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Changing the Battery in Your Mazda 3 Key Fob It's a pain to get into your car at the end of a long workday and discover that the key fob is dead. This is a simple fix that is easily done at a big box retailer or at a hardware store. Incorporating a spare key fob to your Mazda 3 can be an affordable way to keep yourself from having to be towed to the dealership and having them re-program your keys. Battery Replacement Removing the battery from your Mazda 3 key fob is an easy procedure that you can do at home. But, it is best to replace the battery if it fails, or when the key fob shows a message on the multi-information display saying, “Low key fob battery. Replace battery.” To open the key fob's case you'll need a tape-wrapped flathead screwdriver and some patience. Put the flathead screwdriver's head into a notch, or gap on the bottom metal of the Mazda 3 key fob to take off the lower portion. Repeat this process for the top metal part, but be careful not to scratch the rubber ring that is at the bottom of the key fob's case. There's a slot each side of the fob case, which houses the battery. Start on the opposite side of the case and gently pry it open. Take out the old CR2025 and replace it with a brand new one, making sure you place it face-up to ensure the correct orientation. Attach the cap to the battery again and secure both sides of your key fob case by pressing until they click. After replacing the battery, lock and unlock your doors to confirm that the fob is working. If everything looks good you're good to go. 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 task for a professional and you will need a new key fob. If you've tried replacing the battery and programming the key fob, but this does not solve the issue it is possible that the chip in the key fob might be damaged. This can happen if the key fob has been dropped on hard surfaces and exposed to salt water, or even touched by dirty hands. You'll need to locate the small “key” that is inserted into the seam, to remove the circuit board and identify the problem. Then, you can examine the electronic chip for corrosion or damage. It is best to use a clean, dry paper towel to avoid damaging the microchip. It is also possible to take a closer look at the battery connector's terminals to see if they are cracked or broken. If this is the case, carefully reconnecting them will usually restore the function of the key fob. In the same way, you can examine the buttons to see whether they are worn out or damaged. If the buttons are loose, they can be soldered back in place in the event that the button is actually snapped off. Interference Signals There are few things more frustrating than trying to start your car only to see the message “No Fob Detected”. This typically happens at most unpopular times, such as when you are late for work or picking up children from school/daycare. The good thing is that there are a few steps you can take to pinpoint the issue and determine the root of the problem. Interference signals can affect the remote key fob's signal from the vehicle making it unable to work correctly. This can be caused by objects such as weather conditions, buildings, 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. In mazda 6 key fob , if the key fob is exposed to salt or seawater, it may be damaged. The water can penetrate the rubber seals of the electronic chip, particularly if the key fob is submerged in water for an extended time. This can cause the chip to stop functioning and will require replacement of the key fob. If you have a key which can be programmed, you can clean it using electronic cleaners or isopropyl to restore its functionality. If this doesn't help you can be sure that the chip has burned out and must be replaced. Locking and Unlocking of Doors The buttons on the key fob transmit electronic signals to the solenoid inside the car, which then transforms the signal into mechanical action. This locks and unlocks doors. If the door lock is not functioning, the issue could be a solenoid malfunction 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 correctly. This could happen if your battery loses its charge or if the contacts are damaged. The good news is that a new battery is able to fix this issue in just minutes. If the key fob isn't functioning after you have changed the battery or program it again the problem could be related to the receiver module. The device detects radio frequency signals sent by the key fob to control the vehicle. It could be a costly repair if the device becomes defective. To test if this is correct, place your spare key into the key slot. Then, turn the ignition on. Press the key fob button two times in a matter of 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 this manner.