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Changing the Battery in Your Mazda 3 Key Fob It is frustrating to drive off at the end of a long, hard day and discover that your key fob is dead. Luckily, it's simple to fix it with a simple battery replacement from a hardware store or big box retailer. Adding a spare key fob to your Mazda 3 can be an cost-effective way to stay away from the hassle of being transported to a dealership and having them re-program your keys. Battery Replacement The battery replacement in your Mazda 3 key fob is an easy procedure that you can do at home. But, you should only replace the battery if it is dead, or if the key fob shows a message on the multi-information display saying, “Low key fob battery. Replace battery.” You'll need to use an flathead screwdriver along with tape and patience to open the case. Find a gap or notch in the bottom of the metal part of the Mazda 3's key fob, and insert the head of the screwdriver into it to cut off the lower part. Repeat this procedure for the top part of the metal however, be careful not to damage the rubber ring at the bottom of the key fob's case. There's a slot the opposite side of the case, which houses the battery. Start on the other side of the case and then gently open it. Remove the old battery, and put in the new CR2025, making sure that it's facing up to ensure the correct orientation. Finally, place the cap on the battery and reattach both sides to the key fob's case. Continue pressing until you can hear them click. After replacing the battery Check the fob to verify that it's working by locking and unlocking your doors. If everything looks good, you can start using your Mazda 3's remote capabilities to drive again! Pairing Issues If your key fob stopped functioning suddenly it could mean that the transmitter inside your car has been damaged. This is usually a matter of an expert repair and will likely need a new key fob. If you've tried replacing the battery and reprogramming the key fob, but this does not solve the issue it is possible that the chip in the key fob may be faulty. This could happen if the key fob has been dropped on hard surfaces or exposed to saltwater, or even touched by dirty hands. To determine G28 Car Keys To determine the cause, you must find a small “key” embedded in the fob's seam that lets you open it up and remove the circuit board. Then, you can check the electronic chip for corrosion or damage. It is recommended to use a clean towel to prevent damaging the microchip. If you aren't sure it is possible to check the battery connector terminals for cracks or breaks. If this is the case, then carefully soldering them back in place can usually restore the function of the key fob. Also, you can check the buttons to see whether they're worn or damaged. If the buttons are loose, they can be soldered back into place in the event that the button has actually snapped off. Interference Signals There's nothing more frustrating than trying to start your car and then seeing the message “No Fob Detected”. It can happen at the most unfavorable time, for instance when you're late to work or have to pick up your children from school/daycare. The good thing is that there are a few steps you can take to investigate the issue and determine the cause. Interference signals can affect the remote key fob's signal to the vehicle, causing it to not work properly. This can be caused by objects such as buildings, weather conditions and transmitters that use the same frequency. Interference could also occur if you have aftermarket equipment installed in the vehicle that transmits at the same frequency as the key fob. The key fob could be damaged if it is exposed to salt water or water. The rubber seals on the electronic chip may be penetrated by water, particularly when it is submerged for long periods of time like in a pool or ocean at the beach. This could cause the chip to stop working, requiring replacement of the key fob. If you own a programmable key, you can clean the chip with isopropyl alcohol or an electronic cleaner to aid in its come back to normal. If this doesn't help, the chip is likely to be fried and will require to be replaced. Locking and Unlocking the Doors The buttons on the key fob send electronic signals to a solenoid inside the car that then converts that signal into a mechanical action that locks and unlocks doors. If the door lock fails to work it could be because of an issue with the solenoid. This requires professionals from auto repair shops to examine. A dead 12V battery can also hinder the fob from functioning effectively. This could happen if the battery loses its charge or if your contacts become damaged. This issue can be solved in a matter of minutes by replacing the battery. If the key fob doesn't work after changing the battery or try to reprogram it then the problem may be in the receiver module. This device interprets radio frequency signals sent by the key fob to control the vehicle. If it fails it could be costly to fix. To verify if this is true, insert your spare key into the key slot. Then, turn the ignition on. Press the key fob two times for 10 seconds without taking it out. The Mazda 3 system synchronizes the key with the vehicle and you can use it as your primary remote for driving. You can program up to three keys this way.