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Changing the Battery in Your Mazda 3 Key FobThere’s nothing more frustrating than getting to your vehicle after a long day, and discovering that your key fob battery is dead. Fortunately, this is an easy fix using an easy battery replacement at an electronics store or big box retailer.A spare key fob for your Mazda 3 is an inexpensive method to avoid having to be towed to a dealership to have them re-program the keys.Battery ReplacementYou can replace the battery on your Mazda 3 keyfob at home. However, you should replace the battery when it dies, or if the key fob shows a message on the multi-information display stating, “Low key fob battery. Replace battery.”To open the key fob’s casing, you’ll need a tape-wrapped flathead screwdriver as well as some patience. 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 the procedure for the top piece of metal, but be sure not to scratch the rubber ring at the bottom of the case.There’s a slot both sides of the fob case that houses the battery. Start with one side of the case and gently pry it open. Take out the old CR2025 and replace it with a new one, making sure that you put it on its face to ensure the correct polarity. Then, put the cap of the battery back on and reconnect both sides of the key fob’s case. Continue pressing until mazda key cut can hear them click.After replacing the battery, lock and unlock your doors to verify that the fob is working. If everything is working then you’re able to use the Mazda 3’s remote features in the road!Pairing IssuesThis could mean that the transmitter in your car may have been damaged. This is usually a matter of an expert repair and will likely require a new replacement key fob.If you’ve tried to replace the battery and reprogram the key fob but it’s not working then the chip in the key fob may be faulty. This could be the case if the keyfob was dropped or exposed to saltwater or touched by dirty fingers.To determine the cause To determine the cause, you must locate a small “key” built into the edge of the fob that allows you to open it and remove the circuit board. You can then examine the chip for damage or corrosion. To avoid damaging the microchip, it is recommended to use a clean paper towel.If you’re not sure it is possible to check the battery connector terminals for cracks, or breaks. If this is the case, then carefully connecting them back can generally restore the functionality of the key fob. Also, you can check the buttons to see whether they are worn out or damaged. If they are loose, they can be resoldered into position, unless they’ve physically snapped.Interference SignalsThere’s nothing more frustrating than trying to start your car and then seeing the message “No Fob Detected”. This happens at the worst possible times, like when you’re running late to work or when you have to pick up your children from school/daycare. There are some things you can do to troubleshoot and find out the root of the issue.Interference signals can cause the remote key fob not to function properly. This could be caused by things such as buildings, weather conditions, and transmitters that operate on the same frequency. Interference can occur when your vehicle is equipped with aftermarket equipment that transmits at the same frequency as your key fob.The key fob might be damaged if it is exposed to water or salty water. The rubber seals on the chip’s electronic components can be damaged by water, especially in the event that it is submerged for an extended period of time, like in a pool or ocean at the beach. The chip may cease to function and may require replacement of the keyfob. If you own a programmable key, you can clean the chip using isopropyl alcohol or an electronic cleaner to help it return to working. If this does nothing then it’s likely that the chip has burned out and must be replaced.Locking/unlocking the DoorsThe buttons on the keys send electronic signals to a solenoid in the car. It then converts the signal into a mechanical action that locks and unlocks the doors. If the door lock is not working, the problem could be a solenoid issue that requires investigation with the help of an expert repair shop for autos.A dead 12 volt could also prevent the fob from working properly. This is the case if the battery’s charge is lost or if the contactors are corroded and stop transmitting electricity. This problem can be fixed in a matter of minutes by replacing the battery.If the key fob isn’t functioning after you replace the battery or 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 into controlling the functions of the vehicle. It could be a costly repair if it becomes faulty.To determine whether this is the case, begin by inserting your spare keys into the key slot and turning the ignition to ON. Press the key fob twice in 10 seconds, without removing it. The Mazda 3 system synchronizes the key with the vehicle, so you can use it as your primary remote for driving. This allows you to program up three keys.