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Changing the Battery in Your Mazda 3 Key Fob It can be a bit frustrating to drive off at the end of a long, hard day and discover that your key fob is dead. This is a straightforward fix that can be done at a major box retailer or at a hardware store. A spare key fob for your Mazda 3 is an inexpensive method to avoid having to take it to a dealership to have them reprogram the keys. Battery Replacement Removing the battery from your Mazda 3 key fob is an easy process that can do at home. You should only replace it when the battery is dead or you notice a message stating “Low keyfob battery” on the multi-information display. Replace battery.” You'll need to use a flathead screwdriver with tape and patience to open the case. Put the head of the flathead screwdriver into a notch, or gap on the bottom of the metal of the Mazda 3 key fob to pry the lower half off. Repeat the process for the top metal piece Be careful not to damage the rubber ring on the bottom of the case. Once the fob case has been opened, you'll notice an opening on either side of the case, which houses the battery. Use the tape-wrapped flathead screwdriver to gently pry the case open, starting with one side and moving to the next. Remove the old CR2025 and replace it with a brand new one, ensuring that you put it on its face to ensure proper direction of polarity. Finally, put the battery cap back on and reattach both sides to 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 ensure whether the fob is working. If everything seems to be in good order, your Mazda 3 remote features can be used again. Pairing Issues This could be a sign that the transmitter in your car has been damaged. This typically requires the assistance of a professional for repair and will likely need a new key fob. If you've tried replacing the battery and reprogram the key fob, but it hasn't worked then the chip in the key fob could be defective. This can happen if your keyfob was dropped or exposed to saltwater or the touch of dirty fingers. You will need to locate an extremely small “key”, which is built into the seam, to remove the circuit board and determine the problem. You will then be able to look for any corrosion or damage on the chip. It is recommended to clean the paper towel to ensure that the chip is not damaged. You may also take a close look at the battery connector's terminals to see if they are damaged or cracked. If this is the case then resoldering the terminals into place can usually restore the functionality of the key fob. It is also possible to check the buttons for damage or wear. If the buttons are loosened, they can be soldered back into place unless one has physically snapped. Interference Signals There are few things more frustrating than trying to get the engine started in your vehicle and getting the message “No Fob Detected”. This usually occurs at the most difficult time, such as when you are late for work or when you have to pick up children from daycare or school. There are several things you can do to find out the root of the issue. Interference signals can cause the remote key fob to cease working in a proper manner. This can be caused by things like weather conditions, buildings, and transmitters that operate on the same frequency. Interference can also occur when you have aftermarket equipment installed in the vehicle that transmits on the same frequency as the key fob. The key fob may also be damaged if exposed to water or salty water. The water can penetrate the rubber seals of the electronic chip especially when the key fob is submerged in water for a lengthy time. The chip may cease to function and require replacement of the keyfob. If you have a key that has the ability to be programmed and cleaned with isopropyl and electronic cleaners to restore its functionality. If this does not work the chip, it is likely fried and will need to be replaced. Locking/Unlocking the Doors The buttons on the keys send electronic signals to a solenoid inside the car. It then transforms the signal into a mechanical action that locks and unlocks the doors. If the door lock is not working, it could be due to a solenoid problem that requires some investigation by a professional auto repair shop. A dead battery of 12 volts can hinder the fob from functioning properly. This can occur if your battery is not charged or if the contacts are damaged. The good news is that a new battery is able to fix this issue in just minutes. If mazda key fob won't work after you have changed the battery or program it again the issue could be in the receiver module. This device interprets radio frequency signals received by the key fob to control the vehicle. It can be expensive to repair if it is damaged. To determine if this is true, place your spare key into the key slot. Then, turn the ignition on. Press the key fob twice in 10 seconds, without removing it. The Mazda 3 system synchronizes the key to the vehicle, and you can use it as your primary remote for driving. This lets you program up three keys.