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Changing the Battery in Your Mazda 3 Key FobIt can be a bit frustrating to get into your car at the end of a long, hard day and discover that the key fob is dead. Luckily, it's an easy fix using a simple battery replacement from the hardware store or big box retailer.A spare key fob for your Mazda 3 is an inexpensive option to not have to take your vehicle to a dealer to have them re-program the keys.Battery ReplacementRemoving the battery from your Mazda 3 key fob is a simple process that you can perform at home. However, you should only replace the battery when it is dead, or if the key fob displays a message in the multi-information display that reads, "Low key fob battery. Replace battery."You'll need a flathead screwdriver and tape and patience to open the case. Find a gap or notch in the bottom part of the metal of the Mazda 3's key fob and then insert the head of the screwdriver into it to break off the lower portion. Repeat the process for the top metal piece, but be careful not to scratch the rubber ring at bottom of the key fob's case.Once the fob case is open, you'll see a slot on either side of the case, which houses the battery. Make use of the tape-wrapped flathead screwdriver to gently the case open, starting with one side and moving to the opposite. Remove the old CR2025 and replace it with a brand new one, making sure you put it on its face to ensure proper polarity. Put the cap of the battery on the other side and attach both sides of your key fob case by pressing until they click.After replacing the battery, lock and unlock your doors to ensure whether the fob is working. If everything is in order then your Mazda 3 remote features can be used again.Pairing IssuesIf your key fob stop functioning suddenly it could mean that the transmitter inside your car is damaged. This is usually a matter for a professional and you require a new key fob.If you've attempted to replace the battery and reprogram the key fob, but it's not working, the chip inside the key fob could be faulty. This could happen if the keyfob was dropped, exposed to saltwater, or handled by dirty fingers.To diagnose this issue it is necessary to find a small "key" embedded in the fob's seam which allows you to take it apart and remove the circuit board. You will then be able to check for any damage or corrosion on the chip. It is best to use a clean, dry paper towel to prevent damaging the microchip.If you're unsure, you can also check the battery connector's terminals for cracks or broken. If this is the case then resoldering the terminals into place can usually restore the functionality of the key fob. You can also inspect the buttons for damage or wear. If the buttons are loose they can be soldered back into position, unless they've physically snapped.Interference SignalsThere's nothing more difficult than trying to start your car and then seeing the message "No Fob Detected". It usually happens at the most awkward moments, like the time you're late to work or when you have to pick up children from daycare/school. There are some things you could do to find out what's causing the issue.Interference signals can affect the remote key fob's signal to the vehicle making it unable to function correctly. This can be caused from objects such as weather conditions, buildings and transmitters that operate on the same frequency. Interference may occur if your vehicle is equipped with aftermarket equipment that transmits at the same frequency as your key fob.The key fob can also be damaged if it is exposed to water or salty water. Water can penetrate the rubber seals of the electronic chip, particularly when the key fob is submerged in water for a lengthy period of time. The chip may stop working and may require replacement of the keyfob. If you have a programable key cleaning the chip with isopropyl alcohol or an electronic cleaner to help it return to functionality. If this does nothing, it is likely that the chip has burned out and must be replaced.Locking and Unlocking the DoorsThe key fob's buttons send electronic signals to the solenoid inside the car. It transforms the signal into a mechanical action that locks and unlocks doors. If the door lock isn't working, the issue could be due to a solenoid problem that requires some investigation by an expert auto repair shop.A dead battery of 12 volts can cause the fob to stop functioning correctly. This can occur if your battery fails to charge or if the contacts become corrosion-prone. The good news is that a new battery can fix this problem in just minutes.If the key fob isn't functioning after changing the battery or try to re-program it the problem could be in the receiver module. Going At this website receives radio frequency signals from the key fob and interprets them into controlling the vehicle's functions. It could be expensive to repair if it malfunctions.To determine if this is the case, start by inserting the spare key into the key slot and setting the ignition to ON. Press the key fob two times for 10 seconds without taking it out. The Mazda 3 system will now connect the key to the car and you can use it as your primary remote for driving. You can program up to three keys this way.