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Changing the Battery in Your Mazda 3 Key FobThere’s nothing more annoying than getting to your car after a long day, and discovering that your key fob battery is dead. This is a straightforward fix that can be done at a big box retailer or at a hardware store.A spare key fob for your Mazda 3 is an inexpensive alternative to not having to take your vehicle to a dealership in order to have them re-program your keys.Battery ReplacementRemoving the battery from the Mazda 3 key fob is an easy procedure that you can perform at home. It is recommended to replace it if the battery fails or you see a message reading “Low keyfob battery” on the multi-information display. Replace battery.”To open the key fob’s case it requires a tape-wrapped flathead screwdriver, along with some patience. Find a gap or notch in the bottom of the metal part of your Mazda 3’s key fob, and then insert the head of the screwdriver in 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 opened, you’ll notice an opening on either side of the case that houses the battery. Use the tape-wrapped flathead screwdriver to gently open the case, starting on one side before moving to the opposite. Remove the battery that was used and place in the new CR2025 to ensure that it’s facing up to ensure proper orientation. Then, put the cap of the battery back on and reattach both sides to the key fob case. Keep pressing until you hear them click.After you’ve replaced the battery, test the fob to make sure it functions by locking and unlocking your doors. If everything appears to be working then you’re able to use the Mazda 3’s remote features on the road again!Pairing IssuesIf your key fob stopped working suddenly it could be because the transmitter inside the car is damaged. This usually requires the assistance of a professional for repair and may require a new replacement key fob.If you’ve tried to replace the battery and reprogram the key fob but it’s not working it is possible that the chip inside the key fob might be defective. This can occur if the key fob was dropped on hard surfaces, exposed to salt water, or even touched by dirty hands.To identify the issue To determine the cause, you must locate a tiny “key” built into the fob’s seam that allows you to open it up and remove the circuit board. You will then be able to examine for any corrosion or damage on the electronic chip. It is best to use a clean paper towel to avoid damaging the microchip.If you’re not sure it is possible to check the battery connector’s terminals for cracks or breakage. If this is the case, carefully connecting them back will usually restore the function of the key fob. Also, you can check the buttons to determine if they are worn or damaged. If the buttons are loose, they can be resoldered into position, unless they’ve physically snapped.Interference SignalsThere is nothing more frustrating than gazing at an “No Fob Detected” message when you attempt to start your car. It happens at the worst occasions, such as when you’re late for work or when you have to pick up your children from daycare/school. There are several things you can do to troubleshoot and find out what’s causing the problem.Interference signals can cause the remote key fob to stop functioning in a proper manner. This could be caused by objects such as buildings, weather conditions, and transmitters that operate on the same frequency. Interference could also occur if you have equipment from an aftermarket manufacturer installed in your vehicle that transmits at the same frequency as the key fob.In addition, if your key fob is exposed to salt or the water, it might be damaged. The rubber seals on the chip’s electronic components can be damaged by water, particularly when it is submerged for long periods of time like in a pool or ocean at the beach. The chip could stop working and require replacement of the keyfob. If you have a programable key, you can clean the chip with isopropyl alcohol or an electronic cleaner to aid in its return to functionality. If this doesn’t work then it’s likely that the chip is fried and requires replacement.Locking and Unlocking of DoorsThe buttons on the keys send electronic signals to a solenoid within the car, which converts that signal into mechanical action that locks and unlocks the doors. If your door lock does not work, it could be an issue with the solenoid. This will require expert auto repair shops to examine.A dead 12 volt can also prevent the fob from working properly. This could happen if the battery’s charge is lost or the contacts become corroded, and stop transferring electricity. The good news is that a new battery can fix this issue in just minutes.The receiver module may be the cause of the issue if the key fob does not function after replacing the battery or program the device. The device receives radio frequency signals from the key fob and interprets them to control the vehicle’s functions. It can be expensive to repair if it becomes faulty.To check whether this is the case, begin by putting your spare key into the key slot and turning the ignition to ON. Press the key fob button twice within 10 seconds without removing it. mazda keys replacement with the vehicle and you can now use it as your primary remote for driving. This allows you to program up to three keys.