How to Fix a Key Fob That isn’t Working
If your key fob does not work then you can fix it with a few simple steps. The first step is to be sure that it’s not your backup remote.
If your backup remote is unable to unlock and lock the doors of your car, then it is likely that the main remote car key repair isn’t functioning. The most common causes of car remote key failure are issues with the circuitry or battery.
Battery
The battery in the key fob may get worn out over the course of time. It is easy to replace a battery. However it is essential that you choose the right kind. You can check your owner’s manual or call the manufacturer to find out the right type. It is recommended to examine the battery compartment thoroughly because dead batteries can release caustic chemicals that could harm the remote. If replacing the battery does not solve the issue, there may be other issues requiring professional attention. If the buttons are broken or stuck, for example it could be necessary to remove the remote and rebuild each component. You can also try reprogramming the vehicle to recognize the new device.
Buttons
Due to frequent use, key fobs can get dirty and worn. It is not uncommon for buttons to cease functioning, or require a hefty push to make them work. This can be frustrating, especially when you are 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, check that the batteries are up correctly and that the indentation on the back of the button is filled. Then, carefully remove the remote and examine the circuit board. Examine for indications of rust or other signs the buttons have been worn or damaged. For instance there could be conductive paint missing. Use a Q-tip dipped into rubbing alcohol to gently clean any membrane contact that is worn out or where conductive paint is missing. Avoid rubbing too hard, because this could damage the conductive painting and prevent the button from firing when the button is pressed.
Also, make sure to inspect the battery connector terminals for any loose solder connections. Soldering them back in place will restore the button’s functionality in the event that this is the situation. You can apply the same procedure to restore functionality to any other loose connection in the fob.
If, for instance, any of the buttons made of rubber on the front of the key fob stop working or require a very long press to function, it is likely that the graphite disks on the back of the button are deteriorating and require replacement. This can usually be done by rubbing a pencil over the disks, which will bring the button back to working.
If none of these solutions work, or if you still are unable to get the button to respond when pressed hard, it could be that the circuitry is failing. It is possible to fix this by cleaning and re-soldering your fob but you should also have another spare in case it does not work.
Circuitry
Whether or not the Key repair car fob buttons function the circuit board in the remote could be dirty. This issue can be fixed by a thorough inspection. Broken cases and water are the most frequent causes of dirty boards. A damaged case can allow water and other debris to pass through and short out the electronic components. Water can also destroy pins and small connectors on the board, referred to as via’s.
If you’re handy enough to remove your key fob and don’t mind some mess, we can take off the buttons and then solder new ones in their place. Also, you should check the connections between the battery terminals. If they’re loose, the buttons could not function or get stuck in their down position. Soldering the terminals, and putting the button back into place is typically all that’s required to return the key fob that is not working to working condition.
Non-Remote Transponder Chips
Sealed non-remote transponder chips are more durable than remote fobs they are contained in, but they can be cracked by a hole that is drilled into them or over by a lawnmower or car door handle. Most of the time, non-remote transponder chip malfunctions could be attributed to an exploded fuse.
If you’re handy enough to open a sealed non-remote key fob and can tolerate the mess, you can easily remove the circuit board and test the fuse with an instrument to verify diode function. If you’re not confident doing this, visit your local hardware store or Oreilly’s and they’ll usually have an radio frequency tester that can determine whether the key fob is transmitting a signal.
Programming
Key fobs are not indestructible and are susceptible to damage by a lot of things. They can lose their pairing to the receiver in your car because of shock or a low battery, which requires them to be reprogrammed. A professional auto locksmith or the main dealer can reprogram the keyfob to get it functioning again. If resetting or fixing your key fob fails it is possible to replace it.
