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Changing the Battery in Your Mazda 3 Key Fob It's frustrating to pull into your car at the end of a long, hard day and discover that your key fob is dead. This is a straightforward solution that can be accomplished at a big box retailer or at a hardware store. A spare key fob for your Mazda 3 is an inexpensive method to avoid having to take it to a dealership to have them reprogram the keys. Battery Replacement You can change the battery on your Mazda 3 keyfob at home. It is recommended to replace it when the battery is dead or you get a message that reads “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. Locate a notch or gap in the bottom part of the metal of the Mazda 3's key fob, and then insert the head of the screwdriver in it to pry off the lower portion. Repeat this procedure for the top metal piece however, be careful not to damage the rubber ring at bottom of the key fob's case. You'll find a slot on the opposite side of the case that contains the battery. Make use of the tape-wrapped flathead screwdriver to gently open the case, beginning at one end and moving to the next. Take out the old CR2025 and replace it with a new one, making sure to place it face-up to ensure proper direction of polarity. Finally, place the cap on the battery and then reattach both sides of the key fob's case. Continue pressing until you can hear them click. After replacing the battery after replacing the battery, lock and unlock your doors to confirm that the fob is working. If everything is in order then you can begin using the Mazda 3's remote features on the road again! Pairing Issues If your key fob stopped working suddenly it could be because the transmitter inside the car is damaged. This is usually a matter of an expert to repair it and will likely require a replacement key fob. If you've tried replacing the battery and programming the key fob, but this isn't solving the issue it is possible that the chip inside the key fob could be damaged. This can occur if the key fob has been dropped on hard surfaces or exposed to salt water or even brushed by dirty hands. You'll need to find an extremely small “key” that is built into the seam to remove the circuit board to identify the issue. You will then be able to check for any damage or corrosion on the electronic chip. It is best to use a clean, dry paper towel to keep the microchip from being damaged. If you're unsure, you can also check the battery connector's terminals for cracks, or breaks. If mazda 2 key is the case it is possible to solder the terminals back into place can usually restore the functionality of 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 in place regardless of whether the button is physically snapped off. Interference Signals There's nothing more frustrating than trying to get the engine started in your car and seeing the message “No Fob Detected”. This can happen at the most inconvenient time, for instance the time you're late to work or have to pick up your children from daycare or school. There are some things you could do to troubleshoot and find out what's causing the problem. Interference signals can cause the remote key fob to stop working properly. This could be caused by things such as buildings, weather conditions and transmitters that use the same frequency. Interference may also occur if you have an aftermarket device installed in the vehicle that transmits at the same frequency as the key fob. In addition, if the key fob is exposed to water or salt seawater, it may be damaged. Water can damage the rubber seals of the electronic chip particularly if the key fob is submerged in water for a lengthy period of time. This can cause the chip to cease working, requiring replacement of the key fob. If you own a programmable key cleaning the chip with isopropyl Alcohol or an electronic cleaner to help it come back to normal. If this doesn't help, it is likely that the chip is fried and will need to be replaced. Locking and Unlocking the Doors The buttons on the key fob send electronic signals to the solenoid inside the car, which converts 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 assistance of an expert auto repair shop. A dead 12 volt could also prevent the fob from functioning properly. This could happen if the battery is not charged or if your contacts get corroded. The good news is that a new battery is able to fix this problem in just minutes. The receiver module could be the problem if the key fob isn't working after you replace the battery or program the device. This device receives radio frequency signals from the key fob and interprets them to control the functions of the vehicle. If it breaks down it could be costly to repair. To check whether this is the case, start by inserting your spare keys into the key slot and setting the ignition to ON. Press the key fob two times in 10 seconds, without removing it. The Mazda 3 system synchronizes the key to the vehicle and you can now use it as your primary driving remote. This allows you to program up three keys.