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Changing the Battery in Your Mazda 3 Key Fob Theres nothing more annoying than getting in your vehicle after a long day and discovering that the key fob battery is dead Luckily its an easy fix with a simple battery replacement from an electronics store or big box retailer A spare key fob for your Mazda 3 is an inexpensive option to not have to be towed to a dealer to have them reprogram your keys Battery Replacement Changing the battery in your Mazda 3 key fob is an easy process that can perform at home But it is best to replace the battery when it fails or when the key fob shows a message on the multiinformation display stating Low key fob battery Replace battery Youll need to use a flathead screwdriver and tape and patience to open the case Find a gap or notch in the bottom portion of the metal of your Mazda 3s key fob and then insert the tip of the screwdriver into it to cut off the lower part Repeat this step for the top metal part Be careful not to damage the rubber ring at bottom of the key fobs case Once the fob case is open youll find the slots on either side of the case that houses the battery Start on the other side of the case and then gently open it Take out the old CR2025 and replace it with a brand new one making sure you place it faceup to ensure the correct polarity Then put the cap on the battery and then reattach both sides of the key fobs case pressing until you can hear them click Now that youve replaced the battery Check the fob to confirm it works by locking and unlocking your doors If everything looks good youre now able to use your Mazda 3s remote features on the road again Pairing Issues This could indicate that the transmitter in your car has been damaged This is usually a matter for a professional and you require a new key fob If you have tried replacing the battery and programming the key fob but did not resolve the issue it is possible that the chip inside the key fob is defective This could happen if the key fob was dropped on hard surfaces and exposed to salt water or even touched by dirty hands To diagnose this issue To determine the cause you must locate a small key located in the seam of the fob that allows you to lift it open and remove the circuit board Then you can check the electronic chip for corrosion or damage To avoid damaging the chip its recommended to clean the chip with a new paper towel It is also possible to examine the battery connectors terminals to determine if theyre cracked or broken If this is the case then carefully connecting them back can usually restore the function of the key fob Also you can check the buttons to see whether theyve been worn out or damaged If the buttons are loose they can be soldered back in the event that the button has actually snapped off Interference Signals Few things are more annoying than staring at a No Fob Detected message when you attempt to start your vehicle This usually occurs at the most awkward time such as when you are late for work or picking up children from schooldaycare The good news is that there are steps you can take to troubleshoot the issue and figure out what is causing it mazda 6 key fob can cause the remote key fob to stop functioning in a proper manner This can be caused by objects such as weather conditions buildings and transmitters that operate on the same frequency Interference could also occur if you have aftermarket equipment installed in your vehicle that transmits on the same frequency as the key fob The key fob can also be damaged if it is exposed to water or salty water The rubber seals on the electronic chip can be penetrated by water especially in the event that it is submerged for an extended period of time such as in the ocean or a pool at the beach This could cause the chip to stop functioning and will require replacement of the key fob If you have a key that can be programmed to work you can clean it with isopropyl and electronic cleaners to bring it back to its original function If this does nothing will be able to fix the issue then the chip has been damaged and will need to be replaced LockingUnlocking of the Doors The buttons on the key fob send electronic signals to a solenoid inside the car that then converts that signal into a mechanical action that locks and unlocks the doors If your door lock fails to work it could be an issue with the solenoid This will require expert auto repair shops to investigate A dead 12 volt could also hinder the fob from functioning effectively This could happen if your battery is not charged or if the contacts become corroded This issue can be resolved within a few minutes using a new battery If the key fob wont work after you replace the battery or reprogram it then the problem may be with the receiver module This device receives radio frequency signals from the key fob and interprets them to control the vehicles functions It can be a costly repair if the device becomes defective To check if this is the case begin by putting your spare key into the key slot and turning the ignition to ON Press the key fob twice within 10 seconds without removing it The Mazda 3 system will now sync the key to the vehicle and you can then use it as your primary remote for driving You can program up to three keys in this way