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Changing the Battery in Your Mazda 3 Key Fob It's a pain to drive off at the conclusion of a long and tiring day and discover that your key fob is dead. This is a simple fix that can be found at a big box retailer or hardware store. A spare key fob for your Mazda 3 is an inexpensive way to avoid having to take your vehicle by a dealership to let them reprogram the keys. Battery Replacement Changing the battery in your Mazda 3 key fob is a simple process that you can do at home. However, you should replace the battery if it fails, or when the key fob shows a message on the multi-information display that reads, “Low key fob battery. Replace battery.” You'll need to use a flathead screwdriver and tape and patience to open the case. Locate a notch or gap in the bottom of the metal part of the Mazda 3's key fob and insert the head of the screwdriver into it to remove the lower portion. Repeat this step for the top part of the metal Be careful not to scratch the rubber ring at the bottom of the key fob's case. Once the fob case has been open, you'll be able to see the slots on either side of the case, which houses the battery. Use the tape-wrapped flathead screwdriver to gently pry open the case, starting on one side before moving to the opposite. Remove the old battery, and put in the new CR2025 to ensure that it's facing up to ensure the correct orientation. Install the cap on the battery again and secure both sides of your key fob case by pressing until they click. After replacing the battery after replacing the battery, lock and unlock your doors to ensure that the fob works. If everything appears to be working then you can begin using your Mazda 3's remote capabilities on the road again! Pairing Issues If your key fob stops functioning suddenly, this could indicate that the transmitter inside the car is damaged. It is usually a job for a professional and you will need a new key fob. If you've tried to replace the battery and reprogramme the key fob, but it hasn't worked it is possible that the chip inside the key fob might be defective. This could be the case if the keyfob was dropped, exposed to saltwater, or was touched by dirty fingers. To determine the cause You will need to find a small “key” that is embedded into the fob's seam which allows you to open it up and remove the circuit board. You will then be able to examine for any corrosion or damage on the electronic chip. To avoid damaging the chip, it's best to use a fresh paper towel. It is also possible to examine the battery connector's terminals to see if they are damaged or cracked. If this is the case, carefully connecting them back can usually restore the function of the key fob. In the same way, you can examine the buttons to determine whether they're worn or damaged. If the buttons are loose they can be soldered back into place unless one has physically snapped. Interference Signals There are few things more frustrating than looking at an “No Fob Detected” message when trying to start your vehicle. This typically happens at most difficult moments, such as when you're running late for work or when you have to pick up children from daycare or school. The good thing is that there are steps you can take to pinpoint the issue and figure out the root of the problem. Interference signals can interfere with the remote key fob's signal to the vehicle which causes it to not work correctly. It can be caused by objects such as weather conditions, buildings, and transmitters that operate on the same frequency. Interference can occur if your vehicle is equipped with aftermarket equipment that transmits at the same frequency as your key fob. In addition, if the key fob is exposed to water or salt waters, it could be damaged. The rubber seals on the chip's electronic components can be penetrated by water, particularly if it is submerged for long periods of time such as in a swimming pool or at the beach. The chip can stop working and require replacement of the keyfob. If you have a programable key you can clean the chip with isopropyl Alcohol or an electronic cleaner to help it return to working. If this doesn't help will be able to fix the issue, then the chip has fried and must be replaced. Locking/unlocking the Doors The key fob's buttons send electronic signals to a solenoid in the car that then converts that signal into a mechanical action that locks and unlocks doors. If your door lock doesn't work it could be due to an issue with the solenoid. This requires experts from auto repair shops to investigate. A low-voltage battery can also stop the fob from functioning correctly. This can happen when your battery is not charged or if the contacts are damaged. mazda 3 key G28 can be resolved in just a few minutes by purchasing a new battery. If the key fob won't work after you replace the battery or try to program it again the problem could 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. If it breaks down, it can be expensive to fix. To determine 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 within 10 seconds, but without removing it. The Mazda 3 system will now sync the key to the car, and you can use it as your primary remote for driving. You can program up to three keys in this manner.