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How to Repair a Remote Key While the majority of remote key fobs have excellent battery life, they will eventually wear out. Sometimes it's as simple as replacing the batteries inside the device, however sometimes the issue could be more serious. Take apart the remote and clean the buttons. Then move them out and in. These methods could be all you need to get your key fob to work. Battery Car key remotes utilize CR2025 or CR2032 batteries and can usually be swapped out if the fob is still operational. If it isn't, you can open the fob and check the battery terminals and buttons for any signs of looseness or broken parts. Most of the time, the buttons and terminals can be soldered back in place, but you'll need to be aware of the exact type of battery is used by your fob. If you're unsure if the battery is the issue you can use a backup fob to start or unlock your car. If you can, then it's time for a replacement of the primary fob. If it's not, a professional inspection is required to determine why it's not functioning properly. It could be as simple as reprogramming, or it could require other types of repair. You may also find that your vehicle has forgotten the fob. This isn't something you can tackle by yourself. Case The case of a remote key is the plastic housing that covers the outside and typically comes with the replacement button pad. It is essential to choose a new case as the original one is likely to be quite dirty, and it is essential that the circuit board is set correctly in the case. The circuit board is what is responsible for controlling the function of the key fob. Read Even more can test it by using an instrument set to RF (radiofrequency) mode, and a radio scanner that is tuned to the same frequency as the key fob. Another thing to examine is the contact points for buttons on the keypad, which could have become damaged or loose in the course of time. Soldering them back into place will often allow them to return to their original functionality, except if they snap completely. Buttons If the buttons on your key fob no longer work or are difficult to press, a dorman or motormite remote key housing replacement can be purchased online for a reasonable price for the year, make and model of your. Then, you can take the circuit board from your old case and put it into the new one. You may have to slightly adjust the position of your circuit board on certain models. You can then use aluminum foil using double-sided tape to adhere it to the black contact points on the buttons. Programming The key fob is linked with the receiver inside your vehicle and this connection can be corrupted. A professional will inspect your car to determine its year, make, and model. They'll then use specialist equipment to recouple or program an unmodified transponder chip or fob (or duplicate the key, if possible). They will then test the remote to make sure that it functions. It is crucial to be cautious when reprogramming an unprogrammed key, since the process is often complicated and different manufacturers have slightly different steps. It is easy to miss a key step or wait too long before exiting the programming mode. To minimize the risk of causing damage to your vehicle it is recommended to work with an expert with vast knowledge of the security system in your vehicle. Certain key programming tools can also read diagnostic trouble codes on your vehicle. This can help you fix or resolve other issues.