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Changing the Battery in Your Mazda 3 Key Fob There's nothing more annoying than getting to your vehicle after a long day and realizing that the key fob battery is dead. This is a straightforward fix that can be found at a big box retailer or hardware store. The addition of a spare key fob to your Mazda 3 can be an affordable way to keep yourself from having to be driven to the dealership and having them re-program your keys. Battery Replacement The battery replacement in your Mazda 3 key fob is an easy process that can do at home. But, it is best to replace the battery if it is dead, or if the key fob shows a message on the multi-information display that reads, “Low key fob battery. Replace battery.” To open the key fob's case you'll need a tape-wrapped flathead screwdriver, along with some patience. Insert the head of the flathead screwdriver in a notch, or gap on the bottom of the metal of the Mazda 3 key fob to cut off the lower half. Repeat this procedure for the top portion of the metal but be careful not to scratch the rubber ring at the bottom of the key fob's case. There's a slot on each side of the fob case, where you can find the battery. Start on the other side of the case, and then gently lift it up. Remove the old battery and then put in a new CR2025 to ensure that it's facing upwards to ensure proper orientation. Put the cap of the battery on again and secure both sides of your key fob case by pressing until they click. Now that you've replaced the battery, test the fob to confirm it works by locking and unlocking your doors. If everything looks good, your Mazda 3 remote features can be used again. Pairing Issues If your key fob has stopped functioning suddenly it could be a sign that the transmitter inside your car has been damaged. It is typically a need for a professional to repair and will likely 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 may be defective. This could happen if the key fob has been dropped on hard surfaces and exposed to salt water, or even touched by dirty hands. You'll need to find the small “key”, which is built into the seam, to remove the circuit board and identify the issue. Then, you can check the chip for damage or corrosion. It is best to use a clean towel to keep the microchip from being damaged. You may also inspect the battery connector's terminals and determine if they're damaged or cracked. If this is the case, then carefully connecting them back can often restore the function of the key fob. Similarly, you can inspect the buttons to see whether they are worn out or damaged. If they are loose, they can be resoldered into place, unless one has physically snapped. Interference Signals There are few things more frustrating than glancing at an “No Fob Detected” message when you attempt to start your car. It typically happens at most inconvenient moments, such as when you're late for work or picking up children from school/daycare. The good thing is that there are steps you can take to pinpoint the issue and determine the root of the problem. Interference signals can affect the remote key fob signal from the vehicle, causing it to not work correctly. This can be caused by things such as weather conditions, buildings, and transmitters that use the same frequency. Interference could also occur if you have aftermarket equipment installed in your vehicle that transmits on the same frequency as the key fob. In addition, if your key fob is exposed to salt or the water, it might be damaged. The water can penetrate the rubber seals of the electronic chip, especially if the key fob is submerged in water for an extended duration. This could cause the chip's function to cease and require replacement of the key fob. If you have a programable key it is possible to clean the chip with isopropyl alcohol or an electronic cleaner to help it return to functionality. If this does nothing, it is likely that the chip is fried and needs to be replaced. Locking/unlocking the Doors The buttons on the keys send electronic signals to a solenoid in the car. It converts the signal into a mechanical action that locks and unlocks doors. If the door lock isn't working, it could be a solenoid issue that requires some analysis with the help of an expert repair shop for autos. A dead 12 volt battery could cause the fob to stop functioning effectively. This is the case if the battery loses its charge or if the contacts become corroded and stop conducting electricity. mazda 2 spare key can be fixed within a few minutes using a new battery. If the key fob isn't working after changing the battery or reprogram it then the problem may be with the receiver module. The device receives radio frequency signals from the key fob and interprets them to control the functions of the vehicle. It can be expensive to repair if it malfunctions. To check whether this is the case, start by putting your spare key into the key slot and setting the ignition to ON. Press the key fob button twice within 10 seconds without taking it. The Mazda 3 system synchronizes the key to the vehicle, and you can now use it as your primary remote for driving. You can program up to three keys this way.