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How to Repair a Remote Key Although many remote key fobs have impressive battery life, they do eventually get worn out. Sometimes it's as easy as changing the batteries, but occasionally there are more serious issues. A quick fix that can aid is to disassemble the remote and cleaning the buttons before flexing them in and out. These techniques may be all you need to get your key fob working properly. Battery Car key remotes are powered by CR2025 or CR2032 batteries, and they can often be replaced when the fob is functioning. If it isn't, you can open the fob and check the buttons and battery terminals for any indication of looseness or damaged parts. Most of the time, the buttons and terminals can be re-soldered back into place, but you'll need to be aware of the kind of battery the fob is using. If key fob repairs isn't the problem, try using a backup key fob and see whether you are able to unlock or start your car using it. If you can, then it's time for a replacement of the primary fob. If it's not, a professional inspection is needed to figure out why it's not working properly. It could be as simple as reprogramming, or it could require other types of repairs. You may also find that your car has lost the fob. This isn't something you can do on your own. Case Study The case of a remote key is the plastic housing that covers the outside and typically comes with the button pad replacement. It is recommended to purchase the latest case as the original is likely to be very dirty. It is essential that the circuit board within the case is placed correctly. The circuit board is what determines the function of the key fob. You 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. Examine the contact points of the buttons on the keypad. They may be loose over time or have been damaged. Soldering them back to their original position will often allow them to return to their original function, in the event that they snap completely. Buttons If the buttons on your key fob do not function anymore or are difficult to press you may need a dorman or motormite remote key housing replacement could be purchased online for a reasonable price for the year/make/model you have. Then, you can take the circuit board out of your old case and insert it into the new one. You may need to alter the position of the board on some models. The black contact points of the buttons can be bonded to using aluminum foil and double-sided tape. Programming The key fob is connected with the receiver inside your vehicle and this connection can become corrupted. A professional will inspect your vehicle to determine the year, make, and model. They will then employ specialist equipment to recouple or program an unmodified transponder chip or fob (or clone the key, if possible). They will then test the remote to make sure that it functions. When programming blank keys, it is important to be careful. The process can be complex and each manufacturer has distinct instructions. It is easy to miss a key step or to take too long before exiting the programming mode. To avoid the risk of damaging your vehicle, it is best to work with an expert with vast knowledge of the security system in your vehicle. Certain key programming tools can also identify diagnostic trouble codes in your vehicle. This can assist you to repair or troubleshoot other issues.