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Changing the Battery in Your Mazda 3 Key Fob There's nothing more frustrating than stepping into your car after a long and tiring day and discovering that the key fob battery is dead. Fortunately, this is simple to fix it with a simple battery replacement from the hardware store or big box retailer. Adding a spare key fob to your Mazda 3 can be an inexpensive way to save yourself from having to be transported to a dealership and having them re-program your keys. Battery Replacement Removing the battery from the Mazda 3 key fob is an easy process that can perform at home. You should only replace it if the battery fails or you see a message saying “Low keyfob battery” on the multi-information display. 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 pry off the lower part. Repeat mazda key fobs g28carkeys.co.uk for the top metal piece however, be careful not to scratch the rubber ring that is on the bottom of the case. There is a slot on each side of the case, where you can find the battery. Use the flathead screwdriver with tape to gently open the case, starting on one side and then moving to the next. Take out the old CR2025 and replace it with a new one, making sure you put it on its face to ensure proper direction of polarity. Finally, put the cap of the battery back on and reattach both sides to the key fob case. Keep pressing until you hear them click. After replacing the battery, lock and unlock your doors to ensure that the fob works. If everything is working then you're able to use the Mazda 3's remote functions for the first time! Pairing Issues If your key fob has stopped working suddenly it could be a sign that the transmitter inside the car has been damaged. It is typically a need for the assistance of a professional for repair and may need a new key fob. If you've tried to replace the battery and reprogram the key fob, but it hasn't worked, the chip inside the key fob could be defective. This could be the case if the keyfob has been dropped, exposed to saltwater, or was touched by dirty fingers. To determine the cause You will need to locate a tiny “key” built into the seam of the fob that allows you to open it and take out the circuit board. You can then check the chip for damage or corrosion. To avoid damaging the chip, it is best to use a fresh paper towel. You can also inspect the battery connector terminals to determine if they're damaged or cracked. If this is the case, carefully connecting them back will usually restore the function of the key fob. You can also inspect the buttons for damage or wear. If they are loose, they can be soldered back into place, unless one has physically snapped. Interference Signals There's nothing more frustrating than trying to get the engine started in your vehicle and getting the message “No Fob Detected”. This usually occurs at the most difficult moments, like the time you're late to work or if you're picking up kids from school/daycare. The good thing is that there are steps you can take to troubleshoot the issue and figure out the cause. Interference signals can cause the remote key fob to stop functioning in a proper manner. This can be caused by things like buildings, weather conditions and transmitters that operate on the same frequency. Interference can also occur when you have aftermarket equipment installed in your vehicle that transmits on the same frequency as the key fob. In addition, if your key fob is exposed to water or salt seawater, it may be damaged. The rubber seals on the electronic chip could be damaged by water, particularly when it is submerged for an extended period of time, like in the ocean or a pool at the beach. This could cause the chip to stop functioning, requiring replacement of the key fob. 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 will be able to fix the issue, then the chip has been damaged and needs to be replaced. Locking/unlocking the Doors The buttons on the key fob transmit electronic signals to the solenoid of the car, which transforms the signal into mechanical action. It locks and unlocks doors. If the door lock is not working, the issue may be a solenoid issue that requires some investigation with the help of a professional auto repair shop. A dead 12 volt battery can hinder the fob from functioning properly. This is the case if the battery loses its charge or if the contacts get corroded and stop transferring electricity. The good news is that a new battery can fix this issue in just minutes. The receiver module may be the cause of the issue if the key fob does not function after replacing the battery or program the device. This device receives radio frequency signals from the key fob and interprets them into controlling the vehicle's functions. If it malfunctions, it can be expensive to fix. To verify if this is true, put your spare key into the key slot. Then, turn the ignition on. Press the key fob twice in a matter of 10 seconds without removing it. The Mazda 3 system will now be able to synchronize the key with your vehicle and you can then use it as your primary remote for driving. This allows you to program up to three keys.