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Changing the Battery in Your Mazda 3 Key Fob There's nothing more annoying than getting to your vehicle after a long and tiring day and discovering that the key fob battery is dead. This is a straightforward 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 be towed to a dealer to have them re-program the keys. Battery Replacement You can replace the battery on your Mazda 3 keyfob at home. It is recommended to replace it when the battery goes out or if you notice a message stating “Low keyfob battery” on the multi-information display. Replace battery.” To open the key fob case You'll need a tape wrapped flathead screwdriver, along with some patience. Locate a notch or gap in the bottom part of the metal of your Mazda 3's key fob and then insert the head of the screwdriver to break off the lower part. Repeat the process for the top metal piece however, be careful not to damage the rubber ring at the bottom of the case. Once the fob case has been open, you'll be able to see the slot on either side of the case that houses the battery. Use the flathead screwdriver with tape to gently the case open, beginning on one side and then shifting to the other. Remove the battery that was used and place in the new CR2025, making sure that it's in the right orientation for proper polarity. Finally, put the cap of the battery back on and reattach both sides of the key fob's case. Continue pressing until you can hear them click. Now that you've replaced the battery check the fob to ensure it functions by locking and unlocking your doors. If everything is working, you can start using the Mazda 3's remote functions for the first time! Pairing Issues This could be a sign that the transmitter in your car may have been damaged. It is usually a job to 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 the chip inside the key fob may be faulty. This can happen if the key fob was dropped on hard surfaces or exposed to saltwater, or even touched by dirty hands. To diagnose this issue You will need to find a small “key” embedded in the fob's seam which allows you to lift it open and remove the circuit board. Then, you can check the electronic chip for corrosion or damage. To prevent damaging mazda 3 keys , it's recommended to use a clean paper towel. It is also possible to take a close look at the battery connector's terminals to see if they are cracked or broken. If this is the case, carefully connecting them back will usually restore the function of the key fob. Also, you can check the buttons to determine whether they've been worn out or damaged. If the buttons are loose, they can easily be soldered back in place as well unless a button has physically snapped off. 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”. It typically happens at most difficult time, such as the time you're late to work or when you are picking up your children from daycare or school. The good thing is that there are a few steps you can follow to resolve the issue and determine what is causing it. Interference signals can cause the remote key fob not to function in a proper manner. This can be caused by things like buildings, weather conditions and transmitters that operate on the same frequency. Interference may occur if your vehicle is equipped with aftermarket equipment that transmits at the same frequency as your key fob. The key fob could be damaged if it is exposed to salt water or water. The water can penetrate the rubber seals of the electronic chip, especially when the key fob has been submerged in water for an extended duration. The chip may cease to function and may require replacement of the keyfob. If you have a programmeable key, you can clean the chip with isopropyl alcohol or an electronic cleaner to aid in its get back to its original functionality. If this doesn't work will be able to fix the issue, then the chip has been damaged and will need to be replaced. Locking or Unlocking the Doors The key fob's buttons send electronic signals to a solenoid in the car. It converts the signal into a mechanical action that locks and unlocks doors. If the door lock isn't functioning, the issue could be a solenoid malfunction that requires investigation with the assistance of an expert repair shop for autos. A dead 12 volt battery could also prevent the fob from functioning properly. This could happen if the battery's charge is lost or if the contactors get corroded and stop transferring electricity. This issue can be resolved in just a few minutes by purchasing a new battery. The receiver module could be the cause if the key fob won't work after you replace batteries or reprogram the device. This device receives radio frequency signals from the key fob and interprets them into controlling the vehicle's functions. It can be a costly repair if it is damaged. To check if this is the case, start by inserting your spare keys into the key slot and setting the ignition to ON. Press the key fob two times within 10 seconds, but 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 allows you to program up to three keys.