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Changing the Battery in Your Mazda 3 Key Fob There is nothing more frustrating than returning to your car after a long work day and discovering that the key fob battery is dead. Luckily, this is simple to fix it with the simple replacement of a battery at a hardware store or big box retailer. A spare key fob for your Mazda 3 is an inexpensive alternative to not having to take it to a dealership in order to have them re-program the keys. Battery Replacement Change the battery in your Mazda 3 key fob is an easy procedure that you can do at home. You should only replace it when the battery is dead or you see a message saying “Low keyfob battery” on the multi-information display. Replace battery.” You'll need to use a flathead screwdriver and tape and patience to open the case. Locate a notch or gap in the bottom part of the metal of the Mazda 3's key fob, and then insert the tip of the screwdriver to cut off the lower part. Repeat the process for the top piece of metal Be careful not to damage the rubber ring on the bottom of the case. There's a slot both sides of the fob case that contains the battery. Make use of the tape-wrapped flathead screwdriver to gently pry the case open, starting on one side and then moving to the other. Take out the old CR2025 and replace it with a new one, ensuring that you place it face-up to ensure the correct direction of polarity. Finally, place the battery cap back on and reattach both sides to the key fob case. Keep pressing until you hear them click. After replacing the battery, test the fob to confirm it works by locking and unlocking your doors. If mazda key fob battery appears to be working then you're able to use your Mazda 3's remote features for the first time! Pairing Issues If your key fob stopped functioning suddenly it could mean that the transmitter in the car has been damaged. It is typically a need for an expert repair and will likely require a new key fob. If you've tried to change the battery and reprogramme the key fob, but it hasn't worked then the chip in the key fob may be faulty. This could happen if the key fob has been dropped on hard surfaces and exposed to salt water or even brushed by dirty hands. To identify the issue To determine the cause, you must find a small “key” built into the edge of the fob which allows you to take it apart and take out the circuit board. You can then check the chip for corrosion or damage. To prevent damaging the chip, it is recommended to use a clean paper towel. If you aren't sure then you should also examine the battery connector terminals for cracks or broken. If this is the case, then carefully reconnecting them can generally restore the functionality of the key fob. Also, you can check the buttons to see whether they've been worn out or damaged. If the buttons are loose, they can be soldered back and also if a button has physically snapped off. Interference Signals There are few things more frustrating than trying to start your car and then seeing the message “No Fob Detected”. This typically happens at most awkward times, such as the time you're late to work or if you're picking up kids from daycare/school. There are a few things you can do to find out the root of the issue. Interference signals can affect the remote key fob signal coming from the vehicle, causing it to not function properly. This can be caused by things like buildings, weather conditions and transmitters that use the same frequency. Interference can occur if your vehicle is equipped with aftermarket equipment that transmits at the same frequency as your key fob. The key fob might be damaged if exposed to water or salty water. Water can damage the rubber seals of the electronic chip particularly when the key fob is submerged in water for an extended duration. The chip can stop working and may require replacement of the keyfob. If you have a programmable key, you can clean the chip with isopropyl alcohol or an electronic cleaner to aid in its get back to its original functionality. If this doesn't work you can be sure that the chip is fried and will need to be replaced. Locking/Unlocking the Doors The buttons on the key fob send electronic signals to the solenoid in the car, which converts this signal into mechanical action. This locks and unlocks doors. If the door lock does not work, it could be an issue with the solenoid. This requires professional repair shops to look into. A dead battery of 12 volts can cause the fob to stop functioning correctly. This can happen when your battery loses its charge or if your contacts become corrosion-prone. The problem can be addressed in just a few minutes by purchasing a new battery. The receiver module may be the reason why the key fob does not function after replacing batteries or reprogram the device. This device interprets radio frequency signals transmitted by the key fob to control the vehicle. If it fails it could be costly to repair. To determine if this is the case, begin by inserting your spare keys into the key slot and setting the ignition to ON. Press the key fob twice in 10 seconds, without removing it. The Mazda 3 system will now connect the key to the vehicle and you can then use it as your primary remote for driving. You can program up to three keys this manner.