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Changing the Battery in Your Mazda 3 Key Fob There's nothing more frustrating than getting in your car after a long day, and realizing that the key fob battery is dead. Fortunately, it is an easy fix by purchasing simple battery replacement from the hardware store or big box retailer. A spare key fob for your Mazda 3 is an inexpensive method to avoid having to take your vehicle by a dealership to let them re-program your keys. Battery Replacement You can replace the battery on your Mazda 3 keyfob at home. But, you should only replace the battery when it is dead, or if the key fob displays a message in the multi-information display, “Low key fob battery. Replace battery.” You'll need to use an flathead screwdriver along with tape and patience to open the case. The head of the flathead screwdriver into a notch, or gap on the bottom metal of the Mazda 3 key fob to take off the lower portion. Repeat the process for the top metal piece, but be sure not to scratch the rubber ring on the bottom of the case. There's a slot on both sides of the fob case that houses the battery. Use the flathead screwdriver with tape to gently the case open, starting at one end and moving to the opposite. Remove the old CR2025 and replace it with a new one, making sure that you put it on its face to ensure proper the polarity. Place the battery cap on again and attach 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 verify whether the fob works. If everything looks good you're now able to use the Mazda 3's remote features on the road again! Pairing Issues This could be a sign that the transmitter in your car has been damaged. This is usually a matter of an expert repair and will likely require a replacement key fob. If you've tried to change the battery and reprogramme the key fob, but it's not working it is possible that the chip inside the key fob may be faulty. This can happen if your keyfob has been dropped, exposed to saltwater, or handled by dirty fingers. To diagnose this issue, you will need to locate a tiny “key” that is embedded into the edge of the fob which allows you to open it and remove the circuit board. Then, you can check the chip for corrosion or damage. It is recommended to use a clean, dry paper towel to ensure that the chip is not damaged. You may also inspect the battery connector's terminals and determine if they're damaged or cracked. If this is the case, then carefully attaching them back can often restore the function of the key fob. You can also check the buttons for wear or damage. If the buttons are loose they can be resoldered to their original position unless they have physically snapped. Interference Signals There's nothing more frustrating than trying to get the engine started in your car and seeing the message “No Fob Detected”. It happens at the worst time, for instance when you're late to work or when you have to pick up your children from school/daycare. There are a few things you can do to help figure out what's causing the problem. Interference signals can interfere with the remote key fob signal coming from the vehicle, causing it to not work correctly. This could be due to objects such as weather conditions, buildings and transmitters using the same frequency. Interference may also occur if you have equipment from an aftermarket manufacturer installed in your vehicle that transmits at the same frequency as the key fob. In addition, if the key fob is exposed to salt or water it may be damaged. Water can damage the rubber seals of the electronic chip, especially if the key fob is submerged in water for a lengthy duration. This could cause the chip to stop working and will require replacement of the key fob. If you own a programmable key you can clean the chip with isopropyl alcohol or an electronic cleaner to aid in its return to working. If this doesn't work will be able to fix the issue, then the chip has fried and needs to be replaced. Locking and Unlocking the Doors The buttons on the key fob send electronic signals to the solenoid inside the car. It transforms the signal into a mechanical action that locks and unlocks the doors. If your door lock does not work, it could be an issue with the solenoid. This requires professional auto repair shops to examine. A dead 12 volt can also prevent the fob from functioning effectively. This could happen if the battery is not charged or if your contacts get damaged. This problem can be fixed in just a few minutes by purchasing a new battery. The receiver module may be the problem if the key fob doesn't work after replacing the battery or re-program the device. mazda 2 car key G28CarKeys interprets radio frequency signals transmitted by the key fob to control the vehicle. It could be a costly repair if it malfunctions. To determine whether this is the case, begin by inserting the spare key into the key slot and turning the ignition to ON. Press the key fob button twice in a matter of 10 seconds without removing it. The Mazda 3 system will now synchronize the key with the car and you can use it as your primary remote for driving. This lets you program up to three keys.