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Changing the Battery in Your Mazda 3 Key Fob It is frustrating to drive off at the end of a long hard day and discover that your key fob is dead This is a simple fix that is easily done at a big box retailer or at a hardware store Incorporating a spare key fob to your Mazda 3 can be an affordable solution to free yourself from having to be taken to the dealer and having them reprogram your keys Battery Replacement Removing the battery from your Mazda 3 key fob is an easy procedure that you can do at home It is recommended to replace it if the battery goes out or if you notice a message stating Low keyfob battery on the multiinformation display Replace battery To open the case of your key fob youll need a tapewrapped flathead screwdriver and a bit of patience Locate a notch or gap in the bottom portion of the metal of the Mazda 3s key fob and then insert the tip of the screwdriver into it to break off the lower portion Repeat the procedure for the top metal piece but be sure not to damage the rubber ring on the bottom of the case Once the fob case is open youll see a slot on either side of the case which houses the battery Use the tapewrapped flathead screwdriver to gently open the case beginning with one side and shifting to the other Remove the battery that was used and place in a new CR2025 ensure that its facing up to ensure proper polarity Attach the cap to the battery the other side and attach both sides of your key fob case by pressing until they click After replacing the battery after replacing the battery lock and unlock your doors to confirm that the fob is working If everything appears to be working you can start using your Mazda 3s remote features in the road Pairing Issues This could mean that the transmitter inside your car may have been damaged This is usually a matter that requires a professional You will need a new key fob If youve tried to replace the battery and reprogram the key fob but its not working then the chip in the key fob could be defective This could be the case if the keyfob has been dropped exposed to saltwater or handled by dirty fingers To identify the issue it is necessary to locate a small key embedded in the fobs seam that allows you to lift it open and take out the circuit board Then you will be able to examine for any damage or corrosion on the chip To avoid damaging the chip its recommended to use a clean paper towel You may also take a close look at the battery connectors terminals and examine if theyre cracked or broken If this is the case soldering the terminals back to their original position will usually restore functionality to the key fob Additionally mazda car keys replacement can look at the buttons to determine whether theyve been worn out or damaged If the buttons are loose they can be soldered back in place and also if the button has actually snapped off Interference Signals Few things are more annoying than staring at the No Fob Detected message when trying to start your vehicle It typically happens at most awkward time such as when you are late for work or if youre picking up kids from daycareschool There are a few things you can try to figure out whats causing the problem Interference signals can disrupt the remote key fobs signal to the vehicle and cause it to not function properly This can be caused by things like buildings weather conditions and transmitters that operate on the same frequency Interference can also occur if you have an aftermarket device installed in the vehicle that transmits at the same frequency as the key fob In addition if the key fob is exposed to salt or the water it might be damaged Water can penetrate the rubber seals of the electronic chip particularly in the event that the key fob is submerged in water for a prolonged period of time This can cause the chip to stop working and will require replacement of the key fob If you have a programmeable key it is possible to clean the chip with isopropyl alcohol or an electronic cleaner to aid in its return to working If this doesnt work the chip it is likely to be damaged and needs to be replaced LockingUnlocking of the Doors The buttons on the key fob send electronic signals to the solenoid of the car which transforms this signal into a mechanical action It locks and unlocks doors If your door lock doesnt work it could be because of an issue with the solenoid This will require professionals from auto repair shops to examine A dead battery of 12 volts can also stop the fob from functioning properly This can happen if the batterys charge is lost or if the contactors are corroded and stop transmitting electricity The problem can be addressed in a matter of minutes by replacing the battery The receiver module could be the cause of the issue if the key fob doesnt work after replacing batteries or reprogram the device The device interprets radio frequency signals received by the key fob to control the vehicle It could be a costly repair if the device becomes defective To test if this is correct place 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 allow you to use it as your primary remote for driving This allows you to program up to three keys