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Changing the Battery in Your Mazda 3 Key Fob There is nothing more frustrating than getting in your vehicle after a long day, and discovering that your key fob battery is dead. Luckily, it's an easy fix by purchasing simple battery replacement from a hardware store or big box retailer. A spare key fob to your Mazda 3 can be an cost-effective way to stay away 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. However, you should only replace the battery if it is dead, or if the key fob displays a message on the multi-information display stating, “Low key fob battery. Replace battery.” You'll need to use a flathead screwdriver with tape and patience to open the case. Find a gap or notch in the bottom part of the metal of your Mazda 3's key fob, and then insert the tip of the screwdriver to break off the lower half. Repeat how to open a mazda 2 key fob for the top metal part, but be careful not to scratch the rubber ring on the bottom of the key fob's case. Once the fob's case is open, you'll be able to see an opening on either side of the case, which houses the battery. Start on the other side of the case and gently push it open. Remove the old CR2025 and replace it with a brand new one, making sure to put it on its face to ensure the correct polarity. Place the battery cap on again 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 confirm that the fob works. If everything seems to be in good order, your Mazda 3 remote features can be used again. Pairing Issues If your key fob stops working all of a sudden it could be because the transmitter in the car has been damaged. It's usually a job that requires a professional. You will require a brand new key fob. If you've tried replacing the battery and reprogram the key fob, but it hasn't worked then the chip in the key fob might be faulty. This can occur if the key fob was dropped on hard surfaces or exposed to salt water or even brushed by dirty hands. To determine the cause of the issue it is necessary to find a small “key” built into the fob's seam that allows you to lift it open and remove the circuit board. Then, you can check the electronic chip for damage or corrosion. To avoid damaging the chip, it is recommended to clean the chip with a new paper towel. You can also take a close look at the battery connector's terminals and determine if they're damaged or cracked. If this is the case you can solder the terminals back to their place will usually restore functionality to the key fob. In the same way, you can examine the buttons to see whether they're worn or damaged. If the buttons are loose, they can be soldered back in place and also if the button is actually snapped off. Interference Signals Few things are more frustrating than staring at the “No Fob Detected” message when you attempt to start your car. This typically happens at most difficult moments, like the time you're late to work or picking up children from daycare/school. There are several things you can try to figure out what's the cause. Interference signals can cause the remote key fob to stop functioning properly. This could be caused by things such as weather conditions, buildings, and transmitters that operate on the same frequency. Interference can also occur when you have aftermarket equipment installed in the vehicle that transmits on the same frequency as the key fob. The key fob can also be damaged if exposed to water or salty water. The rubber seals on the electronic chip can be shattered by water, especially when it is submerged over an extended period of time, like in a pool or at the beach. The chip could stop working and may require replacement of the keyfob. If you have a key that can be programmed and cleaned with isopropyl and electronic cleaners to restore its functionality. If this doesn't work then it's likely that the chip is fried and needs to be replaced. Locking/Unlocking of the Doors The key fob's buttons send electronic signals to a solenoid in the car. It then converts the signal into a mechanical action that locks and unlocks the doors. If the door lock isn't working, the problem could be due to a solenoid problem that requires investigation with the assistance of an expert auto repair shop. A dead 12V battery can also hinder the fob from functioning properly. This can occur if your battery is not charged or if the contacts are corrosion-prone. The good news is that a new battery can fix this problem in just minutes. The receiver module could be the cause of the issue if the key fob doesn't work after you replace the battery or re-program the device. The device detects radio frequency signals sent by the key fob to control the vehicle. If it malfunctions, it can be expensive to repair. To determine if this is true, place your spare key into the key slot. Then turn the ignition ON. Press the key fob twice in a period of 10 seconds, without removing it. The Mazda 3 system synchronizes the key with the vehicle and you can now use it as your primary driving remote. You can program up to three keys in this way.