If your BMW key fob is acting erratically, such as intermittently failing to lock or unlock your car doors, or if the LED light is dim or not illuminating at all, it’s likely time to change the battery. Replacing the battery in your BMW key fob is a simple and inexpensive task that can be completed in a matter of minutes with just a few basic tools. In this guide, we will provide step-by-step instructions on how to change the battery in your BMW key fob, ensuring that your key fob is functioning properly and your vehicle is secure.
Before you begin, you will need to gather a few tools and materials. These include a small flathead screwdriver or a key fob battery replacement tool, a new CR2032 battery, and a clean, soft cloth. Once you have gathered your tools and materials, you can begin the process of changing the battery in your BMW key fob. First, use the small flathead screwdriver or key fob battery replacement tool to gently pry open the back of the key fob. Be careful not to damage the key fob or the battery inside. Once the back of the key fob is open, you will see the old battery. Use your finger or a pair of tweezers to carefully remove the old battery and dispose of it properly.
Locating the Key Fob Battery
BMW key fobs employ a variety of battery types depending on the model and year of the vehicle. The most common battery types used are CR2032, CR2450, and CR2025. Regardless of the specific battery type, locating it requires a systematic approach to ensure efficiency and prevent damage to the key fob.
Identifying the Key Fob Battery Type
The first step is to identify the type of battery used in the key fob. Refer to your vehicle’s owner’s manual or consult a reputable online source to determine the correct battery type. Having the correct battery on hand before starting the process will save time and ensure a successful outcome.
Locating the Battery Compartment
Once the battery type has been identified, locate the battery compartment on the key fob. This is typically a small, hinged or snap-on cover located on the back or side of the fob. Gently pry open the compartment using a small flat-head screwdriver or a coin.
Accessing the Battery
In most cases, the battery will be easily accessible once the compartment is open. However, some key fobs may require additional steps, such as removing a small screw or prying out a plastic retaining clip. Handle these components with care to avoid damaging the fob’s internal electronics.
Battery Types and Locations in Common BMW Key Fobs:
| Model | Battery Type | Battery Location |
|---|---|---|
| E39 (1997-2003) | CR2032 | Back of key fob, under hinged cover |
| E46 (1999-2006) | CR2450 | Bottom of key fob, under snap-on cover |
| E90 (2005-2012) | CR2025 | Back of key fob, under hinged cover |
| G30 (2017-Present) | CR2032 | Inside key fob, under battery cover |
Preparing for Battery Replacement
Before embarking on the battery replacement process, it is crucial to gather the necessary tools and materials. You will need:
- A new CR2032 button battery
- A small flathead screwdriver or a key
- A clean cloth
Steps to Open the Key Fob
1. Locate the small notch or seam on the side of the key fob.
2. Carefully insert the flathead screwdriver or key into the notch and gently pry the two halves of the fob apart.
3. Avoid using excessive force to prevent damaging the fob’s casing.
Detailed Guide for Battery Removal and Replacement
1. Once the key fob is open, you will see the old battery secured in a small compartment.
2. Use your fingernail or a small tool to gently remove the old battery by lifting it out of its socket.
3. Note the orientation of the old battery and ensure the new battery is inserted in the same direction.
4. Place the new CR2032 battery into the compartment, ensuring the positive (+) side of the battery is facing upwards.
5. Gently press the battery down to secure it in place.
| CR2032 Button Battery | |
|---|---|
| Voltage: | 3V |
| Diameter: | 20mm |
| Thickness: | 3.2mm |
| Typical Capacity: | 220mAh |
Removing the Old Battery
1. **Locate the battery compartment.** The battery compartment is usually located on the back of the key fob. It may be covered by a small rubber or plastic cover.
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Remove the cover. Use a small screwdriver or your fingernail to pry off the cover.
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Remove the old battery. Once the cover is removed, you will see the old battery. Use a small screwdriver or your fingernail to pry out the battery. Be careful not to damage the battery or the key fob.
