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How to Repair a Remote Key Even though most remote key fobs have amazing battery life, they will eventually get worn out. Sometimes it's simple to replace the batteries in the device, however sometimes the issue could be more serious. Remove the remote from the unit and clean the buttons. Then move them in and out. These methods could be all you need to get the key fob working. Battery Car key remotes are powered by CR2025 or CR2032 batteries and they can be replaced in the event that the device is functional. If not, look at the battery terminals and buttons to determine if there are any parts that are loose. It is usually possible to solder the buttons and terminals back into their original positions. However, you will need to know what type of battery is installed in the fob. If the battery isn't the issue you can try an alternate key fob to determine if you can start or unlock your vehicle using it. If automotive key repair , it's time to replace the primary fob. If not, a professional inspection is necessary to determine the reason it's not functioning properly. It could be as simple as reprogramming, or it could require other types of repair. There's also the possibility that your vehicle forgotten your fob and isn't something you can fix yourself. car key immobiliser repair Study The plastic housing that covers the outside of a remote is called the case. It typically comes with an alternative button pad. It is recommended to use the latest case because the one you have case is likely to be quite filthy. Also, it is vital that the circuit board within the case is placed correctly. The circuit board is responsible for the operation of the key fob. It is tested using a normal multimeter by setting it to the RF (radio frequency) mode and then holding a radio scanner tuned to the frequency the key fob is using next to it, listening for pulsing signals upon pressing the button. Check the contact points of the keys on the keypad. They may have become loose over time or have been damaged. Soldering them back to their original position can often restore them to full functionality, except if they snap completely. Buttons If your key fob buttons do not function anymore or are difficult to press for any reason, a motormite or dorman key housing replacement for your remote can be bought inexpensively online for the year/make/model you have. Then, simply pop the circuit board from your old case into the new one. It is possible to alter the position of the circuit board on certain models. You can then use aluminum foil with double sided tape to adhere to the black contact points on the buttons. Programming The key fob and receiver inside your car are paired however this connection could be corrupted. A professional will examine your car to determine the year, make, and model. They will then employ specialist equipment to reconnect or program a blank transponder chip or fob (or duplicate the key if possible). They will then test the remote to confirm that it works. When programming blank keys it is essential to take care. The process is complicated and each manufacturer offers different instructions. It is easy to miss a crucial step or to wait too long to exit the programming mode. To reduce the chance of causing damage to your vehicle it is recommended to work with an expert who has extensive knowledge of the security system in your vehicle. Some key programming tools are also capable of analyzing diagnostic trouble codes from your vehicle, which can help repair or troubleshoot further issues.