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Changing the Battery in Your Mazda 3 Key Fob There's nothing more annoying than getting in your vehicle after a long and tiring day and discovering that your key fob battery is dead. Luckily, it's an easy fix by purchasing a simple battery replacement from an hardware store or a big box retailer. Incorporating a spare key fob to your Mazda 3 can be an affordable solution to free yourself from the hassle of being driven to the dealership and having them re-program your keys. Battery Replacement You can change the battery on your Mazda 3 keyfob at home. It is recommended to replace it when the battery is dead or you notice a message stating “Low keyfob battery” on the multi-information display. Replace battery.” To open the key fob case, you'll need a tape-wrapped flathead screwdriver as well as some patience. Put the flathead screwdriver's head into a notch, or gap, on the bottom metal of the Mazda 3 key fob to cut off the lower half. Repeat the process for the top piece of metal however, be careful not to damage the rubber ring that is on the bottom of the case. There's a slot on each side of the case, where you can find the battery. Start on the opposite side of the case and then gently pry it open. Remove the old battery and then put in the new CR2025 ensure that it's facing upwards to ensure proper orientation. Put the cap of the battery on the other side and attach both sides of your key fob case by pressing until they click. After replacing the battery after replacing the battery, lock and unlock your doors to test whether the fob is working. If everything is working you're now able to use your Mazda 3's remote features for the first time! Pairing Issues This could mean that the transmitter inside your car has been damaged. It is typically a need for the assistance of a professional for repair and may need a new key fob. If you have tried replacing the battery and reprogramming the key fob, but it isn't solving the issue it could be that the chip inside the key fob is defective. This can happen when the key fob has been dropped on hard surfaces and exposed to salt water or even touched by dirty hands. g28carkeys.co.uk 'll need to find a small “key” that is inserted into the seam, in order to remove the circuit board and diagnose the problem. You will then be able to look for any damage or corrosion on the chip. To avoid damaging the microchip, it is recommended to clean the chip with a new paper towel. You can also examine the battery connector's terminals to determine if they're damaged or cracked. If this is the situation you can solder the terminals back to their place will usually restore functionality to the key fob. You can also check the buttons for damage or wear. If the buttons are loose, they can be re-soldered as well unless the button has actually snapped off. Interference Signals There are few things more frustrating than glancing at a “No Fob Detected” message when you attempt to start your car. It usually happens at the most awkward moments, such as when you're late for work or if you're picking up kids from school/daycare. There are a few things you can do to help figure out what's causing the issue. Interference signals can affect the remote key fob signal from the vehicle, causing it to not work properly. This can be caused by things like weather conditions, buildings and transmitters using the same frequency. Interference could also occur if you have equipment from an aftermarket manufacturer installed in the vehicle that transmits on the same frequency as the key fob. In addition, if the key fob is exposed to water or salt seawater, it may be damaged. Water can damage the rubber seals of the electronic chip particularly when the key fob has been submerged in water for a prolonged duration. The chip can stop working and require replacement of the keyfob. If you have a key that is able to be programmed or programmed, you can clean it with isopropyl or electronic cleaners to bring it back to its original function. If this does nothing will be able to fix the issue, then the chip has burned out and must be replaced. Locking/Unlocking the Doors The buttons on the key fob send electronic signals to a solenoid within the car that then converts the signal into a mechanical action that locks and unlocks doors. If the door lock is not functioning, the issue could be a solenoid malfunction that requires some analysis with the help of a professional auto repair shop. A dead 12 volt could also prevent the fob from working effectively. This happens when the battery loses its charge or the contacts are corroded and stop transmitting electricity. The good news is that a new battery can fix this problem in just minutes. The receiver module could be the reason why the key fob isn't working after you replace the battery or program the device. This device receives radio frequency signals from the key fob and interprets them into controlling the vehicle's functions. If it breaks down, it can be expensive to repair. To determine if this is the case, start by inserting your spare keys into the key slot and setting the ignition to ON. Press the key fob two times in 10 seconds, 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. You can program up to three keys this manner.