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Changing the Battery in Your Mazda 3 Key Fob It's frustrating to drive off at the end of a long, hard day and discover that your key fob is dead. This is a straightforward 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 affordable way to keep yourself from having to be taken to the dealer and having them re-program your keys. Battery Replacement You can replace the battery on your Mazda 3 keyfob at home. You should only replace it when the battery goes out or if you get a message that reads “Low keyfob battery” on the multi-information display. Replace battery.” To open the key fob's casing You'll need a tape wrapped flathead screwdriver and a bit of patience. Put the head of the flathead screwdriver in a notch or gap on the bottom metal of the Mazda 3 key fob to pry the lower half off. Repeat this step for the top metal part Be careful not to scratch the rubber ring at the bottom of the key fob's case. There's a slot on each side of the fob case that houses the battery. Start on the opposite side of the case, and then gently open it. Remove the old battery, and put in a new CR2025, making sure that it's face-up for the correct orientation. Put the cap of the battery on again and attach both sides of your key fob case by pressing until they click. After replacing the battery, lock and unlock your doors to confirm whether the fob is working. If everything appears to be working you're now able to use the Mazda 3's remote functions for the first time! Pairing Issues If your key fob stops suddenly it could be because the transmitter in the car has been damaged. This usually requires a professional to repair and will likely require a replacement key fob. If you've tried replacing the battery and reprogram the key fob, but it's not working the chip inside the key fob may be faulty. This could be the case if the keyfob was dropped, exposed to saltwater, or handled by dirty fingers. You will need to locate the tiny “key”, which is built into the seam, in order to remove the circuit board and determine the problem. You can then examine the electronic chip for damage or corrosion. It is best to use a clean, dry paper towel to avoid damaging the microchip. If you're not sure, you can also check the battery connector terminals for cracks or broken. If this is the situation it is possible to solder the terminals back into place can usually restore functionality to the key fob. You can also inspect the buttons for damage or wear. If the buttons are loose, they can be soldered back in place and also if the button is physically snapped off. Interference Signals There are few things more frustrating than trying to get the engine started in your vehicle and getting the message “No Fob Detected”. It usually happens at the most inconvenient times, such as the time you're late to work or when you are picking up your children from school/daycare. The good news is that there are steps you can take to troubleshoot the issue and determine the root of the problem. Interference signals can disrupt the remote key fob signal from the vehicle making it unable to function correctly. This can be caused by things such as buildings, weather conditions and transmitters that use the same frequency. Interference can occur when your vehicle is equipped with aftermarket equipment that transmits at the same frequency as your key fob. Additionally, if the key fob is exposed to salt or water water it may be damaged. mazda 2 key fob G28 on the electronic chip could be shattered by water, particularly in the event that it is submerged for an extended period of time like in a pool or ocean at the beach. This can cause the chip to stop functioning and may require replacement of the key fob. If you have a key that can be programmed to work, you can clean it using isopropyl or electronic cleaners to restore its functionality. If this doesn't help will be able to fix the issue, then the chip has been damaged and requires replacement. Locking/Unlocking the Doors The buttons on the key fob send electronic signals to the solenoid of the car, which then converts the signal into mechanical action. This locks and unlocks doors. If the door lock is not functioning, the issue could be a solenoid issue that requires analysis with the help of a professional auto repair shop. A dead 12 volt could also hinder the fob from working effectively. This can happen when your battery fails to charge or if the contacts become corrosion-prone. The good news is that a new battery can fix this issue in just minutes. If the key fob isn't working after you replace the battery or re-program it then the problem may be related to the receiver module. This device interprets radio frequency signals transmitted by the key fob to control the vehicle. It could be expensive to repair if the device becomes defective. To determine whether this is the case, start by inserting the spare key into the key slot and turning the ignition to ON. Press the key fob twice within 10 seconds, but without taking it out. The Mazda 3 system will now be able to synchronize the key with your car, and you can use it as your primary remote for driving. This allows you to program up three keys.