Maintaining a functional BMW key fob is essential for the seamless operation of your vehicle. Over time, the battery within the fob can deplete, interrupting its performance and leaving you stranded. Fortunately, replacing the battery is a simple and straightforward process that you can undertake yourself with minimal effort. In this comprehensive guide, we will delve into the step-by-step instructions for changing the battery in a BMW key fob, empowering you to restore its functionality efficiently.
Before embarking on this task, gather the necessary materials. You will require a new CR2032 coin-shaped battery and a small flathead screwdriver or a dedicated key fob battery replacement tool. With these tools at hand, you can proceed with the battery replacement process. Firstly, locate the small release button on the side of the key fob. Depress this button and simultaneously pull the two halves of the fob apart. Gently pry open the fob, taking care not to damage the internal components.
Once the fob is open, you will notice the exposed battery compartment. Carefully remove the old battery, ensuring proper disposal. Position the new CR2032 battery in the compartment, aligning it correctly with the positive (+) and negative (-) terminals. Press down gently to secure the battery in place. Reassemble the key fob by snapping the two halves together. Finally, test the fob’s functionality by pressing the buttons. If the fob operates as intended, you have successfully replaced the battery. Remember to dispose of the old battery responsibly at an appropriate recycling facility.
Identifying the Type of Battery in Your BMW Key Fob
Knowing the type of battery in your BMW key fob is crucial before attempting a replacement. To determine the battery type, you can refer to the following options:
Refer to the Key Fob Manual
Consult the owner’s manual or other documentation provided with your BMW vehicle. Typically, the battery type will be specified in the section dedicated to key fob information.
Inspect the Battery Physically
Carefully remove the key fob cover and locate the battery. The battery’s size and shape will give you an indication of its type. Common battery sizes include CR2032, CR2025, and CR2016. You can also check for any markings or codes printed on the battery itself.
Use a Battery Tester
If you have a multimeter or battery tester, you can measure the voltage of the battery to determine its type. Refer to the battery’s voltage rating (typically 3V or 1.5V) to identify the correct battery type.
| Battery Type | Voltage |
|---|---|
| CR2032 | 3V |
| CR2025 | 3V |
| CR2016 | 3V |
Removing the Key Fob Battery Tray
To replace the battery, it’s essential to first remove the battery tray from the key fob. Here’s a detailed guide to help you do just that:
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Locate the Battery Tray Release Button: Most BMW key fobs feature a dedicated battery tray release button on the back or side. Look for a small, recessed button or lever that you can press.
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Press the Release Button: Gently press the battery tray release button. You may need to use a small tool like a screwdriver or a key to press the button firmly.
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Extract the Battery Tray: Once the button is pressed, the battery tray should pop out slightly. Use your fingers to carefully pull the tray out of the key fob.
Note: Some BMW key fobs may have different battery tray designs. If you don’t find a dedicated release button, refer to your vehicle’s owner’s manual or consult a professional.
Replacing the Battery
BMW key fobs are powered by a small, coin-shaped battery that typically lasts for several years. However, over time, the battery may start to lose its charge and will need to be replaced. Replacing the battery in a BMW key fob is a relatively simple process that can be done in a few minutes.
Step 1: Remove the Key Blade
Before you can access the battery, you will need to remove the key blade from the key fob. This can be done by pressing the small button on the side of the key fob and pulling the key blade out.
Step 2: Open the Key Fob
Once the key blade has been removed, you will need to open the key fob. This can be done by inserting a small, flat-head screwdriver into the seam between the two halves of the key fob and prying them apart.
Step 3: Locate the Battery
Once the key fob has been opened, you will need to locate the battery. The battery is typically held in place by a small metal clip. To remove the battery, simply use a small screwdriver to pry the clip open.
| Battery Type | BMW Key Fob Model |
|---|---|
| CR2032 | E39, E46, E53, E60, E61, E63, E64, E65, E66, E70, E71, E72, E83, E84, E85, E86, E87, E88, E89, E90, E91, E92, E93, F01, F02, F03, F04, F06, F07, F08, F10, F11, F12, F13, F15, F16, F18, F20, F21, F22, F23, F25, F26, F30, F31, F32, F33, F34, F35, G01, G02, G05, G06, G07, G11, G12, G14, G15, G16, G20, G21, G22, G23, G29, G30, G31, G32, H62 |
| CR2450 | E38, E65, E66 |
| CR2025 | E34, E36, E38, E39, E46, E53 |
Step 4: Replace the Battery
Once the battery has been removed, you can replace it with a new one. Make sure that the new battery is the same type as the old one. To install the new battery, simply insert it into the slot in the key fob and press down on the metal clip to secure it in place.
Step 5: Close the Key Fob
Once the new battery has been installed, you can close the key fob by snapping the two halves together. Make sure that the key blade is properly aligned before you insert it back into the key fob.
Step 6: Test the Key Fob
Once the key fob has been closed, you should test it to make sure that it is working properly. Press the buttons on the key fob to make sure that they are working and that the key fob is communicating with the car. If the key fob is not working properly, you may need to replace the battery again or contact a BMW dealer for assistance.
