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Mazda 2 Key Fob ReplacementWhile it can be frustrating to see a device stop working, it's fairly frequent and easily repaired. Most of the time, it's just a changing the battery.Batteries are available at most big-box retailers and hardware stores. You can also find directions in your owner's guide or on YouTube on how to replace the battery by opening the fob.What is a keyless entry system?The keyless entry system you have in your car is a remote control system that allows you to lock and unlock your car without the need to physically insert keys. The keyless entry system is usually installed on a keyfob, or integrated into the ignition key handle. Some models even offer the option of locking remotely the tailgate and trunk.The system works by transmitting a radio signal from your key fob to your car's computer. The car then interprets the radio signal to determine if it is the right key. If it's the correct one the doors will open automatically, and the engine will start. The key fob in itself includes a security chip, or transponder. It prevents the car from starting when the wrong key is used.Keyless entry systems come with advantages and drawbacks. Children can accidentally activate them by playing with them, or they can be turned on even if the owner is not in the vehicle. This can cause power windows and other features of the car to function without the owner's knowledge or consent, and may even set off the alarm.Another issue is that there are a number of ways that thieves could breach the security of keyless entry systems and even hack your vehicle's computer to make it believe your key fob is near enough to be able to start the car. It is vital to have a working fob or backup key.How do I replace my keyless entry system?If the battery in your car's key fob goes out while you're on move, it can be a major problem. Luckily, changing mazda 5 key fob transponder flip key's battery is quite simple. You'll have to know the right method of opening the key fob, and what kind of battery you should purchase.Use a screwdriver with tape wrap to gently open the case starting from one end to the other. Be careful not to damage it. After the case is removed, you can remove the old battery. Put the case where that you will not forget about it. Replace the battery, orienting it to ensure that its positive side is facing upwards.You can also program the replacement fob by writing down the code number on the back of the manual key. While you can duplicate a key made of metal at a hardware shop, most of the modern smart keys require programming by a locksmith or dealer.The cost of replacing a fob, a programming key and mechanical backup keys can add up to the total. If you have an auto club membership or insurance policy to see if it can cover the cost. You might be able to save some money by getting an aftermarket fob on the internet and having it programmed by a locksmith rather than the dealership.How do I program a keyless entry system for my home?In general the same process is used to program key fobs for most major automobile brands. The procedure for certain cars may be different and may require specialized hardware or computer software. In such cases, it would be best to consult the manual or contact an authorized dealer for more assistance.Make sure you have all the materials and tools you require prior to starting. It is recommended to read the manual for the keyless system to better understand how it functions. Installation is fairly simple however you'll need to take off the cover for the steering wheel for access to the wires that are required for connection. Once you have the required wires in place, it's essential to wrap them with electrical tape for protection and insulation.To program a key fob in the new vehicle, insert the original ignition key and turn it on to the "ON" setting (not the "start" or "run") When the key in the ignition is turned on simultaneously press and keep holding both the unlock and lock button of the new remote for 30 minutes. If you do it correctly, the vehicle will sound an alarm and the programming process will be successful. After programming a new keyfob successfully, switch the ignition to "OFF" and test all buttons to confirm that they function.How do I replace the battery in my keyless entry systemReplace the batteries on your keyfob at least every couple of years or when you notice that it is less responsive. This task can be accomplished within less than 10 seconds. Most times you don't have to reset your key fob after replacing the battery.In the beginning, you'll want ensure you have the proper type of battery available. If you flip the key fob, it should have the name of the battery on it. If it's unclear it is possible to use a small flat-head screw driver to remove the key fob to look inside. Key fobs generally accept CR-1620 batteries that are readily available at many stores including Home Depot, Walmart, & AutoZone.You can easily open the key fob after you have removed the mechanical key. Use a screwdriver that is flat or your fingernail for this. Replace the battery you used with the one that you purchased. Make sure that the new battery has its positive (+) side facing up and then reassemble both sides of the key fob, and snap it shut.Certain keys require programming. This can only be accomplished using a specific tool that is available to automotive locksmiths or dealers. However, non-transponder metal keys are not required to be programmed, making them an ideal choice for those who don't have tools needed to program their vehicle.