how to change battery in bmw key fob

Tired of your BMW key fob not working? A dead battery could be the culprit. Dealing with a non-functional key fob can be incredibly frustrating for any BMW owner. Fortunately, changing the battery in your BMW key fob is a straightforward process that you can do yourself. In this detailed guide, we’ll cover everything you need to know about how to change the battery in your BMW key fob.

Understanding BMW Key Fob Battery Types

Before we dive into the battery replacement process, it’s important to understand the different battery types used in BMW key fobs. The most common battery types are:

  • CR2450: A large coin cell battery found in many older BMW key fobs.
  • CR2032: A smaller coin cell battery used in BMW Comfort Access key fobs.
  • VL2020: This battery type is used in some BMW “diamond” key fobs, but it’s not designed for easy replacement.

To determine the correct battery type for your BMW key fob, refer to your owner’s manual or look for markings on the existing battery. Getting the right replacement battery is crucial for proper function.

Step-by-Step Guide to Changing BMW Key Fob Battery

For Key Fobs with Replaceable Batteries

If your BMW key fob uses a CR2450 or CR2032 battery, the replacement process is relatively straightforward. Here are the steps:

  1. Remove the key blade: Start by sliding out the metal key blade from the key fob casing.
  2. Pry open the casing: Using a small flathead screwdriver or the key blade itself, locate a small groove or crack along the edge of the casing. Gently pry the casing open at this point.
  3. Remove the old battery: Once the casing is open, you’ll see the old battery. Use the screwdriver or a non-metallic tool to pry it out gently.
  4. Insert the new battery: Make sure the new battery is clean and free of debris. Insert it into the casing with the positive (+) side facing up, following any polarity markings.
  5. Reassemble the key fob: Carefully align the casing pieces and press them together until they snap into place securely.

Pro Tip: While the key fob casing is open, use a clean cloth or compressed air to remove any dust or debris from the interior. This can help prevent potential issues down the line.

For Key Fobs with Built-in Rechargeable Batteries

Some BMW key fobs, particularly older models with a side indent, have built-in rechargeable batteries. In these cases, you cannot easily replace the battery yourself. If the battery stops holding a charge, you’ll likely need to have the entire key fob replaced by a BMW service center.

However, before assuming the worst, try charging the key fob by inserting it into the ignition. If the battery is simply depleted, this may revive it temporarily until you can have it properly replaced.

Model-Specific BMW Key Fob Battery Replacement

While the general process for changing a BMW key fob battery is similar across models, there are some slight variations depending on the specific key fob design. Here are some model-specific instructions:

BMW 1, 3, 5, 7, X3, X5, X6 Series (Comfort Access Keys):

  • These models use the CR2032 battery type.
  • To open the key fob, press the small tab and remove the valet key.
  • Use the valet key or a flathead screwdriver to pry off the battery cover.

BMW “Diamond” Key Fobs:

  • These key fobs use the VL2020 battery, which is not designed for easy replacement.
  • Attempting to open and replace the battery yourself could damage the key fob.
  • It’s recommended to have a BMW service center handle battery replacement for these models.

BMW “Sleek Slant” Key Fobs (F-Series Models):

  • Common in 2011-2017 models like the 3, 5, 7 Series, and X3.
  • Use a CR2032 battery for replacement.
  • Push the button to remove the valet key, then turn the small groove clockwise with the valet key.
  • Use a screwdriver to remove the battery cover and access the old battery.

Tips and Precautions for BMW Key Fob Battery Replacement

While changing a BMW key fob battery is generally a simple task, there are a few important tips and precautions to keep in mind:

  • Handle batteries carefully: Avoid touching the battery contacts with your bare fingers, as oils from your skin can cause corrosion and shorten battery life.
  • Check rubber seals: Inspect the rubber seals in the key fob casing for any cracks or damage that could allow moisture intrusion.
  • Use correct tools: Using the wrong tools or excessive force could damage the key fob casing or internal components. Stick to non-metallic tools or the provided key blade.
  • Consider a professional: If you’re uncomfortable with the process or have a key fob with a built-in rechargeable battery, it’s best to have a BMW service center handle the replacement.

Frequently Asked Questions

How often do BMW key fob batteries need replacement?

The lifespan of a BMW key fob battery can vary depending on usage, but most batteries last between 2-4 years. It’s a good idea to check your key fob regularly and keep a spare battery on hand.

Can I reprogram or reset the key fob after battery change?

In most cases, you won’t need to reprogram or reset your BMW key fob after changing the battery. However, if you’re experiencing any issues with the key fob not functioning properly, consult your owner’s manual or contact a BMW service center for assistance.

What if the new battery doesn’t work in my BMW key fob?

If you’ve correctly installed a new battery but the key fob still isn’t working, there could be an issue with the key fob itself or its programming. In this case, it’s best to have a BMW service center diagnose and potentially replace the key fob.

Ending Thoughts

Dealing with a dead battery in your BMW key fob can be a hassle, but it doesn’t have to be a major ordeal. By following the steps outlined in this guide, you can easily change the battery yourself for most BMW key fob models. Remember to handle the batteries carefully, check for any damage to the key fob casing, and don’t hesitate to seek professional assistance if needed.

Regular battery checks and replacements are essential for ensuring your BMW key fob remains functional and reliable. With a little bit of care and maintenance, you can avoid the frustration of a non-working key fob and keep your BMW running smoothly.

Dylan Matthews, the skilled co-author and technical expert at BMWAutoInsider.com, hails from Savannah, Georgia. His fascination with automobiles, particularly BMWs, was evident from a young age. Dylan holds a Bachelor's degree in Automotive Technology from the University of Northwestern Ohio.
With over 8 years of experience in the BMW service industry, including working alongside Nick Andrews at a prestigious Atlanta dealership, Dylan has developed a deep understanding of these precision German machines. His expertise lies in diagnosing and troubleshooting complex BMW issues.
When not diving into the intricate workings of a BMW, Dylan enjoys tinkering with his project car – a vintage BMW 2002 – and exploring the great outdoors through hiking and camping trips. His meticulous attention to detail and analytical approach make him an invaluable asset to BMWAutoInsider.com's readers.

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