Replacing the key fob battery for a 2015 Mazda CX-5 is a straightforward process that can be done at home with minimal tools. This guide provides step-by-step instructions to help you efficiently change the battery, ensuring that your key fob continues to function properly.

Key Fob Battery Specifications

The key fob for the 2015 Mazda CX-5 uses a CR2025 lithium coin battery. It is essential to have this specific battery type on hand before starting the replacement process.

Tools Needed

To replace the battery, you will need:

  • A CR2025 battery
  • A small flathead screwdriver or a plastic pry tool

Step-by-Step Instructions

1. Remove the Mechanical Key

Locate the small switch on the back of the key fob. Slide it to release the mechanical key and pull it out.

2. Open the Key Fob Case

Insert the flathead screwdriver into the notch where the mechanical key was housed. Gently twist or pry to separate the two halves of the key fob. Be careful not to damage the plastic casing.

3. Remove the Old Battery

Once the fob is open, you will see the battery compartment. Note the orientation of the old battery (the positive side should face up). Use your screwdriver or fingernail to pop out the old battery.

4. Insert the New Battery

Take your new CR2025 battery and insert it into the compartment, ensuring that the positive side is facing up, just as it was with the old battery.

5. Reassemble the Key Fob

Align the two halves of the key fob and press them together firmly until you hear a click, indicating they are securely closed. Finally, reinsert the mechanical key back into its slot.

6. Test Your Key Fob

Stand near your vehicle and test all functions of your key fob, such as locking/unlocking doors and activating any additional features like trunk release or panic alarm.

Maintenance Tips

  • Battery Life: The CR2025 battery typically lasts between 2 to 3 years depending on usage.

  • Signs of Low Battery: If you notice decreased range or intermittent functionality when using your key fob, it’s time for a replacement.

FAQs About Mazda CX-5 Key Fob Battery Replacement

    • How often should I replace my key fob battery?
      Typically every 2-3 years, or when you notice decreased functionality.
    • Can I use a different battery size?
      No, it's important to use a CR2025 battery for proper function.
    • Will changing my key fob battery void my warranty?
      No, replacing the battery yourself does not void any warranty.

By following these steps, you can easily replace your 2015 Mazda CX-5 key fob battery and restore its functionality without needing professional assistance.