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Changing the Battery in Your Mazda 3 Key Fob It can be a bit frustrating to get into your car at the end of a long, hard day and find that the key fob is dead. This is a straightforward fix that can be found at a major box retailer or at a hardware store. A spare key fob for your Mazda 3 is an inexpensive method to avoid having to be towed by a dealership to let them re-program your keys. Battery Replacement Removing the battery from your Mazda 3 key fob is an easy procedure that you can do at home. But, you should only replace the battery when it fails, or when the key fob displays a message on the multi-information display, “Low key fob battery. Replace battery.” To open the case of your key fob it requires a tape-wrapped flathead screwdriver and some patience. Insert the head of the flathead screwdriver in a notch or gap on the bottom metal of the Mazda 3 key fob to take off the lower portion. Repeat the procedure for the top piece of metal but be careful not to scratch the rubber ring at the bottom of the case. There's a slot on the opposite side of the case that houses the battery. Use the tape-wrapped flathead screwdriver to gently pry the case open, beginning on one side and then shifting to the other. Take out the old CR2025 and replace it with a brand new one, ensuring that you put it on its face to ensure the correct the polarity. Finally, place the cap of the battery back on and reattach both sides of the key fob's case. Continue pressing until you hear them click. After replacing the battery, lock and unlock your doors to test that the fob is working. If everything is working then you're able to use the Mazda 3's remote features on the road again! Pairing Issues This could indicate that the transmitter in your car is damaged. This is usually a matter for a professional and you will need a new key fob. If you've tried to replace the battery and reprogram the key fob but it's not working it is possible that the chip inside the key fob might be defective. This could happen if the keyfob was dropped, exposed to saltwater, or was touched by dirty fingers. You'll need the tiny “key” that is inserted into the seam, to take off the circuit board and determine the problem. mazda 2 replacement key fob g28carkeys.co.uk will then be able to examine for any corrosion or damage on the electronic chip. It is best to clean the paper towel to ensure that the chip is not damaged. If you're not sure it is possible to check the battery connector's terminals for cracks or breakage. If this is the case then resoldering the terminals to their original position will usually restore the functionality of the key fob. You can also examine the buttons for wear or damage. If the buttons are loose, they can be soldered back regardless of whether a button has physically snapped off. Interference Signals There are few things more difficult than trying to start your car and then seeing the message “No Fob Detected”. This can happen at the most inconvenient possible times, like when you're late to work or pick up your children from daycare or school. The good thing is that there are steps you can take to troubleshoot the issue and determine the root of the problem. Interference signals can cause the remote key fob to stop functioning in a proper manner. This could be caused by things such as 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. In addition, if the key fob is exposed to salt or water water it may be damaged. The rubber seals on the chip's electronic components can be shattered by water, particularly in the event that it is submerged for an extended period of time such as in the ocean or a pool at the beach. This could cause the chip's function to cease, requiring replacement of the key fob. If you have a key which can be programmed or programmed, you can clean it with isopropyl or electronic cleaners to restore its function. If this doesn't work then it's likely that the chip has fried and needs to be replaced. Locking/Unlocking the Doors The buttons on the keys send electronic signals to the solenoid inside the car. It then converts that signal into a mechanical action that locks and unlocks doors. If the door lock doesn't work, it could be an issue with the solenoid. This requires professional repair shops to look into. A low-voltage battery can hinder the fob from functioning correctly. This happens when the battery is unable to charge or the contacts are corroded and stop transmitting electricity. The problem can be addressed in minutes with a new battery. The receiver module may be the problem if the key fob won't work after you replace the battery or re-program the device. The device interprets radio frequency signals sent by the key fob to control the vehicle. It could be a costly repair if it becomes faulty. To determine if this is the case, start by inserting your spare key into the key slot and setting the ignition to ON. Press the key fob button two times within 10 seconds, without removing it. The Mazda 3 system will now be able to synchronize the key with your car, and you can use it as your primary remote for driving. This lets you program up three keys.