How to Fix a Key Fob That isn't Working
If your key fob isn't working A few easy steps can be taken to fix it. First, make sure that it's not your backup remote.
If the backup remote is able to lock and unlock your car doors it is most likely an issue with the primary remote. a fantastic read for key problems with your car remote are issues with the circuitry or battery.
Battery
It is not uncommon for the battery in a key fob for cars to wear out. It is simple to replace the battery. However it is essential to select the right kind. You can consult the owner's manual or contact the manufacturer to determine the correct type. It is also a good idea to examine the battery compartment thoroughly since dead batteries may leak harmful chemicals that can cause damage to the remote. If replacing the battery does not solve the issue there could be other issues that require professional attention. If the buttons are broken or stuck, for example it could be necessary to take the remote apart and rework each component. It is also possible to reprogramme the vehicle to recognize the new remote.
Buttons
Due to frequent use, key fobs could get dirty and worn. This is not uncommon however, it can cause buttons to stop working or require a very difficult press to get them to function. This can be a hassle particularly when you're away from home and need to switch on your car. Fortunately, even worn-out or damaged buttons can be fixed with a bit of time and a few materials you may already have around the home.
First, make sure 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 examine the circuit board. Examine for evidence of rust, or other signs the buttons have been worn or damaged. For example the paint that conducts electricity could be missing. Use a Q-tip dipped into alcohol to gently clean any membrane contact that is worn out or where conductive paint is missing. Do not rub too vigorously in order to damage the conductive paint and stop the button from firing when it is pressed.
Check the battery connector terminals for loose solder connections. Soldering them back in place will allow the button to function again in the event that this is the situation. The same method can be used to restore function to any loose connections within the fob.
If any of the rubber buttons at the front of the keyfob are not working or require being pressing extremely hard the graphite disks at the back of the button could have worn out and require replacement. You can usually do this by rubbing a pen over the disks. This should bring the button back to life.
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 is failing. This can sometimes be repaired by a quick clean, and refitting, but it's recommended to have an additional fob available in the event this method does not work for you.
Circuitry
The circuit board in your remote control could be dirty, regardless of whether the buttons on the key fob work or not. This issue can be fixed through a thorough examination. The most common causes of dirty circuit boards is water and broken cases. A damaged case can allow water and other debris to enter and short out the electronics. Water can also destroy pins and connectors that are small on the board, which are known as via's.
If you're able to open up your key fob and don't mind making a mess, we can remove the solder from 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 properly or become stuck in their down position. Soldering the terminals and button's back into place is typically all it takes to restore the key fob that is not working to working order.
Non-Remote transponder chips
The non-remote chips sealed in a sealed case are more durable than remote fobs, but they are susceptible to cracking if a hole is drilled in them, or if a car door handle or lawnmowers plows over them. Most of the time non-remote transponder chip failures could be attributed to blowing fuses.
If you're not comfortable opening the key fob, you can take the circuit board off and use a multimeter to verify that the diode is working correctly. If you're not comfortable doing this, head to your local hardware store or Oreilly's, and they usually have a radio frequency tester that can determine if the key fob is sending signals.
Programming
Key fobs aren't impervious to destruction and can be damaged by a lot of things. They may lose their connection to the receiver in your car due to shock or a low battery, requiring the reprogramming. A professional auto locksmith or dealer will be able to reprogram your key fob to get it functioning again. If resetting or replacing the keyfob is not working it is possible to replace it.