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Changing the Battery in Your Mazda 3 Key Fob There's nothing more annoying than getting to your vehicle after a long day and discovering that your key fob battery is dead. This is a simple solution that can be accomplished at a big box retailer or at a hardware store. A spare key fob for your Mazda 3 is an inexpensive way to avoid having to take your vehicle to a dealership in order to have them re-program your keys. Battery Replacement Removing the battery from your Mazda 3 key fob is an easy process that can perform at home. However, you should only replace the battery if it fails, or when the key fob shows a message on the multi-information display saying, “Low key fob battery. Replace battery.” To open the key fob case You'll need a tape wrapped flathead screwdriver as well as some patience. Find a gap or notch in the bottom of the metal part of your Mazda 3's key fob, and insert the head of the screwdriver into it to pry off the lower portion. Repeat the process for the top piece of metal Be careful not to damage the rubber ring at the bottom of the case. There's a slot on both sides of the fob case that houses the battery. Make use of the tape-wrapped flathead screwdriver to gently pry open the case, starting at one end and moving to the other. Remove the battery that was used and place in a new CR2025 and make sure it's in the right orientation for the correct polarity. Then, put the cap of the battery back on and then reattach both sides of the key fob's case, pressing until you hear them click. After replacing the battery after replacing the battery, lock and unlock your doors to confirm that the fob works. If everything appears to be working then you're able to use your Mazda 3's remote capabilities in the road! Pairing Issues If your key fob stop working all of a sudden, this could indicate that the transmitter inside your car is damaged. This is usually a matter of the assistance of a professional for repair and will likely require a replacement key fob. If you have tried replacing the battery and programming the key fob, but isn't solving the issue it could be that the chip inside the key fob may be damaged. This could be the case if the keyfob has been dropped, exposed to saltwater, or was touched by dirty fingers. To determine the cause To determine the cause, you must locate a small “key” that is embedded into the edge of the fob that lets you take it apart and remove the circuit board. You will then be able check for any damage or corrosion on the chip. To prevent damaging the chip, it's recommended to clean the chip with a new paper towel. If you are unsure it is possible to check the battery connector terminals for cracks or broken. If this is the case, carefully attaching them back can often restore the function of the key fob. Also, you can check the buttons to determine whether they've been worn out or damaged. If the buttons are loose, they can be soldered back into place and also if the button has actually snapped off. Interference Signals There are few things more frustrating than glancing at an “No Fob Detected” message when you attempt to start your car. It can happen at the most unfavorable situations, like when you're running late to work or pick up your children from school or daycare. There are a few things you can try to figure out what's the cause. Interference signals can cause the remote key fob not to function in a proper manner. This can be caused by objects such as weather conditions, buildings as well as transmitters operating on the same frequency. Interference can also occur when you install aftermarket equipment in the vehicle that transmits at the same frequency as the key fob. The key fob may also be damaged if it is exposed to salt water or water. Water can get into the rubber seals of the electronic chip, particularly when the key fob has been submerged in water for an extended duration. The chip could stop working and require replacement of the keyfob. If you have a key that can be programmed and cleaned with isopropyl and electronic cleaners to restore its function. If this doesn't work the chip, it's likely to be fried and will require to be replaced. Locking and Unlocking the Doors The buttons on the key fob send electronic signals to the solenoid of the car, which then transforms this signal into a mechanical action. It locks and unlocks doors. If the door lock is not working, the issue could be a solenoid issue that requires investigation by an expert repair shop for autos. A dead 12 volt battery could also stop the fob from functioning properly. This could happen if your battery loses its charge or if the contacts are corrosion-prone. This problem can be fixed within a few minutes using a new battery. The receiver module could be the problem if the key fob won't work after you replace the battery or re-program the device. This device interprets radio frequency signals sent by the key fob to control the vehicle. It could be a costly repair if it is damaged. To check if this is the case, begin by inserting your spare keys into the key slot and turning the ignition to ON. Press site web in 10 seconds, without taking it out. The Mazda 3 system will now connect the key to the car and allow you to use it as your primary remote for driving. This lets you program up three keys.