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Changing the Battery in Your Mazda 3 Key Fob There is nothing more frustrating than stepping into your vehicle after a long day and finding that the key fob battery is dead. Fortunately, this is an easy fix by purchasing a simple battery replacement from the hardware store or big box retailer. The addition of a spare key fob to your Mazda 3 can be an cost-effective way to stay away from the hassle of being taken to the dealer and having them re-program your keys. Battery Replacement Change the battery in the Mazda 3 key fob is an easy procedure that you can perform at home. But, you should only replace the battery if it dies, or if the key fob displays a message in the multi-information display that reads, “Low key fob battery. mazda new key fob .” You'll need to use a flathead screwdriver and 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 tip of the screwdriver in it to cut off the lower half. Repeat this procedure for the top metal piece Be careful not to scratch the rubber ring on the bottom of the key fob's case. Once the fob case has been opened, you'll notice an opening on either side of the case that houses the battery. Start on the other side of the case, and then gently open it. Remove the old CR2025 and replace it with a new one, ensuring that you place it face-up to ensure the correct direction of polarity. Attach the cap to the battery again and secure both sides of your key fob case by pressing until they click. Once you've replaced your battery Test the fob to make sure it functions by locking and unlocking your doors. If everything appears to be working you're good to go. Mazda 3 remote features can be used again. Pairing Issues If your key fob stop working suddenly, this could indicate that the transmitter in the car has been damaged. It's usually a job for a professional and you will need a new key fob. If you've tried to replace the battery and reprogramme the key fob but it's not working, the chip inside the key fob might be faulty. This could happen if the keyfob has been dropped, exposed to saltwater, or touched by dirty fingers. You'll need to find an extremely small “key”, which is built into the seam, to take off the circuit board to identify the issue. Then, you will be able to check for any corrosion or damage on the electronic chip. To avoid damaging the chip, it is recommended to clean the chip with a new paper towel. If you're not sure you are not sure, you can check the battery connector terminals for cracks or broken. If this is the case, carefully attaching them back can often restore the function of the key fob. It is also possible to check the buttons for wear or damage. If the buttons are loose they can be resoldered into place unless one has physically snapped. Interference Signals There are few things more difficult than trying to start your vehicle and getting the message “No Fob Detected”. It happens at the worst possible times, like the time you're late to work or have to pick up your children from daycare or school. There are some things you can do to find out the root of the issue. Interference signals can cause the remote key fob to cease working in a proper manner. This can be caused by objects such as weather conditions, buildings and transmitters operating 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. Additionally, if the key fob is exposed to salt or water it may be damaged. The rubber seals on the chip's electronic components can be penetrated by water, particularly when it is submerged over 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 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 does not help the chip, it's likely to be fried and will require to be replaced. Locking and Unlocking of Doors The buttons on the key fob transmit electronic signals to the solenoid inside the car, which then converts the signal into mechanical action. This locks and unlocks doors. If the door lock doesn't work, it could be an issue with the solenoid. This requires expert repair shops to analyze. A dead 12 volt could also prevent the fob from functioning properly. This could happen if the battery loses its charge, or if the contacts are corroded and stop transmitting electricity. The problem can be addressed in a matter of minutes by replacing the battery. The receiver module could be the cause if the key fob won't work after replacing the battery or reprogram the device. This device detects radio frequency signals sent by the key fob to control the vehicle. If it breaks down it could cost a lot to fix. To check if this is the case, start by inserting your spare key into the key slot and turning the ignition to ON. Press the key fob button three times in a matter of 10 seconds without removing it. The Mazda 3 system synchronizes the key to the vehicle, and you can use it as your primary driving remote. This lets you program up three keys.