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Car Key Repair How to Fix a Dead Remote The car remotes are a great convenience for drivers They can unlock doors open trunks and even start the engine Remotes that work with these remotes may stop working at the most inconvenient instances If you discover that your key fob not working you can try a few simple fixes before going to the dealer These steps may save you money Keyless Entry System Theres no need to search for keys in your purse or pockets Just walk to your car press the button on the keyfob and the doors will be opened and the engine will begin Its a simple feature that makes driving a car more comfortable and safe The keyless entry system as any other device could be damaged through repeated use or other elements If you are having issues with your system you can either visit the dealer or call a locksmith Keyless entry systems operate by sending radio signals and then looking for the response signal on a key fob If the system recognizes the signal the cars doors are unlocked and the onboard computer is activated Some systems have another transmitter located in the trunk of the car that opens when you move a foot under it Each key fob is given a unique digital identification code by the manufacturer The fob is programmed by a proprietary process called programming This usually involves turning on the ignition of the car multiple times in a particular sequence and could also involve pushing or pulling various levers and buttons or taking out fuses Once a key fob has been programmed into your cars keyless system it transmits a digital identity code and a function code that tell the car what to lock or unlock the trunk The cars receiver confirms the identity of the transmitter through an authentication and encryption process The computer on board will allow the vehicle to be opened and start the engine if it is authorized A skilled criminal could snoop and use the code sent between the keyfob and the vehicle This would require a special device to record the transmission then retransmit it when the system isnt expecting it To combat this issue the majority of keyless entry systems use a method called rolling code that guarantees that each new transmitter signal received by the vehicle has a different counter than the previous one Batteries The most frequent cause of the car remote key fob not working is a dead battery Its a simple and inexpensive fix when you have a spare key fob on hand to replace the old one with The majority of fobs are powered by watchstyle batteries that can be bought at bigbox stores or hardware stores for less than 10 A quick search of the internet or in your vehicles owners manual will provide directions on how to take apart the fob that you have been using and replace the battery Be careful not to damage any antennas or circuits in the case after you have removed the battery If you mess with them the key fob will be unprogrammable and wont function If you need to move key fobs be careful Certain key fobs might have fasteners which can easily open and scatter key fob pieces all over your living space The majority of key fobs have one hole that can be used with a screwdriver or other pry tool to pop open the case However its best to wedge your pry tool around the outside of the case first like you would peeling an apple or orange Dont apply too much pressure as the case of the fob is usually constructed of plastic and could break or crack if apply too much pressure to it Make sure you match the size and type of the battery to your key fob when you replace it Certain fobs require two batteries whereas others have just one Using the wrong battery can quickly make your remote key fob ineffective If the problem persists then you can try it again using your key fob after installing the new battery If not youll need to determine whether your key fob is suffering from an issue that is more complex and requires a professional diagnosis and repair If this is the case you could require it to be changed by a dealer or buy a replacement key fob completely key fob repairs on your key fob are small and are filled with delicate electronics Its not surprising that theyll occasionally fail If the button on your cars ignition suddenly stops working you can generally fix it yourself The most common reason a car remote key stops working is because dirt or crud have trapped between the button To remedy this take out the batteries with care and clean each button using the help of a cotton swab which has been dipped into ruby alcohol Be sure to dry them thoroughly prior to reinstalling the batteries Its possible that your key fob is damaged in some way such as being dropped on concrete or accidentally scratched If this is the scenario you can test your key fobs functionality by using a different one The door lock sensor might have been unable to function in your vehicle This is a tiny metal part thats connected to the door lock button on your key fob and its not unusual for the sensor to break following prolonged use or exposure to weather conditions Press your key button several times without locking or unlocking your doors This resets the sensor If nothing else works you can always test the functionality of a spare key by opening and locking your doors using it If the spare key does not work you may have to contact a locksmith on call 24 hours a day who provides repair of car keys to make your remote work again If your cars key fob does work and its still not locking or unlocking your vehicle you may try to reprogramme your computer system Be aware that if youve used the same key fob for a period of time its likely to need to be programmed each few months to ensure that it is working properly with your vehicle Its not the ideal situation but its better than having to replace your remote completely