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Changing the Battery in Your Mazda 3 Key Fob It's frustrating to pull into your car at the conclusion of a long and tiring day and find that the key fob is dead. This is a straightforward fix that is easily done at a big box retailer or hardware store. A spare key fob for your Mazda 3 is an inexpensive way to avoid having to be towed to a dealer to have them re-program your keys. Battery Replacement You can change the battery on your Mazda 3 keyfob at home. It is recommended to replace it if the battery dies or if you get a message that reads “Low keyfob battery” on the multi-information display. Replace battery.” To open the key fob case you'll need a tape-wrapped flathead screwdriver and a bit of patience. Place the flathead screwdriver's head in a notch, or gap on the bottom metal of the Mazda 3 key fob to take off the lower portion. Repeat this step for the top portion of the metal Be careful not to scratch the rubber ring that is at the bottom of the key fob's case. You'll find a slot on each side of the fob case, which houses the battery. Make use of the tape-wrapped flathead screwdriver to gently pry open the case, beginning on one side before moving to the other. Remove the old battery and put in a new CR2025 and make sure it's facing up to ensure the correct polarity. Then, put the battery cap back on and reattach both sides of the key fob case, pressing until you hear them click. After replacing the battery, lock and unlock your doors to test that the fob is working. If everything looks good, your Mazda 3 remote features can be used again. Pairing Issues This could mean that the transmitter in your car is damaged. www.g28carkeys.co.uk is usually a job to a professional and you will need a new key fob. If you've attempted to replace the battery and reprogram the key fob, but it hasn't worked it is possible that the chip inside the key fob might be faulty. This can happen if the key fob has been dropped on hard surfaces and exposed to salt water or even touched by dirty hands. You will need to locate the tiny “key” that is built into the seam, in order to remove the circuit board and identify the issue. Then, you can examine the electronic chip for damage or corrosion. To prevent damaging the chip, it's recommended to clean the chip with a new paper towel. You can also take a close look at the battery connector's terminals to examine if they're damaged or cracked. If this is the case it is possible to solder the terminals back to their original position will usually bring back functionality to the key fob. In the same way, you can examine the buttons to see if they are worn or damaged. If the buttons are loose, they can be soldered back into place and also if the button is physically snapped off. Interference Signals There's nothing 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 when you're running late for work or if you're picking up kids from daycare or school. There are a few things you can try to figure out the root of the issue. Interference signals can interfere with the remote key fob's signal from the vehicle and cause it to not function properly. This could 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 salt or water seawater, it may be damaged. Water can get into the rubber seals of the electronic chip, especially when the key fob is submerged in water for a long time. This could cause the chip to cease working, requiring replacement of the key fob. If you have a key that can be programmed, you can clean it with isopropyl or electronic cleaners to bring it back to its original functionality. If this doesn't help the chip, it is likely to be damaged and needs to be replaced. Locking and unlocking of the Doors The buttons on the fob's key send electronic signals to the solenoid of the car, which then converts this signal into mechanical action. This locks and unlocks doors. If your door lock does not work, it could be an issue with the solenoid. This requires experts from repair shops to look into. A dead 12 volt could also hinder the fob from working properly. This happens when the battery is unable to charge or if the contacts become corroded, and stop transferring electricity. The good news is that a new battery is able to resolve this issue in a matter of minutes. The receiver module may be the problem if the key fob isn't working after you replace the battery or reprogram the device. The device detects radio frequency signals sent by the key fob to control the vehicle. If it malfunctions it could cost a lot to repair. To confirm if this correct, place your spare key in the key slot. Then turn the ignition ON. Press the key fob two times within 10 seconds, but without taking it out. The Mazda 3 system synchronizes the key to the vehicle and you can now use it as your primary driving remote. This lets you program up to three keys.