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Changing the Battery in Your Mazda 3 Key Fob Its a pain to get in your car at the end of a long day and find that the key fob is dead Fortunately it is an easy fix by purchasing the simple replacement of a battery 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 reprogram the keys Battery Replacement You can change the battery on your Mazda 3 keyfob at home However you should replace the battery when it fails or when the key fob displays a message in the multiinformation display Low key fob battery Replace battery To open the case of your key fob it requires a tapewrapped flathead screwdriver and a bit of patience Put the head of the flathead screwdriver in a notch or gap on the bottom 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 scratch the rubber ring on the bottom of the case Theres a slot the opposite side of the case which houses the battery Start on the opposite side of the case and gently push it open Remove the old battery and put in a new CR2025 ensure that its facing up to ensure proper orientation Then put the cap on the battery and reattach both sides to the key fob case Keep pressing until you can hear them click After replacing the battery check the fob to confirm its working by locking and unlocking your doors If everything appears to be working then you can begin using the Mazda 3s remote features for the first time Pairing Issues This could indicate that the transmitter in your car may have been damaged Its usually a job to a professional and you will need a new key fob If youve tried replacing the battery and reprogram the key fob but its not working then the chip in the key fob might be defective This could be the case if the keyfob was dropped exposed to saltwater or the touch of dirty fingers To determine the cause To determine the cause you must locate a tiny key that is embedded into the fobs seam that lets you take it apart and take out the circuit board Then you will be able check for any corrosion or damage on the chip It is best to use a clean paper towel to avoid damaging the microchip You can also examine the battery connectors terminals to examine if theyre damaged or cracked If this is the case then carefully reconnecting them can usually restore the function of the key fob You can also inspect the buttons for wear or damage If the buttons are loose they can be resoldered regardless of whether the button is physically snapped off Interference Signals There are few things more frustrating than staring at the No Fob Detected message when trying to start your vehicle It typically happens at most difficult moments such as when youre late for work or when you are picking up your children from schooldaycare There are a few things you can try to figure out whats causing the issue Interference signals can disrupt the remote key fobs signal from the vehicle which causes it to not function correctly This could be due to things like weather conditions buildings and transmitters using the same frequency Interference could also occur if you install aftermarket equipment in your vehicle that transmits on the same frequency as the key fob The key fob could be damaged if exposed to salt water or water The rubber seals on the electronic chip can be damaged by water particularly when it is submerged over long periods of time like in a pool or at the beach The chip could stop working and may require replacement of the keyfob If you have a key that is able to be programmed to work you can clean it using isopropyl or electronic cleaners to bring it back to its original functionality If this does not help the chip is likely to be fried and will require to be replaced LockingUnlocking the Doors The buttons on the keys send electronic signals to a solenoid in the car that then transforms the signal into a mechanical action that locks and unlocks the doors If the door lock fails to work it could be an issue with the solenoid This will require professionals from auto repair shops to investigate A dead 12 volt could also prevent the fob from functioning properly This could happen if the battery is unable to charge or if the contactors become corroded and stop conducting electricity G28CarKeys is that a new battery is able to fix this problem in just minutes The receiver module may be the cause if the key fob isnt working after you replace the battery or reprogram the device The device interprets radio frequency signals received by the key fob to control the vehicle It can be expensive to repair if it becomes faulty To check if this is the case begin by inserting your spare key into the key slot and setting the ignition to ON Press the key fob twice within 10 seconds but without removing it The Mazda 3 system synchronizes the key to the vehicle and you can now use it as your primary driving remote This allows you to program up to three keys