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Changing the Battery in Your Mazda 3 Key FobThere is nothing more frustrating than stepping into your car after a long day and realizing that the key fob battery is dead. This is a straightforward fix that is easily done at a big box retailer or at a hardware store.A spare key fob for your Mazda 3 is an inexpensive way to avoid having to take it to a dealership to have them reprogram the keys.Battery ReplacementThe battery replacement in your Mazda 3 key fob is an easy task that you can do at home. But, it is best to replace the battery when it fails, or when the key fob displays a message on the multi-information display saying, “Low key fob battery. Replace battery.”You’ll need to use an flathead screwdriver along with tape and patience to open the case. Locate a notch or gap in the bottom part of the metal of the Mazda 3’s key fob and then insert the head of the screwdriver to cut off the lower part. Repeat the procedure for the top piece of metal however, be careful not to damage the rubber ring at the bottom of the case.When the fob case is open, you’ll see the slots on either side of the case, which houses the battery. Use the tape-wrapped flathead screwdriver to gently pry open the case, beginning with one side and moving to the opposite. Take out the old CR2025 and replace it with a new one, making sure you put it on its face to ensure the correct orientation. Then, put the cap back on and reattach both sides of the key fob case. Keep pressing until you hear them click.Once you’ve replaced your battery, test the fob to confirm it functions by locking and unlocking your doors. If everything appears to be working, you can start using your Mazda 3’s remote features on the road again!Pairing IssuesThis could mean that the transmitter inside your car may have been damaged. It is usually a job to a professional and you will require a new key fob.If you’ve tried replacing the battery and programming the key fob, but this isn’t solving the issue, it is possible that the chip inside the key fob may be malfunctioning. This could be the case if the keyfob has been dropped or exposed to saltwater or was touched by dirty fingers.To identify the issue To determine the cause, you must find a small “key” embedded in the seam of the fob which allows you to lift it open and remove the circuit board. Then, you can examine the electronic chip for corrosion or damage. To prevent damaging the chip, it’s recommended to use a clean paper towel.You may also inspect the battery connector’s terminals to check if they’re damaged or cracked. If this is the case, then carefully reconnecting them can usually restore the function of the key fob. You can also examine the buttons for damage or wear. If the buttons are loose they can be soldered back 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 only to see the message “No Fob Detected”. This usually occurs at the most inconvenient times, such as when you are late for work or picking up children from daycare/school. There are some things you can do to find out what’s the cause.Interference signals can affect the remote key fob’s signal to the vehicle making it unable to work correctly. This could be caused by objects like weather conditions, buildings, and transmitters that operate on the same frequency. Interference can occur when your vehicle has aftermarket equipment that transmits at the same frequency as your key fob.The key fob might be damaged if it is exposed to salt water or water. Water can penetrate the rubber seals of the electronic chip especially if the key fob is submerged in water for a lengthy duration. This can cause the chip’s function to cease and will require replacement of the key fob. If you have a programmable key cleaning the chip with isopropyl Alcohol or an electronic cleaner to help it get back to its original functionality. If this doesn’t work then it’s likely that the chip is fried and requires replacement.Locking and unlocking of the DoorsThe buttons on the key fob send 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 is not working, the issue may be a solenoid issue that requires investigation with the help of an expert auto repair shop.A dead 12 volt could also stop the fob from working properly. This could happen if the battery has lost its charge or if the contacts are corrosion-prone. The good news is that a new battery can fix this issue in just minutes.If the key fob doesn’t work after you replace the battery or re-program it the issue could be in the receiver module. mazda spare key receives radio frequency signals from the key fob and interprets them to control the functions of the vehicle. It could be expensive to repair if the device becomes defective.To test if this is true, put your spare key in the key slot. Then turn the ignition ON. Press the key fob twice within 10 seconds, but without removing it. The Mazda 3 system 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 this manner.