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Changing the Battery in Your Mazda 3 Key Fob There's nothing more annoying than stepping into your car after a long work day and discovering that the key fob battery is dead. Fortunately, it is simple to fix it with the simple replacement of a battery at the hardware store or big box retailer. A spare key fob for your Mazda 3 is an inexpensive option to not have to take it to a dealership in order to have them re-program the keys. Battery Replacement The battery replacement in the Mazda 3 key fob is a simple process that you can do at home. However, you should replace the battery if it is dead, or if the key fob shows a message on the multi-information display that reads, “Low key fob battery. Replace battery.” To open the key fob case you'll need a tape-wrapped flathead screwdriver, along with some patience. Locate a notch or gap in the bottom portion of the metal of your Mazda 3's key fob and insert the head of the screwdriver to cut off the lower part. Repeat this process for the top metal part however, be careful not to scratch the rubber ring that is at the bottom of the key fob's case. When the fob case is open, you'll find the slot on either side of the case, which houses the battery. Use the flathead screwdriver with tape to gently the case open, starting on one side before shifting to the other. Remove the old battery and put in the new CR2025, making sure that it's facing upwards to ensure proper polarity. Finally, place the cap on the battery and reattach both sides to the key fob's case. Continue pressing until you can hear them click. Now that you've replaced the battery Check the fob to verify that it works by locking and unlocking your doors. If everything is in order you're now able to use your Mazda 3's remote features to drive again! Pairing Issues If your key fob stop working suddenly it could mean that the transmitter inside the car is damaged. This typically requires an expert repair and will likely need a new key fob. If you've tried replacing the battery and programming the key fob but does not solve the issue it is possible the chip inside the key fob may be damaged. This can happen if the keyfob was dropped, exposed to saltwater, or was touched by dirty fingers. You'll need to find a small “key” that is built into the seam, in order to remove the circuit board to identify the problem. You will then be able check for any corrosion or damage on the electronic chip. To avoid damaging the chip, it's recommended to clean the chip with a new paper towel. You can also take a closer look at the battery connector's terminals and see if they are cracked or broken. If this is the case it is possible to solder the terminals back to their original position will usually bring back functionality to the key fob. Additionally, you can look at the buttons to determine whether they've been worn out or damaged. If the buttons are loose, they can be resoldered to their original position unless they have physically snapped. Interference Signals There is nothing more frustrating than gazing at the “No Fob Detected” message when trying to start your car. This typically happens at most inconvenient times, such as when you're late for work or when you are picking up your children from school/daycare. There are a few things you can do to find out what's causing the issue. Interference signals can disrupt the remote key fob signal coming from the vehicle which causes it to not function properly. This can be caused by things like weather conditions, buildings and transmitters that operate on the same frequency. Interference may also occur if you have aftermarket equipment installed in your vehicle that transmits on the same frequency as the key fob. The key fob could be damaged if exposed to salt water or water. The rubber seals on the electronic chip can be damaged by water, especially if it is submerged for an extended period of time, like in a pool or ocean at the beach. This could cause the chip to stop working, requiring replacement of the key fob. If you have a programmeable key it is possible to clean the chip with isopropyl Alcohol or an electronic cleaner to aid in its come back to normal. If this doesn't work you can be sure that the chip has fried and needs to be replaced. Locking and Unlocking of Doors The buttons on the key fob send electronic signals to a solenoid within the car. It then transforms the signal into a mechanical action that locks and unlocks doors. If the door lock isn't working, the problem may be a solenoid issue that requires investigation with the help of an expert repair shop for autos. A dead 12V battery can cause the fob to stop functioning properly. This could happen if the battery's charge is lost, or if the contacts get corroded and stop transferring electricity. This issue can be solved in just a few minutes by purchasing a new battery. If the key fob isn't working after changing the battery or re-program it the problem could be in the receiver module. The device interprets radio frequency signals sent by the key fob to control the vehicle. If it fails, it can be expensive to repair. To verify if this is true, place your spare key in the key slot. Then turn the ignition on. Press the key fob two times within 10 seconds, but without removing it. 2011 mazda 3 key fob will now sync the key to the car, and you can use it as your primary remote for driving. This lets you program up three keys.