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Mazda CX-9 Key Fob Battery Replacement Guide
How to replace the coin cell battery in the switchblade car key fob remote control of a 2007 to 2012 Mazda CX-9 SUV.

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Mazda CX-9 Car Key / Fob
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Release Button Exposed
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Insert Small Screwdriver

This automotive "how-to" guide was specifically written to assist owners of the 2007 to 2012 Mazda CX-9 crossover SUV in replacing the battery in the combination switchblade car key and keyless entry remote control fob.

Owners of other Mazda vehicles such as the MAZDA2, MAZDA3, MAZDA6, MX-5 Miata, RX-8, MAZDASPEED3, MAZDA5, Tribute SUV, and CX-7 crossover may also find this guide to be helpful.

A replacement coin cell, button or "watch" battery for the Mazda CX-9 key fob is a 3 volt # CR1620 available from Panasonic, Duracell, Energizer, Maxell, Rayovac, GE and other manufacturers.

The only tool needed to replace the battery in a Mazda CX-9 switchblade key fob is a small flathead screwdriver.

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Pull Apart Two Halves
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Pry Open Key Fob Remote
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Remote Control Split
The first step is to open the switchblade car key and place the fob on it's side with the key pointing to the right. Then take a close look at Picture 2 on this page to see the release button that needs to be pressed in order to separate the two halves of the fob.

Insert the small flathead screwdriver into the side of the key fob and gently press down on the button before pulling the switchblade key section away from the remote control section.

Next pry apart the two halves of the remote control section by inserting the small flathead screwdriver into the notch shown in Picture 5 above.

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Pry Out Button Battery
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Old Panasonic CR1620 3V
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"+" Polarity Indicator
Pry out the old Panasonic CR1620 3V battery with the small flathead screwdriver. Below the battery, you will see a "+" mark on the plastic to show that the new battery should be installed with the positive side facing down.



 

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Insert New Battery + Down
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Line Up Fob Halves
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Snap Together Key Fob
Push the new CR1620 coin cell battery into the bottom section of the remote control with the "+" side facing the "+" mark molded in the plastic.

Line up the top part of the remote control over the bottom half and gently snap them together.

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Slide In Key To Fob
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Snap Together Parts
Place the switchblade key section and the remote control next to each other with their buttons facing upwards. Slide the tabs on the key section back into the remote control section and push them together until you hear them snap in place.
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Key & Fob Re-Assembled
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Red LED Light Working
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Test New Key Fob Battery
Test the new key fob battery by pushing the lock or unlock button while standing next to your Mazda CX-9. The little red LED light on the key fob and also the car's parking lights should flash.

For more, check out my Mazda CX-9 Repair & Maintenance Guides page.
 

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