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Changing the Battery in Your Mazda 3 Key Fob It can be a bit frustrating to get into your car at the conclusion of a long and tiring day and find that the key fob is dead. This is a simple fix that can be found at a big box retailer or at a hardware store. The addition of a spare key fob to your Mazda 3 can be an affordable way to keep yourself from having to be driven to the dealership and having them re-program your keys. Battery Replacement You can change the battery on your Mazda 3 keyfob at home. You should only replace it when the battery dies or if you get a message that reads “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 and a bit of patience. Find a gap or notch in the bottom part of the metal of the Mazda 3's key fob and insert the head of the screwdriver to remove the lower part. Repeat the procedure for the top metal piece but be careful not to damage the rubber ring that is on the bottom of the case. Once the fob case is open, you'll find an opening on either side of the case that houses the battery. Use the flathead screwdriver with tape to gently open the case, beginning at one end and moving to the other. Take out the old CR2025 and replace it with a brand new one, making sure that you place it face-up to ensure proper orientation. Finally, place the cap back on and reconnect both sides of the key fob's case. Continue pressing until you hear them click. Now that you've replaced the battery check the fob to verify that it's working by locking and unlocking your doors. If everything is in order, you can start using the Mazda 3's remote features for the first time! Pairing Issues If your key fob stops functioning suddenly, this could indicate that the transmitter in the car is damaged. This is usually a matter for a professional and you will require a brand new key fob. If you've tried replacing the battery and reprogramme the key fob but it hasn't worked then the chip in the key fob could be faulty. This can happen if the key fob was dropped on hard surfaces or exposed to salt water, or even touched by dirty hands. You'll need to locate the tiny “key”, which is built into the seam, in order to remove the circuit board and identify the issue. Then, you will be able to check for any corrosion or damage on the electronic chip. mazda rx8 key is recommended to use a clean, dry paper towel to prevent damaging the microchip. It is also possible to examine the battery connector's terminals to examine if they're cracked or broken. If this is the situation you can solder the terminals back to their original position will usually restore the functionality of the key fob. Similarly, you can inspect the buttons to see whether they've been worn out or damaged. If the buttons are loose, they can be soldered back into place unless one has physically snapped. Interference Signals There is nothing more frustrating than staring at a “No Fob Detected” message when you attempt to start your car. This happens at the worst situations, like when you're running late to work or you're trying to collect your children from daycare/school. The good news is that there are steps you can take to pinpoint the issue and determine the root of the problem. Interference signals can cause the remote key fob to stop functioning properly. This can be caused by objects such as buildings, weather conditions and transmitters that operate on the same frequency. Interference may also occur if you have an aftermarket device installed in your vehicle that transmits on the same frequency as the key fob. The key fob could be damaged if exposed to water or salty water. The rubber seals on the electronic chip may be damaged by water, especially in the event that it is submerged for long periods of time like in a pool or ocean at the beach. The chip can stop working and may require replacement of the keyfob. If you have a key which can be programmed and cleaned with isopropyl or electronic cleaners to bring it back to its original function. If this doesn't work then it's likely that the chip has been damaged and will need to be replaced. Locking/Unlocking the Doors The buttons on the key fob transmit electronic signals to the solenoid inside the car, which converts this signal into mechanical action. This locks and unlocks doors. If the door lock isn't working, the problem could be a solenoid malfunction that requires some investigation with the help of an expert repair shop for autos. A dead 12 volt battery could also prevent the fob from functioning correctly. This could happen if the battery is not charged or if the contacts become damaged. The problem can be addressed in a matter of minutes by replacing the battery. If the key fob isn't functioning after you change the battery or reprogram it the problem could be related to the receiver module. The device receives radio frequency signals from the key fob and interprets them into controlling the functions of the vehicle. It can be a costly repair if it becomes faulty. 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 in a period of 10 seconds, without removing it. The Mazda 3 system synchronizes the key to the vehicle and you can use it as your primary driving remote. This lets you program up three keys.