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Changing the Battery in Your Mazda 3 Key FobIt's frustrating to pull into your car at the end of a long workday and find that the key fob is dead. This is a simple solution that can be accomplished at a big box retailer or at a hardware store.Incorporating a spare key fob to your Mazda 3 can be an cost-effective way to stay away from the hassle of being transported to a dealership and having them re-program your keys.G28 Car Keys can change the battery on your Mazda 3 keyfob at home. It is recommended to replace it if the battery dies or if you see a message saying "Low keyfob battery" on the multi-information display. Replace battery."You'll need a flathead screwdriver with tape and patience to open the case. Insert the flathead screwdriver's head into a notch, or gap, on the bottom metal of the Mazda 3 key fob to remove the lower part. Repeat this step for the top portion of the metal, but be careful not to damage the rubber ring at bottom of the key fob's case.Once the fob's case is open, you'll see the slots on either side of the case that houses the battery. Use the tape-wrapped flathead screwdriver to gently pry the case open, starting at one end and moving to the next. Remove the old CR2025 and replace it with a new one, making sure to put it on its face to ensure the correct polarity. Finally, put the cap back on and then reattach both sides of the key fob's case. Continue pressing until you can hear them click.After replacing the battery Lock and unlock your doors to confirm whether the fob works. If everything is in order then you're able to use your Mazda 3's remote capabilities in the road!Pairing IssuesIf your key fob has stopped suddenly it could mean that the transmitter inside the car has been damaged. It's usually a task to a professional and you will need a new key fob.If you've tried replacing the battery and reprogramming the key fob, but does not solve the issue, it is possible that the chip in the key fob is malfunctioning. This can happen if the keyfob has been dropped, exposed to saltwater, or handled by dirty fingers.To diagnose this issue To determine the cause, you must find a small "key" embedded in the edge of the fob that allows you to open it up and remove the circuit board. You can then examine the chip for corrosion or damage. To prevent damaging the chip, it's recommended to use a clean paper towel.It is also possible to take a closer look at the battery connector terminals to determine if they're 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're worn or damaged. If they are loose, they can be soldered back into place, unless one has physically snapped.Interference SignalsThere is nothing more frustrating than gazing at the "No Fob Detected" message when you attempt to start your car. This usually occurs at the most awkward time, such as when you're running late for work or picking up children from daycare/school. There are several things you can do to troubleshoot and find out what's causing the issue.Interference signals can cause the remote key fob to cease working properly. This could be caused by things such as buildings, weather conditions, and transmitters that use the same frequency. Interference could also occur if you have equipment from an aftermarket manufacturer installed in your vehicle that transmits on the same frequency as the key fob.The key fob might be damaged if exposed to water or salty water. The water can penetrate the rubber seals of the electronic chip particularly when the key fob has been submerged in water for a lengthy period of time. The chip may cease to function and require replacement of the keyfob. If you have a programable key it is possible to clean the chip with isopropyl alcohol or an electronic cleaner to aid in its come back to normal. If this doesn't help the chip, it's likely to be fried and will require to be replaced.Locking/unlocking the DoorsThe key fob's buttons send electronic signals to a solenoid in the car. It then converts the signal into a mechanical action that locks and unlocks doors. If the door lock isn't functioning, the issue could be due to a solenoid problem that requires some analysis with the help of an expert repair shop for autos.A dead 12 volt battery could also hinder the fob from working effectively. This can happen if the battery loses charge or if the contacts become corroded, and stop transferring electricity. The good news is that a new battery is able to fix this problem in just minutes.If the key fob doesn't work after you have changed the battery or try to re-program it, the issue might be in the receiver module. The device receives radio frequency signals from the key fob and interprets them to control the vehicle's functions. If it breaks down it could be costly to repair.To determine if this is the case, begin by inserting the spare key into the key slot and setting the ignition to ON. Press the key fob button two times within 10 seconds without taking it. The Mazda 3 system will now connect the key to the car and you can use it as your primary remote for driving. This allows you to program up three keys.