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Changing the Battery in Your Mazda 3 Key Fob There is nothing more frustrating than getting in your car after a long work day and discovering that your key fob battery is dead Luckily its an easy fix by purchasing a simple battery replacement from a hardware store or big box retailer A spare key fob for your Mazda 3 is an inexpensive method to avoid having to take it by a dealership to let them reprogram the keys Battery Replacement Change the battery in your Mazda 3 key fob is an easy process that can do at home However you should only replace the battery when it dies or if the key fob displays a message in the multiinformation display Low key fob battery Replace battery To open the key fobs casing youll need a tapewrapped flathead screwdriver and a bit of patience Put the head of the flathead screwdriver into a notch or gap on the bottom metal of the Mazda 3 key fob to remove the lower part Repeat the procedure for the top piece of metal but be sure not to damage the rubber ring at the bottom of the case When the fob case is open youll see the slots on either side of the case that houses the battery Use the tapewrapped flathead screwdriver to gently pry open the case beginning on one side and then shifting to the other Take out the old CR2025 and replace it with a new one making sure that you place it faceup to ensure the correct polarity Place the battery cap on again and attach both sides of your key fob case by pressing until they click After replacing the battery lock and unlock your doors to ensure whether the fob is working If everything is in order your Mazda 3 remote features can be used again Pairing Issues If your key fob has stopped working suddenly it could mean that the transmitter inside your car is damaged This is usually a matter of an expert repair and will likely require a new replacement key fob If you have tried replacing the battery and programming the key fob but this has not solved the problem it is possible the chip in the key fob might be defective This can occur if the key fob has been dropped on hard surfaces exposed to salt water or even brushed by dirty hands To determine the cause To determine the cause you must find a small key located in the fobs seam that lets you take it apart and take out the circuit board You will then be able to look for any damage or corrosion on the chip To prevent damaging the microchip it is recommended to clean the chip with a new paper towel If youre unsure you are not sure you can check the battery connector terminals for cracks or breaks If this is the case then carefully soldering them back in place can often restore the function of the key fob Also you can check the buttons to see if they are worn or damaged If the buttons are loosened they can be soldered back into position unless theyve physically snapped Interference Signals Few things are more frustrating than glancing at a No Fob Detected message when you attempt to start your car This typically happens at most unpopular times such as when youre late for work or when you have to pick up children from schooldaycare There are some things you could try to figure out whats causing the problem Interference signals can cause the remote key fob to stop working properly This could be caused by things like weather conditions buildings and transmitters that use the same frequency Interference can occur when 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 waters it could be damaged The rubber seals on the electronic chip can be shattered by water particularly in the event that it is submerged for long periods of time like in a pool or at the beach This can cause the chip to stop working and may require replacement of the key fob If you have a key which can be programmed you can clean it with isopropyl or electronic cleaners to restore its function If this doesnt help will be able to fix the issue then the chip has fried and must be replaced Locking or Unlocking the Doors The buttons on the fobs key send electronic signals to the solenoid of the car which transforms the signal into mechanical action This locks and unlocks doors If the door lock is not working it may be a solenoid issue that requires some investigation with the assistance of an expert repair shop for autos A dead 12 volt battery can cause the fob to stop functioning correctly This could happen if the batterys charge is lost or the contacts are corroded and stop transmitting electricity mazda keys replacement 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 This device receives radio frequency signals from the key fob and interprets them into controlling the functions of the vehicle It can be a costly repair if it becomes faulty To verify if this is true place your spare key into the key slot Then turn the ignition ON Press the key fob two times in a period of 10 seconds without removing it The Mazda 3 system synchronizes the key with the vehicle and you can now use it as your primary driving remote You can program up to three keys this manner
