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Changing the Battery in Your Mazda 3 Key Fob There's nothing more frustrating than getting in your vehicle after a long day and discovering that the key fob battery is dead. This is a straightforward solution that can be accomplished at a big box retailer or at a hardware store. Adding a spare key fob to your Mazda 3 can be an cost-effective way to stay away from having to be transported to a dealership and having them reprogram your keys. Battery Replacement The battery replacement in your Mazda 3 key fob is an easy process that can do at home. You should only replace it if the battery is dead or you get a message that reads “Low keyfob battery” on the multi-information display. Replace battery.” You'll need to use a flathead screwdriver, tape and patience to open the case. Locate a notch or gap in the bottom metal part of your Mazda 3's key fob and then insert the head of the screwdriver into it to pry off the lower portion. Repeat the process for the top piece of metal but be careful not to damage the rubber ring at the bottom of the case. Once the fob's case is open, you'll be able to see a slot on either side of the case that houses the battery. Start on the other side of the case and gently push it open. Take out the old CR2025 and replace it with a new one, making sure you place it face-up to ensure the correct direction of polarity. Place the battery cap on the other side and attach both sides of your key fob case by pressing until they click. Now that you've replaced the battery Test the fob to confirm it is working by locking and unlocking your doors. If everything is in order the Mazda 3 remote features can be used again. Pairing Issues If your key fob has stopped suddenly it could mean that the transmitter in the car is damaged. It is usually a job for a professional, and you require a new key fob. If you've tried replacing the battery and reprogramming the key fob, but this does not solve the issue, it is possible that the chip inside the key fob might be faulty. This can happen if the key fob was dropped on hard surfaces or exposed to salt water or even touched by dirty hands. You will need to locate the tiny “key”, which is built into the seam to remove the circuit board and determine the problem. You will then be able to examine for any damage or corrosion on the electronic chip. It is best to clean the paper towel to ensure that the chip is not damaged. If you aren't sure then you should also examine the battery connector terminals for cracks or breakage. If this is the case it is possible to solder the terminals back to their original position will usually restore functionality to the key fob. Similarly, you can inspect the buttons to determine whether they are worn out or damaged. If they are loose, they can be resoldered into position, unless they've physically snapped. Interference Signals There is nothing more frustrating than looking at a “No Fob Detected” message when trying to start your vehicle. It typically happens at most awkward times, such as when you are late for work or if you're picking up kids from daycare/school. There are some things you can do to troubleshoot and find out the root of the issue. Interference signals can cause the remote key fob not to function properly. mazda 5 key fob can be caused from objects such as weather conditions, buildings, and transmitters that operate on the same frequency. Interference may occur if your vehicle is equipped with aftermarket equipment that transmits at the same frequency as your key fob. The key fob could be damaged if exposed to salt water or water. Water can penetrate the rubber seals of the electronic chip especially if the key fob is submerged in water for an extended time. The chip could stop working and require replacement of the keyfob. If you have a key that is able to be programmed or programmed, you can clean it with isopropyl or electronic cleaners to bring it back to its original functionality. If this does not help, the chip is likely to be damaged and will need to be replaced. Locking/Unlocking of the Doors The buttons on the fob's key send electronic signals to the solenoid in the car, which converts 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 auto repair shop. A dead 12V battery can cause the fob to stop functioning properly. This can occur if your battery is not charged or if the contacts become corrosion-prone. The good news is that a new battery is able to resolve this issue in a matter of minutes. The receiver module could be the reason why the key fob doesn't work after replacing batteries or reprogram the device. This device receives radio frequency signals from the key fob and interprets them to control the functions of the vehicle. If it fails, it can be expensive to repair. To determine if this is the case, start by inserting your spare key into the key slot and setting the ignition to ON. Press the key fob button twice within 10 seconds without taking it. The Mazda 3 system synchronizes the key with the vehicle, so you can use it as your primary remote for driving. This allows you to program up to three keys.