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How to Fix a Key Fob That isn't Working If your key fob isn't working There are a few simple steps that can be taken to fix it. The first step is to make sure it's not the backup remote. If the backup is able to lock and unlock your car doors it is most likely an issue with the primary remote. Most car remote key failures are caused by circuitry or battery problems. Battery The battery inside a key fob can get worn out over the course of time. It is easy to replace the battery. However, it is important that you choose the right type. You can consult your owner's manual or call the manufacturer to inquire about the right kind. It is recommended to examine the battery compartment with care because dead batteries can leak harmful chemicals that can harm the remote. If changing the batteries doesn't solve the issue it could be because there are other issues that require attention by a professional. If the buttons are damaged or stuck, for example it could be necessary to remove the remote and rebuild each component. You can also try reprogramming your vehicle to recognize the new key fob. Buttons Due to frequent use, key fobs may wear out and become dirty. This is not atypical however, it can cause buttons to cease working or require a hard press for them to function. This can be extremely frustrating, especially if you are out of town and need to start your vehicle. Even worn-out or malfunctioning buttons are often fixable with a little time and materials you already have at home. First, make sure that the batteries are correctly placed and that the indentation at the back of the button is filled. Then, carefully open up the remote and inspect the circuit board. Examine for signs of rust or other signs that buttons are worn out or damaged, like missing the conductive paint. Then, using a Q-tip that has been dipped in rubbing alcohol, gently clean any membrane contacts that are worn or where conductive paint is missing. Be careful not to rub too hard, because this could damage the conductive paint and block the button from firing when it is the button is pressed. Check the battery connector's terminals for loose solder connections. If car key repair service is the case, simply connecting them back can restore function to the button. You can apply the same process to restore functionality to any other loose connection within the fob. If any of the rubber buttons located at the front of the keyfob isn't functioning or require to be pressed extremely hard the graphite disks on the back of the button may have worn out and need to replaced. You can do this by rubbing a pen over the disks. This should bring the button back to life. If none of this is helpful or if the button still does not respond to a hard press It could be that the circuit board itself has gone bad. This can sometimes be repaired with a quick clean and refitting, but it's recommended to have an additional fob available in the event this method fails for you. Circuitry The circuit board inside your remote control may be dirty, regardless of whether the buttons on the key fob function or not. This problem can be resolved through a thorough examination. Water and broken cases are the most common causes of boards that are dirty. A damaged case allows water and other debris to pass through and short circuit the electronic components. Water can also get through pins and vias, which are small connectors found on the board. If you're able to open up your key fob and aren't afraid of some mess, we can de-solder the buttons and solder new ones in their place. It's also worth checking the connections between the battery terminals. If they're loose, the buttons might not function properly or become stuck in their down position. Soldering terminals and buttons back to their proper positions is usually enough to return a malfunctioning fob back to working. Non-Remote transponder chips Sealed non-remote transponder chips are more durable than the remote fobs that have them but they can be broken by a hole being drilled into them or run over by a lawnmowers blade or car door handle. The majority of non-remote transponder chip malfunctions can be blamed on an exploded fuse. If you're handy enough to open up the sealed key fob and are able to bear the mess, you can take off the circuit board and test the fuse using a multimeter to ensure that it is functioning as intended. function. If you're not confident doing this, head to your local hardware store or the Oreilly's and they'll usually have a RF frequency tester that will determine whether the key fob transmitting a signal. Programming Key fobs take many abuses and aren't impervious to damage. They may lose their connection to the receiver in your car because of shock or a low battery, which calls for the reprogramming. A professional auto locksmith or a main dealer can reprogram your key fob to get it back up and running. In the rarer case that resetting and fixing your key fob doesn't work it could be the time to replace it all over again.