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Changing the Battery in Your Mazda 3 Key FobThere’s nothing more frustrating than returning to your car after a long day and realizing that the key fob battery 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 take your vehicle to a dealership to have them reprogram the keys.Battery ReplacementRemoving the battery from your Mazda 3 key fob is an easy procedure that you can perform at home. You should only replace it when the battery is dead or you see a message saying “Low keyfob battery” on the multi-information display. Replace battery.”You’ll need a flathead screwdriver with tape and patience to open the case. Place the flathead screwdriver’s tip in a notch or gap, on the bottom metal of the Mazda 3 key fob to cut off the lower half. Repeat this step for the top metal part however, be careful not to damage the rubber ring on the bottom of the key fob’s case.There’s a slot on each side of the case that houses the battery. Start on the other side of the case, and then gently push it open. Remove the old CR2025 and replace it with a brand new one, making sure you place it face-up to ensure the correct the polarity. Then, put the battery cap back on and reconnect both sides of the key fob’s case, pressing until you can hear them click.Now that you’ve replaced the battery, test the fob to make sure it works 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 IssuesIf your key fob stopped working all of a sudden it could be because the transmitter inside the car is damaged. It’s usually a task for a professional, and you require a new key fob.If you’ve tried replacing the battery and reprogram the key fob, but it’s not working the chip inside the key fob may be defective. This can happen when the key fob was dropped on hard surfaces, exposed to salt water or even brushed by dirty hands.You’ll need to locate the small “key”, which is built into the seam, to take off the circuit board and determine the problem. You can then examine the chip for corrosion or damage. It is recommended to use a clean, dry paper towel to keep the microchip from being damaged.You can also take a close look at the battery connector’s terminals to determine if they’re cracked or broken. If this is the case, carefully reconnecting them can generally restore the functionality of the key fob. Similarly, you can inspect the buttons to determine whether they’ve been worn out or damaged. If the buttons are loose, they can be re-soldered regardless of whether a button has physically snapped off.Interference SignalsThere’s nothing more difficult than trying to start your car and then seeing the message “No Fob Detected”. It usually happens at the most unpopular time, such as when you are late for work or picking up children from daycare or school. The good thing is that there are steps you can take to pinpoint the issue and figure out the cause.Interference signals can cause the remote key fob to stop functioning in a proper manner. This can be caused by objects such as weather conditions, buildings, and transmitters that operate on the same frequency. Interference can also occur if you have an aftermarket device installed in the vehicle that transmits at the same frequency as the key fob.The key fob may also be damaged if it is exposed to salt water or water. The rubber seals on the electronic chip may be penetrated by water, particularly when it is submerged over an extended period of time, like in a swimming pool or at the beach. The chip could stop working and may require replacement of the keyfob. If you have a key which can be programmed or programmed, you can clean it using isopropyl or electronic cleaners to bring it back to its original function. If this doesn’t help will be able to fix the issue, then the chip has been damaged and needs to be replaced.Locking and Unlocking of DoorsThe buttons on the fob’s key send electronic signals to the solenoid inside the car, which converts the signal into mechanical action. This locks and unlocks doors. If your door lock isn’t working it could be because of an issue with the solenoid. This requires professional auto repair shops to investigate.A dead 12V battery can also prevent the fob from working effectively. This is the case if the battery is unable to charge or if the contacts get corroded and stop transferring electricity. This issue can be solved in minutes with a new battery.If the key fob doesn’t work after you change the battery or try to re-program it then the problem may be with the receiver module. This device receives radio frequency signals from the key fob and interprets them into controlling the functions of the vehicle. It can be a costly repair if it becomes faulty.To test if this is true, insert your spare key into the key slot. Then turn the ignition ON. Press the key fob button twice within 10 seconds, without removing it. mazda 3 car key to the vehicle and you can use it as your primary remote for driving. This allows you to program up three keys.