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Changing the Battery in Your Mazda 3 Key Fob There's nothing more annoying than stepping into your vehicle after a long day, and realizing that the key fob battery is dead. This is a straightforward fix that is easily done at a major box retailer or hardware store. A spare key fob for your Mazda 3 is an inexpensive option to not have to take it by a dealership to let them reprogram the keys. Battery Replacement You can replace the battery on your Mazda 3 keyfob at home. It is recommended to replace it if the battery is dead or you see a message saying “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. Locate a notch or gap in the bottom of the metal part of the Mazda 3's key fob, and then insert the tip of the screwdriver in it to cut off the lower part. Repeat the procedure for the top metal piece, but be sure not to damage the rubber ring that is on the bottom of the case. Once the fob case is open, you'll find an opening on either side of the case that houses the battery. Use the tape-wrapped flathead screwdriver to gently pry the case open, beginning at one end and shifting to the other. Remove the old battery, and put in the new CR2025, making sure that it's facing up to ensure the correct orientation. Finally, place the cap on the battery and then reattach both sides of the key fob's case. Continue pressing until you hear them click. After replacing the battery, test the fob to confirm it works by locking and unlocking your doors. If everything looks good you're now able to use your Mazda 3's remote capabilities for the first time! Pairing Issues This could mean that the transmitter in your car may have been damaged. This usually requires a professional to repair and will likely require a replacement key fob. If you've tried replacing the battery and reprogram the key fob, but it hasn't worked the chip inside the key fob might be defective. This can happen if the key fob has been dropped on hard surfaces or exposed to salt water or even touched by dirty hands. To diagnose this issue To determine the cause, you must find a small “key” embedded in the seam of the fob which allows you to take it apart and take out the circuit board. Then, you can check the chip for damage or corrosion. It is best to use a clean, dry paper 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 breakage. If this is the case, carefully soldering them back in place can often restore the function 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 soldered back as well unless the button is physically snapped off. Interference Signals There is nothing more frustrating than glancing at a “No Fob Detected” message when you attempt to start your vehicle. It typically happens at most awkward moments, 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 help figure out what's causing the issue. Interference signals can cause the remote key fob to stop functioning in a proper manner. It can be caused by objects such as weather conditions, buildings, and transmitters using the same frequency. Interference can also occur when you install aftermarket equipment in your vehicle that transmits on the same frequency as the key fob. The key fob can also be damaged if it is exposed to salt water or water. Water can get into the rubber seals of the electronic chip especially when the key fob has been submerged in water for a prolonged time. The chip may cease to function and require replacement of the keyfob. If you own a programmable key you can clean the chip with isopropyl alcohol or an electronic cleaner to help it return to functionality. If this does not help the chip, it's likely fried and will need to be replaced. Locking and Unlocking of Doors The buttons on the key fob transmit electronic signals to a solenoid in the car that then converts that signal into a mechanical action that locks and unlocks the doors. If your door lock isn't working it could be due to an issue with the solenoid. This will require experts from repair shops to look into. A dead 12 volt battery could also stop the fob from functioning properly. This happens when the battery is unable to charge, or if the contacts become corroded and stop conducting electricity. The problem can be addressed in a matter of minutes by replacing the battery. The receiver module could be the cause of the issue if the key fob does not function after replacing the battery or program the device. The device receives radio frequency signals from the key fob and interprets them into controlling the vehicle's functions. mazda 2 key fob could be a costly repair if it becomes faulty. To verify if this is true, place your spare key into the key slot. Then turn the ignition on. Press the key fob two times in 10 seconds, without taking it out. The Mazda 3 system will now synchronize the key with the vehicle and you can then use it as your primary remote for driving. You can program up to three keys this way.