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Changing the Battery in Your Mazda 3 Key Fob It can be a bit frustrating to drive off at the end of a long workday and find that the key fob is dead. Fortunately, this is an easy fix by purchasing an easy battery replacement at an hardware store or a big box retailer. A spare key fob for your Mazda 3 is an inexpensive option to not have to be towed by a dealership to let them re-program the keys. Battery Replacement Changing the battery in your Mazda 3 key fob is an easy procedure that you can perform at home. You should only replace it when the battery goes out 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. Place the flathead screwdriver's head in a notch or gap on the bottom of the metal of the Mazda 3 key fob to cut off the lower half. Repeat this process for the top metal piece, but be careful not to damage the rubber ring at bottom of the key fob's case. There's a slot on both sides of the fob case, where you can find the battery. Make G28CarKeys of the tape-wrapped flathead screwdriver to gently the case open, starting at one end and moving to the opposite. Take out the old CR2025 and replace it with a brand new one, making sure to put it on its face to ensure proper direction of polarity. Place the battery cap on again and secure both sides of your key fob case by pressing until they click. After replacing the battery Test the fob to verify that it functions by locking and unlocking your doors. If everything appears to be working then you can begin using the Mazda 3's remote features on the road again! Pairing Issues This could mean that the transmitter inside your car is damaged. This is usually a matter to a professional and you will require a new key fob. If you have tried replacing the battery and programming the key fob, but it did not resolve the issue it could be that the chip in the key fob might be defective. This could be the case if the keyfob has been dropped, exposed to saltwater, or touched by dirty fingers. You'll need to find the small “key”, which is inserted into the seam, to remove the circuit board to identify the issue. You can then check the chip for corrosion or damage. It is best to use a clean, dry paper towel to ensure that the chip is not damaged. If you aren't sure it is possible to check the battery connector terminals for cracks or breakage. If this is the case, then carefully attaching them back can usually restore the function 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 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”. It can happen at the most unfavorable time, for instance when you're running late to work or you're trying to collect your children from school/daycare. There are a few things you can try to figure out what's causing the problem. Interference signals can affect the remote key fob signal coming from the vehicle which causes it to not function properly. It can be caused by objects such as weather conditions, buildings, and transmitters operating on the same frequency. Interference may also occur if you have aftermarket equipment installed in your vehicle that transmits at 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 damaged by water, particularly when it is submerged for an extended period of time like in a pool or at the beach. This could cause the chip's function to cease and will require replacement of the key fob. If you have a key that can be programmed and cleaned using electronic cleaners or isopropyl to restore its function. If this does nothing you can be sure that the chip is fried and needs to be replaced. Locking/unlocking the Doors The buttons on the fob's key send electronic signals to the solenoid in the car, which converts the signal into mechanical action. This locks and unlocks doors. If the door lock fails to work it could be because of an issue with the solenoid. This will require professional auto repair shops to investigate. A dead 12 volt battery could also stop the fob from functioning effectively. This is the case if the battery loses charge or if the contacts become corroded, and stop transferring electricity. The good news is that a new battery can resolve this issue in a matter of minutes. If the key fob doesn't work after you have changed the battery or try to program it again then the problem may be with the receiver module. This device receives radio frequency signals from the key fob and interprets them to control the functions of the vehicle. It could be a costly repair if it becomes faulty. To confirm if this correct, place your spare key into the key slot. Then turn the ignition ON. Press the key fob two times for 10 seconds without taking it out. The Mazda 3 system will now synchronize the key with the car and allow you to use it as your primary remote for driving. You can program up to three keys in this manner.