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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 But these remotes sometimes stop working at odd times Before you visit the dealer consider some quick fixes in case your key fob isnt working These steps may save you money Keyless Entry System Instead of fumbling around with keys in your pocket or purse you can simply walk up to your car press a button on the key fob and then unlock the doors and start the engine Its a simple function that makes driving a car more enjoyable and safe But like all devices its possible that the keyless entry system may fail due to repeated use or due to other factors If youve had issues with yours there are two options Go to the dealership or call the local locksmith The way that a keyless entry system operates is by sending out radio signals and then searching for a corresponding response from the key fob If the system detects the signal the vehicles doors are unlocked and the onboard computer activated Certain systems have another transmitter located in the trunk of the car which opens when you move a foot under it Each key fob is equipped with a unique digital identification code that is issued by the manufacturer A unique process of technology known as programming is used to make sure that the fob is set up with the cars specific system This usually involves turning on the cars ignition repeatedly in a specific sequence It could also require pulling or pushing various buttons and levers or removing fuses Once the key fob has been programmed into the keyless system of your car it transmits a digital identity code and a function code that tell the car what to lock or unlock the trunk The receiver on the car confirms the identity of the transmitter through an authentication and encryption process The onboard computer will allow the vehicle to be opened and start the engine if its authorized A clever criminal could intercept and then use the code that is transmitted 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 help combat this most keyless entry systems use the rolling code method that guarantees that each new transmitter signal received by the vehicle has a different counter value than the previous one Batteries A dead battery is the main reason for the car remote to not function If you have an extra key fob its a lowcost and simple fix The majority of fobs are powered by watchesstyle batteries which can be purchased at bigbox stores or hardware stores for less than 10 You can find directions to disassemble your key fob by searching the internet or in your vehicles manual After youve removed the battery be careful not to disturb any circuits or antennas inside the case Theyre likely to be holding the key fobs program to your cars specific model and messing with them will make it unprogrammable and most likely not work If you have to move the key fobs take care Certain key fobs could have fasteners that can easily open and scatter key fob pieces all over your living space The majority of key fobs have a single hole for the screwdriver or another pry tool to pop open the case However its a good idea to use your tool to wedge it around the outside of the case first as if you were peeling an orange or apple Be careful not to apply too much pressure as the case of the fob is usually made of plastic and can break or crack if apply too much force to it When youre ready to replace the battery be sure to match the size and style to your key fob Some key fobs require two batteries whereas others have just one Using the incorrect battery could make your remote key fob useless If the issue continues you can try again using your fobs key after installing the new battery If this doesnt work then youll be required to determine if your fob is experiencing something more complicated that requires a specialist diagnosis You may have to have your key fob reset at a dealer or buy a new one Buttons The buttons on your key fob are pretty small and are packed with delicate electronic components So its not too surprising that theyre destined to fail from time to time The good thing is in the event that your cars keypad stops functioning theres usually something you can do to fix it yourself The most common reason a car remote key stops working is because dirt or crud have lodged between the button To remedy this take out the batteries in a careful manner and scrub each button with an abrasive that is dipped in ruby alcohol Make sure you dry them completely before reinstalling batteries Its also possible that the key fob was damaged somehow perhaps dropped on concrete or unintentionally scratched by something sharp If this is the case you can test the function of your key fob using another one Another possibility is that the door lock sensor in your vehicle isnt working anymore Its a tiny metal part thats connected to the door lock button on your key fob and its not unusual for the sensor to break after long usage or exposure to harsh weather conditions To reset the sensor just press your key fob a few times without locking or unlocking your doors to reset it If vehicle key repairs works you can test the capabilities of a spare key by opening and locking your doors using it If the spare key doesnt work you may need to contact a 24hour locksmith who provides repair of car keys to make your remote work again If your car key button is working but its still not locking or unlocking your vehicle you may try to reprogramme your computer system Be aware that if youve had the same key fob for a period of time its going to need to be programmed every couple of months to ensure it continues to work properly with your vehicle Its not the most ideal solution but its better than buying another remote