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G28 While it is frustrating to have a fob stop working, it's common and can be easily repaired. In most cases, it's a an issue of replacing the battery. You can find replacement batteries at most hardware stores and big-box retailers. You can also look in your owner's manual or on YouTube for directions on how to open the fob and replace the battery. What is a keyless entry system? The keyless entry system you have in your car is a remote control system that lets you to lock and unlock your car without the need to physically insert the keys. The keyless entry system is usually located on a keyfob or integrated into the ignition key handle. Some models let you choose to remotely lock the trunk and tailgate. The system works by sending a radio signal from your key fob to the car's computer. The car reads the radio signal to determine if the key is the right key. If it is then the doors will unlock and the engine can be started. The key fob also contains the transponder or security chip to prevent the vehicle from starting if the wrong key is used. Keyless entry systems have advantages and disadvantages. They are prone to being accidentally activated by children playing with them or switched on when the owner isn't present in the vehicle. This could cause power windows and other functions of the vehicle to operate without the owner's consent or knowledge, and may even set off the alarm. Another issue is that there are a number of ways thieves can breach the security of keyless entry systems and hacked into the computer of your vehicle to make it believe that your fob is near enough to enable the car to start. Therefore, it is important to ensure that you have a backup working fob or key. How do I change my keyless access control system? It can be a major inconvenience if your key fob battery goes out while you're traveling. Fortunately, changing the Mazda 2 transponder flip key's battery is pretty simple. You'll just need to know how to open the key fob as well as which type of battery you should purchase. Make use of a tape-wrapped screwdriver gently pry the case open starting from one end to the other. Be careful not to break it. Once the case is opened you can take off the battery that was in it and put it in the case where you'll not lose it. Replace the new battery, being sure to place it in a way that the positive side faces upwards. You can also program your replacement fob by writing down the code on the back of the manual key. Note that while you can copy an old car key at hardware stores, a lot of the latest smart keys require programming by a locksmith or dealer. The cost of a brand new fob, program, and a mechanical backup key could add up. If you have an auto club membership or insurance policy, check to see if it will pay for the cost. You might be able save money by purchasing an aftermarket fob online and having it programmed by a locksmith, rather than the dealership. How do I set up an entry system that is keyless for my home? Generally, the same steps can be used to program a key fob on most major car models. The procedure for certain cars might be different and may require specialized hardware or computer software. In these cases it is recommended to read the manual, or contact an authorized dealer further assistance. Be sure to have the tools and materials that you need before starting. It is recommended to study the instruction manual for the keyless entry system to gain more understanding of how it works. Installation is simple however the cover for the steering wheel needs to be removed to access the wires that will be used to connect. Wrapping the wires with electrical tape will shield and protect them from damage. To program a key fob for a new vehicle, insert the ignition key that was originally used and turn it to the “ON” setting (not the “start” or “run”) While the key in the ignition is on, simultaneously press and keep holding both the unlock and the lock button of your new remote for 30 minutes. If you've done it correctly your vehicle will sound. The process of programming is also successful. After programming a new keyfob successfully turn the ignition to “OFF” and test all buttons to ensure that they function. How do I replace the battery in my keyless entry system Every few years or when the key fob appears to become less responsive, you'll have to replace the batteries in your key fob. This task can be completed in less than 10 minutes. You don't need to reprogram the key fob every time you replace the battery. The first step is to ensure you have the appropriate type of battery in your inventory. If you flip the key fob, it should have the name of the battery on it. If the battery type is not legible then you can open the key fob with an flat-head screwdriver and look inside. Key fobs generally accept the CR-1620 batteries, which are readily available in many shops, including Home Depot Walmart & AutoZone. After you've removed the mechanical key from the key fob you can easily open it by making use of a flathead screw driver or your fingernail. Replace the old battery with the one you purchased. Make sure the new battery has its positive (+) side facing up and then reassemble both sides of the key fob and snap to close it. Certain key fobs require programming, which can only be accomplished with a special tool that an automotive locksmith or dealer has access to. However, non-transponder key fobs don't require to be programmed, making them an excellent choice for people who don't have tools needed to program their vehicle.