How to Change BMW Key Fob Battery

• Use a small flathead screwdriver to open the BMW key fob
• Remove the old battery, noting its orientation
• Insert a new CR2032 battery, ensuring proper placement
• Close the key fob securely and test its functionality

Why Does Your BMW Key Fob Need a New Battery?

The battery in your BMW key fob powers the signal that unlocks your car, starts the engine, and even allows you to activate other features. Over time, the battery can lose its charge, leading to a reduction in signal strength and causing the key fob to stop working altogether.

Here are some signs that your BMW key fob may need a new battery:

• Weak or no signal: You have to stand close to your car for the key fob to work.
• Unresponsive buttons: The lock, unlock, or start buttons do not work as expected.
• Flickering or dim LED light: If your key fob has an indicator light, it may be faint or not turning on at all.

When you notice these signs, it’s time to replace the battery to keep your key fob functioning properly.

Tools You’ll Need to Change the Battery in Your BMW Key Fob

Before you begin, gather the necessary tools. Luckily, replacing the battery in your BMW key fob is a simple task that doesn’t require much. Here’s what you’ll need:

• Small flathead screwdriver: This tool is necessary for prying open your key fob without damaging it.
• New CR2032 battery: This is the most common battery used in BMW key fobs. You can find it at most electronics stores or online.
• A soft cloth: This will help you clean the key fob as you go and prevent scratches.

With these tools in hand, you’re ready to get started.

Step-by-Step Guide to Changing the Battery in Your BMW Key Fob

Changing the battery in your BMW key fob is a simple process that can be completed in just a few minutes. Follow these easy steps:

Step 1: Open the BMW Key Fob

The first step is to open the key fob. Most BMW key fobs have a small seam where the two halves meet. To open it, gently insert a small flathead screwdriver or plastic pry tool into the seam and carefully twist. Be sure to do this slowly and gently to avoid damaging the plastic.

If your BMW key fob has a metal key inside, you may need to remove it before opening the fob. Slide the metal key out of its slot and set it aside.

Once you’ve worked the screwdriver around the seam, the two halves should separate. Now you have access to the interior of the key fob.

Step 2: Remove the Old Battery

Inside the key fob, you’ll find the battery, which is usually a coin-shaped CR2032 battery. Take note of the battery’s orientation before removing it. The positive (+) side of the battery should be facing up.

Use your fingers or a small tool to gently lift the battery out of the compartment. Be careful not to touch the internal components too much, as dirt or oils from your hands could damage the sensitive parts.

Once you have removed the old battery, dispose of it properly.

Step 3: Insert the New Battery

Now it’s time to insert the new CR2032 battery. Ensure that the positive side (+) is facing up, just like the old battery. Carefully place the new battery into the compartment, ensuring that it sits flat and makes contact with the metal terminals.

It’s essential to install the battery correctly so that the key fob works properly. Double-check that the battery is securely in place before proceeding.

Step 4: Reassemble the Key Fob

With the new battery in place, it’s time to close the key fob. Align the two halves of the fob and gently press them together. You should hear or feel a click when the fob is securely closed.

If your key fob has screws, tighten them to keep everything in place. If not, the two halves should snap back together without any extra effort.

Step 5: Test the Key Fob

The final step is to test your key fob. Stand near your BMW and press the lock or unlock button to see if it responds. If the key fob is working correctly, the signal should be strong, and the buttons should respond immediately.

If the key fob doesn’t work, open it back up and check the battery orientation. Make sure the new battery is inserted correctly, and ensure that the contacts are clean and free of debris.

Troubleshooting: What to Do if the Key Fob Isn’t Working

If your BMW key fob still doesn’t work after you’ve replaced the battery, there are a few things you can check:

1. Check the Battery Orientation

Double-check that the positive side of the battery is facing up. Sometimes, the battery can be inserted the wrong way, causing the key fob to malfunction.

2. Inspect the Contacts

If the metal contacts inside the key fob are dirty or corroded, the battery may not be making a proper connection. Use a soft cloth to clean the contacts gently.

3. Try a Different Battery

It’s possible that the new battery is faulty. Try using another CR2032 battery to see if that solves the problem.

4. Reprogram the Key Fob

In some cases, your key fob may need to be reprogrammed after a battery change. Refer to your vehicle’s owner’s manual or contact a BMW dealership for help with this process.

Maintenance Tips for Your BMW Key Fob

To keep your key fob working well and prevent future issues, here are a few maintenance tips:

• Regularly check the battery: Consider replacing the battery every 1-2 years to avoid unexpected malfunctions.
• Clean the key fob regularly: Dirt and oils can build up, so clean your key fob with a soft cloth from time to time.
• Protect from extreme temperatures: Avoid leaving your key fob in hot or freezing environments, as this can damage the battery and internal components.
• Use a key fob case: A protective case can prevent scratches and other damage to your key fob.

Conclusion

Replacing the battery in your BMW key fob is an easy task that you can do yourself with minimal effort. By following this simple guide, you’ll ensure that your key fob works properly, keeping your BMW secure and convenient to use. Whether you’re replacing a worn-out battery or preventing future problems, knowing how to change the battery in your BMW key fob is a useful skill for every BMW owner.