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Changing the Battery in Your Mazda 3 Key Fob It can be a bit frustrating to pull into your car at the end of a long day and discover that your key fob is dead. This is a straightforward fix that can be found at a major box retailer or at a hardware store. The addition of a spare key fob to your Mazda 3 can be an affordable way to keep yourself from the hassle of being transported to a dealership and having them reprogram your keys. Battery Replacement The battery replacement in the Mazda 3 key fob is a simple process that you can perform at home. But, it is best to replace the battery if it dies, or if the key fob shows a message on the multi-information display that reads, “Low key fob battery. Replace battery.” To open the case of your key fob You'll need a tape wrapped flathead screwdriver and a bit of patience. Place the head of the flathead screwdriver in a notch, or gap on the bottom of the metal of the Mazda 3 key fob to remove the lower part. Repeat mazda 3 lost key for the top piece of metal however, be careful not to scratch the rubber ring that is on the bottom of the case. There's a slot each side of the fob case that houses the battery. Start on the other side of the case and then gently lift it up. Remove the old battery, and put in a new CR2025 and make sure it's face-up for the correct orientation. Finally, put the battery cap back on and then reattach both sides of the key fob's case. Continue pressing until you can hear them click. After replacing the battery After replacing the battery, lock and unlock your doors to test that the fob works. If everything is working you're now able to use your Mazda 3's remote capabilities for the first time! Pairing Issues This could indicate that the transmitter in your car may have been damaged. This is usually a matter that requires a professional. You will require a brand new key fob. If you've tried replacing the battery and reprogram the key fob but it hasn't worked it is possible that the chip inside the key fob could be defective. This can happen if your keyfob has been dropped, exposed to saltwater, or the touch of dirty fingers. To determine the cause it is necessary to locate a tiny “key” located in the seam of the fob which allows you to open it and take out the circuit board. Then, you can examine the chip for corrosion or damage. It is best to use a clean towel to avoid damaging the microchip. If you're not sure you are not sure, you can check the battery connector's terminals for cracks, or breaks. If this is the case then resoldering the terminals into place will typically restore the functionality 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 re-soldered as well unless a button has physically snapped off. Interference Signals Few things are more frustrating than gazing at an “No Fob Detected” message when you attempt to start your vehicle. It typically happens at most inconvenient moments, like when you're running late for work or if you're picking up kids from daycare or school. There are several things you can do to help figure out what's the cause. Interference signals can cause the remote key fob to stop working properly. This could be caused by objects like buildings, weather conditions and transmitters that use the same frequency. Interference can occur when your vehicle is equipped with aftermarket equipment that transmits at the same frequency as your key fob. The key fob can also be damaged if exposed to salt water or water. Water can damage the rubber seals of the electronic chip especially when the key fob has been submerged in water for a lengthy time. The chip may stop working and require replacement of the keyfob. If you have a key that is able to be programmed or programmed, you can clean it with isopropyl or electronic cleaners to bring it back to its original function. If this does nothing you can be sure that the chip is fried and must be replaced. Locking and Unlocking the Doors The key fob's buttons send electronic signals to a solenoid in the car, which converts that signal into mechanical action that locks and unlocks the doors. If your door lock does not work it could be due to an issue with the solenoid. This requires professionals from auto repair shops to examine. A dead 12 volt battery could cause the fob to stop working effectively. This can occur if your battery is not charged or if your contacts get damaged. The problem can be addressed within a few minutes using a new battery. The receiver module could be the cause if the key fob won't work after you replace the battery or re-program the device. This device receives radio frequency signals from the key fob and interprets them to control the vehicle's functions. If it breaks down it could be costly to repair. To determine if this is correct, place your spare key in the key slot. Then turn the ignition on. Press the key fob two times within 10 seconds, but without taking it out. The Mazda 3 system synchronizes the key to the vehicle and you can use it as your primary remote for driving. This allows you to program up three keys.