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Changing the Battery in Your Mazda 3 Key Fob Its a pain to drive off at the end of a long workday and discover that the key fob is dead This is a simple fix that can be found at a big box retailer or hardware store A spare key fob for your Mazda 3 is an inexpensive alternative to not having to take your vehicle by a dealership to let them reprogram your keys Battery Replacement You can change the battery on your Mazda 3 keyfob at home It is recommended to replace it if the battery is dead or you see a message saying Low keyfob battery on the multiinformation display Replace battery Youll need to use an flathead screwdriver along with tape and patience to open the case Find a gap or notch in the bottom metal part of your Mazda 3s key fob and then insert the head of the screwdriver into it to remove the lower part Repeat the process for the top metal piece but be sure not to scratch the rubber ring that is on the bottom of the case Theres a slot on each side of the case that contains the battery Start on the other side of the case and then gently pry it open Remove the old CR2025 and replace it with a brand new one making sure that you place it faceup to ensure the correct the polarity Finally put the battery cap back on and reattach both sides to the key fob case pressing until you hear them click After replacing the battery test the fob to make sure it is working by locking and unlocking your doors If everything is working then you can begin using the Mazda 3s remote functions in the road Pairing Issues This could indicate that the transmitter in your car is damaged This is usually a matter of an expert repair and will likely need a new key fob If you have tried replacing the battery and programming the key fob but did not resolve the issue it could be that the chip inside the key fob is faulty This can happen if the key fob has been dropped on hard surfaces exposed to salt water or even touched by dirty hands To diagnose this issue You will need to find a small key located in the edge of the fob which allows you to take it apart and remove the circuit board You will then be able to look for any damage or corrosion on the electronic chip It is recommended to use a clean paper towel to ensure that the chip is not damaged If you are unsure then you should also examine the battery connector terminals for cracks or broken If this is the case soldering the terminals back into place will typically restore the functionality of the key fob Similarly you can inspect the buttons to see whether theyve been worn out or damaged If the buttons are loose they can be resoldered into place unless one has physically snapped Interference Signals Few things are more annoying than staring at an No Fob Detected message when you attempt to start your car It typically happens at most inconvenient moments like the time youre late to work or when you have to pick up children from schooldaycare There are some things you can do to find out whats causing the issue Interference signals can cause the remote key fob to cease working properly This could be caused by things such as weather conditions buildings and transmitters that use the same frequency Interference can also occur if you have aftermarket equipment installed in your vehicle that transmits at the same frequency as the key fob Additionally if the key fob is exposed to salt or water it may be damaged Water can damage the rubber seals of the electronic chip particularly when the key fob is submerged in water for an extended time The chip could stop working and require replacement of the keyfob If you have a key that can be programmed and cleaned with isopropyl and electronic cleaners to bring it back to its original functionality If this doesnt help it is likely that the chip has burned out and will need to be replaced LockingUnlocking the Doors The buttons on the key fob transmit electronic signals to a solenoid within the car which converts the signal into a mechanical action that locks and unlocks the doors If the door lock doesnt work it could be due to an issue with the solenoid This requires professional auto repair shops to examine A dead 12 volt battery can also prevent the fob from functioning correctly This could happen if the battery is unable to charge or if the contacts become corroded and stop transferring electricity The good news is that a new battery can resolve this issue in a matter of minutes If the key fob isnt functioning after you replace the battery or reprogram it the problem could be in the receiver module The device receives radio frequency signals from the key fob and interprets them into controlling the functions of the vehicle If it breaks down it could be costly to repair To test if this is true put your spare key into the key slot Then turn the ignition on Press the key fob button twice within 10 seconds without removing it The Mazda 3 system synchronizes the key with the vehicle so you can now use it as your primary driving remote mazda car keys replacement can program up to three keys in this manner