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Changing the Battery in Your Mazda 3 Key Fob There's nothing more annoying than stepping into your vehicle after a long day, and realizing that the key fob battery is dead. This is a simple fix that can be found at a major box retailer or hardware store. A spare key fob for your Mazda 3 is an inexpensive alternative to not having to take your vehicle to a dealership to have them reprogram the keys. Battery Replacement You can replace the battery on your Mazda 3 keyfob at home. However, you should only replace the battery when it goes out of service, or if the key fob shows a message on the multi-information display stating, “Low key fob battery. Replace battery.” To open the key fob case it requires a tape-wrapped flathead screwdriver and a bit of patience. The head of the flathead screwdriver into a notch, or gap in the bottom part of the Mazda 3 key fob to take off the lower portion. Repeat this step for the top metal piece Be careful not to damage the rubber ring at the bottom of the key fob's case. There's new mazda key G28 Car Keys of the fob case that contains the battery. Start on the other side of the case and gently lift it up. Take out the old CR2025 and replace it with a brand new one, ensuring that you put it on its face to ensure the correct polarity. Attach the cap to the battery the other side and attach both sides of your key fob case by pressing until they click. After replacing the battery Lock and unlock your doors to ensure whether the fob is working. If everything seems to be in good order, your Mazda 3 remote features can be used again. Pairing Issues If your key fob has stopped working suddenly it could be a sign that the transmitter in the car is damaged. It's usually a task to a professional and you will need a new 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 could be faulty. This could happen if the key fob was dropped on hard surfaces or exposed to saltwater, or even touched by dirty hands. To diagnose this issue To determine the cause, you must locate a tiny “key” located in the edge of the fob that lets you open it and take out the circuit board. Then, you will be able to look for any corrosion or damage on the electronic chip. It is best to use a clean towel to avoid damaging the microchip. If you aren't sure then you should also examine the battery connector's terminals for cracks or breakage. If this is the case then resoldering the terminals to their original position will usually restore functionality to the key fob. Additionally, you can look at the buttons to see whether they're worn or damaged. If the buttons are loose, they can be resoldered into place unless one has physically snapped. Interference Signals There is nothing more frustrating than staring at the “No Fob Detected” message when you attempt to start your car. This typically happens at most difficult moments, such as when you're running late for work or picking up children from daycare or school. There are a few things you can try to figure out the root of the issue. Interference signals can disrupt the remote key fob's signal from the vehicle making it unable to function correctly. It can be caused by things like weather conditions, buildings, and transmitters that operate on the same frequency. Interference can also occur if you have an aftermarket device installed in the vehicle that transmits on the same frequency as the key fob. Additionally, if the key fob is exposed to water or salt seawater, it may be damaged. The rubber seals on the electronic chip can be shattered by water, especially when it is submerged for long periods of time, like in a pool or ocean at the beach. The chip can stop working and require replacement of the keyfob. If you own a programmable key, you can clean the chip with isopropyl Alcohol or an electronic cleaner to aid in its return to working. If this does nothing you can be sure that the chip has fried and requires replacement. Locking/unlocking the Doors The buttons on the key fob send electronic signals to the solenoid inside the car, which transforms this signal into a mechanical action. This locks and unlocks doors. If your door lock doesn't work, it could be an issue with the solenoid. This requires professional repair shops to analyze. A dead 12 volt can also prevent the fob from functioning properly. This can happen if the battery loses its charge or if the contactors become corroded and stop conducting electricity. The good news is that a new battery can solve this issue in only minutes. The receiver module could be the problem if the key fob does not function after you replace the battery or program the device. This device detects radio frequency signals sent by the key fob to control the vehicle. If it malfunctions it could be costly to fix. To confirm if this correct, place your spare key into the key slot. Then, turn the ignition ON. Press the key fob twice for 10 seconds without removing it. 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.