How to Fix a Key Fob That isn't Working
If your key fob won't work then you can fix it with some simple steps. First, make sure that it's not your backup remote.
If your backup remote is unable to lock and unlock the doors of your car, it is likely that the primary remote isn't functioning. Most problems with car remote keys result from circuitry or battery issues.
Battery
It is not unusual for the battery inside the key fob for cars to degrade. It is fairly easy to replace the battery, however it is essential to ensure that you choose the correct type; you can look in your owner's manual, or contact the dealer for the manufacturer to determine the type of battery you require. It's recommended to examine the battery compartment carefully since dead batteries may leak caustic chemicals that can cause damage to the remote. If replacing the battery does not fix the issue, there may be other issues that require professional attention. For instance, if the buttons seem stuck or damaged 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.
mobile car key repair may become dirty and worn-out from frequent use. This is not unusual however it can cause buttons to stop functioning or require a long press to work. This can be a huge hassle particularly if you're out of town and need to start your vehicle. Even worn-out or malfunctioning buttons can be fixed with a little effort and tools you already have at home.
First, make sure that the batteries are correctly installed and that the indentation at the back of the button is filled. Take the remote apart and inspect the circuit board. Look for signs of corrosion or other indications that buttons are worn out or damaged, such as missing the conductive paint. Then, using a Q-tip that has been dipped in alcohol, gently clean any membrane contacts that have become worn or where conductive paint is missing. Avoid rubbing too hard, as this can erode the conductive painting and prevent the button from firing when it is the button is pressed.
Examine the battery connector's terminals carefully for any loose solder connections. Soldering them back into place will restore the button's functionality If this is the case. You can follow the same procedure to restore functionality to any other loose connection in the fob.
Finally, if any of the buttons made of rubber that are on the front of the key fob aren't functioning or require a hard press to work it is likely that the graphite disks on the back of the button are deteriorating and require replacement. This is usually done by rubbing a pencil on the disks. This should bring the button back to life.
If none of this is helpful or if the button still doesn't respond to a hard press It could be that the circuit board has become damaged. It is possible to fix the issue by cleaning and re-soldering the button however, you should have another spare in case it does not work.
Circuitry
Whether or not the keys fob buttons are functioning the circuit board in the remote could be dirty. A very thorough inspection is often enough to resolve this issue. Broken and damaged cases are the most frequent causes of dirty boards. A broken case can allow water and other debris to enter the circuit board, which can cause it to short out. Water can also damage pins and vias, which are small connectors on the board.
If you're able to open your key fob and don't mind a little mess, we can de-solder the buttons and then solder new ones in their place. It's also worth checking the battery terminal connections. They can get very filthy and if they're not tight enough, the buttons might not work or even stay in their down position. Soldering the terminals and buttons back in place is usually all it takes to restore the key fob that is not working to working order.
Non-Remote Transponder Chips
Sealed non-remote transponder chip 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 lawnmowers or door handle for a car. Failures of the fuse are typically to blame for non-remote chips failures.
If you're handy enough to remove a sealed non-remote key fob and are able to bear the mess, you can remove the circuit board and examine the fuse with an instrument to verify diode function. If you're not comfortable with this, go to your local Oreilly or hardware store and use their RF frequency tester. This will let you know whether the key fob is sending a signal.
Programming
Key fobs endure lots of abuse and aren't impervious to damage. They can break their connection with the receiver in your vehicle because of shocks or a low battery, which calls for changing the program. A professional auto locksmith, or main dealer can reprogram your keyfob to get it up and running again. If resetting or replacing the keyfob is not working, you may need to replace it.