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Honda Civic Smart Key Fob Battery Replacement Guide
How to change a dead battery in the smart key fob remote control for a 10th generation 2016 to 2019 Honda Civic.

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2016 Civic Smart Key Fob
Back Side of Key Fob
Small Sliding Switch
This automotive maintenance tutorial was specifically written to assist owners of the tenth generation 2016, 2017, 2018 and 2019 Honda Civic in changing a weak or dead battery in the smart or "intelligent" proximity sensing key fob remote control for the keyless entry system and the push button start system.

Owners of other Honda or Acura vehicles such as the Accord, Insight, Clarity, Fit, HR-V, CR-V, Pilot, Passport, Odyssey, Ridgeline, ILX, MDX, RDX, NSX, RLX and TLX may also find these DIY instructions to be helpful.

The compatible replacement coin cell (also known as a "button" or "watch") battery is part number CR2032 which is available from various manufacturers such as Panasonic, GE, Energizer, Sony and Maxell.

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

The first two steps are to turn over the fob and locate the small plastic switch.


Slide Release Switch
Pull Out Ignition Key
Backup Key Removed
Slide the switch over in the direction of the small arrow printed on it.

Hold the switch in place while pulling the backup / emergency metal ignition key out of its slot in the fob.

Set the ignition key aside in a safe place.

Insert Pry Bar Tool
Pry Apart Two Halves
Gently Separate Edges
Insert the blade of your plastic pry bar tool into the small notch where the metal ignition key used to reside.

Gently loosen the two halves of the fob from each other.

Try to avoid using excessive force to prevent from cracking the plastic housing or damaging the clips.

The rear cover of the fob should pop off relatively easily.

You may need to re-insert the pry bar tool in between the fob assembly and the back cover at several locations to loosen and release all of the retaining clips.

Two Halves Separated
Rear Cover Removed
"+" Positive Side Marking
Set the back cover of the fob aside in a safe place.

You'll notice that there is a "+" positive marking on the rear cover to indicate the battery's correct orientation in the socket.

Old Battery In Socket
Gently Pry Out Old Battery
Old Battery Popped Out
Use your fingernail or a small flathead screwdriver to gently pry out the old battery from the holder at the bottom of the socket (closer to the ignition key slot).

Only pry out the battery at the bottom edge of the fob near the two metal retaining clips that will move out of the way.

Do not pry out the battery closer to the top of the fob (closer to the "Lock") button.

There are two rigid black plastic tabs on the top edge of the socket that will break if you pry at this area.


Remove From Holder
OEM Energizer CR 2032
Empty Battery Socket
Try to avoid bending the metal electrical contacts or scratching the green circuit board.

The OEM (original equipment manufacturer) battery in the fob for this 2016 Civic was an Energizer CR2032 3 volt lithium cell.

Install New Battery
New Battery Installed
Line Up Back Cover
Orientate the new battery with the "+" positive side facing up and the "-" negative side facing down into the socket.

Push the new CR2032 battery into the socket.

Make sure the new battery is fully seated in the holder with the two plastic tabs and two metal retaining clips above the new battery.

You should feel or hear the metal retaining clips "click" securely into place.

Line Up Two Halves
Snap Together Fob
Line Up Backup Key
Line up the rear cover with the remote control housing.

Gently pop the rear cover into place.

Make sure the two halves of the fob are flush with each other at every edge.

Replace Ignition Key
Key Fob Re-Assembled
Test New Key Fob Battery
Slide the metal ignition key straight into its slot until it "clicks" securely into place.

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

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

Be sure to write down the battery change in your vehicle's service records.

Please check out all of my 2016-2019 Honda Civic DIY Repair & Maintenance Guides.

If you found this guide to be helpful, please consider making a small donation by clicking on the "Donate" button located to the right of this paragraph. Thank you!
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