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Car Key Repair – How to Fix a Dead Remote Car remotes are a great convenience for drivers. They allow you to unlock doors, gain access to trunks and even start the engine. But, these remotes sometimes stop working at odd times. Before you visit the dealer, try some quick solutions in case your key fob isn't functioning. These steps may save you money. Keyless Entry System You don't have to look for keys in your pockets or purse. Simply walk up to your car, push the button on the keyfob and the doors will unlock and the engine will get started. car key repair cost 's a simple function that makes driving a car more comfortable and secure. However, just like any other device, the keyless entry system may fail due to repeated use or due to other reasons. If you're having problems with yours, you may either visit the dealer or phone an locksmith. The way a keyless entry system operates is by sending radio signals and then searching for a corresponding response from the key fob. If the system recognizes the signal, it will trigger to open the doors of the vehicle and activate the computer onboard. Certain systems have an additional receiver in the trunk of the car that opens automatically when you waggle your foot underneath it. Each key fob is assigned a unique digital identification code by the manufacturer. The fob is programmed by an exclusive process known as “programming”. This involves turning on the ignition of the car several times in a specific sequence, and could require pushing or pulling buttons or levers, or removing the fuse. Once a key fob has been programmed into your car's keyless system, it transmits a digital identification code and a function code that tell the car what to (lock the trunk, unlock it or open the trunk). The receiver on the car checks the authenticity of the transmitter by an authentication and encryption process. If it's authorized, the computer on board unlocks the vehicle and begins the engine. There are fears 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 later when the system doesn't expect it to. To prevent this from happening, most keyless entry systems rely on rolling code that ensures that every new signal from the transmitter received by the vehicle has a different counter value than the previous one. Batteries A dead battery is the most frequent reason for car remotes not to work. It's an easy and cheap fix in the event that you have a spare key fob on in your possession to replace the previous one with. Fortunately, the majority of fobs have traditional watch-style batteries which are available in hardware stores or big-box retailers for as little as $10. You can find directions to disassemble your key fob by searching the internet or in your car's manual. After you've removed your battery, be careful not to disturb any circuits or antennas inside the case. If you do this, the key fob will become unprogrammable and will not function. If you have to move them, do it with care as some key fobs have fasteners that easily pop open and scatter key fob pieces all over your living room. The case of a majority of key fobs has one screwdriver hole. To open it, you'll need to use a tool to pry it open. But, to start by putting the tool along the outside edge of the case, just as you would peel an orange or apple. Be careful not to apply too much pressure, since the case of the key fob is typically constructed of plastic and could break or crack if you apply too much pressure to it. Make sure you match the size and style of battery to your key fob when you replace it. Some key fobs come with two batteries, while others only need one. A bad battery could render your remote keyfob useless. If the issue persists, you can try again using your key fob after installing the new battery. If not it, you'll have to determine whether your device has an issue that's more complex that requires a professional diagnosis and repair. If this is the case, you might need to have it reprogrammed by a dealer, or you may need to purchase a new key fob altogether. Buttons The buttons on your key fob may appear small, but they are packed with electronics. It's not surprising that they'll malfunction from time to time. The good thing is, when your car's key button stops functioning, there's usually something you can do to fix it yourself. The most frequent reason why a car remote key stops functioning is due to dirt or crud has been stuck between the buttons. To get rid of this remove the batteries and clean each button with a cotton swab coated with ruby alcohol. Make sure to dry them thoroughly prior to installing the batteries. It's possible that the key fob has been damaged in some way, possibly dropped on concrete or accidentally damaged by something sharp. If this is the case, using a different key fob to test its functionality might reveal that it has simply been damaged and needs to be replaced. The door lock sensor could have stopped working in your vehicle. This sensor is a small metal part that is attached to the key fob's door lock button. It is not unusual for it to break due to weather conditions or long usage. To reset the sensor simply press your key button a few times without locking or unlocking your doors to reset it. If nothing else works, you can always test the function of a spare key by unlocking and locking your doors using it. If the spare key does not work, you may need to contact a locksmith on call 24 hours a day who can repair your car keys to make your remote work again. You can reprogram your computer if the car key button works but does not lock or unlock the vehicle. If you've used the same key fob for a time, it may require reprogramming every few months in order to continue to work with your vehicle. It's not ideal, but it is better than buying another remote.