How to Fix a Key Fob That isn't Working
If your key fob does not work then you can fix it with a few simple steps. The first step is to make sure that it's not the backup remote.
If the backup can lock and unlock your car doors, then there is likely an issue with the main remote. The most common causes of key problems with your car remote are circuitry or battery issues.
Battery
The battery inside a key fob can be worn out over time. It is quite simple to replace batteries, but it is crucial to make sure that you use the right type; you can look in your owner's manual or contact the manufacturer's dealer to find out the kind of battery you require. It is also essential to check the battery compartment as dead batteries can leak caustic chemicals which can damage the remote. If replacing the battery does not fix the problem there may be additional issues that require attention from a professional. For instance, if buttons seem stuck or broken, it may be necessary to take the remote apart and rework its components. 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. It is not unusual for buttons to cease working, or to require a hard press to make them work. This can be extremely frustrating especially if you're away from home and you need to start your vehicle. Fortunately, even worn out or damaged buttons can be fixed with a little time and a few materials you have in the house.
First, check that the batteries are charged correctly and that the indentation on the back of the button is filled. Open the remote carefully and examine the circuit board. Examine for evidence of rust, or other signs the buttons have been damaged or worn. For car key repair cost , conductive paint may be missing. Then, using a Q-tip dipped in rubbing alcohol, gently clean any membrane contacts that have become worn or where conductive paint is missing. Avoid rubbing too hard, as this can erode the conductive paint and stop the button from firing when pressed.
Examine the battery connector's terminals for loose solder connections. Soldering them back to their original position can restore the button's functionality If this is the situation. The same process can be used to restore function to any loose connections within the fob.
In the end, if any of the rubber buttons on the front of the key fob stop working or require a long press to function it is likely the graphite disks at the back of the button are wearing down and require replacement. This is usually done by rubbing a pencil across the disks, which should bring the button back to working.
If none of these solutions work, or if you still not be able to get the button respond when you press it hard, it is possible that the circuitry is failing. It is possible to fix this by a quick clean and refitting, but it's best to have an extra fob available in the event this method does not 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. Broken and damaged cases are the most common causes of boards that are dirty. A damaged case can allow water and other debris into the circuit board, causing it to short. Water can also eat away at pins and connectors on the board called via's.
If you're able to remove your key fob and don't mind some mess, we can take off the buttons and solder new ones in their place. Also, you should check the connections between the battery terminals. They can become extremely filthy and if they're not tight enough, the buttons might not work or may even remain in their down position. Soldering the terminals back to their proper positions is usually enough to return a malfunctioning fob to a working condition.
Non-Remote transponder chips
The non-remote chips that are sealed are more durable than their remote fobs, but they can be cracked in the event of a hole being drilled into them or in the event that a door handle of a car or lawnmowers is pushed over them. The majority of non-remote transponder chip malfunctions can be blamed on a blown fuse.
If you are not comfortable opening the key fob, you can remove the circuitboard and use a multimeter to verify that the diode is operating properly. If you don't feel comfortable with this, you can go to your local Oreilly or hardware store and test their RF frequency tester. This will let you know whether the key fob is sending signals.
Programming
Key fobs aren't indestructible and are susceptible to damage by a variety of factors. They may lose their connection with the receiver inside your vehicle due to shocks or a low-battery, which requires the reprogramming. A professional auto locksmith or the main dealer, can reprogram your key fob and get it back working again. If resetting or replacing the keyfob is not working it is possible to replace it.