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Changing the Battery in Your Mazda 3 Key FobThere is nothing more frustrating than returning to your vehicle after a long and tiring day and discovering that your key fob battery is dead. This is a straightforward solution that can be accomplished at a big box retailer or hardware store.A spare key fob for your Mazda 3 is an inexpensive method to avoid having to be towed to a dealership to have them re-program your keys.Battery ReplacementYou can replace the battery on your Mazda 3 keyfob at home. However, you should only replace the battery if it is dead, or if the key fob displays a message on the multi-information display, "Low key fob battery. Replace battery."To open the key fob's case, you'll need a tape-wrapped flathead screwdriver, along with some patience. Put the head of the flathead screwdriver in a notch or gap on the bottom metal of the Mazda 3 key fob to pry the lower half off. Repeat the procedure for the top piece of metal Be careful not to damage the rubber ring that is on the bottom of the case.You'll find a slot on both sides of the fob case, where you can find the battery. Start on the opposite side of the case and then gently push it open. Remove the old CR2025 and replace it with a brand new one, making sure that you place it face-up to ensure the correct orientation. Then, put the cap back on and then reattach both sides of the key fob case, pressing until you hear them click.Once you've replaced your battery Test the fob to make sure it works by locking and unlocking your doors. If mazda key cut appears to be working then you're able to use your Mazda 3's remote features to drive again!Pairing IssuesThis could mean that the transmitter inside your car is damaged. This is usually a matter of the assistance of a professional for repair and may require a replacement key fob.If you've tried replacing the battery and programming the key fob, but did not resolve the issue it is possible that the chip inside the key fob might be defective. This could happen if the key fob has been dropped on hard surfaces or exposed to saltwater, or even touched by dirty hands.You'll need an extremely small "key", which is built into the seam, in order to remove the circuit board and identify the problem. You can then examine the electronic chip for corrosion or damage. To prevent damaging the chip, it is recommended to use a clean paper towel.If you aren't sure 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 restore functionality to the key fob. You can also check the buttons for wear or damage. If the buttons are loose, they can be re-soldered in the event that the button has actually snapped off.Interference SignalsThere's nothing more difficult than trying to start your car and then seeing the message "No Fob Detected". It typically happens at most difficult moments, such as when you're late for work or if you're picking up kids from daycare/school. There are some things you could do to troubleshoot and find out what's causing the problem.Interference signals can cause the remote key fob to cease working properly. This could be caused by things like buildings, weather conditions, and transmitters that use the same frequency. Interference may also occur if you install aftermarket equipment in the 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 could be shattered by water, particularly in the event that it is submerged for an extended period of time, like in a pool or ocean at the beach. This could cause the chip's function to cease and will require replacement of the key fob. If you have a key that has the ability to be programmed, you can clean it with isopropyl or electronic cleaners to restore its functionality. If this does not work, the chip is likely to be fried and will require to be replaced.Locking/Unlocking of the DoorsThe buttons on the key fob transmit 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 functioning, the issue could be a solenoid issue that requires some investigation by an expert repair shop for autos.A low-voltage battery can hinder the fob from functioning correctly. This could happen if your battery fails to charge or if the contacts are corrosion-prone. The good news is that a new battery can resolve this issue in a matter of minutes.The receiver module could be the reason why the key fob isn't working after you replace the battery or re-program the device. The device interprets radio frequency signals transmitted by the key fob to control the vehicle. If it malfunctions it could cost a lot to fix.To verify if this is correct, place your spare key in the key slot. Then, turn the ignition ON. Press the key fob button twice within 10 seconds without removing it. The Mazda 3 system synchronizes the key to the vehicle and you can now use it as your primary remote for driving. This allows you to program up to three keys.