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Changing the Battery in Your Mazda 3 Key Fob There's nothing more frustrating than getting to your car after a long day, and discovering that the key fob battery is dead. This is a straightforward fix that can be found at a big box retailer or hardware store. Adding a spare key fob to your Mazda 3 can be an cost-effective way to stay away from having to be transported to a dealership and having them reprogram your keys. Battery Replacement The battery replacement 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 is dead or you get a message that reads “Low keyfob battery” on the multi-information display. Replace battery.” To open the key fob's case You'll need a tape wrapped flathead screwdriver and some patience. Insert the flathead screwdriver's head in a notch or gap on the bottom of the metal of the Mazda 3 key fob to pry the lower half off. Repeat the procedure for the top metal piece Be careful not to damage the rubber ring at the bottom of the case. You'll find a slot on both sides of the fob case that contains the battery. Use the flathead screwdriver with tape to gently pry open the case, starting at one end and moving to the opposite. Remove the battery that was used and place in a new CR2025 to ensure that it's facing upwards to ensure the correct polarity. Attach the cap to the battery again and attach both sides of your key fob case by pressing until they click. After you've replaced the battery Test the fob to make sure it works by locking and unlocking your doors. If everything appears to be working then you can begin using your Mazda 3's remote features to drive again! Pairing Issues This could mean that the transmitter inside your car is damaged. This typically requires the assistance of a professional for repair and may require a new key fob. If you've tried to replace the battery and reprogram the key fob, but it hasn't worked then the chip in the key fob may be defective. This can happen when the key fob has been dropped on hard surfaces or exposed to salt water or even brushed by dirty hands. You'll need to find the small “key”, which is inserted into the seam to remove the circuit board and determine the problem. You can then check the electronic chip for corrosion or damage. To avoid damaging the chip, it is best to use a fresh paper towel. If you're not sure it is possible to check the battery connector's terminals for cracks or broken. If this is the situation then resoldering the terminals into place will typically bring back functionality to the key fob. You can also inspect the buttons for damage or wear. If the buttons are loosened, they can be resoldered to their original position unless they have physically snapped. Interference Signals There's nothing more frustrating than trying to start your car and seeing the message “No Fob Detected”. It happens at the worst occasions, such as the time you're late to work or pick up your children from daycare or school. There are several things you can do to find out what's causing the problem. Interference signals can cause the remote key fob not to function properly. This can be caused by things like buildings, weather conditions and transmitters that operate on the same frequency. Interference can occur when your vehicle is equipped with aftermarket equipment that transmits at the same frequency as your key fob. Additionally, if the key fob is exposed to water or salt the water, it might be damaged. The rubber seals on the electronic chip can be damaged by water, especially when it is submerged for an extended period of time, like in a swimming pool or at the beach. This can cause the chip to stop functioning and may require replacement of the key fob. If you have a key that can be programmed and cleaned with isopropyl and electronic cleaners to bring it back to its original functionality. If this does nothing, it is likely that the chip has been damaged and requires replacement. Locking and Unlocking of Doors The buttons on the key fob send electronic signals to the solenoid inside the car. It then converts the signal into a mechanical action that locks and unlocks doors. If mazda 3 key fob isn't 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 battery could cause the fob to stop functioning effectively. This could happen if the battery's charge is lost or if the contacts become corroded and stop conducting electricity. This problem can be fixed within a few minutes using a new battery. If the key fob isn't working after you have changed the battery or re-program it then the problem may be with the receiver module. This device interprets radio frequency signals transmitted by the key fob to control the vehicle. If it fails it could be costly to repair. To verify if this is correct, place your spare key in the key slot. Then turn the ignition on. Press the key fob twice for 10 seconds without removing it. The Mazda 3 system synchronizes the key to the vehicle, and you can now use it as your primary driving remote. You can program up to three keys in this manner.