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Changing the Battery in Your Mazda 3 Key FobIt's a pain to drive off at the end of a long, hard day and find that the key fob is dead. Luckily, it's an easy fix by purchasing simple battery replacement from a hardware store or big box retailer.Incorporating a spare key fob to your Mazda 3 can be an inexpensive way to save yourself from having to be towed to the dealership and having them reprogram your keys.Battery ReplacementChange the battery in your Mazda 3 key fob is an easy procedure that you can perform at home. It is recommended to replace it when the battery goes out or if you notice a message stating "Low keyfob battery" on the multi-information display. Replace battery."You'll need an flathead screwdriver along with tape and patience to open the case. Put the flathead screwdriver's tip in a notch, or gap, on the bottom metal of the Mazda 3 key fob to pry the lower half off. Repeat this procedure for the top portion of the metal however, be careful not to scratch the rubber ring at the bottom of the key fob's case.There is a slot on each side of the case that contains the battery. Start on the opposite side of the case and then gently push it open. Remove the old battery and then put in a new CR2025 and make sure it's face-up for the correct orientation. Then, put the cap on the battery and reconnect both sides of the key fob's case. Continue pressing until you can hear them click.After you've replaced the battery, test the fob to verify that it is working by locking and unlocking your doors. If everything looks good then you're able to use your Mazda 3's remote features in the road!Pairing IssuesThis could mean that the transmitter inside your car has been damaged. It is usually a job for a professional and you require a new key fob.If you've attempted to replace the battery and reprogramme the key fob, but it hasn't worked it is possible that the chip inside the key fob might be defective. This can happen if the keyfob was dropped, exposed to saltwater, or touched by dirty fingers.You will need to locate a small "key", which is built into the seam, to take off the circuit board and diagnose the issue. You can then examine the electronic chip for damage or corrosion. To prevent damaging the chip, it is recommended to clean the chip with a new paper towel.If you're unsure then you should also examine the battery connector terminals for cracks or breaks. If this is the case it is possible to solder the terminals back to their place will usually bring back functionality to the key fob. It is also possible to check the buttons for damage or wear. If they are loose, they can be soldered back into place, unless one has physically snapped.Interference SignalsThere's nothing more frustrating than trying to start your vehicle and getting the message "No Fob Detected". It happens at the worst occasions, such as the time you're late to work or have to pick up your children from daycare or school. The good thing is that there are a few steps you can take to pinpoint the issue and determine the root of the problem.Interference signals can cause the remote key fob to cease working in a proper manner. This can be caused by things like buildings, weather conditions and transmitters that operate on the same frequency. Interference can occur if your vehicle is equipped with aftermarket equipment that transmits at the same frequency as your key fob.The key fob may also be damaged if exposed to water or salty water. Water can damage the rubber seals of the electronic chip particularly when the key fob has been submerged in water for a lengthy duration. This can cause the chip to cease working and will require replacement of the key fob. If you own a programmable key you can clean the chip using isopropyl alcohol or an electronic cleaner to aid in its get back to its original functionality. If this doesn't work then it's likely that the chip has burned out and will need to be replaced.Locking/Unlocking the DoorsThe buttons on the key fob send electronic signals to the solenoid in the car, which converts this signal into mechanical action. This locks and unlocks doors. If the door lock isn't working, the issue could be a solenoid issue that requires some investigation by a professional auto repair shop.A dead 12 volt battery could cause the fob to stop functioning correctly. This can happen if the battery's charge is lost or if the contactors become corroded, and stop transferring electricity. The problem can be addressed in just a few minutes by purchasing a new battery.If the key fob isn't functioning after changing the battery or re-program it the problem could be with the receiver module. This device detects radio frequency signals sent by the key fob to control the vehicle. It can be a costly repair if it becomes faulty.To determine if this is the case, begin by inserting your spare keys into the key slot and setting the ignition to ON. Press mazda 3 car key in 10 seconds, without removing it. The Mazda 3 system will now be able to synchronize the key with your car and allow you to use it as your primary remote for driving. You can program up to three keys in this way.