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Changing the Battery in Your Mazda 3 Key FobThere’s nothing more annoying than getting in your vehicle after a long day, and discovering that the key fob battery is dead. This is a straightforward fix that can be found at a big box retailer or at a hardware store.Incorporating a spare key fob to your Mazda 3 can be an cost-effective way to stay away from the hassle of being towed to the dealership and having them reprogram your keys.Battery ReplacementYou can replace the battery on your Mazda 3 keyfob at home. However, you should only replace the battery if it fails, or when the key fob displays a message in the multi-information display stating, “Low key fob battery. Replace battery.”To open the key fob’s case You’ll need a tape wrapped flathead screwdriver and some patience. Place the flathead screwdriver’s head in a notch or gap in the bottom part of the Mazda 3 key fob to take off the lower portion. Repeat this process for the top metal piece Be careful not to damage the rubber ring on the bottom of the key fob’s case.Once the fob case is open, you’ll find a slot on either side of the case, which houses the battery. Start on the opposite side of the case and then gently push it open. Remove the old battery, and put in the new CR2025, making sure that it’s in the right orientation for the correct orientation. Attach the cap to the battery again and attach both sides of your key fob case by pressing until they click.After replacing mazda 2 key battery replacement after replacing the battery, lock and unlock your doors to verify that the fob is working. If everything seems to be in good order you’re good to go. Mazda 3 remote features can be used again.Pairing IssuesThis could be a sign that the transmitter in your car has been damaged. It’s usually a task to a professional and you will need a new key fob.If you have tried replacing the battery and reprogramming the key fob, but this isn’t solving the issue it is possible that the chip in the key fob is damaged. This could happen if the keyfob was dropped, exposed to saltwater, or handled by dirty fingers.You’ll need to find an extremely small “key” that is built into the seam to remove the circuit board and identify the problem. You will then be able to check for any damage or corrosion on the chip. To prevent damaging the chip, it is recommended to clean the chip with a new paper towel.If you’re unsure you are not sure, you can check the battery connector terminals for cracks or broken. If this is the case, carefully soldering them back in place can often restore the function of the key fob. In the same way, you can examine the buttons to see whether they are worn out or damaged. If the buttons are loose, they can easily be re-soldered regardless of whether the button is physically 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 awkward times, such as when you’re running late for work or when you have to pick up children from daycare or school. There are some things you can do to troubleshoot and find out what’s the cause.Interference signals can cause the remote key fob to stop functioning properly. This can be caused by things like weather conditions, buildings, and transmitters that operate on the same frequency. Interference may also occur if you have equipment from an aftermarket manufacturer installed in the vehicle that transmits at the same frequency as the key fob.The key fob can also be damaged if exposed to water or salty water. 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 swimming pool or at the beach. The chip can stop working and may require replacement of the keyfob. If you have a programmeable key it is possible to clean the chip with isopropyl Alcohol or an electronic cleaner to help it return to working. If this doesn’t help will be able to fix the issue, then the chip has burned out and needs to be replaced.Locking or Unlocking the DoorsThe buttons on the keys send electronic signals to a solenoid inside the car, which converts that signal into mechanical action that locks and unlocks the doors. If the door lock isn’t working, the problem could be a solenoid issue that requires investigation by an expert repair shop for autos.A dead 12 volt battery could also prevent the fob from functioning properly. This could happen if your battery loses its charge or if your contacts become corrosion-prone. The good news is that a new battery is able to fix this problem in just minutes.If the key fob isn’t working after you replace the battery or try to program it again the problem could be with the receiver module. The device interprets radio frequency signals transmitted by the key fob to control the vehicle. If it fails, it can be expensive to repair.To check whether this is the case, begin by inserting the spare key into the key slot and setting the ignition to ON. Press the key fob two times in 10 seconds, without removing it. The Mazda 3 system will now sync the key to the car and allow you to use it as your primary remote for driving. You can program up to three keys this manner.