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How to Repair a Remote Key Even though most remote key fobs boast an impressive battery lifespan, they eventually wear out. Sometimes it's as easy as changing the batteries, but sometimes there are more serious issues. One quick fix that may aid is to disassemble the remote by cleaning the buttons and stretching them out and in. These methods could be all that you need to get your key fob working properly. Battery Car key remotes are powered by CR2025 or CR2032 batteries and they can be replaced when the fob is functional. If not, you can examine the battery terminals or buttons to see if there are any parts that are loose. Most of the time, the buttons and terminals can be re-soldered back into place, but you'll need to be aware of the type of battery is used by your fob. If you're unsure whether the battery is the problem then utilize a backup fob in order to unlock or start your vehicle. If you are able to do so, it's time for a replacement of the primary fob. If not, a professional inspection is necessary to determine the reason it's not working properly. It could be as simple as reprogramming, or it could require other types of repair. There's also the possibility that your vehicle lost your fob and isn't something you can fix yourself. Case The case of remote keys is the plastic housing that covers the outside and typically comes with the button pad replacement. It is important to use a new case, as the original one is likely to be quite dirty and it is vital that the circuit board is placed correctly inside the case. The circuit board determines the function of the key fob. You can test it 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 look at is the contact points for buttons on the keypad. They might have become loose or broken over time. Soldering car key fob repair in place can often restore them to full functionality, unless they break completely. Buttons IF your key fob buttons do not function anymore or are difficult to press for any reason, a motormite or dorman remote key housing replacement can be purchased online for a reasonable price for the year/make/model you have. Then pop the circuit board out of your old case into the new. You may have to slightly alter the position of the circuit board for certain models. The black contact points of buttons can be adhered to using aluminum foil and double-sided tape. Programming The key fob and receiver inside your car are linked however, this connection may be ruined. A professional will assess your vehicle to determine its year, make and model. They'll then use specialist equipment to reconnect or program an unmodified transponder chip or fob (or clone the key if possible). Then they will test the remote to make sure it functions. It is important to be cautious when reprogramming an unprogrammed key, since the process is often complicated and different manufacturers require distinct steps. It is easy to miss a key step or to take too long to exit the programming mode. To reduce the chance of damaging your car it is recommended to hire an expert with vast knowledge of the security system of your vehicle. Some key programming tools can also read diagnostic trouble codes on your vehicle. This will help you fix or resolve other issues.