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Changing the Battery in Your Mazda 3 Key Fob It is frustrating to get into your car at the conclusion of a long and tiring day and find that the key fob 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 way to avoid having to be towed to a dealership to have them reprogram the keys. Battery Replacement You can replace the battery on your Mazda 3 keyfob at home. It is recommended to replace it when the battery fails or you notice a message stating “Low keyfob battery” on the multi-information display. Replace battery.” mazda new key fob 'll need a flathead screwdriver with tape and patience to open the case. Find a gap or notch in the bottom part of the metal of your Mazda 3's key fob, and then insert the tip of the screwdriver into it to pry off the lower portion. Repeat the process for the top metal part but be careful not to scratch the rubber ring at the bottom of the key fob's case. Once the fob case has been open, you'll see an opening on either side of the case, which houses the battery. Start on one side of the case, and then gently open it. Remove the old battery, and put in the new CR2025 to ensure that it's facing upwards to ensure proper orientation. Install the cap on the battery again and secure both sides of your key fob case by pressing until they click. After you've replaced the battery, test the fob to confirm it works by locking and unlocking your doors. If everything seems to be in good order then your Mazda 3 remote features can be used again. Pairing Issues This could be a sign that the transmitter in your car may have been damaged. This is usually a matter to a professional and you will require a new key fob. If you have tried replacing the battery and programming the key fob, but this did not resolve the issue, it is possible that the chip in the key fob is malfunctioning. This can happen when the key fob has been dropped on hard surfaces, exposed to salt water, or even touched by dirty hands. You will need to locate an extremely small “key” that is built into the seam, to remove the circuit board to identify the problem. You can then examine the chip for damage or corrosion. It is best to use a clean, dry paper towel to prevent damaging the microchip. If you aren't sure then you should also examine the battery connector terminals for cracks or broken. If this is the case, then carefully attaching them back can often restore the function of the key fob. Similarly, you can inspect the buttons to determine whether they're worn or damaged. If the buttons are loose, they can be soldered back as well unless the button is physically snapped off. Interference Signals There's nothing more frustrating than trying to get the engine started in your vehicle and getting the message “No Fob Detected”. It typically happens at most difficult moments, like when you're late for work or picking up children from school/daycare. There are a few things you can do to help figure out what's causing the issue. Interference signals can disrupt the remote key fob signal from the vehicle, causing it to not function correctly. This could be due to things like weather conditions, buildings as well as transmitters operating on the same frequency. Interference could occur if your vehicle has aftermarket equipment that transmits at the same frequency as your key fob. In addition, if the key fob is exposed to salt or water waters, it could be damaged. The rubber seals on the electronic chip can be penetrated by water, particularly when it is submerged over long periods of time like in a swimming pool or at the beach. This could cause the chip to cease working, requiring replacement of the key fob. If you have a key that can be programmed or programmed, you can clean it with isopropyl and electronic cleaners to bring it back to its original functionality. If this doesn't work the chip, it's likely fried and will need to be replaced. Locking and Unlocking the Doors The buttons on the key fob send electronic signals to the solenoid inside the car, which transforms this signal into a mechanical action. This locks and unlocks doors. If the door lock isn't working, the problem could be a solenoid malfunction that requires some investigation with the help of an expert auto repair shop. A low-voltage battery can cause the fob to stop functioning correctly. This could happen if your battery is not charged or if the contacts become corroded. The good news is that a new battery can fix this issue in just minutes. If the key fob isn't working after you change the battery or try to program it again, the issue might be in the receiver module. This device detects radio frequency signals sent by the key fob to control the vehicle. It can be a costly repair if it becomes faulty. To check whether this is the case, begin by putting your spare key into the key slot and setting the ignition to ON. Press the key fob two times for 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 to three keys.