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Changing the Battery in Your Mazda 3 Key Fob It is frustrating to drive off at the end of a long workday and discover that your key fob is dead. This is a straightforward fix that is easily done at a big box retailer or hardware store. Adding a spare key fob to your Mazda 3 can be an affordable solution to free yourself from having to be taken to the dealer and having them reprogram your keys. Battery Replacement You can change the battery on your Mazda 3 keyfob at home. However, you should only replace the battery if it fails, or when the key fob displays a message on the multi-information display stating, “Low key fob battery. Replace battery.” To open the key fob's casing it requires a tape-wrapped flathead screwdriver as well as some patience. Find a gap or notch in the bottom of the metal part of the Mazda 3's key fob and then insert the tip of the screwdriver to break off the lower portion. Repeat the process for the top portion of the metal, but be careful not to damage the rubber ring that is at the bottom of the key fob's case. Once the fob case is open, you'll find an opening on either side of the case that houses the battery. Use the tape-wrapped flathead screwdriver to gently pry open the case, beginning with one side and moving to the next. Take out the old CR2025 and replace it with a new one, making sure to place it face-up to ensure proper polarity. Put the cap of the battery on again, and then attach both sides of your key fob case by pressing until they click. After replacing the battery after replacing the battery, lock and unlock your doors to confirm that the fob works. If everything appears to be working then your Mazda 3 remote features can be used again. Pairing Issues This could indicate that the transmitter in your car may have been damaged. It's usually a job for a professional and you will require a brand new key fob. If you've tried to replace the battery and reprogramme the key fob but it's not working then the chip in the key fob might be defective. This could happen if the key fob was dropped on hard surfaces, exposed to salt water or even brushed by dirty hands. You'll need to find a small “key” that is inserted into the seam, to remove the circuit board and diagnose the issue. Then, you can check the electronic chip for damage or corrosion. It is best to use a clean, dry paper towel to avoid damaging the microchip. You can also take a closer look at the battery connector terminals to see if they are damaged or cracked. If this is the case, carefully reconnecting them will usually restore the function of the key fob. Additionally, you can look at the buttons to see whether they've been worn out or damaged. If the buttons are loose, they can be soldered back into place regardless of whether a button has physically snapped off. Interference Signals There are few things more difficult than trying to start your vehicle and getting the message “No Fob Detected”. This can happen at the most inconvenient possible times, like the time you're late to work or when you have to pick up your children from daycare or school. The good thing is that there are a few steps you can take to troubleshoot the issue and figure out the root of the problem. Interference signals can disrupt the remote key fob signal from the vehicle and cause it to not work correctly. This can be caused by objects such as 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. In addition, if the key fob is exposed to salt or waters, it could be damaged. Water can get into the rubber seals of the electronic chip, particularly when the key fob is submerged in water for an extended duration. This could cause the chip's function to cease and may require replacement of the key fob. If you have a key that is able to be programmed to work, you can clean it with isopropyl or electronic cleaners to restore its function. 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 send electronic signals to the solenoid inside the car, which converts the signal into mechanical action. It locks and unlocks doors. If the door lock isn't functioning, the issue could be a solenoid malfunction that requires analysis with the help of a professional auto repair shop. A dead 12 volt battery can cause the fob to stop functioning properly. This is the case if the battery's charge is lost or the contacts get corroded and stop transferring electricity. The good news is that a new battery is able to resolve this issue in a matter of minutes. The receiver module could be the reason why the key fob doesn't work after replacing the battery or re-program the device. This device detects radio frequency signals sent by the key fob to control the vehicle. It could be expensive to repair if it malfunctions. To determine if this is the case, begin by inserting your spare key into the key slot and turning the ignition to ON. Press mazda 3 key within 10 seconds, but without removing it. The Mazda 3 system will now connect the key to the vehicle and you can then use it as your primary remote for driving. This allows you to program up to three keys.