–Note: The battery size for most BMW key fobs is CR2032 or CR2450. Here is a table of common BMW key fob battery sizes:
BMW Key Fob Model Battery Size E39 5 Series CR2025 E46 3 Series CR1620 E53 X5 CR2450 E60 5 Series CR2032 E65 7 Series CR2450 E70 X5 CR2032 E71 X6 CR2032 E83 X3 CR1620 E84 X1 CR2032 E89 Z4 CR2450 F01 7 Series CR2032 F02 7 Series CR2032 F06 6 Series CR2032 F07 5 Series CR2032 F10 5 Series CR2032 F11 5 Series CR2032 F12 6 Series CR2032 F13 6 Series CR2032 F15 X5 CR2032 F16 X6 CR2032 F20 1 Series CR2025 F21 1 Series CR2025 F22 2 Series CR2025 F23 2 Series CR2025 F25 X3 CR2032 F26 X4 CR2032 F30 3 Series CR2032 F31 3 Series CR2032 F32 4 Series CR2032 F33 4 Series CR2032 F34 3 Series CR2032 F35 3 Series CR2032 F36 4 Series CR2032 F37 4 Series CR2032 F45 2 Series CR2025 F46 2 Series CR2025 F48 X1 CR2032 F49 X2 CR2032 F52 Mini CR2032 F54 Mini CR2032 F55 Mini CR2032 F56 Mini CR2032 F57 Mini CR2032 F60 Countryman CR2032 F65 X4 CR2032 F70 X6 CR2032 F80 M3 CR2032 F82 M4 CR2032 F85 X5 M CR2032 F86 X6 M CR2032 F87 M2 CR2032 F90 5 Series CR2032 F91 5 Series CR2032 F92 8 Series CR2032 F93 8 Series CR2032 F95 X5 CR2032 F96 X6 CR2032 G01 X3 CR2032 G02 X4 CR2032 G05 X5 CR2032 G06 X6 CR2032 G07 X7 CR2032 G11 7 Series CR2032 G12 7 Series CR2032 G14 8 Series CR2032 G15 8 Series CR2032 G16 8 Series CR2032 G20 3 Series CR2032 G21 3 Series CR2032 G22 4 Series CR2032 G23 4 Series CR2032 G24 4 Series CR2032 G26 4 Series CR2032 G28 X3 CR2032 G29 X4 CR2032 G30 5 Series CR2032 Securing the Battery
To secure the battery in place, follow these detailed steps:
- Locate the small clip on the side of the battery holder. Gently push the clip inward to release the battery.
- Carefully lift the battery out of the holder. Do not touch the metal contacts on the battery with your bare hands as it can affect the battery’s performance.
- Inspect the battery contacts for any corrosion or damage. If any corrosion is present, use a soft cloth to clean the contacts.
- Insert the new battery into the holder, ensuring that the positive (+) terminal faces upward. Make sure the battery is securely seated in the holder.
- Secure the battery by pushing the clip back into place to lock the battery in position. Double-check that the battery is firmly held in place and will not come loose during normal use.
Key Fob Battery Type BMW 3 Series (2019-2023) CR2032 BMW 5 Series (2017-2023) CR2025 BMW X5 (2019-2023) CR2032 Testing the Key Fob
Confirm that your BMW key fob battery needs to be replaced by performing a quick test. Press the lock or unlock button on the fob and observe the LED light. If the light does not flash or appears dim, it may indicate a weak battery.
Another way to test the battery is by using a multimeter. Set the multimeter to measure voltage and touch the probes to the positive and negative terminals on the key fob battery. A reading between 3.0 and 3.3 volts indicates a good battery, while a reading below 2.7 volts suggests the battery needs to be replaced.
If the key fob is not functioning properly, such as failing to unlock or lock the vehicle, it is advisable to test the battery, even if the LED light appears normal. You can also try replacing the battery with a new one to determine if it resolves the issue.
Before proceeding with the battery replacement, ensure you have the correct replacement battery type recommended for your BMW model. Refer to your vehicle’s owner’s manual or consult with a BMW dealership for specific battery requirements.
Using a Multimeter to Test the Battery
Step Instruction 1 Set the multimeter to measure voltage. 2 Touch the red probe to the positive terminal of the battery and the black probe to the negative terminal. 3 Observe the voltage reading on the multimeter display. Battery Safety
When handling spent batteries, it is essential to follow proper safety precautions to avoid potential hazards. Always wear gloves when working with batteries, as they can contain harmful chemicals that can irritate skin. Also, never dispose of batteries in regular household trash, as they can leach harmful substances into the environment. Instead, recycle or dispose of them at designated battery collection points.
Handling Spent Batteries
Spent batteries should be handled with care to prevent environmental contamination and potential health hazards. Here are some guidelines for handling spent batteries responsibly:
1. Remove Batteries Safely
Before handling spent batteries, remove them from their devices and ensure they are not still connected to any electrical source. Use insulated tools or gloves to prevent accidental contact with terminals.
2. Identify Battery Type
Identify the type of battery being handled (e.g., lithium-ion, alkaline, button cell). Different battery types require different disposal methods, so it is crucial to determine the correct disposal route.
3. Store Batteries Securely
Store spent batteries temporarily in a safe and secure location, away from children and pets. Ensure the batteries are kept dry and at room temperature to prevent any potential reactions.
