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Changing the Battery in Your Mazda 3 Key Fob It is frustrating to drive off at the end of a long day and discover that your key fob is dead. Fortunately, it is an easy fix with an easy battery replacement at an hardware store or a big box retailer. A spare key fob to your Mazda 3 can be an affordable way to keep yourself from having to be taken to the dealer and having them reprogram your keys. Battery Replacement Removing the battery from the Mazda 3 key fob is an easy task that you can perform at home. But, you should only replace the battery when it is dead, or if the key fob displays a message in the multi-information display, “Low key fob battery. Replace battery.” You'll need to use a flathead screwdriver with tape and patience to open the case. Place the head of the flathead screwdriver in a notch, or gap on the bottom metal of the Mazda 3 key fob to remove the lower part. Repeat the process for the top piece of metal however, be careful not to damage the rubber ring at the bottom of the case. You'll find a slot on each side of the case, which houses the battery. Start on one side of the case and then gently pry it open. Remove the old battery, and put in the new CR2025, making sure that it's facing up to ensure proper orientation. Attach the cap to the battery 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's working by locking and unlocking your doors. If everything appears to be working you're now able to use the Mazda 3's remote features in the road! Pairing Issues If your key fob stops working suddenly it could mean that the transmitter in the car is damaged. It is usually a job that requires a professional. You will need a new key fob. If you have tried replacing the battery and programming the key fob but isn't solving the issue it is possible the chip in the key fob might be defective. This could be the case if the keyfob was dropped, exposed to saltwater, or touched by dirty fingers. You'll need to locate an extremely small “key”, which is built into the seam, to remove the circuit board to identify the problem. Then, you can check the chip for corrosion or damage. It is recommended to clean the paper towel to keep the microchip from being damaged. If you aren't sure you are not sure, you can check the battery connector's terminals for cracks or broken. If this is the case you can solder the terminals back to their original position will usually restore functionality to the key fob. You can also inspect the buttons for damage or wear. If the buttons are loose, they can be resoldered into place, unless one has physically snapped. Interference Signals There are few things more frustrating than trying to start your vehicle and getting the message “No Fob Detected”. This typically happens at most inconvenient moments, like when you're running late for work or when you are picking up your children from daycare or school. mazda 2 car key G28CarKeys is that there are a few steps you can take to pinpoint the issue and determine the cause. Interference signals can cause the remote key fob to stop functioning properly. This could be caused by objects such as weather conditions, buildings, and transmitters that use the same frequency. Interference can occur if your vehicle is equipped with aftermarket equipment that transmits at the same frequency as your key fob. The key fob may also be damaged if it is exposed to salt water or water. The water can penetrate the rubber seals of the electronic chip especially in the event that the key fob is submerged in water for a prolonged duration. The chip may stop working and may require replacement of the keyfob. If you have a programmeable key cleaning the chip using isopropyl alcohol or an electronic cleaner to aid in its return to working. If this doesn't help then it's likely that the chip has fried and must be replaced. Locking or Unlocking the Doors The buttons on the key fob send electronic signals to the solenoid of the car, which then converts this signal into mechanical action. It locks and unlocks doors. If the door lock isn't working it could be due to an issue with the solenoid. This will require expert auto repair shops to examine. A dead 12V battery can cause the fob to stop functioning effectively. This can happen if the battery loses its charge or if the contacts become corroded, and stop transferring electricity. The good news is that a new battery can fix this problem in just minutes. The receiver module could be the problem if the key fob won't work after replacing the battery or reprogram the device. This device interprets radio frequency signals received by the key fob to control the vehicle. If it fails it could be costly to fix. To check if this is the case, start by putting your spare key into the key slot and setting the ignition to ON. Press the key fob twice within 10 seconds without removing it. The Mazda 3 system synchronizes the key with the vehicle and you can now use it as your primary remote for driving. You can program up to three keys this manner.