How to Change the Battery in a Mercedes Key Fob

Changing the battery in your Mercedes key fob is a quick and easy process that can save you the hassle of a dead key. This guide will walk you through the steps involved, so you can get back on the road in no time. After reading this, you’ll be equipped to tackle this simple DIY task. Learn how to change the battery in a Mercedes key fob yourself!

Replacing the Battery in a Mercedes Key Fob

Identifying Your Mercedes Key Fob Type

Mercedes uses various key fob designs, and knowing your specific type helps ensure you use the correct battery and procedure. Older models might use a different battery or access method compared to newer, “smart keys”. Identifying the correct key fob type will help you purchase the correct battery and follow the right steps for replacement. Are you working with a traditional key fob or the newer chrome smart key?

Common Mercedes Key Fob Types

• Traditional Key Fob: This type usually has a plastic casing and a flip-out key. The battery compartment is often accessed by sliding a small lever or pressing a release button.
• Chrome Smart Key: This sleeker design often features a chrome finish and may not have a visible key blade. The battery compartment access can vary slightly between models.
• Keyless Go Card: Some Mercedes models utilize a credit card-sized key for entry and starting. These also have batteries that need replacing periodically.

Various Mercedes Key Fobs

What You’ll Need

Before you begin, gather the following:

1. New Battery: CR2025 or CR2032 (check your owner’s manual for your specific model). You can find these at most electronics stores, pharmacies, and online.
2. Small Flathead Screwdriver or Plastic Pry Tool: This is used to gently pry open the key fob casing. Be careful not to scratch the fob’s surface. You can use a small flat blade screwdriver or a dedicated plastic opening tool.

If you’re unsure about the correct battery for your Mercedes key fob, referring to your owner’s manual is the best course of action. It provides precise information specific to your model year and key fob type, eliminating any guesswork. Incorrect battery types could potentially damage your key fob.

Steps to Change the Battery

Here are the general steps for changing the battery in a Mercedes key fob. Remember to consult your owner’s manual for model-specific instructions.

1. Locate the Release Button or Lever: This is usually on the side or back of the key fob. It might be a small button or a sliding switch.
2. Release the Emergency Key: If your key fob has a physical key, release it. This often helps access the battery compartment.
3. Open the Key Fob Casing: Gently insert the flathead screwdriver or plastic pry tool into the slot or notch indicated by the release button or lever. Carefully pry open the casing. Avoid using excessive force, as this can damage the fob.
4. Remove the Old Battery: Once the casing is open, you should see the battery. Gently pry it out using your tool or your fingernail.
5. Install the New Battery: Insert the new battery, making sure the positive (+) side faces up (or as indicated in your owner’s manual).
6. Close the Key Fob Casing: Align the two halves of the casing and press them together until they snap shut.
7. Test the Key Fob: Try locking and unlocking your car to ensure the new battery is working correctly.

Installing a New Battery

Troubleshooting

If your key fob still isn’t working after replacing the battery, there could be other issues. Your key fob may need resynchronization with your car, the car battery might be causing a battery discharge warning car won’t start or a reason for car battery discharge, or other electronic faults. For further diagnostics, consider professional assistance. A dead battery might not always be the issue behind your key not functioning correctly. Sometimes your car battery loses charge overnight. This applies to certain makes and models, such as the Prius battery drains overnight. You can compare your situation with issues regarding your dodge key fob battery.

Conclusion

Changing the battery in your Mercedes key fob is a simple task that most people can handle themselves. By following these steps and referring to your owner’s manual, you can save time and money. Now you know how to change the battery in a Mercedes key fob!

FAQ

1. How often should I change the battery in my Mercedes key fob? Typically, every 2-3 years, depending on usage.
2. What type of battery does my Mercedes key fob use? Most models use a CR2025 or CR2032, but check your owner’s manual to be sure.
3. What if my key fob still doesn’t work after changing the battery? Try resynchronizing the key fob with your car. If that doesn’t work, consult a qualified technician.
4. Can I damage my key fob by changing the battery myself? It’s possible if you use excessive force or the wrong tools. Be gentle and follow the instructions carefully.
5. Where can I buy a replacement battery for my Mercedes key fob? Most electronics stores, pharmacies, and online retailers sell these batteries.
6. Do all Mercedes key fobs have the same battery replacement procedure? No, the process can vary slightly depending on the model and year of your car. Always consult your owner’s manual.
7. Can I use any brand of CR2025 or CR2032 battery? It’s generally recommended to use a reputable brand to ensure quality and longevity.