How to Change a Battery in an MBZ Key Fob

Changing the battery in your Mercedes-Benz key fob is a quick and easy process that can save you time and money. This guide will walk you through How To Change A Battery In An Mbz Key Fob, covering different key fob styles and offering troubleshooting tips.

Understanding Your MBZ Key Fob

Mercedes-Benz has used various key fob designs over the years. Recognizing your key fob type is the first step in replacing the battery. Older models might have a traditional flip key, while newer vehicles often feature the chrome “SmartKey.” Knowing the difference will help you locate the release mechanism and access the battery compartment.

Gathering Your Tools

Before you begin, gather the necessary tools. You’ll need a small flat-head screwdriver or a plastic pry tool to open the key fob, and of course, a new CR2032 battery. It’s also a good idea to have a clean, soft cloth handy to wipe down the key fob and battery contacts.

Step-by-Step Guide: Changing the Battery in a Flip Key

Locate the release button: On the side of your MBZ flip key, you’ll find a small button or switch. Press this button to release the emergency key blade.
Separate the key fob halves: Using the emergency key blade or a small flat-head screwdriver, carefully pry open the key fob casing along the seam. Be gentle to avoid damaging the plastic.
Remove the old battery: The CR2032 battery will be visible inside. Gently pry it out using your screwdriver or pry tool.
Install the new battery: Insert the new CR2032 battery, ensuring the positive (+) side is facing upwards.
Reassemble the key fob: Snap the two halves of the key fob back together. Ensure they click securely into place.
Test the key fob: Try locking and unlocking your vehicle to confirm the new battery is working correctly.

Changing the Battery in a Chrome SmartKey

The process for changing the battery in a chrome SmartKey is slightly different.

Locate the release lever: On the bottom edge of the SmartKey, you’ll find a small release lever. Slide it in the direction indicated on the key fob (usually towards the key ring).
Remove the key blade: Once the lever is slid, the emergency key blade can be pulled out.
Open the battery compartment: Use the emergency key blade or a small flat-head screwdriver to gently pry open the battery compartment cover.
Replace the battery: Remove the old CR2032 battery and insert the new one with the positive (+) side facing upwards.
Reassemble the key fob: Close the battery compartment cover and reinsert the emergency key blade. Ensure everything clicks securely into place.
Test functionality: Check the key fob’s functions by locking and unlocking your car.

Troubleshooting

Key fob still not working? Double-check that the new battery is correctly installed and that it’s a fresh CR2032 battery. Sometimes, new batteries can be faulty.
Key fob needs resynchronizing? After replacing the battery, some key fobs may need to be resynchronized with your vehicle. Consult your owner’s manual for specific instructions on how to do this for your Mercedes-Benz model.

Key Fob Battery Replacement: FAQs

How often should I change my MBZ key fob battery? Typically, a key fob battery lasts between 2-3 years.
What type of battery does my MBZ key fob use? Most MBZ key fobs use a CR2032 battery.

In conclusion, changing a battery in an MBZ key fob is a simple task you can handle yourself. By following these steps and having the right tools, you can save yourself a trip to the dealership and keep your Mercedes-Benz key fob functioning perfectly.

FAQs

Can I use any brand of CR2032 battery?
My key fob is still not working after changing the battery, what should I do?
How do I resynchronize my key fob after replacing the battery?
Where can I buy a CR2032 battery?
Can I damage my key fob by changing the battery myself?
What if I lose the emergency key blade?
How much does it cost to replace a key fob battery at the dealership?

Need more help with your MBZ key fob? Check out our other articles on KEYFOBPROG: “Programming a New MBZ Key Fob” and “Troubleshooting Common MBZ Key Fob Issues”.

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