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Changing the Battery in Your Mazda 3 Key Fob There is nothing more frustrating than getting to your vehicle after a long work day and discovering that your key fob battery is dead. This is a simple fix that can be done at a big box retailer or hardware store. A spare key fob for your Mazda 3 is an inexpensive way to avoid having to be towed to a dealer to have them re-program the keys. Battery Replacement You can replace the battery on your Mazda 3 keyfob at home. However, you should replace the battery if it dies, or if the key fob shows a message on the multi-information display saying, “Low key fob battery. Replace battery.” You'll need to use a flathead screwdriver and tape and patience to open the case. Find a gap or notch in the bottom portion of the metal of your Mazda 3's key fob, and insert the head of the screwdriver into it to break off the lower part. Repeat the process for the top metal piece Be careful not to damage the rubber ring at the bottom of the case. You'll find a slot on each side of the fob case that houses the battery. Use the tape-wrapped flathead screwdriver to gently pry the case open, beginning at one end and moving to the other. Remove the old battery and then put in a new CR2025, making sure that it's face-up for proper polarity. Finally, put the cap of the battery back on and reattach both sides to the key fob case, pressing until you can hear them click. After replacing the battery Test the fob to confirm it is working by locking and unlocking your doors. If everything is in order you're now able to use your Mazda 3's remote features in the road! Pairing Issues If your key fob stop suddenly, this could indicate that the transmitter inside your car is damaged. It is typically a need for an expert repair and may need a new key fob. If you have tried replacing the battery and reprogramming the key fob, but has not solved the problem it could be that the chip in the key fob is defective. This could happen if the key fob was dropped on hard surfaces or exposed to salt water, or even touched by dirty hands. You'll need the tiny “key”, which is inserted into the seam, in order to remove the circuit board to identify the issue. You can then check the electronic chip for damage or corrosion. visit this web-site is recommended to use a clean towel to avoid damaging the microchip. You can also examine the battery connector's terminals and check if they're cracked or broken. If this is the case you can solder the terminals back into place will typically restore functionality to the key fob. You can also inspect the buttons for wear or damage. If the buttons are loose, they can be soldered back into place and also if the button is actually snapped off. Interference Signals There are few things 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 occasions, such as when you're late for work or pick up your children from school or daycare. The good news is that there are a few steps you can take to troubleshoot the issue and figure out the cause. Interference signals can disrupt the remote key fob signal from the vehicle, causing it to not work correctly. This could be caused by objects like buildings, weather conditions, and transmitters that use the same frequency. Interference can occur if your vehicle is equipped with aftermarket equipment that transmits at the same frequency as your key fob. The key fob could be damaged if exposed to salt water or water. Water can penetrate the rubber seals of the electronic chip, particularly in the event that the key fob is submerged in water for a lengthy period of time. The chip can stop working and may require replacement of the keyfob. If you have a programable key, you can clean the chip using isopropyl alcohol or an electronic cleaner to help it return to functionality. If this does nothing, it is likely that the chip has fried and must be replaced. Locking/unlocking the Doors The buttons on the key fob send electronic signals to the solenoid in the car, which then transforms this signal into a mechanical action. It locks and unlocks doors. If the door lock doesn't work, it could be an issue with the solenoid. This will require expert auto repair shops to investigate. A dead 12 volt can cause the fob to stop working effectively. This happens when the battery loses its charge or the contacts become corroded and stop conducting electricity. The problem can be addressed within a few minutes using a new battery. The receiver module could be the problem if the key fob isn't working after replacing the battery or re-program the device. The device detects radio frequency signals sent by the key fob to control the vehicle. If it malfunctions it could cost a lot to fix. To test if this is correct, place your spare key in the key slot. Then, turn the ignition ON. Press the key fob twice in a period of 10 seconds, without removing it. The Mazda 3 system will now synchronize the key with the vehicle and you can then use it as your primary remote for driving. This lets you program up to three keys.