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Changing the Battery in Your Mazda 3 Key Fob There is nothing more frustrating than returning to your vehicle after a long and tiring day and realizing that the key fob battery is dead. This is a straightforward fix that can be found at a major box retailer or at a hardware store. Adding a spare key fob to your Mazda 3 can be an cost-effective way to stay away from having to be towed to the dealership and having them re-program your keys. Battery Replacement You can replace the battery on your Mazda 3 keyfob at home. But, it is best to replace the battery if it is dead, or if the key fob displays a message on the multi-information display that reads, “Low key fob battery. Replace battery.” To open the key fob's casing You'll need a tape wrapped flathead screwdriver and a bit of patience. Locate a notch or gap in the bottom metal part of your Mazda 3's key fob and then insert the tip of the screwdriver into it to pry off the lower half. Repeat this step for the top part of the metal Be careful not to scratch the rubber ring that is at the bottom of the key fob's case. Once the fob's case is open, you'll see a slot on either side of the case that houses the battery. Make use of the tape-wrapped flathead screwdriver to gently pry the case open, starting on one side and then shifting to the other. Remove the old battery and put in a new CR2025, making sure that it's facing upwards to ensure the correct polarity. Install the cap on the battery again and attach both sides of your key fob case by pressing until they click. Now that you've replaced the battery check the fob to ensure it works by locking and unlocking your doors. If everything looks good you're now able to use your Mazda 3's remote features on the road again! Pairing Issues This could be a sign that the transmitter in your car is damaged. It is usually a job for a professional, and you will need a new key fob. If you've tried to change the battery and reprogram the key fob, but it's not working the chip inside the key fob might be defective. This could happen if the key fob has been dropped on hard surfaces or exposed to saltwater or even brushed by dirty hands. You'll need to find an extremely small “key” that is inserted into the seam, to remove the circuit board to identify the issue. You can then check the chip for damage or corrosion. To avoid damaging the microchip, it is recommended to clean the chip with a new paper towel. If you're unsure, you can also check the battery connector's terminals for cracks or broken. If this is the situation it is possible to solder the terminals back to their place will usually restore the functionality of the key fob. You can also inspect the buttons for damage or wear. If the buttons are loose, they can easily be soldered back regardless of whether a button has physically snapped off. Interference Signals Few things are more frustrating than looking at the “No Fob Detected” message when trying to start your car. It can happen at the most unfavorable situations, like the time you're late to work or you're trying to collect your children from school or 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 coming from the vehicle making it unable to work properly. It can be caused by objects such as weather conditions, buildings, and transmitters that operate on the same frequency. Interference could occur if your vehicle has 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. The rubber seals on the electronic chip may be shattered by water, especially when it is submerged over long periods of time like in the ocean or a pool at the beach. The chip could stop working and may require replacement of the keyfob. If you have a programmeable key cleaning the chip with isopropyl alcohol or an electronic cleaner to help it return to functionality. If this does not work the chip, it's likely fried and will need to be replaced. Locking/Unlocking of the Doors The buttons on the fob's key send electronic signals to the solenoid of the car, which converts the signal into mechanical action. It locks and unlocks doors. If the door lock is not working, the problem could be due to a solenoid problem that requires analysis with the help of an expert repair shop for autos. A dead 12V battery can also stop the fob from working properly. mazda 2 key replacement can happen when your battery has lost its charge or if your contacts become corrosion-prone. The good news is that a new battery is able to resolve this issue in a matter of minutes. The receiver module may be the reason why the key fob isn't working after you replace the battery or program the device. The device detects radio frequency signals sent by the key fob to control the vehicle. It could be a costly repair if it malfunctions. To determine if this is true, place your spare key in the key slot. Then turn the ignition ON. Press the key fob twice within 10 seconds, without removing it. The Mazda 3 system will now sync the key to the car and allow you to use it as your primary remote for driving. This allows you to program up three keys.