BMW Vehicle Key Battery Discharged What You Need to Know and How to Fix ItBMW vehicles are known for their advanced technology and luxury features, and one key element of this technology is the vehicle’s remote key. This key allows you to unlock, start, and control various functions of your car from a distance. However, like all electronic devices, the battery in your BMW vehicle key can eventually run out of charge. When this happens, your key may stop functioning, causing frustration and inconvenience. In this topic, we will explore what happens when your BMW key’s battery is discharged, how to identify the issue, and how to replace the battery to restore full functionality.
Understanding the BMW Vehicle Key Battery
BMW’s key fobs are designed to provide ease of access and control over your vehicle. They typically use a small battery, often a CR2032 coin cell, to power the remote functions. This battery allows you to lock and unlock the doors, start the car (with keyless entry), and perform other tasks like opening the trunk or activating the panic alarm.
Over time, however, the battery in the key fob will lose its charge. A discharged battery can cause various issues, from the inability to lock or unlock the car doors remotely to a failure in starting the car using keyless ignition.
Signs That Your BMW Key Battery Is Discharged
It’s essential to recognize the signs of a low or discharged key fob battery early to avoid being locked out of your vehicle or unable to start it. Common indicators of a low key battery include
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Weak Signal or Slow Response If you notice that the remote functions of your key, such as unlocking or locking the doors, take longer than usual to work, it could be a sign that the battery is running low.
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Error Message on the Dashboard BMW vehicles may display an alert or error message on the dashboard indicating that the key fob battery is low or needs to be replaced.
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Inability to Start the Car Some BMW models with keyless entry and ignition may refuse to start if the battery in the key fob is completely discharged.
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Decreased Range If the key fob has a reduced range (you have to be closer to the car for it to work), the battery is likely low and needs replacement.
How to Replace the Battery in Your BMW Key Fob
If your BMW key fob is showing signs of a discharged battery, you can replace it yourself in a few simple steps. Here’s a step-by-step guide on how to replace the key fob battery
1. Get the Right Replacement Battery
Most BMW key fobs use a CR2032 coin cell battery, but it’s essential to verify the exact type required for your specific model. You can check your vehicle’s owner’s manual or look for markings on the back of the key fob to determine the correct battery.
2. Open the Key Fob
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Locate the small slot on the edge of the key fob where you can insert a flathead screwdriver or a coin.
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Pry open the fob carefully, separating the two halves. Be gentle to avoid damaging the casing or internal components.
3. Remove the Old Battery
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Once the fob is open, you’ll see the battery.
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Remove the old battery, taking note of how it is positioned (the positive side usually faces up). You can use a small tool or your fingers to lift the battery out of its compartment.
4. Install the New Battery
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Insert the new CR2032 battery into the key fob, ensuring it is positioned correctly with the positive side facing up.
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Be sure the battery is seated securely and fits snugly in place.
5. Reassemble the Key Fob
- After the new battery is in place, carefully snap the two halves of the key fob back together. Ensure the fob is securely closed with no gaps.
6. Test the Key Fob
- Once reassembled, test the key fob to ensure the remote functions are working correctly. Try locking and unlocking the doors, starting the car, and using other keyless features to confirm the battery replacement was successful.
What to Do if the Key Fob Still Doesn’t Work
In some cases, even after replacing the battery, the key fob may still not function correctly. If this happens, consider the following troubleshooting steps
1. Check the Battery Orientation
Make sure the new battery is inserted correctly. A reversed battery can prevent the key fob from working properly.
2. Ensure the Key Fob Is Programmed Correctly
Some BMW key fobs may need to be reprogrammed if they lose connection with the vehicle’s system. If the key fob doesn’t work after replacing the battery, you might need to visit a BMW dealership or service center to have it reprogrammed.
3. Inspect for Damage
If the key fob has been dropped or exposed to moisture, internal components may be damaged. In this case, the key fob may need to be repaired or replaced.
4. Check for Additional Issues
Sometimes, other problems like a malfunctioning antenna or issues with the car’s receiver system could cause the key fob to stop working. If the key fob continues to fail after battery replacement, seek assistance from a professional technician.
How to Extend the Life of Your BMW Key Fob Battery
To prevent the battery from discharging too quickly, consider the following tips for prolonging the life of your BMW key fob battery
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Avoid Exposure to Extreme Temperatures Avoid leaving your key fob in hot or cold environments, such as inside a car on a sunny day or in freezing weather. Extreme temperatures can drain the battery faster.
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Turn Off Unused Functions Some key fobs have additional features such as panic alarms or remote start. Use them sparingly to reduce battery drain.
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Replace the Battery Early Even if the key fob still works, it’s a good idea to replace the battery every couple of years to prevent sudden failures.
A discharged BMW vehicle key battery can cause inconvenience and prevent you from accessing and starting your vehicle. Recognizing the signs of a low battery and knowing how to replace it yourself can save you time and hassle. By following the steps outlined in this topic, you can ensure that your BMW key fob remains in good working order. If you continue to experience issues after replacing the battery, don’t hesitate to seek professional assistance. Regular maintenance and timely battery replacements will help ensure that your BMW’s key fob always functions smoothly when you need it most.