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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. The first step is to make sure that it's not your backup remote.
If the backup is able to lock and unlock your car doors, then there is likely an issue with the primary remote. The most frequent causes of key problems with your car remote are circuitry or battery issues.
Battery
It is not unusual to find a battery on the car key fob to get worn out. It is relatively easy to change out a battery, although it is essential to make sure that you choose the correct type; you can look in your owner's manual or contact the dealer of the manufacturer to determine the type of battery you need. It's also a good idea to inspect the battery compartment thoroughly since dead batteries may leak caustic chemicals that can harm the remote. If changing the batteries does not 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 can also try reprogramming your vehicle to recognize the new key fob.
Buttons
Due to frequent use, key fobs may wear out and become dirty. It is not common for buttons to cease functioning, or require a hefty push to make them work. This can be very frustrating, especially when you are away from home and you need to start your car. Even worn-out or malfunctioning buttons can be fixed with a bit of time and the tools you already have at home.
First, make sure that the batteries are properly installed and that the indentation on the back of the button is filled. Then, carefully open the remote and inspect the circuit board. Check for signs of corrosion or other signs that the buttons are worn or damaged, such as missing conductive paint. Then, using a Q-tip dipped in alcohol, gently clean any membrane contacts that are damaged or where conductive paint is missing. Avoid rubbing Learn Alot more Here as this can erode the conductive painting and prevent the button from firing when it is pressed.
Examine the battery connector's terminals carefully for any loose solder connections. If this is the case, reconnecting them may bring back function to the button. You can use the same procedure to restore functionality to any other loose connection within the fob.
If any of the rubber buttons at the front of the keyfob aren't working or require being pressed extremely hard the graphite disks at the back of the button might have worn out and need to replaced. It is usually done by rubbing a pen across the disks. This should bring the button to life.
If none of this is helpful, or if the button does not respond to a firm press, then it may be because the circuit board has gone bad. It is possible to fix this by cleaning and re-soldering the fob however, you should have another spare in case it doesn't work.
Circuitry
If the key fob buttons function the circuit board in your remote might be dirty. This issue can be fixed through a thorough examination. The most frequent causes of dirty circuit boards are water and broken cases. A damaged case can allow water and other debris to enter the circuit board, which can cause it to short out. Water can also damage pins and small connectors on the board called via's.
If you're handy enough to open up your key fob and aren't afraid of making a mess, we can take off the buttons and then solder new ones in their place. It's also worth checking the connections between battery terminals. If they're loose, the buttons could not function or get stuck in their down position. Soldering the terminals and buttons back in their place is generally all that's needed to return the key fob that is not working to functioning condition.
Non-Remote transponder chips
The non-remote chips sealed in a sealed case are more durable than remote fobs, however they are susceptible to breaking when a hole is made in them, or when a door handle for a car or lawnmowers plows over them. The failure of the fuse is usually to blame for non-remote chip failures.
If you're handy enough to open a key fob that is sealed and are able to bear the mess, you can remove the circuit board and check the fuse using an instrument to verify diode function. If you don't feel comfortable with this, you can go to your local Oreilly or hardware store and use their RF frequency tester. This will let you know whether the key fob is sending an RF signal.
Programming
Key fobs take lots of abuse and aren't indestructible. They may lose their connection to the car's receiver due to shock or low battery, requiring the reprogramming. A professional auto locksmith or main dealer will be able to reprogram your key fob and get it back up and running. In the rarer case that resetting or repairing your key fob fails it could be the time to replace it entirely.