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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 discovering that your key fob battery is dead. Fortunately, it is an easy fix by purchasing the simple replacement of a battery at a hardware store or big box retailer.The addition of a spare key fob to your Mazda 3 can be an cost-effective way to stay away from having to be taken to the dealer and having them reprogram your keys.Battery ReplacementRemoving the battery from your Mazda 3 key fob is an easy procedure that you can perform at home. But, you should only replace the battery if it fails, or when the key fob displays a message on the multi-information display that reads, “Low key fob battery. Replace battery.”You’ll need a flathead screwdriver, tape and patience to open the case. Put the flathead screwdriver’s head in a notch, or gap, on the bottom metal of the Mazda 3 key fob to remove the lower part. Repeat the process for the top metal piece Be careful not to scratch the rubber ring that is on the bottom of the case.There’s a slot on both sides of the fob case that houses the battery. Make use of the tape-wrapped flathead screwdriver to gently pry open the case, beginning on one side and then moving to the opposite. Take out the old CR2025 and replace it with a brand new one, making sure you place it face-up to ensure the correct polarity. Then, put the battery cap back on and then reattach both sides of the key fob’s case. Continue pressing until you hear them click.After replacing the battery Lock and unlock your doors to confirm that the fob is working. If everything looks good, your Mazda 3 remote features can be used again.Pairing IssuesThis could mean 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 programming the key fob but isn’t solving the issue it is possible that the chip in the key fob might be faulty. This can occur if the key fob was dropped on hard surfaces or exposed to saltwater, or even touched by dirty hands.To diagnose this issue, you will need to find a small “key” located in the fob’s seam which allows you to take it apart and remove the circuit board. Then, you will be able to examine for any corrosion or damage on the chip. To prevent damaging the microchip, it is best to use a fresh paper towel.If you are unsure it is possible to check the battery connector terminals for cracks or breaks. If this is the case it is possible to solder the terminals back into place will typically restore the functionality of the key fob. You can also check the buttons for wear or damage. If the buttons are loose, they can be resoldered to their original position unless they have physically snapped.Interference SignalsThere’s nothing more frustrating than trying to get the engine started in your car and then seeing the message “No Fob Detected”. It happens at the worst possible times, like the time you’re late to work or when you have to pick up your children from daycare/school. The good thing is that there are steps you can take to pinpoint the issue and figure out what is causing it.Interference signals can affect the remote key fob’s signal to the vehicle, causing it to not work properly. This could be caused by objects like buildings, weather conditions and transmitters that use the same frequency. Interference may occur if your vehicle is equipped with aftermarket equipment that transmits at the same frequency as your key fob.Additionally, if the key fob is exposed to water or salt water it may be damaged. The rubber seals on the electronic chip could be damaged by water, particularly in the event that it is submerged for long periods of time like in a swimming pool or at the beach. The chip may stop working and require replacement of the keyfob. If you have a key that has the ability to be programmed, you can clean it using isopropyl or electronic cleaners to bring it back to its original functionality. If this doesn’t help then it’s likely that the chip has burned out and requires replacement.Locking and Unlocking of DoorsThe buttons on the key fob transmit electronic signals to the solenoid of the car, which then transforms the signal into mechanical action. It locks and unlocks doors. If the door lock isn’t working, the problem could be due to a solenoid problem that requires investigation by an expert repair shop for autos.A dead 12V battery can also stop the fob from working properly. This happens when the battery loses its charge or if the contactors become corroded and stop conducting electricity. This problem can be fixed in a matter of minutes by replacing the battery.If the key fob doesn’t work after changing the battery or try to reprogram it the problem could be in the receiver module. This device interprets radio frequency signals received by the key fob to control the vehicle. If it malfunctions it could be costly to fix.To check if this is the case, start by inserting your spare keys into the key slot and setting the ignition to ON. Press the key fob twice in 10 seconds, without taking it out. replace mazda key will now connect the key to the car and you can use it as your primary remote for driving. You can program up to three keys in this manner.