4. Recycle or Dispose Properly
Dispose of spent batteries responsibly by recycling them at designated collection points or following local regulations for battery disposal. Do not dispose of batteries in regular household trash as they can leach harmful substances into the environment.
5. Avoid Mixing Battery Types
When storing or recycling batteries, do not mix different battery types together. Incompatible batteries can react and cause potential hazards, so keep them separate during disposal.
6. Use Proper Disposal Containers
Use designated battery disposal containers or recycling bins to ensure batteries are disposed of safely and securely. Avoid using containers made of conductive materials that could cause short circuits or other hazards.
7. Follow Local Regulations
Be aware of and adhere to local regulations regarding battery disposal in your area. Contact your local waste management authority or environmental protection agency for detailed instructions and designated disposal points.
Troubleshooting Common Issues
The Fob Is Not Working
If the fob is not working, it could be due to a number of reasons. First, check to see if the battery is low. If the battery is low, replace it with a new one. If the battery is not the issue, try resetting the fob. To reset the fob, press and hold the lock and unlock buttons for 10 seconds. Then, release the buttons and press the lock button again. If the fob still does not work, there may be a problem with the fob itself. In this case, you will need to take the fob to a BMW dealer to have it repaired or replaced.
The Fob Is Not Unlocking the Doors
If the fob is not unlocking the doors, it could be due to a number of reasons. First, check to see if the fob is out of range. The fob has a range of about 30 feet. If you are too far away from the car, the fob will not be able to unlock the doors. Second, check to see if the car is in valet mode. Valet mode disables the fob from unlocking the doors. To turn off valet mode, insert the key into the ignition and turn it to the “on” position. Then, press and hold the lock button on the fob for 10 seconds. Finally, check to see if the car’s battery is dead. If the car’s battery is dead, the fob will not be able to unlock the doors.
The Fob Is Not Locking the Doors
If the fob is not locking the doors, it could be due to a number of reasons. First, check to see if the fob is out of range. The fob has a range of about 30 feet. If you are too far away from the car, the fob will not be able to lock the doors. Second, check to see if the car is in valet mode. Valet mode disables the fob from locking the doors. To turn off valet mode, insert the key into the ignition and turn it to the “on” position. Then, press and hold the lock button on the fob for 10 seconds. Finally, check to see if the car’s battery is dead. If the car’s battery is dead, the fob will not be able to lock the doors.
Maintaining Key Fob Battery Life
To extend the lifespan of your BMW key fob battery, consider the following tips:
Avoid Extreme Temperatures: Extreme heat or cold can damage the battery. Store the key fob in a moderate temperature range.
Limit Button Pressing: Avoid pressing the key fob buttons excessively, as this drains the battery faster.
Use Both Keys Regularly: If you have multiple key fobs for your BMW, use them alternately to distribute battery usage.
Clean the Battery Contacts: Corrosion and dirt on the battery contacts can interfere with conductivity. Clean the contacts regularly with a cotton swab and rubbing alcohol.
Check for Water Damage: Water can damage the battery. Avoid submerging the key fob or exposing it to excessive moisture.
Replace the Battery Cover: Ensure that the battery cover is tightly closed to prevent moisture or dust from entering.
Avoid Metal Contact: Avoid storing the key fob near other metal objects, such as coins or keys, as they can cause short circuits.
Consider a Refurbished Battery: If the key fob battery fails frequently, consider replacing it with a refurbished battery, which may have a longer lifespan.
Monitor Battery Health: Check the key fob’s battery health regularly. Some BMW models have a battery indicator on the dashboard or key fob display.
How to Change BMW Key Fob Battery
Replacing the battery in your BMW key fob is a simple task that can be completed in a few minutes. Here are the steps:
- Locate the small slot on the back of the key fob.
- Insert a small flathead screwdriver or key into the slot and gently pry the key fob open.
- Remove the old battery from the key fob and insert the new battery, making sure that the positive (+) side of the battery is facing up.
- Snap the key fob back together.
People Also Ask About How to Change BMW Key Fob Battery
How do you know when the battery in your BMW key fob needs to be replaced?
There are a few signs that the battery in your BMW key fob needs to be replaced, including:
- The key fob does not work as far away from the car as it used to.
- The key fob does not work intermittently.
- The key fob does not work at all.
What type of battery does my BMW key fob use?
BMW key fobs use a CR2032 battery. This is a small, round battery that is commonly used in watches and other electronic devices.
How often should I replace the battery in my BMW key fob?
The battery in your BMW key fob should be replaced every 2-3 years, or more often if you use your key fob frequently.
