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How to Repair a Remote Key While the majority of remote key fobs are equipped with excellent battery life, they will eventually wear out. Sometimes it's as easy as changing the batteries, but sometimes there are more serious problems. One quick fix that may help is dismantling the remote and cleaning the buttons before moving them in and out. These steps could be all that you need to get your key fob working properly. Battery Car key remotes use CR2025 or CR2032 batteries and can usually be replaced in the event that the device is functioning. If not, look at the battery terminals and buttons to see if there are any missing parts. You should be able to solder the terminals and buttons back into their original positions. However, you will be required to know which kind of battery is being used in your fob. If you're unsure whether the battery is the problem then make use of a backup fob to start or unlock your vehicle. If you're able to do so, it's probably time to replace the primary fob. If not, a professional check is needed to figure out why it's not working correctly. It could be as simple as reprogramming it, or require other types of repair. You may also find that your car has lost the fob. This is not something you can do by yourself. Case The outer plastic enclosure of a remote is called the case. It is usually equipped with a replacement button pad. It is essential to choose an entirely new case since the original one is likely to be pretty grungy and it is vital that the circuit board is installed properly in the case. The circuit board is responsible for the function of the key fob and can be tested with a normal multimeter by setting it to RF (radio frequency) mode and holding a scanner tuned to the same frequency the key fob operates on next to it, listening for pulsing signals upon pressing the button. Examine the contact points of the buttons on the keypad. car key fob repairs may be loose over time, or even broken. car key fob repairs soldering process to put them back in place can often return them to their original function unless they break completely. Buttons IF your key fob buttons no longer work or are difficult to press for any reason, a motormite or dorman remote key housing replacement could be bought inexpensively online for the year, make and model of your. Then, pop the circuit board out of your old case and into the new one. It is possible to adjust the position of the board on some models. The black contact points of the buttons can be adhered to with aluminum foil and double-sided tape. Programming The key fob is linked with the receiver in your vehicle. This connection could be damaged. A professional will assess the car to determine the manufacturer, year, year and model and make use of specialist equipment to repair or program an empty fob or transponder chip (or duplicate a key if this is possible). They will then test the remote to confirm that it works. When reprogramming blank keys, it is important to be careful. The process is complicated and each manufacturer offers slightly different instructions. It is also easy to skip a step or wait too long before exiting the programming mode, therefore it is recommended to work with a professional with comprehensive knowledge of your car's security system to reduce the chance of damaging the car. Certain key programming tools can also be capable of analyzing diagnostic trouble codes from your vehicle, which can assist in fixing or resolving any further issues.