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Changing the Battery in Your Mazda 3 Key Fob It can be a bit frustrating to drive off at the end of a long workday and discover that your key fob is dead. Luckily, this is simple to fix it with simple battery replacement from the hardware store or big box retailer. A spare key fob for your Mazda 3 is an inexpensive alternative to not having to take it by a dealership to let them re-program the keys. Battery Replacement Removing the battery from your Mazda 3 key fob is an easy process that can do at home. However, you should replace the battery when it goes out of service, or if the key fob displays a message on the multi-information display stating, “Low key fob battery. Replace battery.” You'll need to use a flathead screwdriver and tape and patience to open the case. Insert the flathead screwdriver's tip in a notch or gap in the bottom part of the Mazda 3 key fob to take off the lower portion. Repeat this process for the top portion of the metal but be careful not to scratch the rubber ring at the bottom of the key fob's case. There's a slot the opposite side of the case, where you can find the battery. Use the tape-wrapped flathead screwdriver to gently the case open, starting at one end and shifting to the other. Remove the old CR2025 and replace it with a new one, making sure that you place it face-up to ensure the correct the polarity. Finally, place the cap of the battery back on and reattach both sides of the key fob's case. Continue pressing until you hear them click. After replacing the battery Lock and unlock your doors to ensure that the fob is working. If everything seems to be in good order, your Mazda 3 remote features can be used again. Pairing Issues This could mean that the transmitter in your car has been damaged. It's usually a task that requires a professional. You will require a new key fob. If you've tried to change the battery and reprogramme the key fob but it's not working then the chip in the key fob might be faulty. This can happen when the key fob was dropped on hard surfaces, exposed to salt water, or even touched by dirty hands. To diagnose this issue You will need to locate a tiny “key” located in the edge of the fob that allows you to take it apart and take out the circuit board. Then, you will be able to check for any damage or corrosion on the electronic chip. To prevent damaging the chip, it is best to use a fresh paper towel. If you are unsure then you should also examine the battery connector's terminals for cracks or broken. If this is the case, then carefully attaching them back can generally restore the functionality of the key fob. You can also check the buttons for damage or wear. If the buttons are loose, they can easily be soldered back in place regardless of whether the button is actually snapped off. mazda 2 key fob There is nothing more frustrating than looking at a “No Fob Detected” message when you attempt to start your vehicle. It happens at the worst possible times, like when you're late for work or have to pick up your children from school or daycare. There are a few things you can do to troubleshoot and find out what's causing the issue. Interference signals can interfere with the remote key fob signal from the vehicle and cause it to not work properly. This can be caused by objects such as weather conditions, buildings, and transmitters that operate on the same frequency. Interference may occur if your vehicle has aftermarket equipment that transmits at the same frequency as your key fob. In addition, if your key fob is exposed to water or salt waters, it could be damaged. Water can penetrate the rubber seals of the electronic chip particularly in the event that the key fob is submerged in water for a lengthy duration. This can cause the chip's function to cease, requiring replacement of the key fob. If you have a key which can be programmed to work, you can clean it with isopropyl or electronic cleaners to bring it back to its original function. If this does nothing you can be sure that the chip is fried and needs to be replaced. Locking and Unlocking the Doors The buttons on the key fob transmit electronic signals to a solenoid in the car, which converts that signal into mechanical action that locks and unlocks the doors. If the door lock isn't working, it could be due to a solenoid problem that requires investigation with the help of an expert repair shop for autos. A dead 12 volt battery could also prevent the fob from functioning properly. This could happen if your battery is not charged or if your contacts get corrosion-prone. The good news is that a new battery is able to resolve this issue in a matter of minutes. If the key fob isn't working after you replace the battery or program it again the issue could be with the receiver module. The device interprets radio frequency signals received by the key fob to control the vehicle. It can be a costly repair if the device becomes defective. To confirm if this correct, place your spare key in the key slot. Then turn the ignition on. Press the key fob button two times within 10 seconds without removing it. The Mazda 3 system will now connect the key to the car, and you can use it as your primary remote for driving. You can program up to three keys in this manner.