How to Fix a Key Fob That isn't Working
If your key fob isn't working There are a few simple steps that can be taken to fix it. First, check to make sure it's not your backup remote.
If your backup remote cannot unlock and lock the doors of your vehicle, it is likely that the main remote isn't functioning. The most common causes for key problems with your car remote are battery or circuitry issues.
Battery
It is not uncommon to find a battery on the key fob for cars to degrade. It is easy to replace a battery. However, it is important to select the right kind. You can check the owner's manual or contact the manufacturer to find out the right kind. It's recommended to examine the battery compartment carefully because dead batteries can release caustic chemicals that could harm the remote. If replacing the battery does not solve the issue there may be additional issues that require attention from a professional. If the buttons are damaged or stuck for instance it could be necessary to remove the remote and rebuild each component. You could also try reprogramming the vehicle to recognize the new remote.
Buttons
From frequent use, key fobs could become worn and dirty. This is not atypical however, it can cause buttons to stop functioning or require a hard press for them to function. This can be a hassle especially when you're away from your home and you need to turn on your car. Fortunately, even worn-out or broken buttons can usually be fixed with a bit of time and some of the materials you may already have around the house.
First, make sure the batteries are properly charged and that the indentation on the back of the button is filled. Take the remote apart and look over the circuit board. Examine for signs of rust or other signs that the buttons are worn or damaged, like missing the conductive paint. Then, using a Q-tip dipped in alcohol to gently clean any membrane contacts that are worn or have conductive paint missing. Don't rub too hard in order to damage the conductive paint and stop the button from firing when you press it.
Also, make sure to inspect the battery connector terminals for any loose solder connections. If this is the case, simply connecting them back could restore functionality to the button. The same procedure can be used to restore function to any loose connections within the fob.
If any of the rubber buttons on the front of the keyfob isn't working or require being pressing very hard the graphite disks on the back of the button might have worn out and will need to replaced. You can do this by rubbing a pencil over the disks. This should bring the button to life.
If none of this is useful, or if the button doesn't respond to a firm press, then it may be that the circuit board is damaged. This can sometimes be repaired by a quick clean and replacing the solder, but it is best to have an extra fob on hand in the event that this method doesn't work for you.
Circuitry
The circuit board in your remote control may be dirty regardless of whether the buttons on the key fob function or not. This issue can be fixed by a thorough inspection. The most common causes of dirty circuit boards is water and broken cases. A broken case allows water and other debris to get in and short out the electronics. mobile car key repair can also damage pins and connectors that are small on the board, referred to as via's.
If you're skilled enough to open your key fob, and you don't mind making an mess, you can take the buttons out of their sockets and solder in new ones. Also, you should check the connections between the battery terminals. They can become extremely dirty and if they're loose, the buttons might not function or may even remain in their down position. Soldering the terminals, and putting the button back in their place is generally all that's required to return 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 that contain them but they can be damaged by a hole that is made in them or pushed over by a lawnmowers blade or car door handle. Failures of the fuse are typically to blame for non-remote chips failures.
If you're handy enough to open up a sealed non-remote key fob and are able to bear the mess, you can take off the circuit board and test the fuse using a multimeter to ensure that it is functioning as intended. function. If you're not confident doing this, go to your local hardware store or Oreilly's, and they usually have an RFID frequency tester that can let you know whether the key fob is transmitting a signal.
Programming
Key fobs aren't impervious to destruction and are susceptible to being damaged by a lot of things. They can break their connection with the receiver in your vehicle due to shocks or a low-battery, which requires changing the program. A professional auto locksmith or dealer can reprogram your key fob and get it working again. If resetting or replacing your keyfob does not work, you may need to replace it.