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Car Key Repair – How to Fix a Dead Remote Car remotes are a wonderful convenience for drivers. They can unlock doors, open trunks, and even start the car. But, these remotes sometimes stop working at odd times. Before you visit the dealer, you can try a few quick fixes when your key fob stops working. These tips could save you money. Keyless Entry System You don't 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 start. It's an easy feature that makes driving a car more relaxing and safe. However, just like any other device, the keyless entry system could fail due to repeated use or because of other reasons. If you have problems with your system, you can either visit the dealer or call an locksmith. The way that a keyless entry system operates is by sending out radio signals, and then searching for a corresponding response signal from the key fob. If the system recognizes the signal, the car's doors are unlocked and the onboard computer is activated. Some systems include a second receiver on the car's trunk that will open automatically when you waggle your foot on it. Each key fob is equipped with an individual digital identification code, which is given by the manufacturer. A specific process of technology called “programming” is used to set the fob up with the car's specific system. automotive key repair involves turning on the ignition of the car several times in a certain sequence, and could include pulling or pushing various buttons and levers or the removal of fuse. When a key fob is programmed to your vehicle's keyless entry system it transmits the digital identity code as well as a function code that tells the car what to do (lock or unlock the trunk, or open the trunk). The receiver in the car verifies that the transmitter is the person it claims to be by using an authentication and encryption procedure. The onboard computer will allow the vehicle to be opened and start the engine if it's authorized. There are fears that a clever criminal could intercept the code that's transmitted between the key fob and the car. This requires a device that records the transmission and then retransmits it later when the system doesn't expect it. The majority of keyless entry systems employ the rolling code method to stop this. This ensures that each new transmitter signal received by a vehicle has a counter value that is different from the previous one. Batteries A dead battery is the most common reason for car remotes not to function. It's a cheap and easy fix if you have an extra key fob on hand to replace the old one with. Most fobs are powered with watch-style batteries, which can be purchased at big-box stores or hardware stores for less than $10. You can find directions to disassemble the key fob on the internet or in your vehicle's manual. After you've removed the battery, be careful not to disrupt any of the circuits or antennas in the case. They are likely holding the key fob's program to your specific car, and messing with them will make it unprogrammable (and likely to fail). If you need to move key fobs, be careful. 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 one hole that can be used with an screwdriver or similar tool to open the case, however it's best to use your tool to wedge it around the outside of the case first, just as you would peeling an apple or orange. Do not apply too much pressure, as the fob case is often made of plastic and can break or crack if apply too excessive force to it. Make sure you match the size and style of battery to the key fob when replacing it. Some fobs require two batteries, whereas others only have one, and the incorrect battery could render your key fob remote useless. After the new battery has been put installed, test your key fob again to see if it solves your issue. If not, you'll 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 might need to have it reprogrammed by a dealer, or you may need to buy a replacement key fob completely. Buttons The little buttons on your key fob are pretty tiny, and filled with delicate electronics. It's not surprising that they will malfunction from time to time. If the car key button suddenly stops working, you'll be able to usually fix it yourself. One of the most common reasons why a car key remote doesn't work is because dirt or grit has become lodged between the buttons. To clear this up take care to remove both batteries and scrub each button using a cotton swab that has been that has been dipped in ruby alcohol. Be sure to dry them completely before installing the batteries. It's 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 the functionality of your key fob by using another one. Another possibility is that the door sensor for your car's lock isn't working anymore. The sensor is a tiny metal piece that is connected to the key fob's door lock button. It's not unusual for it to break due to weather conditions or extended use. Press your key button several times without locking or unlocking your doors. This will reset the sensor. If all else fails, you could always check the functioning of the spare key by attempting to open and close your doors using it. If the spare key doesn't work, it may be necessary to find a 24-hour locksmith that offers auto key repair to make your remote work again. You can reprogram your computer if the car key button is working, but it still cannot lock or unlock your vehicle. But keep in mind that if you've owned the same key fob for a long time, it's going to need to be programmed every few months to ensure that it is working properly with your vehicle. It's not ideal, but it is better than having to purchase another remote.