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Changing the Battery in Your Mazda 3 Key Fob It can be a bit frustrating to drive off at the end of a long, hard day and discover that the key fob is dead. Luckily, it's simple to fix it with simple battery replacement from a hardware store or big box retailer. A spare key fob for your Mazda 3 is an inexpensive option to not have to be towed to a dealership to have them re-program your keys. Battery Replacement Change the battery in your Mazda 3 key fob is an easy procedure that you can perform at home. It is recommended to replace it when the battery fails or you see a message saying “Low keyfob battery” on the multi-information display. Replace battery.” To open the key fob case, you'll need a tape-wrapped flathead screwdriver as well as some patience. Find a gap or notch in the bottom of the metal part of your Mazda 3's key fob, and insert the head of the screwdriver to break off the lower half. Repeat this step for the top metal part however, be careful not to damage the rubber ring that is at the bottom of the key fob's case. You'll find a slot on the opposite side of the case that contains the battery. Use the tape-wrapped flathead screwdriver to gently pry open the case, beginning with one side and shifting to the other. Take out the old CR2025 and replace it with a brand new one, making sure to put it on its face to ensure the correct the polarity. Attach the cap to the battery again and secure both sides of your key fob case by pressing until they click. Once you've replaced your battery Check the fob to make sure it functions by locking and unlocking your doors. If replacement mazda key seems to be in good order then your Mazda 3 remote features can be used again. Pairing Issues This could mean that the transmitter inside your car is damaged. It is usually a job that requires a professional. You will require a brand new key fob. If you have tried replacing the battery and programming the key fob, but this isn't solving the issue it is possible the chip in the key fob could be defective. This could happen if the keyfob was dropped or exposed to saltwater or touched by dirty fingers. You will need to locate the small “key” that is built into the seam to remove the circuit board to identify the issue. You can then check the electronic chip for damage or corrosion. To prevent damaging the chip, it is best to use a fresh paper towel. You may also take a closer look at the battery connector's terminals to examine if they're cracked or broken. If this is the case, carefully soldering them back in place can usually restore the function of the key fob. Additionally, you can look at the buttons to see whether they are worn out or damaged. If the buttons are loosened, they can be soldered back into place, unless one has physically snapped. Interference Signals Few things are more annoying than looking at an “No Fob Detected” message when trying to start your vehicle. This usually occurs at the most unpopular times, such as when you're running late for work or picking up children from daycare/school. The good news is that there are steps you can take to investigate the issue and figure out what is causing it. Interference signals can affect the remote key fob signal coming from the vehicle making it unable to work correctly. This could be caused by objects like buildings, weather conditions, and transmitters that operate on the same frequency. Interference could occur if 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 damage the rubber seals of the electronic chip, especially when the key fob is submerged in water for an extended duration. This could cause the chip to stop working and will require replacement of the key fob. If you have a programmable key, you can clean the chip using isopropyl alcohol or an electronic cleaner to help it come back to normal. If this doesn't help you can be sure that the chip has fried and requires replacement. Locking or Unlocking the Doors The buttons on the key fob send electronic signals to the solenoid in the car, which transforms the signal into mechanical action. It locks and unlocks doors. If your door lock fails to work it could be because of an issue with the solenoid. This will require professional repair shops to analyze. A low-voltage battery can cause the fob to stop functioning properly. This can happen if the battery is unable to charge or if the contacts get corroded and stop transferring 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 won't work after you replace the battery or re-program the device. The device interprets radio frequency signals transmitted by the key fob to control the vehicle. If it malfunctions it could cost a lot to repair. To check if this is the case, start by inserting your spare key into the key slot and setting the ignition to ON. Press the key fob button three times within 10 seconds without taking it. The Mazda 3 system synchronizes the key with the vehicle and you can now use it as your primary driving remote. This allows you to program up to three keys.