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Changing the Battery in Your Mazda 3 Key Fob There is nothing more frustrating than stepping into your car after a long work day and discovering that your key fob battery is dead. This is a straightforward fix that can be done at a major box retailer or hardware store. A spare key fob for your Mazda 3 is an inexpensive way to avoid having to take your vehicle by a dealership to let them reprogram the keys. Battery Replacement You can change the battery on your Mazda 3 keyfob at home. It is recommended to replace it if the battery goes out or if you get a message that reads “Low keyfob battery” on the multi-information display. Replace battery.” To open the key fob's casing it requires a tape-wrapped flathead screwdriver, along with some patience. Locate a notch or gap in the bottom part of the metal of the Mazda 3's key fob and insert the head of the screwdriver to break off the lower half. Repeat the process for the top part of the metal but be careful not to damage the rubber ring on the bottom of the key fob's case. When the fob case is open, you'll see the slots on either side of the case, which houses the battery. Make use of the tape-wrapped flathead screwdriver to gently the case open, beginning at one end and shifting to the other. Take out the old CR2025 and replace it with a new one, making sure you place it face-up to ensure the correct the polarity. Place the battery cap on again and secure both sides of your key fob case by pressing until they click. After you've replaced the battery check the fob to verify that it works by locking and unlocking your doors. If everything looks good then your Mazda 3 remote features can be used again. Pairing Issues If your key fob stops working suddenly it could be because the transmitter inside your car is damaged. This usually requires an expert to repair it and will likely require a new replacement key fob. If you have tried replacing the battery and reprogramming the key fob but did not resolve the issue it is possible that the chip in the key fob might be faulty. This can occur if the key fob was dropped on hard surfaces, exposed to salt water or even touched by dirty hands. To diagnose this issue it is necessary to locate a small “key” located in the edge of the fob which allows you to open it and remove the circuit board. Then, you will be able to examine for any corrosion or damage on the electronic chip. To avoid damaging the chip, it is recommended to use a clean paper towel. It is also possible to take a closer look at the battery connector's terminals to see if they are cracked or broken. If this is the case, then carefully reconnecting them can usually restore the function of the key fob. In the same way, you can examine the buttons to determine if they are worn or damaged. If the buttons are loosened, they can be soldered back to their original position unless they have physically snapped. Interference Signals Few things are more annoying than staring at a “No Fob Detected” message when you attempt to start your vehicle. It happens at the worst situations, like when you're running late to work or have to pick up your children from daycare/school. The good news is that there are steps you can take to troubleshoot the issue and figure out the root of the problem. Interference signals can disrupt the remote key fob signal from the vehicle and cause it to not work correctly. This could be due to objects such as weather conditions, buildings, and transmitters using the same frequency. Interference can also occur when you install aftermarket equipment in the vehicle that transmits at the same frequency as the key fob. In addition, if the key fob is exposed to salt or waters, it could be damaged. The rubber seals on the electronic chip could be shattered by water, particularly when it is submerged for long periods of time like in a pool or at the beach. mazda key replacement cost could cause the chip to stop functioning and require replacement of the key fob. If you have a key that is able to be programmed to work, you can clean it with isopropyl and electronic cleaners to restore its function. If this doesn't help the chip, it is likely to be damaged and will need to be replaced. Locking and Unlocking the Doors The buttons on the key fob transmit electronic signals to the solenoid inside the car, which transforms this signal into a mechanical action. It locks and unlocks doors. If the door lock isn't working, the issue could be a solenoid malfunction that requires some investigation by a professional auto repair shop. A dead 12 volt could cause the fob to stop functioning properly. This could happen if the battery has lost its charge or if the contacts become corrosion-prone. The good news is that a new battery can solve this issue in only minutes. The receiver module may be the cause of the issue if the key fob doesn't work after you replace the battery or re-program the device. The device receives radio frequency signals from the key fob and interprets them to control the vehicle's functions. It can be expensive to repair if it becomes faulty. To determine if this is true, put your spare key in the key slot. Then, turn the ignition on. Press the key fob button two times within 10 seconds without removing it. The Mazda 3 system synchronizes the key with the vehicle and you can use it as your primary driving remote. You can program up to three keys in this manner.