery that powers the key fob’s electronics. Over time, the battery will weaken and eventually need to be replaced. Replacing the battery is a simple process that can be done in a few minutes.
To change the battery in your BMW key fob, you will need a new battery and a small screwdriver. The type of battery you need will depend on the model of your key fob. You can find the correct battery type by checking the owner’s manual for your vehicle.
- Insert the screwdriver into the slot on the back of the key fob and pry it open.
- Locate the battery and remove it from the key fob.
- Insert the new battery into the key fob, making sure that the positive (+) terminal of the battery is facing up.
- Close the key fob and test it to make sure that it is working properly.
People Also Ask
How do I know if my BMW key fob battery is dead?
There are a few signs that may indicate that your BMW key fob battery is dead. These signs include:
- The key fob does not work when you press the buttons.
- The key fob does not unlock or lock your car when you press the buttons.
- The key fob’s LED light does not flash when you press the buttons.
How do I program a new BMW key fob?
Programming a new BMW key fob is a more complex process that requires special equipment. It is best to have a BMW dealer or a qualified locksmith program a new key fob for you.