Reattaching the Battery Tray
Once you have replaced the battery, it’s time to reattach the battery tray. Here’s a detailed guide on doing so:
| Steps | Details |
|---|---|
| 1. | Locate the two small screws that hold the battery tray in place. |
| 2. | Use the screwdriver or hex key to loosen the screws. Do not remove them completely. |
| 3. | Carefully lift the battery tray slightly to create a small gap. |
| 4. | Gently slide the battery tray back into its original position, ensuring that the battery terminals align correctly. Make sure the key fob components fit snugly together without any gaps or misalignment. |
| 5. | Tighten the screws securely but avoid overtightening. |
| 6. | Check if the battery tray is securely attached and that the key fob operates properly. |
Preparing the Replacement Battery
Before starting, gather a CR2032 battery (Check the battery type specific to your key fob model). You’ll also need a small flathead screwdriver or a key fob opening tool.
Opening the Key Fob
Insert the flathead screwdriver or opening tool into the small notch or crevice on the key fob’s housing. Gently twist or pry open the fob, taking care not to damage any components.
Removing the Old Battery
Locate the existing battery inside the key fob. It will usually be secured in a small compartment or clip. Use the flathead screwdriver or your fingers to carefully pry out the old battery. Dispose of it properly.
Inserting the New Battery
Orient the new CR2032 battery correctly in the compartment. Ensure the positive (+) side of the battery faces upwards. Firmly press the battery into place until it clicks or settles securely.
Reprogramming the Key Fob (if necessary)
BMW models from 2005 onwards (E Series and F Series):
- Insert the new battery into the key fob.
- Get inside your BMW and close all doors.
- Insert the key fob into the ignition and turn it to the "ON" position (do not start the engine).
- Wait 10 seconds, then turn the key fob to the "OFF" position and remove it from the ignition.
- Press and hold the unlock button on the key fob for 30 seconds. Keep the button pressed even if the doors unlock.
- Release the unlock button and immediately press the lock button for 30 seconds. As the lock button is held, the doors will lock, unlock, and then re-lock.
- The key fob is now reprogrammed. Test it by locking and unlocking the car from a distance.
BMW models from 2001 – 2004 (E46 and E39):
- Insert the new battery into the key fob.
- Get inside your BMW and close all doors.
- Insert the key fob into the ignition and turn it to the "ON" position (do not start the engine).
- Wait 10 seconds, then turn the key fob to the "OFF" position and remove it from the ignition.
- Press and hold the unlock button on the key fob for 30 seconds. Keep the button pressed even if the doors unlock.
Troubleshooting Common Battery Problems
If your BMW key fob is not functioning properly, the battery may need to be replaced. Here are some additional tips for troubleshooting common battery problems:
1. Check the battery contacts. Make sure that the battery contacts are clean and free of any corrosion. If the contacts are dirty, you can clean them with a cotton swab dipped in rubbing alcohol.
2. Test the battery with a multimeter. A multimeter is a device that can measure the voltage of a battery. To test the battery in your key fob, set the multimeter to the voltage setting and touch the probes to the positive and negative terminals of the battery. The multimeter should read around 3 volts. If the battery is reading below 3 volts, it needs to be replaced.
3. Try a new battery. If you have checked the battery contacts and tested the battery with a multimeter and the battery is still not working, it may be time to try a new battery. Be sure to use the correct type of battery for your key fob.
4. Check the key fob’s circuit board. If you have tried a new battery and the key fob is still not working, the problem may be with the key fob’s circuit board. You can check the circuit board for any loose connections or broken components. If you find any problems with the circuit board, you may need to replace the key fob.
5. Have the key fob diagnosed by a BMW dealer. If you have tried all of the above troubleshooting tips and the key fob is still not working, you can have the key fob diagnosed by a BMW dealer. The dealer will be able to determine the cause of the problem and recommend the best course of action.
6. Replace the key fob. If the key fob is damaged or the circuit board is not repairable, you will need to replace the key fob. You can purchase a new key fob from a BMW dealer or online. Be sure to program the new key fob to your vehicle before using it.
How to Change the Battery in a BMW Key Fob
1. Materials Required
Replacement battery (CR2032 or CR2450), small screwdriver
2. Remove the Key Fob Cover
Locate the small notch or lever on the side of the key fob. Insert the screwdriver and gently pry the cover apart.
3. Remove the Old Battery
Carefully lift the old battery out of its compartment using the screwdriver or your finger.
4. Insert the New Battery
Place the new battery in the compartment with the positive (+) side facing up.
5. Replace the Key Fob Cover
Align the cover with the base of the key fob and gently press it back into place until it snaps closed.
6. Test the Key Fob
Press the buttons on the key fob to ensure it is working properly.
7. Tips for Extending Battery Life
Minimize Button Presses
Avoid using the key fob excessively. Only press the buttons when necessary.
Avoid Extreme Temperatures
Extreme heat or cold can shorten battery life. Store the key fob in a cool, dry place.
