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Changing the Battery in Your Mazda 3 Key Fob

There is nothing more frustrating than returning to your car after a long day and realizing that the 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.

Adding a spare key fob to your Mazda 3 can be an cost-effective way to stay away from having to be taken to the dealer and having them reprogram your keys.

Battery Replacement

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

To open the key fob's casing, you'll need a tape-wrapped flathead screwdriver, along with some patience. Insert the head of the flathead screwdriver in a notch or gap on the bottom of the metal of the Mazda 3 key fob to take off the lower portion. Repeat the process for the top piece of metal however, be careful not to damage the rubber ring at the bottom of the case.


You'll find a slot on each side of the fob case that contains the battery. Use the flathead screwdriver with tape to gently open the case, starting on one side before moving to the other. Remove the old battery, and put in the new CR2025 ensure that it's in the right orientation for proper orientation. Install the cap on the battery again, and then attach both sides of your key fob case by pressing until they click.

After replacing the battery, lock and unlock your doors to verify whether the fob is working. If everything looks good the Mazda 3 remote features can be used again.

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If your key fob has stopped working all of a sudden, this could indicate that the transmitter in the car has been damaged. This is usually a matter of an expert to repair it and may require a new key fob.

If you've attempted to replace the battery and reprogram the key fob but it hasn't worked then the chip in the key fob could be faulty. This can occur if the key fob has been dropped on hard surfaces and exposed to salt water or even touched by dirty hands.

To identify the issue, you will need to locate a tiny "key" that is embedded into the seam of the fob which allows you to lift it open and take out the circuit board. You will then be able to examine for any damage or corrosion on the chip. It is recommended to use a clean paper towel to prevent damaging the microchip.

If you're not sure then you should also examine the battery connector's terminals for cracks or breakage. If this is the case, carefully attaching them back can usually restore the function of the key fob. It is also possible to check the buttons for damage or wear. If the buttons are loose they can be soldered back into place, unless one has physically snapped.

Interference Signals

Few things are more annoying than looking at a "No Fob Detected" message when trying to start your car. This usually occurs at the most difficult times, such as when you're late for work or picking up children from school/daycare. There are several things you can do to help figure out what's causing the issue.

Interference signals can interfere with the remote key fob signal coming from the vehicle, causing it to not work correctly. This can be caused by objects such as weather conditions, buildings, and transmitters that operate on the same frequency. Interference may occur if your vehicle has aftermarket equipment that transmits at the same frequency as your key fob.

Additionally, if the key fob is exposed to salt or water waters, it could be damaged. Water can damage the rubber seals of the electronic chip particularly when the key fob is submerged in water for an extended duration. This can cause the chip's function to cease and require replacement of the key fob. If you have a key which can be programmed or programmed, you can clean it with isopropyl and electronic cleaners to restore its functionality. If this doesn't work, it is likely that the chip has fried and must be replaced.

Locking or Unlocking the Doors

The buttons on the key fob send electronic signals to a solenoid in the car that then converts that signal into a mechanical action that locks and unlocks doors. If your door lock doesn't work it could be because of an issue with the solenoid. This requires experts from auto repair shops to examine.

A dead battery of 12 volts can also prevent the fob from functioning properly. This can happen when your battery loses its charge or if the contacts are corroded. This issue can be resolved in minutes with a new battery.

The receiver module could be the problem if the key fob won't work after replacing batteries or reprogram the device. The device interprets radio frequency signals transmitted by the key fob to control the vehicle. If it breaks down it could be costly to fix.

To confirm if this correct, place your spare key in the key slot. Then turn the ignition on. Press the key fob button three times in a matter of 10 seconds without removing it. The Mazda 3 system synchronizes the key with the vehicle, so you can use it as your primary driving remote. This lets you program up to three keys.

Homepage: https://www.autokeys-r-us.co.uk/mazda/