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 with a few simple steps. The first step is to be sure that it's not your backup remote.
If your backup remote is unable to unlock and lock the doors of your car, it is most likely that the primary remote isn't working. The most common causes of key problems with your car remote are battery or circuitry issues.
Battery
The battery in the key fob could be worn out over time. It is easy to replace the battery. However it is crucial that you use the correct kind. You can consult the owner's manual or contact the manufacturer to determine the right type. It is also crucial to check the battery compartment, since batteries that are not working properly can release toxic chemicals that could damage the remote. If replacing car key repair cost does not solve the issue there may be additional issues that require attention from a professional. If the buttons are stuck or broken, for example it might be necessary to remove the remote and rebuild each component. You can also try reprogramming the vehicle to recognize the new remote.
Buttons
Key fobs can become dirty and worn out from repeated use. It is not common for buttons to stop functioning, or require a hefty push to make them work. This can be a hassle, especially when you are away from home and have to start your car. Fortunately, even worn-out or malfunctioning buttons can often be fixed with a bit of time and a few items you have in the home.
First, make sure the batteries are properly charged and that the indentation on the back of the button is filled. Then, carefully remove the remote and inspect the circuit board. Examine for signs of rust or other indications that the buttons have been worn or damaged. For example there could be conductive paint missing. Use a Q-tip that has been dipped in alcohol to gently clean any membrane contact that is damaged or has conductive paint missing. Avoid rubbing too hard since this could cause damage to the conductive paint and stop the button from firing when it is pressed.
Check the battery connector's terminals carefully for any loose solder connections. If this is the case, simply reconnecting them may restore function to the button. You can use the same procedure to restore functionality to any other loose connection in the fob.
If any of the rubber buttons located at the front of the keyfob are not working or need to be pressed extremely hard the graphite disks on the back of the button may have worn out and will require replacement. This can usually be done by rubbing a pencil over the disks, which should bring the button back to working.
If none of these solutions work or you not be able to get the button respond when you press it hard, it is possible that the circuitry has failed. It is possible to fix this with a quick clean and re-soldering, 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 of your remote control may be dirty regardless of whether the buttons on the key fob are working or not. This problem can be resolved through a thorough examination. The most frequent causes of dirty circuit boards are water and broken cases. A damaged case could let water and other debris to get into the circuit board, causing it to short. auto key repair can also eat away at pins and connectors on the board, which are known as via's.
If you're able to open your key fob and don't mind a little mess, we can take off the buttons and put new ones in their place. It's also worth looking at the battery terminal connections. They can get very dirty and if they're loose the buttons might not function or even stay in their down position. Soldering the terminals, and putting the button back in their place is generally all that's required to return keys that are not in functioning condition.
Non-Remote transponder chips
Sealed non-remote transponder chip are more durable than the remote fobs that contain them however they are still susceptible to being cracked by a hole made in them or pushed over by a lawnmower or car door handle. Most of the time, non-remote transponder chips fail, and this can be blamed on blowing fuses.
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 check the fuse with an instrument to verify diode function. If you're unsure about doing this, head to your local hardware store or the Oreilly's and they usually have a RFID frequency tester that can determine whether the key fob is sending a signal.
Programming
Key fobs aren't impervious to destruction and are susceptible to being damaged by a variety of factors. They can break their connection with the receiver inside your vehicle due to shocks or a low battery, which calls for the reprogramming. A professional auto locksmith or main dealer will be able to reprogram your key fob and get it working again. If resetting or fixing your key fob fails, you may need to replace it.