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Changing battery for mazda 2 key in Your Mazda 3 Key Fob There's nothing more frustrating than getting to your car after a long day, and finding that the key fob battery is dead. This is a straightforward fix that can be done at a major box retailer or at a hardware store. Incorporating 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 You can replace the battery on your Mazda 3 keyfob at home. It is recommended to replace it if the battery dies or if you notice a message stating “Low keyfob battery” on the multi-information display. Replace battery.” To open the key fob's casing you'll need a tape-wrapped flathead screwdriver as well as some patience. Locate a notch or gap in the bottom portion of the metal of your Mazda 3's key fob and then insert the head of the screwdriver to pry off the lower part. Repeat the procedure for the top piece of metal however, be careful not to scratch the rubber ring at the bottom of the case. There's a slot each side of the fob case that contains the battery. Start with one side of the case, and then gently pry it open. Remove the old battery and put in a new CR2025 and make sure it's face-up for proper polarity. Finally, put the battery cap back on and reattach both sides to the key fob case, pressing until you hear them click. After replacing the battery After replacing the battery, lock and unlock your doors to ensure whether the fob works. If everything is working then you're able to use your Mazda 3's remote features on the road again! Pairing Issues This could mean that the transmitter in your car may have been damaged. It's usually a task that requires a professional. You will require a brand new key fob. If you've tried replacing the battery and reprogramming the key fob, but this isn't solving the issue it could be that the chip in the key fob might be malfunctioning. This can occur if the key fob has been dropped on hard surfaces or exposed to saltwater, or even touched by dirty hands. You will need to locate a small “key” that is built into the seam, to take off the circuit board and diagnose the problem. Then, you can examine the chip for corrosion or damage. It is best to use a clean towel to prevent damaging the microchip. You may also inspect the battery connector's terminals and determine if they're cracked or broken. If this is the case, carefully attaching them back will usually restore the function of the key fob. Similarly, you can inspect the buttons to determine if they are worn or damaged. If the buttons are loose they can be soldered back into place, unless one has physically snapped. Interference Signals There are few things more frustrating than trying to get the engine started in your car and then seeing the message “No Fob Detected”. This typically happens at most unpopular times, such as when you're late for work or if you're picking up kids from daycare or school. The good thing is that there are steps you can take to investigate the issue and figure out what is causing it. Interference signals can cause the remote key fob not to function in a proper manner. It can be caused by things like weather conditions, buildings and transmitters using the same frequency. Interference can also occur when you have aftermarket equipment installed in the vehicle that transmits at the same frequency as the key fob. The key fob could be damaged if exposed to salt water or water. The water can penetrate the rubber seals of the electronic chip particularly in the event that the key fob is submerged in water for a long period of time. The chip can stop working and require replacement of the keyfob. If you have a programmable key it is possible to clean the chip with isopropyl Alcohol or an electronic cleaner to help it come back to normal. If this doesn't help, the chip is likely to be damaged and will need to be replaced. Locking or Unlocking the Doors The buttons on the key fob transmit electronic signals to the solenoid in the car, which transforms this signal into a mechanical action. This locks and unlocks doors. If your door lock does not work it could be because of an issue with the solenoid. This will require professionals from auto repair shops to investigate. A dead 12 volt battery could cause the fob to stop functioning properly. This could happen if your battery fails to charge or if the contacts become damaged. The good news is that a new battery can fix this issue in just minutes. The receiver module may be the reason why the key fob doesn't work after replacing the battery or program the device. The device receives radio frequency signals from the key fob and interprets them into controlling the functions of the vehicle. If it malfunctions it could be costly to repair. To determine if this is the case, begin by inserting your spare key into the key slot and turning the ignition to ON. Press the key fob twice within 10 seconds without taking it. The Mazda 3 system will now be able to synchronize the key with your vehicle and you can then use it as your primary remote for driving. You can program up to three keys in this manner.