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Changing the Battery in Your Mazda 3 Key FobThere’s nothing more frustrating than getting to your car after a long and tiring day and discovering that your key fob battery is dead. Luckily, this is an easy fix using a simple battery replacement from the hardware store or big box retailer.Adding a spare key fob to your Mazda 3 can be an inexpensive way to save yourself from the hassle of being taken to the dealer and having them re-program your keys.Battery ReplacementChanging the battery in the Mazda 3 key fob is an easy task that you can do at home. However, you should replace the battery when it goes out of service, or if the key fob shows a message on the multi-information display stating, “Low key fob battery. Replace battery.”You’ll need to use a flathead screwdriver and tape and patience to open the case. Insert the flathead screwdriver’s tip in a notch, or gap in the bottom part 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 scratch the rubber ring at the bottom of the case.There’s a slot on the opposite side of the case, which houses the battery. Start on the other side of the case and then gently pry it open. Remove the battery that was used and place in a new CR2025 and make sure it’s facing upwards to ensure the correct polarity. Then, put the cap of the battery back on and reattach both sides of the key fob case, pressing until you hear them click.Now that you’ve replaced the battery Check the fob to verify that it functions by locking and unlocking your doors. If everything appears to be working then your Mazda 3 remote features can be used again.Pairing IssuesIf your key fob has stopped working suddenly it could mean that the transmitter in the car is damaged. It’s usually a job for a professional and you will require a new key fob.If you’ve tried to change the battery and reprogramme the key fob, but it’s not working, the chip inside the key fob could be defective. This can happen if the key fob was dropped on hard surfaces or exposed to salt water, or even touched by dirty hands.To determine the cause of the issue, you will need to find a small “key” embedded in the seam of the fob that allows you to open it up and take out the circuit board. Then, you will be able to check for any corrosion or damage on the electronic chip. To prevent damaging the microchip, it is recommended to clean the chip with a new paper towel.You may also examine the battery connector terminals to examine if they’re cracked or broken. If this is the case then resoldering the terminals into place will typically restore functionality to the key fob. Additionally, you can look at the buttons to see whether they’re worn or damaged. If the buttons are loose, they can be soldered back to their original position unless they have physically snapped.Interference SignalsFew things are more frustrating than glancing at an “No Fob Detected” message when you attempt to start your vehicle. This typically happens at most difficult moments, such as the time you’re late to work or when you are picking up your children from daycare/school. The good news is that there are a few steps you can take to troubleshoot the issue and determine the root of the problem.Interference signals can cause the remote key fob to cease working properly. It can be caused by objects such as weather conditions, buildings, and transmitters using the same frequency. Interference could occur if your vehicle is equipped with aftermarket equipment that transmits at the same frequency as your key fob.In addition, if the key fob is exposed to salt or seawater, it may be damaged. Water can damage the rubber seals of the electronic chip, especially if the key fob is submerged in water for a prolonged duration. This could cause the chip to stop working and may require 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 functionality. If this doesn’t help, it is likely that the chip is fried and will need to be replaced.Locking/unlocking the DoorsThe key fob’s buttons send electronic signals to a solenoid in the car, which transforms the signal into a mechanical action that locks and unlocks doors. If the door lock isn’t working it could be due to an issue with the solenoid. This requires expert auto repair shops to investigate.A dead 12V battery can also stop the fob from functioning effectively. replacement mazda key is the case if the battery loses charge or the contacts become corroded and stop conducting electricity. This issue can be solved within a few minutes using a new battery.The receiver module may be the cause if the key fob isn’t working after you replace the battery or program the device. This device receives radio frequency signals from the key fob and interprets them into controlling the vehicle’s functions. If it breaks down it could be costly to fix.To determine if this is true, place your spare key in the key slot. Then turn the ignition ON. Press the key fob twice in a period of 10 seconds, without taking it out. The Mazda 3 system synchronizes the key with the vehicle and you can now use it as your primary remote for driving. This allows you to program up three keys.