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Changing mazda 2 key fob battery in Your Mazda 3 Key FobThere is nothing more frustrating than stepping into your car after a long and tiring day and discovering that the key fob battery is dead. Fortunately, this is an easy fix using the simple replacement of a battery at an hardware store or a big box retailer.A spare key fob for your Mazda 3 is an inexpensive alternative to not having to be towed by a dealership to let them re-program your keys.Battery ReplacementChange the battery in the Mazda 3 key fob is an easy procedure that you can perform at home. You should only replace it if the battery fails or you see a message reading “Low keyfob battery” on the multi-information display. Replace battery.”To open the case of your key fob You’ll need a tape wrapped flathead screwdriver, along with some patience. Put the flathead screwdriver’s tip into a notch, or gap on the bottom metal of the Mazda 3 key fob to pry the lower half off. Repeat the procedure for the top piece of metal however, be careful not to scratch the rubber ring on the bottom of the case.There is a slot on both sides of the fob case that houses the battery. Use the tape-wrapped flathead screwdriver to gently pry the case open, beginning with one side and shifting to the other. Remove the old CR2025 and replace it with a brand new one, making sure to place it face-up to ensure proper polarity. Attach the cap to the battery again, and then 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 you can begin using the Mazda 3’s remote features to drive again!Pairing IssuesThis could indicate that the transmitter in your car may have been damaged. It is usually a job to a professional and you will require a new key fob.If you’ve tried replacing the battery and reprogramme the key fob but it’s not working then the chip in the key fob may be defective. This can happen if the keyfob has been dropped or exposed to saltwater or the touch of dirty fingers.You’ll need to find a small “key” that is inserted into the seam, to remove the circuit board and identify the issue. Then, you will be able to look for any corrosion or damage on the chip. It is recommended to use a clean towel to ensure that the chip is not damaged.If you’re unsure then you should also examine the battery connector terminals for cracks or broken. If this is the case, soldering the terminals back to their original position will usually restore the functionality of the key fob. You can also examine the buttons for wear or damage. If the buttons are loose, they can be soldered back into place unless one has physically snapped.Interference SignalsThere is nothing more frustrating than looking at an “No Fob Detected” message when you attempt to start your vehicle. It can happen at the most unfavorable possible times, like when you’re late for work or when you have to pick up your children from school/daycare. The good thing is that there are steps you can take to investigate the issue and determine what is causing it.Interference signals can cause the remote key fob to stop working properly. This could be due to objects such as weather conditions, buildings and transmitters using 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.Additionally, if the key fob is exposed to water or salt water 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 prolonged time. The chip may stop working and may require replacement of the keyfob. If you have a key that has the ability to be programmed, you can clean it with isopropyl or electronic cleaners to restore its function. If this does not help the chip, it is likely to be fried and will require to be replaced.Locking and Unlocking of DoorsThe key fob’s buttons send electronic signals to a solenoid in the car that then transforms the signal into a mechanical action that locks and unlocks doors. If the door lock isn’t working, the issue may be a solenoid issue that requires investigation with the assistance of a professional auto repair shop.A dead 12 volt battery could cause the fob to stop functioning properly. This could happen if the battery has lost its charge or if the contacts are corroded. The problem can be addressed in just a few minutes by purchasing a new battery.The receiver module could be the cause if the key fob isn’t working after you replace the battery or program the device. This device interprets radio frequency signals sent by the key fob to control the vehicle. If it malfunctions it could be costly to repair.To check if this is the case, begin by inserting your spare keys into the key slot and setting the ignition to ON. Press the key fob twice for 10 seconds without removing it. The Mazda 3 system synchronizes the key with the vehicle, so you can use it as your primary driving remote. This allows you to program up to three keys.