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Acura MDX Key Fob Battery Replacement Guide
How to change a dead battery in the key fob remote control for a 1st generation 2001 to 2006 Acura MDX SUV.

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2006 MDX Key Fob
Separate Ignition Key
Back Side of Fob
This automotive maintenance tutorial was specifically created to assist owners of the first generation (2001, 2002, 2003, 2004, 2005 & 2006) Acura MDX in changing a weak or dead battery in the key fob remote control for the keyless entry system.

Owners of other Acura or Honda vehicles such as the RDX, ILX, TLX, RLX, TL, CL, RSX, RL, TSX, ZDX, NSX, Integra, Pilot, Accord, Civic, Fit, Clarity, CR-V, CR-Z, HR-V, Odyssey, Element  and Ridgeline may also find these DIY instructions to be helpful.

The compatible replacement coin cell (A.K.A. "button" or "watch") 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.

Notch - Bottom Edge
Pry Apart Two Halves
Circuit Board & Socket
The first step is to separate the key ring and your ignition key from the fob remote control assembly.

Locate the small notch or "slot" on the bottom edge of the fob near the red "Panic" key and the key ring hole.

To prevent from scratching or marring the plastic surfaces, you may choose to either cover the tip of your flathead screwdriver with a thin micro fiber cloth or instead use a small plastic automotive trim panel removal pry bar tool.

Insert the blade of the screwdriver into the the small notch and gently pry apart the two halves of the fob housing.

Once the key fob is disassembled, you'll see the green circuit board on the rear of the front half and the coin cell battery socket in the back half.

Lift Out Old Battery
Old Battery Removed
Panasonic CR 2025 3V
Use your finger nail or the screwdriver to gently pull the old battery out of the socket.

Try to avoid bending or damaging the metal electrical contacts.

The OEM battery was a Panasonic CR2025 3 volt lithium coin battery.


"+" Positive Side Down
Install New Battery
New Battery Installed
If you look closely at the battery holder in the rear cover of the fob, you'll see a small "+" symbol.

Push the new CR2025 battery into the socket with the "+" positive side facing down and the "-" negative side facing up towards you.

Line Up Front & Back
Snap Together Key Fob
Test New Key Fob Battery
Line up the two halves of the fob and gently pop them back together.

Double check that the front and rear cover of the key fob shell are flush together at every edge.

To test the new key fob battery, stand near your SUV 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.

For more, please check out all of my 2001-2006 Acura MDX DIY Repair & Maintenance Guides.

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