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Changing the Battery in Your Mazda 3 Key Fob

There's nothing more annoying than returning to your car after a long day, and discovering that your key fob battery is dead. Fortunately, it is an easy fix by purchasing an easy battery replacement at an hardware store or a big box retailer.

A spare key fob for your Mazda 3 is an inexpensive way to avoid having to take your vehicle by a dealership to let them re-program the keys.

Battery Replacement

You can replace the battery on your Mazda 3 keyfob at home. But, you should only replace the battery if it goes out of service, or if the key fob displays a message in the multi-information display saying, "Low key fob battery. Replace battery."

You'll need to use a flathead screwdriver, tape and patience to open the case. Insert the flathead screwdriver's head in a notch or gap on the bottom of the metal of the Mazda 3 key fob to cut off the lower half. Repeat this step for the top metal piece however, be careful not to scratch the rubber ring at the bottom of the key fob's case.

There's a slot on each side of the case, which houses the battery. Start on one side of the case, and then gently lift it up. Remove the battery that was used and place in the new CR2025 ensure that it's in the right orientation for the correct orientation. Finally, put the cap on the battery and reattach both sides of the key fob's case. Continue pressing until you can hear them click.

After you've replaced the battery Check the fob to make sure it functions by locking and unlocking your doors. If everything is working then you're able to use your Mazda 3's remote capabilities for the first time!

Pairing Issues

If your key fob has stopped working all of a sudden it could mean that the transmitter in the car has been damaged. It is typically a need for an expert repair and may require a new replacement key fob.

If you have tried replacing the battery and reprogramming the key fob but isn't solving the issue, it is possible that the chip in the key fob may be defective. This could happen if the key fob was dropped on hard surfaces or exposed to salt water, or even touched by dirty hands.

You will need to locate a small "key", which is inserted into the seam to remove the circuit board to identify the problem. You will then be able to check for any damage or corrosion on the electronic chip. It is recommended to use a clean towel to avoid damaging the microchip.

You can also examine the battery connector's terminals to see if they are cracked or broken. If this is the case, then carefully soldering them back in place will usually restore the function of the key fob. You can also examine the buttons for wear or damage. If they are loose, they can be resoldered into position, unless they've physically snapped.

Interference Signals

There's nothing more frustrating than trying to get the engine started in your vehicle and getting the message "No Fob Detected". This can happen at the most inconvenient occasions, such as when you're late for work or have to pick up your children from school/daycare. The good news is that there are steps you can follow to resolve the issue and figure out the root of the problem.

Interference signals can affect the remote key fob's signal to the vehicle making it unable to function properly. This can be caused from objects such as weather conditions, buildings as well as transmitters operating on the same frequency. Interference could occur if your vehicle has aftermarket equipment that transmits at the same frequency as your key fob.

The key fob may also be damaged if exposed to salt water or water. The rubber seals on the electronic chip may be shattered by water, especially when it is submerged for an extended period of time, such as in a pool or at the beach. This can cause the chip to stop functioning and will require replacement of the key fob. If you have a key that has the ability to be programmed, you can clean it using isopropyl or electronic cleaners to restore its functionality. If this doesn't help you can be sure that the chip has fried and requires replacement.

Locking or Unlocking the Doors

The buttons on the key fob send electronic signals to the solenoid inside the car, which converts this signal into mechanical action. This locks and unlocks doors. If your door lock isn't working, it could be an issue with the solenoid. This will require professional repair shops to look into.


A dead 12 volt battery could also stop the fob from functioning properly. This could happen if the battery loses its charge or if your contacts get corrosion-prone. The problem can be addressed in a matter of minutes by replacing the battery.

The receiver module could be the problem if the key fob does not function after replacing the battery or reprogram the device. mazda key fob interprets radio frequency signals transmitted by the key fob to control the vehicle. It could be a costly repair if the device becomes defective.

To verify if this is true, insert your spare key into the key slot. Then turn the ignition ON. Press the key fob twice in 10 seconds, without taking it out. The Mazda 3 system will now be able to synchronize the key with your vehicle and you can then use it as your primary remote for driving. You can program up to three keys this manner.

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