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Changing the Battery in Your Mazda 3 Key FobIt's frustrating to drive off at the end of a long workday and discover that the key fob is dead. Luckily, this is simple to fix it with simple battery replacement from an electronics store or big box retailer.A spare key fob to your Mazda 3 can be an affordable way to keep yourself from having to be transported to a dealership and having them reprogram your keys.Battery ReplacementChange the battery in your Mazda 3 key fob is an easy process that can perform at home. You should only replace it if the battery goes out or if you see a message saying "Low keyfob battery" on the multi-information display. Replace battery."To open the case of your key fob, you'll need a tape-wrapped flathead screwdriver as well as some patience. Place the flathead screwdriver's tip in a notch or gap, on the bottom metal of the Mazda 3 key fob to take off the lower portion. Repeat the procedure for the top piece of metal, but be sure not to damage the rubber ring at the bottom of the case.You'll find a slot on the opposite side of the case that houses the battery. Start with one side of the case, and then gently push it open. Take out blog and replace it with a brand new one, making sure you place it face-up to ensure the correct the polarity. Finally, place the cap on the battery and reattach both sides of the key fob case, pressing until you hear them click.After replacing the battery Lock and unlock your doors to confirm whether the fob works. If everything looks good you're now able to use your Mazda 3's remote features to drive again!Pairing IssuesThis could be a sign that the transmitter in your car has been damaged. This is usually a matter that requires a professional. You will require a brand new key fob.If you have tried replacing the battery and programming the key fob, but it did not resolve the issue it is possible the chip in the key fob may be malfunctioning. This can happen when the key fob has been dropped on hard surfaces or exposed to salt water or even brushed by dirty hands.You'll need to find the small "key", which is inserted into the seam to remove the circuit board and determine the issue. Then, you will be able to look for any damage or corrosion on the chip. It is recommended to clean the paper towel to keep the microchip from being damaged.If you aren't sure it is possible to check the battery connector's terminals for cracks, or breaks. If this is the situation, soldering the terminals back into place can usually restore functionality to the key fob. In the same way, you can examine the buttons to see if they are worn or damaged. If the buttons are loose, they can be soldered back in place as well unless the button has actually snapped off.Interference SignalsThere's nothing more frustrating than trying to start your vehicle and getting the message "No Fob Detected". This typically happens at most unpopular moments, like when you are late for work or when you have to pick up children from daycare or school. There are several things you can try to figure out what's the cause.Interference signals can cause the remote key fob not to function in a proper manner. This can be caused from objects such as weather conditions, buildings and transmitters using the same frequency. Interference can also occur when you have an aftermarket device installed in the vehicle that transmits on the same frequency as the key fob.The key fob could be damaged if exposed to salt water or water. Water can get into the rubber seals of the electronic chip especially in the event that the key fob is submerged in water for a long duration. This could cause the chip to stop working, requiring replacement of the key fob. If you have a key which can be programmed to work, you can clean it with isopropyl or electronic cleaners to restore its function. If this doesn't work the chip, it's likely fried and will need to be replaced.Locking/unlocking the DoorsThe buttons on the key fob transmit 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 functioning, the issue could be a solenoid malfunction that requires analysis with the help of an expert repair shop for autos.A dead 12 volt can also stop the fob from working effectively. This could happen if the battery loses its charge or if the contactors get corroded and stop transferring electricity. The good news is that a new battery can fix this issue in just minutes.If the key fob isn't working after changing the battery or try to program it again the issue could be with the receiver module. The device receives radio frequency signals from the key fob and interprets them to control the vehicle's functions. It can be a costly repair if it is damaged.To determine whether this is the case, begin by inserting the spare key into the key slot and turning the ignition to ON. Press the key fob two times in 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 this manner.