Clean the Key Fob
Dirt and debris can accumulate on the key fob, interfering with its functionality and battery life. Clean it regularly with a damp cloth.
Replace the Battery Promptly
When the battery starts to weaken, replace it promptly to avoid complete battery failure.
Use a Case or Sleeve
Protective cases or sleeves can prevent damage to the key fob, extending its battery life.
Consider a Spare Key Fob
Having a spare key fob ensures that you always have a backup in case of battery failure.
Battery Replacement Intervals
The battery lifespan depends on usage. Typically, BMW key fob batteries last for 2-5 years.
| Battery Type | Approximate Lifespan |
|---|---|
| CR2032 | 2-3 years |
| CR2450 | 4-5 years |
Safety Precautions When Changing the Battery
Before you begin, there are a few safety precautions you should take:
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Make sure that the key fob is not in use and that the vehicle is turned off.
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Avoid touching the electrical contacts on the battery or the key fob.
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Do not use a metal object to pry open the key fob, as this could damage the fob or the battery.
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Dispose of the old battery properly according to your local regulations.
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If you are not comfortable changing the battery yourself, please take it to a qualified technician.
8. Test the Key Fob
Once you have replaced the battery, it is important to test the key fob to make sure that it is working properly. To do this, simply press one of the buttons on the fob and hold it for a few seconds. If the LED light on the fob comes on, then the fob is working properly.
If the LED light does not come on, then there may be a problem with the fob or the battery. In this case, you should try replacing the battery again. If the problem persists, then you should take the fob to a qualified technician for repair.
| Symptom | Possible Cause | Solution |
|—|—|—|
| LED light does not come on | Dead battery | Replace the battery |
| LED light flashes rapidly | Faulty fob | Replace the fob |
| Button does not work | Dirty contacts | Clean the contacts with a cotton swab and rubbing alcohol |
Benefits of Changing the Battery Regularly
Regularly changing the battery in your BMW key fob offers several advantages, including:
- Enhanced Performance: A fresh battery ensures optimal functionality of the key fob, enabling you to effortlessly lock, unlock, and start your vehicle.
- Extended Lifespan: Battery replacement prevents premature deterioration of the key fob, prolonging its lifespan and saving you the hassle of purchasing a new one.
- Increased Reliability: A reliable battery guarantees trouble-free operation of the key fob, eliminating the frustration of malfunctioning keys at inconvenient moments.
- Improved Safety: A working battery ensures that your key fob can securely transmit signals to your vehicle, preventing unauthorized access and enhancing your safety.
Detailed Battery Replacement Instructions
9. Reassemble the Key Fob
To properly reassemble the key fob, align the key blade with the fob and insert it into the corresponding slot. Ensure that the blade is securely seated. Replace the back cover and gently press down on all sides until it snaps into place. Avoid applying excessive force that could damage the fob.
Note: If you encounter any difficulties during the battery replacement process, refer to your BMW owner’s manual or seek assistance from a qualified mechanic.
| Recommended Battery Types |
|---|
| CR2032 |
| CR2025 |
| CR2016 |
Materials Needed
Before beginning, gather the following materials:
- New CR2032 battery
- Small flathead screwdriver
- Optional: Key fob cover
Additional Considerations for Different BMW Models
The specific steps for changing the battery in a BMW key fob may vary slightly depending on the model of your BMW. Here are some additional considerations:
BMWs with Proximity Keys
If your BMW has proximity keys, you will need to remove the physical key from the key fob before changing the battery. To do this, press the button on the back of the key fob and slide the key out.
BMWs with Keyless Entry
If your BMW has keyless entry, you will not need to remove the physical key from the key fob. You can simply follow the steps outlined in the main instructions to change the battery.
BMWs with Display Key
BMWs with display keys have a built-in battery that cannot be changed by the user. If the battery in your display key is low, you will need to take it to a BMW dealership to have it replaced.
BMWs with Comfort Access
BMWs with Comfort Access allow you to unlock and start your car without removing the key fob from your pocket or purse. If the battery in your Comfort Access key fob is low, you will still be able to unlock and start your car, but you will need to hold the key fob closer to the door handle or steering wheel.
How to Change the Battery in a BMW Key Fob
It is a simple task that can be completed in a few minutes. To change the battery in a BMW key fob, you will need a small flathead screwdriver or a key fob battery replacement tool. Here are the steps on how to do it:
- Locate the small screw on the back of the key fob and remove it using the screwdriver.
- Open the key fob by gently prying it apart with the screwdriver or your fingers.
- Locate the old battery and remove it by gently prying it out with the screwdriver.
- Insert the new battery into the key fob, positive side up.
- Close the key fob and replace the screw.
People Also Ask About How to Change the Battery in a BMW Key Fob
What type of battery does a BMW key fob use?
BMW key fobs typically use a CR2032 coin battery.
How often should I change the battery in my BMW key fob?
The battery in a BMW key fob should be changed every 2-3 years, or more frequently if you use the key fob frequently.
Can I change the battery in my BMW key fob myself?
Yes, it is a simple task that can be completed in a few minutes. See the steps above for instructions.
