How to Fix a Key Fob That isn't Working
If your key fob does not work and you're not sure why, you can fix it by following some simple steps. First, ensure that it's not the backup remote.
If the backup remote is able to lock and unlock your car doors then there is likely an issue with the main remote. The most common causes of key problems with your car remote are issues with the circuitry or battery.
Battery
The battery inside the key fob could wear out over time. It is fairly easy to change out the battery, however it is essential to ensure you choose the correct type and you can consult the owner's manual or talk to the dealer for the manufacturer to determine the type of battery you require. It is also crucial to examine the battery compartment as dead batteries can leak toxic chemicals that could damage the remote. If replacing the battery does not solve the issue there could be other issues requiring professional attention. If buttons are broken or stuck, for example it could be necessary to take the remote apart and rework each component. You can also try reprogramming the vehicle to recognize the new device.
Buttons
Key fobs can get dirty and worn out from repeated use. This is not unusual, but it can cause buttons to cease working or require a long press to function. This can be a hassle, especially when you are away from home and have to switch on your car. Even malfunctioning or worn-out buttons can be fixed with a little effort and materials you already have at home.
First, check that the batteries have been correctly inserted and that the indentation at the back of the button has been filled. Take the remote apart and look over the circuit board. Examine for signs of rust or other signs that the buttons are worn out or damaged, like missing conductive paint. Then, using the Q-tip, dipped in rubbing alcohol, gently clean any membrane contacts that have become worn or where conductive paint is missing. Don't rub too hard in order to damage the conductive paint and prevent the button from firing when you press it.
Check the battery connector terminals carefully for any loose solder connections. Soldering them back in place will restore the button's functionality in the event that this is the case. The same process can be used to restore function to any other loose connections in the fob.
If any of the rubber buttons at the front of the keyfob are not working or require being pressing very hard the graphite disks at the back of the button might have worn out and need to replaced. This is usually done by rubbing a pencil on the disks, which should 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 you press it hard, it could be that the circuitry has failed. It is possible to fix this by cleaning and re-soldering the button but you should also have an extra in case it does not work.
Circuitry
The circuit board in the remote control could be dirty regardless of whether the buttons on the key fob work or not. A thorough examination will usually resolve this issue. The most frequent causes of dirty circuit boards is water and broken cases. A broken case allows water and other debris to enter and short out the electronic components. car key fob repairs near me can also damage pins and small connectors on the board, which are known as via's.
If you are handy enough to open your key fob and you don't mind making a mess, we can take the buttons out of their sockets and then solder new ones. Also, it's worth checking the connections between battery terminals. If they are loose, the buttons might not work or even become stuck in their down position. Soldering the terminals and button's back in place is usually all it takes to restore the key fob that is not working to working condition.
Non-Remote Transponder Chips
The non-remote chips that are sealed are more durable than remote fobs, but they are susceptible to breaking if a hole is drilled in them or if a car door handle or lawnmowers plows over them. The failure of the fuse is usually the cause of non-remote chip failures.
If you're able to open a key fob that is sealed 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, head to your local hardware store or the Oreilly's and they will usually have an radio frequency tester that can tell you whether the key fob is transmitting a signal.
Programming
Key fobs aren't indestructible and are susceptible to being damaged by a lot of things. They may lose their connection to the car's receiver because of shock or a low battery, which requires the reprogramming. A professional auto locksmith or main dealer will be able to reprogram your key fob to get it back up and running. If resetting or replacing your keyfob does not work it may be necessary to replace it.