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Changing the Battery in Your Mazda 3 Key FobIt's a pain to get in your car at the conclusion of a long and tiring day and discover that the key fob is dead. This is a simple fix that can be found at a big box retailer or hardware store.A spare key fob for your Mazda 3 is an inexpensive way to avoid having to take it to a dealership to have them re-program your keys.Battery ReplacementYou can replace the battery on your Mazda 3 keyfob at home. You should only replace it if the battery dies or if you notice a message stating "Low keyfob battery" on the multi-information display. Replace battery."You'll need a flathead screwdriver and tape and patience to open the case. Put the head of the flathead screwdriver in a notch or gap on the bottom metal of the Mazda 3 key fob to cut off the lower half. Repeat the procedure for the top metal piece however, be careful not to damage the rubber ring that is on the bottom of the case.Once the fob case is open, you'll see an opening on either side of the case, which houses the battery. Use the flathead screwdriver with tape to gently pry the case open, starting at one end and moving to the other. Remove www.g28carkeys.co.uk and put in a new CR2025 to ensure that it's facing up to ensure proper orientation. Finally, place the cap back on and reattach both sides to the key fob's case, pressing until you can hear them click.After replacing the battery check the fob to make sure it works by locking and unlocking your doors. If everything is in order, you can start using the Mazda 3's remote functions on the road again!Pairing IssuesIf your key fob stops suddenly it could mean that the transmitter in the car has been damaged. This is usually a matter for a professional and you will require a brand 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 can happen when the key fob has been dropped on hard surfaces or exposed to saltwater or even touched by dirty hands.You'll need to locate the small "key", which is inserted into the seam, in order to remove the circuit board and diagnose the issue. You can then examine the electronic chip for damage or corrosion. To prevent damaging the chip, it is recommended to use a clean paper towel.If you're unsure you are not sure, you can check the battery connector's terminals for cracks or broken. If this is the situation you can solder the terminals back to their original position will usually bring back functionality to the key fob. It is also possible to check the buttons for damage or wear. If the buttons are loose they can be soldered back into place unless one has physically snapped.Interference SignalsThere's nothing more difficult than trying to start your car and then seeing the message "No Fob Detected". It happens at the worst occasions, such as when you're late to work or you're trying to collect your children from school or daycare. There are some things you could try to figure out the root of the issue.Interference signals can cause the remote key fob to stop working in a proper manner. This can be caused from objects such as weather conditions, buildings and transmitters operating on the same frequency. Interference can also occur if you have aftermarket equipment installed in the vehicle that transmits on the same frequency as the key fob.In addition, if your key fob is exposed to salt or water it may be damaged. The rubber seals on the electronic chip could be shattered by water, especially when it is submerged over an extended period of time, like in the ocean or a pool at the beach. The chip may stop working and may require replacement of the keyfob. If you have a programable key you can clean the chip with isopropyl alcohol or an electronic cleaner to help it come back to normal. If this doesn't help, the chip is likely to be damaged and will need to be replaced.Locking and Unlocking the DoorsThe buttons on the fob's key send electronic signals to the solenoid inside the car, which then transforms the signal into mechanical action. This locks and unlocks doors. If the door lock fails to work it could be due to an issue with the solenoid. This requires experts from repair shops to analyze.A dead 12 volt can cause the fob to stop working properly. This can occur if your battery loses its charge or if your contacts get corroded. The good news is that a new battery is able to fix this problem in just minutes.If the key fob won't work after you change the battery or try to reprogram it the issue could be related to the receiver module. The device detects radio frequency signals sent by the key fob to control the vehicle. It can be a costly repair if it is damaged.To determine if this is true, put your spare key in the key slot. Then turn the ignition on. Press the key fob two times in 10 seconds, without removing it. The Mazda 3 system will now be able to synchronize the key with your car and allow you to use it as your primary remote for driving. This lets you program up three keys.