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How to Fix a Key Fob That isn't Working If your key fob isn't working A few easy steps can fix it. First, check to make sure it's not the backup remote. If your backup remote is unable to lock and unlock the doors of your car, then it is most likely that the primary remote isn't functioning. Most car remote key failures result from circuitry or battery problems. Battery The battery in a key fob can wear out over time. It is relatively easy to replace the battery, however it is crucial to ensure that you select the correct one that you can refer to the owner's manual or talk to the dealer of the manufacturer to find out the kind of battery you need. It is also a good idea to inspect the battery compartment carefully because dead batteries can leak harmful chemicals that can harm the remote. If replacing the battery does not fix the issue, there may be other issues requiring professional attention. For instance, if the buttons seem to be stuck or damaged It may be necessary to take the remote apart and rework its components. It is also possible to reprogramme the vehicle to recognize the new device. Buttons Key fobs can get dirty and worn out from frequent use. This is not uncommon, but it can cause buttons to stop working or require a hard press for them to function. This can be a hassle, especially when you are away from your home and you need to turn on your car. Even worn-out or malfunctioning buttons are often fixable with a little time and tools you already have at home. First, check that the batteries are properly installed and that the indentation at the back of the button has been filled. Then, carefully remove the remote and look at the circuit board. Examine for indications of rust or other signs the buttons have been damaged or worn. For example, conductive paint may be missing. Use a Q-tip that has been dipped in rubbing alcohol to gently clean any membrane contact that is worn-out or has conductive paint missing. Avoid rubbing too hard since this could cause damage to the conductive paint and block the button from firing when it is the button is pressed. Also, carefully check the battery connector's terminals for an unattached solder connection. Soldering them back in place will restore the button's functionality in the event that this is the situation. The same procedure can be used to restore function to any loose connections within the fob. In the end, if any of the rubber buttons 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 on the back of the button are wearing out and require replacement. You can do this by rubbing a pen 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 you press it hard, it could be that the circuitry has failed. It is possible to fix this issue by cleaning and re-soldering your fob, but you should have a spare in case it doesn't work. Circuitry The circuit board of your remote control could be dirty regardless of whether the buttons on the key fob work or not. A thorough examination is usually enough to fix this issue. key fob repair of dirty circuit boards are water and damaged cases. A damaged case can allow water and other debris to enter and short circuit the electronic components. Water can also eat through pins and vias, which are tiny connectors found on the board. If you are handy enough to open your key fob and you don't mind making some mess, we can remove the buttons from their sockets and solder in new ones. It's also worth examining the battery terminal connections. They can become very dirty and if they're loose, the buttons may not work or may even remain in their down position. Soldering the terminals and button's back in place is usually all that's required to return keys that are not in working order. Non-Remote Transponder Chips The sealed non-remote chips are more durable than remote fobs, but they can be cracked if a hole is drilled in them, or in the event that a door handle of a car or lawnmowers is pushed over them. Fuse failures are usually the cause of non-remote chip failures. If you are not comfortable opening the key fob, remove the circuitboard and use a multimeter to verify that the diode is functioning properly. If you're not confident doing this, visit your local hardware store or the Oreilly's and they'll usually have an RF frequency tester that will determine whether the key fob sending signals. Programming Key fobs aren't impervious to destruction and can be damaged through a variety of causes. They may lose their connection to the receiver in your car because of shock or a low battery, which calls for them to be reprogrammed. A professional auto locksmith, or the main dealer can reprogram the keyfob and get it working again. In the event that resetting and repairing your key fob doesn't work, it could be time to replace it entirely.