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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 end of a long, hard day and discover that the key fob is dead. Luckily, this is an easy fix using the simple replacement of a battery at the hardware store or big box retailer. Incorporating a spare key fob to your Mazda 3 can be an affordable solution to free yourself from having to be towed to the dealership and having them reprogram your keys. Battery Replacement Changing the battery in the Mazda 3 key fob is an easy process that can do at home. But, it is best to replace the battery when it is dead, or if the key fob displays a message on the multi-information display saying, “Low key fob battery. Replace battery.” To open the key fob's case it requires a tape-wrapped flathead screwdriver and a bit of patience. Locate a notch or gap in the bottom part of the metal of the Mazda 3's key fob and insert the head of the screwdriver into it to break off the lower portion. Repeat this process for the top portion of the metal however, be careful not to scratch the rubber ring at bottom of the key fob's case. There's a slot the opposite side of the case, which houses the battery. Use the tape-wrapped flathead screwdriver to gently pry the case open, starting on one side and then moving to the opposite. Remove the old battery and then put in a new CR2025 ensure that it's facing upwards to ensure proper orientation. Then, put the cap on the battery and reattach both sides to the key fob's case. Continue pressing until you can hear them click. After replacing the battery Lock and unlock your doors to test that the fob is working. If everything is in order then your Mazda 3 remote features can be used again. Pairing Issues If your key fob stop working all of a sudden it could be because the transmitter inside the car has been damaged. It is typically a need for the assistance of a professional for repair and will likely require a replacement key fob. If you've attempted to replace the battery and reprogramme the key fob, but it's not working the chip inside the key fob might be defective. This can happen if the keyfob has been dropped or exposed to saltwater or was touched by dirty fingers. To diagnose this issue You will need to find a small “key” located in the edge of the fob that allows you to take it apart and remove the circuit board. You can then examine the electronic chip for corrosion or damage. To avoid damaging the chip, it's recommended to use a clean paper towel. You may also take a close look at the battery connector's terminals to check if they're cracked or broken. If this is the case, then carefully attaching them back can often restore the function of the key fob. You can also check the buttons for damage or wear. If the buttons are loose, they can be re-soldered and also if the button is physically snapped off. Interference Signals Few things are more annoying than gazing at the “No Fob Detected” message when trying to start your car. This typically happens at most difficult time, such as when you're running late for work or when you have to pick up children from daycare or school. The good news is that there are steps you can take to investigate the issue and figure out the root of the problem. Interference signals can cause the remote key fob to cease working properly. This could be caused by objects like buildings, weather conditions and transmitters that operate on the same frequency. Interference can occur if your vehicle has aftermarket equipment that transmits at the same frequency as your key fob. The key fob may also be damaged if it is exposed to water or salty water. replace mazda key can penetrate the rubber seals of the electronic chip especially in the event that the key fob is submerged in water for an extended period of time. The chip may cease to function and require replacement of the keyfob. If you have a programable key, you can clean the chip with isopropyl Alcohol or an electronic cleaner to help it return to working. If this does not work the chip, it's likely to be damaged and will need to be replaced. Locking and Unlocking of Doors The buttons on the keys send electronic signals to the solenoid inside the car. It then converts the signal into a mechanical action that locks and unlocks doors. If the door lock isn't working, it could be due to a solenoid problem that requires some investigation by a professional auto repair shop. A dead 12 volt battery could also hinder the fob from functioning properly. This is the case if the battery's charge is lost or if the contactors are corroded and stop transmitting electricity. This problem can be fixed within a few minutes using a new battery. The receiver module could be the cause of the issue if the key fob won't work after replacing batteries or reprogram the device. This device receives radio frequency signals from the key fob and interprets them into controlling the vehicle's functions. If it malfunctions it could cost a lot to repair. To determine whether this is the case, begin by inserting your spare keys into the key slot and setting the ignition to ON. Press the key fob button twice in a matter of 10 seconds without removing it. The Mazda 3 system will now synchronize the key with the car and you can use it as your primary remote for driving. This lets you program up three keys.