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Changing the Battery in Your Mazda 3 Key Fob It is frustrating to get in your car at the conclusion of a long and tiring day and find that the key fob is dead. Luckily, this is an easy fix by purchasing simple battery replacement from an hardware store or a big box retailer. The addition of a spare key fob to your Mazda 3 can be an inexpensive way to save yourself from the hassle of being transported to a dealership and having them reprogram 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 replace the battery if it goes out of service, or if the key fob shows a message on the multi-information display that reads, “Low key fob battery. Replace battery.” You'll need a flathead screwdriver, tape and patience to open the case. Place the flathead screwdriver's head in a notch or gap on the bottom metal of the Mazda 3 key fob to take off the lower portion. Repeat this process for the top metal part 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. Use the flathead screwdriver with tape to gently open the case, beginning at one end and moving to the next. Remove the battery that was used and place in the new CR2025 to ensure that it's in the right orientation for proper orientation. Install the cap on the battery again, and then attach both sides of your key fob case by pressing until they click. Once you've replaced your battery Test the fob to verify that it's working by locking and unlocking your doors. If everything is in order then you're able to use the Mazda 3's remote features for the first time! Pairing Issues If your key fob stop functioning suddenly it could mean that the transmitter inside your car has been damaged. It's usually a task for a professional and you will require a new key fob. If you've tried replacing the battery and programming the key fob, but it isn't solving the issue it could be that the chip inside the key fob could be damaged. This could happen if the keyfob was dropped or exposed to saltwater or touched by dirty fingers. You'll need to locate the tiny “key”, which is inserted into the seam, to take off the circuit board to identify the problem. You can then examine the chip for damage or corrosion. To prevent damaging the chip, it is best to use a fresh paper towel. You can also inspect the battery connector's terminals and examine if they're cracked or broken. If this is the case, carefully attaching them back can generally restore the functionality of the key fob. Also, you can check the buttons to see whether they've been worn out or damaged. If the buttons are loose, they can be soldered back and also if the button is actually snapped off. Interference Signals There's nothing more frustrating than trying to get the engine started in your vehicle and getting the message “No Fob Detected”. This can happen at the most inconvenient possible times, like when you're late for work or you're trying to collect your children from daycare/school. mazda key replacement is that there are a few steps you can take to investigate the issue and determine what is causing it. Interference signals can disrupt the remote key fob signal from the vehicle, causing it to not work correctly. This can be caused from things like weather conditions, buildings, as well as transmitters operating on the same frequency. Interference may also occur if you have an aftermarket device installed in the vehicle that transmits on the same frequency as the key fob. The key fob can also be damaged if it is exposed to salt water or water. The rubber seals on the electronic chip can be penetrated by water, especially in the event that it is submerged for an extended period of time, such as in a pool or ocean at the beach. The chip can stop working and require replacement of the keyfob. If you have a programable 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 to be damaged and will need to be replaced. Locking/Unlocking of the Doors The buttons on the key fob send electronic signals to the solenoid of the car, which then converts the signal into mechanical action. It locks and unlocks doors. If the door lock is not working, the issue could be due to a solenoid problem that requires investigation with the help of an expert auto repair shop. A dead 12 volt could cause the fob to stop functioning effectively. This can occur if your battery loses its charge or if the contacts become damaged. The good news is that a new battery can fix this problem in just minutes. The receiver module may be the problem if the key fob doesn't work after replacing the battery or re-program the device. This device detects radio frequency signals sent by the key fob to control the vehicle. It can be expensive to repair if the device becomes defective. To determine if this is the case, begin by inserting the spare key into the key slot and turning the ignition to ON. Press the key fob button three times within 10 seconds without removing it. The Mazda 3 system will now connect the key to the car and you can use it as your primary remote for driving. This lets you program up three keys.