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Car Key Repair – How to Fix a Dead Remote Car remotes are a great convenience to drivers. They can unlock doors, access trunks, and even start the engine. But, these remotes sometimes stop working at inconvenient times. If you discover that your key fob no longer working, try a few fixes before going to the dealer. These steps may save you money. Keyless Entry System You don't have to look for keys in your pockets or purse. Just walk up to your vehicle, press the button on the keyfob and the doors will be opened and the engine will get started. It's a simple function that makes driving a car more enjoyable and secure. The keyless entry system, as any other device, can be damaged by repeated use or by other causes. If you've had issues with yours, there are two options: Visit the dealership or call a local locksmith. A keyless entry system operates by sending radio signals and then looking for a response signal from a key fob. If the system can recognize the signal, it will trigger to unlock the car doors and activate the onboard computer. Certain systems have another transmitter located in the trunk of the car that opens it when you waggle one foot underneath it. Each key fob is given a unique digital identification code by the manufacturer. car key remote repair is programmed using a unique process called “programming”. This usually involves turning on the ignition of the car multiple times in a particular 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 identification code and a function code to instruct the car on what to do (lock, unlock or open the trunk). The car's receiver verifies the transmitter's identity through an authentication and encryption process. The onboard computer will allow the vehicle to be opened and start the engine if it is authorized. There are concerns that a skilled criminal could intercept the code that's transmitted between the key fob and the car. This requires a special device that records the transmission, and then retransmits it when the system doesn't anticipate it to. Most keyless entry systems use the rolling code method to stop this. This ensures that every new transmitter signal received by a car has a counter value that is different from the previous one. Batteries The most common cause of car remotes key fobs not working is the battery is dead. It's an easy and cheap fix when you have another key fob at your desk to replace the old one with. Luckily, most fobs use standard watch-style batteries that can be purchased at hardware stores or big-box retailers for as little as $10. A quick search of the internet or your car's owner's manual should give you instructions on how to disassemble the fob that you have been using and swap out the battery. Be careful not to damage any antennas or circuits in the case once you've removed your battery. They're likely to hold the key fob's program to your specific car and tampering with them will render it impossible to program (and most likely not work). If you must move the key fobs, take care. Certain key fobs might have fasteners that can easily be removed and scatter key fob pieces across your living space. Most key fobs come with a single hole for an screwdriver or similar tool to open the case, however it's a good idea to put your tool on the outside of the case first, like you would peeling an apple or orange. Be careful not to apply too much pressure, since the fob case is often made of plastic and may break or crack if apply too much pressure to it. When you're ready to replace the battery, make sure to match its size and type to your key fob. Some key fobs have two batteries while others require one. A bad battery could cause your remote to become useless. If the problem persists, you can try again using your key fob after installing the new battery. If it doesn't work, you will need to determine whether your fob is experiencing an issue that is more complicated and requires professional diagnosis. You may have to have the fob reprogrammed by the dealer or purchase a new one. Buttons The little buttons on your key fob are pretty small, and they're packed with delicate electronic components. It's not a surprise that they're likely to fail from time time. The good news is, when your car's key button fails to function, there's typically something you can do to fix it yourself. One of the most frequent reasons that a car key remote doesn't work is that dirt or crud has accumulated between the buttons. To fix this, remove the batteries in a careful manner and clean each button using an abrasive that is dipped in ruby alcohol. Be sure to dry the buttons completely before reinstalling them. It's possible that your key fob is damaged in any way, for example, being dropped on concrete or accidentally scratched. If that's the case, using another key fob to test its functionality could reveal that the one you have been damaged and requires to be replaced. Another possibility is that the door sensor for your car's lock has stopped working. It's a tiny metal part that's connected to the door lock button on your key fob, and it's not unusual for the sensor to break during prolonged usage or exposure to harsh weather conditions. To reactivate the sensor simply press your key fob a few times without locking or unlocking your doors to reset it. If all else fails, you can always test the operation of an extra key by trying to unlock and lock your doors with 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 car key button is working but still not locking or unlocking the vehicle, try to re-programme your computer system. But keep in mind that if you've had the same key fob for a period of time, it's likely to need to be programmed each few months to ensure it is working properly with your vehicle. It's not ideal, but it is better than having to buy a new remote.