How to Fix a Key Fob That isn't Working
If your key fob does not work, you can fix it with just a few 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, then it is most likely that the primary remote isn't functioning. The most frequent causes of key problems with your car remote are battery or circuitry issues.
Battery
The battery inside a key fob can be worn out over time. It is relatively easy to change out batteries, but it is important to ensure that you use the right type that you can refer to your owner's manual or contact the dealer for the manufacturer to find out what kind of battery you require. It's also a good idea to examine the battery compartment carefully, as dead batteries sometimes release caustic chemicals that could cause damage to the remote. If replacing the batteries doesn't solve the issue it could be because there are other issues that require attention by a professional. For instance, if the buttons seem to be stuck or broken, it may be necessary to disassemble the remote and rebuild its components. You can also try reprogramming your vehicle to recognize the new key fob.
Buttons
Key fobs may become dirty and worn-out from frequent use. This is not unusual, but it can cause buttons to stop working or require a very hard press for them to work. This can be a huge hassle, especially if you are away from home and you need to start your vehicle. Even broken or damaged buttons can be fixed with a little effort and the tools you already have at home.
First, check that the batteries are properly installed and that the indentation at the back of the button has been filled. Then, carefully open up the remote and look at the circuit board. Examine for signs of rust or other indications that the buttons are worn or damaged, such as missing the conductive paint. Use the Q-tip, dipped in rubbing alcohol, gently clean any membrane contacts that have worn or where conductive paint is missing. Don't rub too hard in order to damage the conductive paint, and block the button from firing when it is pressed.
Examine the battery connector's terminals carefully for any loose solder connections. Soldering them back in place can restore the button's functionality if this is the situation. You can use the same process to restore functionality to any other loose connection within the fob.
If any of the rubber buttons on the front of the keyfob isn't functioning or require to be pressing extremely hard, the graphite disks at the back of the button might have worn out and require replacement. This can usually 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 does not respond to a hard push It could be because the circuit board has become damaged. It is possible to fix this by cleaning and re-soldering the button however, you should have a spare in case it does not work.
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Whether or not the keys fob buttons are functioning the circuit board in the remote could be dirty. A very thorough inspection is usually enough to fix this problem. The most common causes of dirty circuit boards is water and broken cases. A damaged case allows water and other debris to get in and short out the electronic components. Water can also destroy pins and connectors on the board, which are known as via's.
If you're handy enough to open up your key fob and don't mind a little 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 might not function or get stuck in their down position. Soldering the terminals and button's back into place is typically all that's required to return keys that are not in working condition.
Non-Remote transponder chips
Sealed non-remote transponder chips are more durable than remote fobs that have them however they are still susceptible to being cracked by a hole drilled into them or run over by a lawnmowers or door handle for a car. Fuse failures are usually the cause of non-remote chip failures.
If you're handy enough to open a sealed non-remote key fob and are willing to put up with the mess, you can easily remove the circuit board and check the fuse with a multimeter for proper diode function. If you don't feel comfortable with this, go to your local Oreilly or hardware store and utilize their RF frequency tester. This will let you know whether the key fob sends an RF signal.
Programming
Key fobs aren't indestructible and are susceptible to damage through a variety of causes. They may lose their connection with the receiver inside your vehicle due to shocks or a low battery, requiring changing the program. A professional auto locksmith or the main dealer can reprogram your key fob and get it back functioning again. In the rarer case that resetting and fixing your key fob doesn't work it could be the time to replace it completely.