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 fix it. First, ensure that it's not the backup remote.
If your backup remote can unlock and lock the doors of your car, then it is likely that the main remote isn't functioning. The most frequent causes of key problems with your car remote are circuitry or battery issues.
Battery
The battery in a key fob can be worn out over time. remote key fob repair is simple to replace the battery. However it is crucial that you choose the right type. You can check your owner's manual or call the manufacturer to determine the right type. It is also essential to examine the battery compartment, since dead batteries can leak caustic chemicals which can damage the remote. If changing the batteries doesn't solve the issue it could be that there are other issues that require attention from a professional. If buttons are broken or stuck for instance, it may be necessary take the remote apart and rework each component. You could also try reprogramming your vehicle to recognize the new key fob.
Buttons
Key fobs can get dirty and worn out from repeated use. It is not uncommon for buttons to stop functioning, or require a hard push to make them work. This can be very frustrating especially if you're out of town and need to start your vehicle. Fortunately, even worn out or damaged buttons can be fixed with just a bit of time and a few materials you have in the house.
First, check that the batteries are up correctly and that the indentation on the back of the button is filled. Then, open the remote with care and inspect the circuit board. Check for signs of corrosion or other indications that buttons are worn out or damaged, like missing the conductive paint. Use a Q-tip that has been dipped in alcohol to gently clean any membrane contact that has become damaged or has conductive paint missing. Do not rub too vigorously, as this could erode the conductive paint and stop the button from firing when it is pressed.
Check the battery connector terminals carefully for any loose solder connections. Soldering them back to their original position can restore the button's functionality in the event that this is the situation. You can apply the same process to restore functionality to any other loose connection inside the fob.
If any of the rubber buttons on the front of the keyfob aren't functioning or require to be pressed very hard the graphite disks on the back of the button might have worn out and will require replacement. It is usually done by rubbing a pencil over the disks. This will bring the button back to life.
If none of these solutions work, or if you still not be able to get the button respond when pressed hard, it could be that the circuitry has failed. This can sometimes be repaired with a quick clean and re-soldering, but it is ideal to have a spare fob in case this method fails for you.
Circuitry
If the keys fob buttons are functioning the circuit board in your remote may be dirty. A thorough inspection is often enough to resolve this problem. Broken and damaged cases are the most frequent causes of dirty boards. A damaged case could allow water and other debris to enter the circuit board, causing it to short. Water can also get through pins and vias, which are small connectors on the board.
If you're able to open up your key fob and aren't afraid of a little mess, we can de-solder the buttons and solder new ones in their place. Also, it's worth checking the connections between battery terminals. If they're loose, the buttons may not function or get stuck in their down position. Soldering the terminals, and putting the button back in place is usually all that's needed to return a non-working key fob to working condition.
Non-Remote transponder chips
The non-remote chips sealed in a sealed case are more durable than remote fobs. However, they can be cracked if a hole is drilled into them or when a door handle for a car or lawnmower runs over them. Failures of the fuse are typically to blame for non-remote chip failures.
If you're handy enough to open the sealed key fob and are able to bear the mess, you can take off the circuit board and examine the fuse with an instrument to verify diode function. If you're not comfortable with this, you can visit your local Oreilly or hardware store and utilize their RF frequency tester. This will inform you whether the key fob transmits a signal.
Programming
Key fobs are subject to many abuses and aren't impervious to damage. They can break their connection with the receiver in your vehicle due to shocks or a low battery, which calls for changing the program. A professional auto locksmith or main dealer, can reprogram your keyfob and get it functioning again. If, in the unlikely event that resetting or repairing your key fob isn't working, it could be time to replace it completely.