How to Fix a Key Fob That isn't Working
If your key fob doesn't work and you're not sure why, you can fix it by following just a few steps. First, ensure that it's not the backup remote.
If your backup remote cannot unlock and lock the doors of your vehicle, it is likely that the primary remote is not working. Most problems with car remote keys result from circuitry or battery problems.
Battery
It is not unusual for the battery in the car key fob to wear out. It is simple to replace the battery. However, it is important to select the right kind. You can consult the owner's manual or contact the manufacturer to determine the right type. It is also important to inspect the battery compartment, since batteries that are not working properly can release toxic chemicals that could damage the remote. If changing the batteries does not solve the problem it could be because there are other issues that require attention by a professional. If buttons are stuck or broken, for example it could be necessary to remove the remote and rebuild each component. You can also try reprogramming your vehicle to recognize the new key fob.
Buttons
Key fobs can get dirty and worn out from frequent use. This is not unusual, but it can cause buttons to stop functioning or require a long press to work. This can be extremely frustrating, especially if you are out of town and need to start your vehicle. Even broken or damaged buttons are often fixable with a little time and tools you already have at home.
First, ensure that the batteries are charged correctly and that the indentation on the back of the button is filled. Take the remote apart and examine the circuit board. Check for signs of rust or other signs the buttons are worn or damaged. For example, conductive paint may be missing. Use a Q-tip, dipped in rubbing alcohol to gently clean any membrane contact that has become worn-out or where conductive painting is missing. Don't rub too hard in order to damage the conductive paint and stop the button from firing when it is pressed.
Also, be sure to check the battery connector's terminals for any loose solder connections. If this is the case, connecting them back could restore function to the button. You can apply the same procedure to restore functionality to any other loose connection inside the fob.
If any of the rubber buttons on the front of the keyfob are not functioning or require to be pressing extremely hard the graphite disks at the back of the button could have worn out and will require replacement. This can be done by rubbing a pencil over the disks, which should bring the button back to its original state.
If none of this is helpful or if the button still doesn't respond to a hard push, then it may be the case that the circuit board itself is damaged. This can be fixed with a quick clean and replacing the solder, but it is best to have an extra fob available in the event this method doesn't work for you.
Circuitry
The circuit board inside the remote control could be dirty, regardless of whether the buttons on the key fob work or not. A very thorough inspection is often enough to resolve this issue. The most frequent causes of dirty circuit boards are water and broken cases. A broken case can let water and other debris to enter the circuit board, which can cause it to short. Water can also destroy pins and connectors on the board, referred to as via's.
If you're able to open your key fob, and 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're loose, the buttons might not function or get stuck in their down position. Soldering the terminals and buttons into place is usually enough to restore a non-working fob to working.
Non-Remote transponder chips
Sealed non-remote transponder chip are more durable than remote fobs they are contained in, but they can be broken by a hole being drilled into them or run over by a lawnmowers or car door handle. The failure of the fuse is usually to blame for non-remote chip failures.
If you're not comfortable opening the key fob, you can remove the circuitboard and use a multimeter to verify that the diode is functioning properly. If you're not comfortable with this, you can go to your local Oreilly or hardware store and use their RF frequency tester. car key repair near me will tell you whether the key fob sends an RF signal.
Programming
Key fobs aren't impervious to destruction and can be damaged by a variety of factors. They may lose their connection with the receiver in your vehicle due to shocks or a low battery, requiring reprogramming. A professional auto locksmith or dealer can reprogram your key fob to get it back up and running. If resetting or replacing your keyfob does not work, you may need to replace it.