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Changing the Battery in Your Mazda 3 Key FobThere’s nothing more frustrating than getting to your vehicle after a long day, and finding that the key fob battery is dead. This is a straightforward solution that can be accomplished at a big box retailer or at a hardware store.A spare key fob to your Mazda 3 can be an inexpensive way to save yourself from the hassle of being towed to the dealership and having them reprogram your keys.Battery ReplacementThe battery replacement in your Mazda 3 key fob is an easy task that you can perform at home. However, you should replace the battery if it fails, or when the key fob displays a message in the multi-information display stating, « Low key fob battery. Replace battery. »To open the key fob’s case you’ll need a tape-wrapped flathead screwdriver, along with some patience. Find a gap or notch in the bottom portion of the metal of the Mazda 3’s key fob, and then insert the head of the screwdriver in it to pry off the lower portion. Repeat the procedure for the top metal piece Be careful not to damage the rubber ring on the bottom of the case.You’ll find a slot on the opposite side of the case, where you can find the battery. Use the flathead screwdriver with tape to gently the case open, starting at one end and moving to the opposite. Remove the old CR2025 and replace it with a new one, making sure that you place it face-up to ensure the correct orientation. Install the cap on the battery 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 is working. If everything appears to be working the Mazda 3 remote features can be used again.Pairing IssuesIf your key fob stops functioning suddenly it could be because the transmitter inside your car has been damaged. This typically requires an expert repair and may require a new key fob.If you’ve tried to replace the battery and reprogram the key fob but it’s not working it is possible that the chip inside the key fob may be defective. This can happen if your keyfob was dropped or exposed to saltwater or the touch of dirty fingers.To identify the issue You will need to find a small « key » embedded in the fob’s seam that allows you to open it up and remove the circuit board. You can then check the chip for damage or corrosion. To prevent damaging the microchip, it is recommended to use a clean paper towel.If you’re unsure then you should also examine the battery connector terminals for cracks or breaks. If this is the case, carefully reconnecting them can generally restore the functionality of the key fob. Similarly, you can inspect the buttons to determine whether they’re worn or damaged. If the buttons are loose, they can be soldered back and also if the button is actually snapped off.Interference SignalsFew things are more frustrating than staring at an « No Fob Detected » message when you attempt to start your vehicle. It usually happens at the most difficult moments, like when you’re late for work or when you are picking up your children from school/daycare. The good news is that there are a few steps you can take to pinpoint the issue and determine the cause.Interference signals can cause the remote key fob to stop functioning in a proper manner. It can be caused by things like weather conditions, buildings, as well as transmitters operating on the same frequency. Interference could occur if your vehicle has aftermarket equipment that transmits at the same frequency as your key fob.The key fob might be damaged if it is exposed to salt water or water. Water can get into the rubber seals of the electronic chip especially if the key fob is submerged in water for an extended period of time. The chip could stop working and require replacement of the keyfob. If you have a programmeable key you can clean the chip with isopropyl alcohol or an electronic cleaner to help it get back to its original functionality. If this doesn’t work then it’s likely that the chip has burned out and will need to be replaced.Locking and Unlocking the DoorsThe buttons on the fob’s key send electronic signals to the solenoid inside the car, which transforms this signal into a mechanical action. It locks and unlocks doors. If the door lock is not functioning, the issue may be a solenoid issue that requires some investigation with the help of an expert auto repair shop.A dead 12 volt can also hinder the fob from working properly. This can happen if the battery is unable to charge or if the contactors get corroded and stop transferring electricity. The problem can be addressed within a few minutes using a new battery.The receiver module may be the cause of the issue if the key fob isn’t working after replacing the battery or reprogram the device. This device interprets radio frequency signals transmitted by the key fob to control the vehicle. If mazda 2 key fob breaks down, it can be expensive to repair.To determine if this is correct, place your spare key in the key slot. Then, turn the ignition on. Press the key fob two times for 10 seconds without removing it. The Mazda 3 system synchronizes the key to the vehicle, and you can now use it as your primary driving remote. This allows you to program up to three keys.