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How to Fix a Key Fob That isnt Working If your key fob does not work you can fix it by following just a few steps The first step is to be sure its not the backup remote If your backup remote cannot lock and unlock the doors of your car it is most likely that the primary remote is not working The most frequent causes of key problems with your car remote are circuitry or battery issues Battery The battery in the key fob may get worn out over the course of time It is quite simple to change out a battery although it is essential to ensure that you use the right type and you can consult your owners manual or contact the dealer of the manufacturer to find out the kind of battery you need It is also essential to check the battery compartment since batteries that are not working properly can release caustic chemicals that can harm the remote If changing the battery doesnt fix the problem there could be other issues requiring professional attention For example if buttons seem to be stuck or damaged it may be necessary to take the remote apart and rebuild its components You can also try reprogramming your car to recognize the new key fob Buttons Due to frequent use key fobs may wear out and become dirty It is not uncommon for buttons to stop functioning or require a hard push to make them work This can be a huge hassle especially if youre out of town and need to start your car Even malfunctioning or wornout buttons are often fixable with a little time and materials you already have at home First make sure that the batteries are correctly inserted and that the indentation at the back of the button has been filled Open the remote carefully and look over the circuit board Look for indications of rust or other indications that the buttons are worn or damaged For instance there could be conductive paint missing Use a Qtip that has been dipped in rubbing alcohol to gently clean any membrane contact that is damaged or where conductive painting is missing Dont rub too hard as this could erode the conductive paint and block the button from firing when it is pressed Examine the battery connectors terminals for loose solder connections Soldering them back into place will allow the button to function again in the event that this is the case You can use the same procedure to restore functionality to any other loose connection within the fob Finally if any of the buttons made of rubber on the front of the key fob stop working or require a very difficult press to function it is likely that the graphite disks that are on the back of the button are wearing out and need to be replaced It is usually done by rubbing a pen over the disks This should bring the button back to life If none of this is useful or if the button doesnt respond to a hard press then it may be the case that the circuit board itself has gone bad It is possible to fix the issue by cleaning and resoldering the fob however you should have an extra in case it doesnt work Circuitry The circuit board in your remote control could be dirty regardless of whether the buttons on the key fob are working or not The issue can be solved through a thorough examination The most frequent causes of dirty circuit boards is water and damaged cases A damaged case allows water and other debris to get in and short circuit the electronic components Water can also eat away at pins and connectors on the board which are known as vias If youre able to remove your key fob and dont mind making a mess we can desolder the buttons and put new ones in their place Its also worth looking at the battery terminal connections If theyre loose the buttons could not work or even become stuck in their down position Soldering terminals and buttons back to their proper positions is usually enough to return a malfunctioning fob to working NonRemote transponder chips The nonremote chips that are sealed are more durable than remote fobs however they can be cracked when a hole is made in them or in the event that a door handle of a car or lawnmower runs over them lock key repair near me of the time nonremote transponder chip malfunctions can be blamed on a blown fuse If youre able to open up the sealed key fob and can tolerate the mess you can easily remove the circuit board and test the fuse with a multimeter for proper diode function If youre not comfortable with this visit your local Oreilly or hardware store and use their RF frequency tester This will inform you whether the key fob sends an RF signal Programming Key fobs endure many abuses and arent completely indestructible They may lose their connection to the receiver in your car because of shock or a low battery requiring them to be reprogrammed A professional auto locksmith or a main dealer will be able to reprogram your key fob and get it functioning again If in the unlikely event that resetting or repairing your key fob fails it may be time to replace it all over again