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Changing the Battery in Your Mazda 3 Key Fob It is frustrating to get into your car at the conclusion of a long and tiring day and discover that the key fob is dead. This is a straightforward fix that is easily done at a major box retailer or hardware store. The addition of a spare key fob to your Mazda 3 can be an affordable solution to free yourself from the hassle of being towed to the dealership and having them re-program your keys. Battery Replacement Changing the battery in the Mazda 3 key fob is an easy procedure that you can do at home. However, you should only replace the battery when it goes out of service, or if the key fob displays a message in the multi-information display that reads, “Low key fob battery. 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 part of the metal of your Mazda 3's key fob and then insert the tip of the screwdriver to cut off the lower half. Repeat the process for the top part of the metal however, be careful not to damage the rubber ring that is at the bottom of the key fob's case. Once the fob's case is open, you'll be able to see a slot on either side of the case, which houses the battery. Start on the opposite side of the case and then gently pry it open. Take out the old CR2025 and replace it with a new one, making sure you place it face-up to ensure the correct orientation. Place the battery cap on again, and then attach both sides of your key fob case by pressing until they click. After replacing the battery Lock and unlock your doors to test whether the fob is working. If everything is in order then you're able to use your Mazda 3's remote capabilities for the first time! Pairing Issues If your key fob stop working all of a sudden it could be a sign that the transmitter inside the car has been damaged. It's usually a task to 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 hasn't worked then the chip in the key fob could be faulty. This can happen if the keyfob was dropped or exposed to saltwater or touched by dirty fingers. You'll need to find the tiny “key”, which is inserted into the seam, to take off the circuit board and determine the issue. Then, you will be able to check for any corrosion or damage on the electronic chip. It is recommended to use a clean, dry paper towel to avoid damaging the microchip. If you are unsure, you can also check the battery connector's terminals for cracks or broken. If this is the case, carefully reconnecting them can often restore the function of the key fob. You can also check the buttons for damage or wear. If the buttons are loose they can be soldered back into position, unless they've physically snapped. Interference Signals There is nothing more frustrating than looking at the “No Fob Detected” message when you attempt to start your car. It can happen at the most unfavorable occasions, such as when you're late to work or when you have to pick up your children from daycare or school. The good news is that there are steps you can follow to resolve the issue and determine the cause. Interference signals can cause the remote key fob to cease working in a proper manner. It can be caused by objects such as weather conditions, buildings, as well as transmitters operating on the same frequency. Interference can also occur when you have an aftermarket device installed in the vehicle that transmits on the same frequency as the key fob. The key fob could be damaged if exposed to water or salty water. The rubber seals on the electronic chip could be penetrated by water, particularly when it is submerged over long periods of time, like in a pool or ocean at the beach. This can cause the chip's function to cease and require replacement of the key fob. If you have a key that can be programmed and cleaned with isopropyl and electronic cleaners to bring it back to its original function. If this does not work the chip, it's likely fried and will need to be replaced. Locking and Unlocking of Doors The buttons on the key fob send electronic signals to the solenoid of the car, which then converts this signal into mechanical action. This locks and unlocks doors. If mazda key cut does not work it could be because of 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 working effectively. This can happen if the battery's charge is lost, or if the contacts are corroded and stop transmitting electricity. The problem can be addressed in just a few minutes by purchasing a new battery. The receiver module could be the cause of the issue if the key fob won't work after you replace the battery or program the device. The device receives radio frequency signals from the key fob and interprets them to control the functions of the vehicle. It could be a costly repair if it becomes faulty. To determine whether this is the case, begin by inserting the spare key into the key slot and turning the ignition to 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 now use it as your primary driving remote. This lets you program up to three keys.