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Changing the Battery in Your Mazda 3 Key FobIt's a pain to get into your car at the end of a long day and discover that your key fob is dead. Luckily, it's an easy fix by purchasing simple battery replacement from an electronics store or big box retailer.The addition of a spare key fob to your Mazda 3 can be an inexpensive way to save yourself from the hassle of being transported to a dealership and having them reprogram your keys.Battery ReplacementChange the battery in your Mazda 3 key fob is a simple process that you can perform at home. However, you should replace the battery when it is dead, or if the key fob displays a message on the multi-information display stating, "Low key fob battery. Replace battery."To open the key fob's casing it requires a tape-wrapped flathead screwdriver and some patience. Locate a notch or gap in the bottom portion of the metal of the Mazda 3's key fob and then insert the tip of the screwdriver into it to pry off the lower portion. Repeat the process for the top portion of the metal, but be careful not to damage the rubber ring on the bottom of the key fob's case.There's a slot on each side of the fob case that houses the battery. Use the flathead screwdriver with tape to gently pry open the case, beginning on one side and then moving to the other. Remove the battery that was used and place in the new CR2025, making sure that it's in the right orientation for the correct orientation. Put the cap of the battery on again and secure both sides of your key fob case by pressing until they click.Once you've replaced your battery, test the fob to verify that it's working by locking and unlocking your doors. If everything seems to be in good order then your Mazda 3 remote features can be used again.Pairing IssuesThis could be a sign that the transmitter in your car may have been damaged. This is usually a matter of an expert to repair it and will likely need a new key fob.If you have tried replacing the battery and programming the key fob, but isn't solving the issue, it is possible that the chip inside the key fob may be faulty. This can happen when the key fob was dropped on hard surfaces, exposed to salt water or even touched by dirty hands.To determine the cause You will need to find a small "key" that is embedded into the seam of the fob which allows you to open it and take out the circuit board. Then, you can examine the chip for corrosion or damage. It is best to use a clean towel to avoid damaging the microchip.If you're unsure then you should also examine the battery connector's terminals for cracks, or breaks. If this is the case then resoldering the terminals to their original position will usually restore the functionality 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 SignalsThere are few things more frustrating than trying to get the engine started in your vehicle and getting the message "No Fob Detected". This usually occurs at the most awkward time, such as when you are late for work or picking up children from daycare/school. The good news is that there are steps you can take to pinpoint the issue and figure out the root of the problem.Interference signals can disrupt the remote key fob's signal to the vehicle, causing it to not work properly. This could be caused by things like buildings, weather conditions and transmitters that use the same frequency. Interference can occur if your vehicle is equipped with aftermarket equipment that transmits at the same frequency as your key fob.In addition, if the key fob is exposed to salt or water waters, it could be damaged. The rubber seals on the chip's electronic components can be damaged by water, particularly when it is submerged over an extended period of time, such as in the ocean or a pool at the beach. The chip can stop working and require replacement of the keyfob. If you have a key which can be programmed, you can clean it using electronic cleaners or isopropyl to bring it back to its original functionality. If this does not help the chip, it's likely to be damaged and needs to be replaced.new mazda key and Unlocking of DoorsThe buttons on the key fob transmit electronic signals to the solenoid in the car, which transforms this signal into a mechanical action. It locks and unlocks doors. If the door lock isn't working, the issue could be due to a solenoid problem that requires investigation by an expert repair shop for autos.A dead 12 volt battery could also hinder the fob from working effectively. This could happen if the battery is not charged or if your contacts get corrosion-prone. This issue can be solved within a few minutes using a new battery.The receiver module could be the reason why the key fob isn't working after replacing the battery or reprogram the device. The device interprets radio frequency signals received by the key fob to control the vehicle. If it malfunctions it could cost a lot to fix.To determine if this is true, put your spare key into the key slot. Then turn the ignition ON. Press the key fob button two times within 10 seconds without removing it. The Mazda 3 system will now connect the key to the car and you can use it as your primary remote for driving. You can program up to three keys in this way.