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Changing the Battery in Your Mazda 3 Key Fob It can be a bit frustrating to pull into your car at the conclusion of a long and tiring day and discover that the key fob is dead. Luckily, this is an easy fix with a simple battery replacement from an hardware store or a big box retailer. A spare key fob for your Mazda 3 is an inexpensive method to avoid having to take it by a dealership to let them reprogram the keys. Battery Replacement You can replace the battery on your Mazda 3 keyfob at home. But, it is best to replace the battery if 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 with tape and patience to open the case. Locate a notch or gap in the bottom portion of the metal of the Mazda 3's key fob and then insert the head of the screwdriver to pry off the lower portion. Repeat this step for the top metal piece but be careful not to scratch the rubber ring at the bottom of the key fob's case. Once the fob's case is opened, you'll notice a slot on either side of the case that 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, ensuring that you place it face-up to ensure proper the polarity. Then, put the cap back on and reattach both sides of the key fob case. Keep pressing until you hear them click. After replacing the battery Lock and unlock your doors to verify whether the fob is working. If everything appears to be working the Mazda 3 remote features can be used again. Pairing Issues This could mean that the transmitter in your car is damaged. This typically requires the assistance of a professional for repair and may need a new key fob. If you have tried replacing the battery and programming the key fob, but it isn't solving the issue it could be that the chip in the key fob might be faulty. This can occur if the key fob has been 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” built into the seam of the fob that lets you open it up and take out the circuit board. You will then be able to check for any corrosion or damage on the electronic chip. To avoid damaging the chip, it's recommended to use a clean paper towel. You can also take a closer look at the battery connector's terminals to examine if they're damaged or cracked. If this is the case, soldering the terminals back into place can usually restore the functionality of the key fob. Additionally, you can look at the buttons to see whether they are worn out or damaged. If the buttons are loose, they can easily be soldered back into place in the event that a button has physically snapped off. mazda replacement key cost There are few things more frustrating than gazing at an “No Fob Detected” message when trying to start your vehicle. It can happen at the most unfavorable possible times, like when you're late for work or pick up your children from daycare or school. There are a few things you can do to find out the root of the issue. Interference signals can cause the remote key fob not to function properly. This could be caused by objects like weather conditions, buildings, and transmitters that use the same frequency. Interference may 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 water or salt seawater, it may be damaged. The rubber seals on the electronic chip could be penetrated by water, particularly when it is submerged over an extended period of time such as in a pool or at the beach. The chip could stop working and may require replacement of the keyfob. If you own a programmable key you can clean the chip using isopropyl alcohol or an electronic cleaner to help it return to functionality. If this doesn't work, the chip is likely fried and will need to be replaced. Locking and Unlocking the Doors The key fob's buttons send electronic signals to a solenoid inside the car that then converts the signal into a mechanical action that locks and unlocks doors. If the door lock is not functioning, the issue could be due to a solenoid problem that requires analysis with the help of an expert auto repair shop. A dead 12 volt can also hinder the fob from working properly. This could happen if your battery is not charged or if the contacts become corroded. The good news is that a new battery is able to solve this issue in only minutes. The receiver module may be the cause of the issue if the key fob does not function after you replace batteries or reprogram the device. This device interprets radio frequency signals received by the key fob to control the vehicle. If it malfunctions it could cost a lot to fix. To test if this is correct, place your spare key into the key slot. Then turn the ignition ON. Press the key fob button twice within 10 seconds, without removing it. The Mazda 3 system synchronizes the key with the vehicle and you can use it as your primary driving remote. This lets you program up three keys.