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How to Fix a Key Fob That isn't WorkingIf your key fob won't work and you're not sure why, you can fix it by following a few simple steps. The first step is to be sure that it's not the backup remote.If remote key fob repair can unlock and lock the doors of your car, it is most likely that the primary remote isn't functioning. The most common causes for car remote key failure are circuitry or battery issues.BatteryThe battery in the key fob may get worn out over the course of time. It is easy to replace a battery. However it is crucial to select the right kind. You can consult your owner's guide or contact the manufacturer to determine the right kind. It is also important to examine the battery compartment as dead batteries can leak caustic chemicals which can damage the remote. If replacing the battery does not fix the issue there could be other issues that require professional attention. For instance, if buttons seem stuck or damaged, it may be necessary to take the remote apart and rework its components. You can also try reprogramming the vehicle to recognize the new fob.ButtonsKey fobs can become dirty and worn-out from frequent use. It is not unusual for buttons to stop functioning, or require a hefty push to make them work. This can be very frustrating, especially if you are away from home and need to start your car. Fortunately, even worn-out or damaged buttons can be fixed with just a bit of time and some of the materials you have in the home.First, ensure that the batteries are charged correctly and that the indentation on the back of the button is filled. Then, carefully open the remote and examine the circuit board. Examine for signs of rust or other indications that buttons are worn out or damaged, like missing conductive paint. Use the Q-tip, dipped in alcohol, gently clean any membrane contacts that have become worn or have conductive paint missing. Don't rub too hard, as this could erode the conductive paint, and block the button from firing when you press it.Also, be sure to check the battery connector's terminals to ensure any loose solder connections. Soldering them back into place will restore the button's functionality If this is the case. The same procedure can be used to restore functionality to any other loose connections within the fob.In the end, if any of the buttons made of rubber on the front of the key fob have stopped working or require a very hard press to work, it is likely that the graphite disks at the back of the button are deteriorating and require replacement. You can usually do this by rubbing a pencil over the disks. This should bring the button to life.If none of these solutions work, or if you still not be able to get the button respond when pressed hard, it could be that the circuitry has failed. It is possible to fix this issue by cleaning and re-soldering your fob however, you should have an extra in case it doesn't work.CircuitryWhether or not the keys fob buttons are functioning the circuit board that is inside your remote may be dirty. A thorough examination is often enough to resolve this problem. Water and broken cases are the most common causes of boards that are dirty. A broken case can allow water and other debris into the circuit board, which can cause it to short out. Water can also get through pins and vias, which are tiny connectors on the board.If you're handy enough to remove your key fob and aren't afraid of a little mess, we can de-solder the buttons and then solder new ones in their place. Also, it's worth checking the connections between the battery terminals. If they are loose, the buttons may not work or even become stuck in their down position. Soldering the terminals back into place is usually enough to return a malfunctioning fob back to working.Non-Remote Transponder ChipsSealed non-remote transponder chips are more durable than the remote fobs that have them but they can be broken by a hole being made in them or pushed over by a lawnmowers or car door handle. Fuse failures are usually to blame for non-remote chips failures.If you're not comfortable opening the key fob, you may remove the circuitboard and use a multimeter to check that the diode is functioning properly. If you're not comfortable doing this, go to your local hardware store or Oreilly's, and they usually have an RFID frequency tester that can tell you whether the key fob is transmitting a signal.ProgrammingKey fobs take lots of abuse and aren't impervious to damage. They can lose their pairing with the receiver inside your vehicle because of shocks or a low battery, which calls for changing the program. A professional auto locksmith or dealer can reprogram your key fob and get it working again. If, in the unlikely event that resetting or repairing your key fob isn't working it may be time to replace it all over again.