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Changing the Battery in Your Mazda 3 Key FobThere is nothing more frustrating than returning to your vehicle after a long day, and discovering that your key fob battery is dead. This is a simple fix that can be found at a major box retailer or at a hardware store.A spare key fob for your Mazda 3 is an inexpensive alternative to not having to take your vehicle to a dealer to have them reprogram the keys.Battery ReplacementThe battery replacement in your Mazda 3 key fob is an easy process that can do at home. You should only replace it if the battery is dead or you see a message reading “Low keyfob battery” on the multi-information display. Replace battery.”You’ll need an flathead screwdriver along with tape and patience to open the case. Put the flathead screwdriver’s head in a notch, or gap in the bottom part of the Mazda 3 key fob to remove the lower part. Repeat the process for the top part of the metal however, be careful not to scratch the rubber ring that is at the bottom of the key fob’s case.Once the fob’s case is open, you’ll be able to see an opening on either side of the case that houses the battery. Make use of the tape-wrapped flathead screwdriver to gently pry the case open, starting with one side and moving to the next. Remove the old CR2025 and replace it with a brand new one, making sure you place it face-up to ensure the correct orientation. Attach the cap to the battery the other side and attach both sides of your key fob case by pressing until they click.Now that you’ve replaced the battery Check the fob to make sure it is working by locking and unlocking your doors. If everything looks good the Mazda 3 remote features can be used again.Pairing IssuesThis could mean that the transmitter inside your car may have been damaged. It is typically a need for an expert repair and will likely require a new replacement key fob.If you have tried replacing the battery and programming the key fob but did not resolve the issue it is possible that the chip in the key fob might be defective. This could happen if the key fob was dropped on hard surfaces or exposed to saltwater, or even touched by dirty hands.You will need to locate a small “key” that is inserted into the seam, in order to remove the circuit board and determine the problem. You can then examine the chip for damage or corrosion. To avoid damaging the chip, it is best to use a fresh paper towel.If you’re not sure then you should also examine the battery connector terminals for cracks, or breaks. If this is the situation, soldering the terminals back into place can usually restore functionality to the key fob. You can also examine the buttons for wear or damage. If the buttons are loose, they can easily be soldered back as well unless the button is actually snapped off.Interference SignalsThere’s nothing more difficult than trying to start your vehicle and getting the message “No Fob Detected”. It can happen at the most unfavorable time, for instance when you’re late to work or have to pick up your children from school/daycare. There are Related Site can do to find out the root of the issue.Interference signals can cause the remote key fob to stop functioning 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 salt or water it may be damaged. 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 prolonged period of time. The chip may cease to function and require replacement of the keyfob. If you have a programmable key it is possible to clean the chip using isopropyl alcohol or an electronic cleaner to help it return to working. If this doesn’t work then it’s likely that the chip is fried and needs to be replaced.Locking/unlocking the DoorsThe buttons on the key fob send electronic signals to the solenoid in the car, which transforms this signal into a mechanical action. This locks and unlocks doors. If the door lock isn’t working, it may be a solenoid issue that requires investigation with the help of an expert auto repair shop.A dead battery of 12 volts can cause the fob to stop functioning correctly. This can happen if the battery loses charge or the contacts become corroded and stop conducting electricity. The good news is that a new battery can solve this issue in only minutes.If the key fob isn’t working after you change the battery or re-program it the problem could be in the receiver module. This device receives radio frequency signals from the key fob and interprets them to control the functions of the vehicle. If it fails it could cost a lot to repair.To determine if this is the case, start by putting your spare key into the key slot and turning the ignition to ON. Press the key fob two times in a period of 10 seconds, without removing it. The Mazda 3 system will now be able to synchronize the key with your car, and you can use it as your primary remote for driving. This lets you program up to three keys.