How to Fix a Key Fob That isn't Working
If your key fob does not work, you can fix it by following a few simple steps. The first step is to make sure that it's not your backup remote.
If your backup remote is unable to unlock and lock the doors of your vehicle, it is most likely that the primary remote isn't functioning. The majority of car remote key malfunctions result from circuitry or battery issues.
Battery
It is not uncommon to find a battery on the car key fob to get worn out. It is quite simple to change out the battery, however it is important to ensure that you use the right type and you can consult the owner's manual or talk to the dealer for the manufacturer to find out what kind of battery you need. It is recommended to inspect the battery compartment thoroughly because dead batteries can release caustic chemicals that could cause damage to the remote. If changing the battery doesn't fix the issue there may be additional issues requiring professional attention. For instance, if the buttons seem to be stuck or broken, it may be necessary to disassemble the remote and rework its components. You can also try reprogramming the vehicle to recognize the new key fob.
Buttons
Due to repeated use, key fobs could get dirty and worn. It is not uncommon to have buttons stop functioning, or require a hard press to make them work. This can be very frustrating, especially when you are away from home and need to switch on your car. Even worn-out or malfunctioning buttons are often fixable with a little effort and the tools you already have at home.
First, ensure that the batteries are up correctly and that the indentation on the back of the button is filled. Then, open the remote with care and inspect the circuit board. Check for signs of rust or other indications that the buttons are damaged or worn. For example there could be conductive paint missing. Use a Q-tip that has been dipped in rubbing alcohol to gently clean any membrane contact that has damaged or has conductive paint missing. Do not rub too vigorously, as this could erode the conductive paint, and block the button from firing when you press it.
Also, make sure to inspect the battery connector's terminals to ensure a loose solder connection. If this is the case, simply connecting them back can restore functionality to the button. You can apply the same process to restore functionality to any other loose connection inside the fob.
In the end, if any of the buttons made of rubber that are on the front of the key fob aren't functioning or require a difficult press to function it is likely that the graphite disks at the back of the button are deteriorating and need to be replaced. It is usually done by rubbing a pen across the disks. This should bring the button to life.
If mobile car key repair near me of these solutions work, or if you still are unable to get the button to respond when pressed hard, it is possible that the circuitry is failing. This can sometimes be repaired with a quick clean and replacing the solder, but it is best to have an extra fob available in the event this method does not work for you.
Circuitry
Whether or not the keys fob buttons are functioning, the circuit board inside the remote could be dirty. A thorough inspection is often enough to resolve this problem. Broken and damaged cases are the most common causes of boards that are dirty. A damaged case could allow water and other debris to enter the circuit board, which can cause it to short out. Water can also get through pins and vias, which are small connectors on the board.
If you are handy enough to open your key fob, and aren't afraid of making a mess, we can take the buttons out of their sockets and then solder new ones. It's also worth checking the battery terminal connections. They can get very dirty and if they're loose, the buttons might not work or may even remain in their down position. Soldering terminals and buttons back into place is usually enough to bring a non-working fob to working.
Non-Remote Transponder Chips
Sealed non-remote transponder chip are more durable than remote fobs that contain them but they can be damaged by a hole that is made in them or pushed over by a lawnmower or car door handle. The failure of the fuse is usually the cause of non-remote chip failures.
If you're handy enough to remove the sealed key fob and can tolerate the mess, you can take off the circuit board and check the fuse with an instrument to verify diode function. If you're not sure with this, visit your local Oreilly or hardware store and use their RF frequency tester. This will inform you whether the key fob transmits signals.
Programming
Key fobs endure lots of abuse and aren't indestructible. They may lose their connection to the receiver in your car due to shock or low battery, requiring them to be reprogrammed. A professional auto locksmith or a main dealer can reprogram your key fob to get it functioning again. If resetting or replacing your keyfob does not work, you may need to replace it.
