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Mazda 2 Key Fob Replacement Although it can be a hassle when a device stops working, it's common and can be fixed. It is usually a replacement of the battery. Batteries can be found at the majority of big-box stores 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 system? The keyless entry system inside your car is a remote control system that enables you to lock and unlock your vehicle without the need to physically insert keys. The keyless entry system is typically located on a keyfob or integrated into the ignition key handle. Some models let you choose to remotely secure the tailgate and trunk. The system transmits radio signals to the computer in your car. The car interprets the radio signal to determine if the key is the right key. If it is then, the doors will unlock and the engine will be started. The key fob in itself includes a security chip, also known as a transponder, that prevents the car from starting if the wrong key is used. Keyless entry systems have their advantages and disadvantages. They can be accidentally activated by children playing with them or turned on even when the owner isn't there in the car. This could cause the power windows and other features to function without the owner's permission or knowledge and could even trigger the alarm in the car. There are numerous ways that thieves can hack into the computer of your vehicle to fool it into thinking your key fob is close enough to allow you to start your car. It is therefore important to make sure that you always have a spare fob or key. What can I do to change my keyless access system? If your car's key fob battery fails while you're move, it can be a huge inconvenience. Fortunately, replacing a Mazda 2 transponder flip key's battery is pretty simple. You'll just need to know how to open the key fob and what type of battery you should purchase. You'll need to use an flathead screwdriver wrapped in tape to open the case, starting with one side, then the other, working gently to avoid damaging it. Once the case has been opened, you can remove the battery from the case and place the case somewhere where you'll never lose it. Replace the new battery, but be sure to align it so that the positive side is facing upwards. It's also a good idea to write down the code number on the back of your manual key, to allow you to program the replacement fob using it. While you can duplicate a key made of metal at a hardware store most of the modern smart keys require programming by a locksmith or dealer. The cost of replacing a fob, programming, and a mechanical back-up key can be added to the total. Make sure to check your warranty or auto club membership or insurance policy to determine whether they'll cover the expense. You could be able save some money by getting an aftermarket fob online and having it programmed by a locksmith rather than a dealership. How do I set up a keyless entry system to my home? In general the same process is used to program key fobs for all major auto brands. However, the process for certain vehicles could be a bit different and might require special hardware or software. In these instances you should consult the manual or talk to an authorized dealer for assistance. Before starting, be sure you have all the materials and tools. It is recommended that you read the manual for the keyless system in order to better understand how it functions. Installation is relatively simple however you'll need to remove the cover from the steering wheel for access to the wires necessary for the connection. Wrapping the wires with electrical tape will shield and shield them. To program an entirely new key fob insert the original key into the ignition and then turn it to the “ON” position (not the start or run position). When the key in your ignition is switched on, simultaneously press and keep holding both the unlock and the lock button of the new remote for 30 seconds. If you've done it right the vehicle will chime. The programming process will also be successful. After programming a new keyfob successfully, turn the ignition to “OFF” and test all buttons to ensure that they work. How do I replace the battery in my keyless entry system? Replace the batteries in your keyfob every few years or when you notice it's less responsive. This task can be completed in less than 10 minutes. You don't need to reprogram the key fob each time you change the battery. It is essential to have the correct type of battery on hand. If you flip the key fob over, it should have the battery's type written on it. If the type of battery is not visible you can remove the key fob with a flat-head screwdriver to check inside. Typically, key fobs use batteries CR-1620 that are available at many stores, 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 screw driver that is flathead or your fingernail. Then, take out the battery that was in use, and replace it with the new one you purchased earlier. G28 Car Keys Solutions (+) side of the new battery must be facing up. Reassemble the two sides and then snap it to close. Certain key fobs require programming and can only be done using a special tool that an automotive locksmith or dealer has access to. Non-transponder keys don't require programming, so they are a great option for those who do not have the tools to program their car.