How to Fix a Key Fob That isn't Working
If your key fob does not work, you can fix it with some simple steps. First, check to make sure it's not the backup remote.
If your backup remote can lock and unlock the doors of your car, then it is most likely that the primary remote is not working. The most common causes of key problems with your car remote are issues with the circuitry or battery.
repair car key inside the key fob may be worn out over time. It is simple to replace batteries. However, it is important that you use the correct type. You can check your owner's manual or call the manufacturer to determine the right type. It is recommended to examine the battery compartment carefully because dead batteries can release caustic chemicals that could harm the remote. If replacing the batteries doesn't solve the problem it could be because there are other issues that require professional attention. If the buttons are stuck or broken, for example, it may be necessary take the remote apart and rework each component. You could also try reprogramming your car to recognize the new key fob.
Buttons
Key fobs can become dirty and worn-out from frequent use. It is not unusual for buttons to cease functioning, or require a long press to make them work. This can be a hassle especially when you're away from your home and need to turn on your car. Even worn-out or malfunctioning buttons can be fixed with a little time and tools you already have at home.
First, verify that the batteries have been correctly installed and that the indentation on the back of the button has been filled. Then, carefully open up the remote and look at the circuit board. Examine for signs of rust or other indications that buttons are worn out or damaged, such as missing conductive paint. Use a Q-tip that has been dipped in rubbing alcohol to gently clean any membrane contact that has worn-out or where conductive paint is missing. Avoid rubbing too hard, because this could damage the conductive paint and block the button from firing when the button is pressed.
Check the battery connector's terminals carefully for any loose solder connections. Soldering them back into place can restore the button's functionality in the event that this is the situation. The same process can be used to restore function to any loose connections inside the fob.
Finally, if any of the buttons made of rubber on the front of the key fob aren't working or require a very difficult press to function, it is likely that the graphite disks that are on the back of the button are wearing out and need to be replaced. It is usually done by rubbing a pen over the disks. This should bring the button to life.
If none of this is useful, or if the button still doesn't respond to a firm press It could be the case that the circuit board has become damaged. This can sometimes be repaired by a quick clean, and replacing the solder, but it is best to have an extra fob in case this method does not work for you.
key car repair
Whether or not the key fob buttons function the circuit board that is inside your remote may be dirty. The issue can be solved through a thorough examination. Broken and damaged cases are the most frequent causes of dirty boards. A damaged case could let water and other debris to enter the circuit board, causing it to short. Water can also eat away at pins and connectors that are small on the board, which are known as via's.
If you are handy enough to open your key fob, and aren't afraid of making a mess, we can remove the buttons from their sockets and solder in new ones. Also, you should check the connections between the battery terminals. They can get very dirty and if they're loose, the buttons might not work or even stay in their down position. Soldering the terminals, and putting the button back in their place is generally all that's required to return keys that are not in working condition.
Non-Remote Transponder Chips
The non-remote chips that are sealed are more durable than their remote fobs, but they are susceptible to breaking if a hole is drilled into them or if a car door handle or lawnmower runs over them. Most of the time non-remote transponder chip malfunctions can be blamed on an exploded fuse.
If you're handy enough to remove a sealed non-remote key fob and can tolerate the mess, you can remove the circuit board and test the fuse using a multimeter for proper diode function. If you're not comfortable doing this, visit your local hardware store or the Oreilly's and they usually have an RF frequency tester that will let you know whether the key fob is sending a signal.
Programming
Key fobs aren't impervious to destruction and are susceptible to being damaged by a lot of things. They may lose their connection with the receiver inside your vehicle due to shocks or low battery, which calls for changing the program. A professional auto locksmith or main dealer can reprogram your key fob to get it functioning again. In the rarer case that resetting and repairing your key fob isn't working it may be time to replace it entirely.