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Mazda Mazda6 Key Fob Battery Replacement Guide
How to change the battery in the advanced key fob remote control for a 3rd generation 2014 to 2018 Mazda 6 sedan.

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2016 Mazda6 Key Fob
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Back Side of Fob
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Slide Switch - Release Key

This automotive maintenance tutorial was specifically written to assist owners of the third generation (2014, 2015, 2016, 2017 and 2018) Mazda Mazda6 sedan in changing a dead battery in the advanced (A.K.A. "smart" or "intelligent") key fob remote control for the keyless entry and push button start systems.

Owners of other Mazda vehicles such as the Mazda2, Mazda3, Mazda5, CX-3, CX-5, CX-7, CX-9, and the MX-5 Miata may also find these DIY instructions to be helpful.

The compatible replacement coin cell (also know as a "watch" or "button") battery is part number CR2025 which is available from various manufacturers such as Panasonic, Sony, Energizer, Duracell and Maxell.

The only tool needed to access and replace the battery is a small flathead screwdriver or a small plastic pry bar tool.

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Pry Apart Two Halves
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Back Cover Removed
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Pry Open Battery Cover
The first step is to turn over the fob and locate the plastic switch.

Slide the switch to release the backup / emergency metal ignition key from the fob.

Remove the metal ignition key and set it aside in a safe place.

Insert the small flathead screwdriver or a thin plastic pry bar tool in to the side of the fob in between the two halves.

Gently pry off the rear cover of the fob.

Then use the screwdriver to gently pry off the round black plastic battery cap.

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Old Battery Exposed
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Gently Remove Old Battery
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Old Battery Removed
Either turn over the fob and gently tap out the old CR2025 battery or remove it with the blade of the small flathead screwdriver.

Try to avoid bending the metal electrical contacts or scratching the green circuit board.



 

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Panasonic CR 2025 3V
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Install New Battery
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Push On Plastic Cap
Insert the new CR2025 3 volt battery in to the socket with the "+" positive side facing up and the "-" negative side facing down.

Make sure that the new battery is securely seated in the holder.

Push the plastic battery cap back in to place.

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Battery Cover Replaced
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Snap Together Two Halves
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Key Fob Flush Together
Line up the back cover with the other half of the fob and gently pop them back together.

Make sure that the two halves of the fob are flush together at every edge.

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Slide In Ignition Key
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Key Fob Re-Assembled
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Test New Key Fob Battery
Slide the metal ignition key back in to its slot.

To test the new battery, stand near your car and press the "Unlock" or "Lock" buttons.

If the new battery is working properly, the parking lights should flash and you'll also hear the door locks opening or closing.

For more, check out my other 2014-2018 Mazda Mazda6 DIY Repair & Maintenance Guides.
 

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