How to Fix a Key Fob That isn't Working
If your key fob won't work then you can fix it by following just a few steps. First, check to make sure it's not the backup remote.
If your backup remote is unable to lock and unlock the doors of your car, then it is most likely that the primary remote is not working. The most common causes for key problems with your car remote are issues with the circuitry or battery.
Battery
The battery inside the key fob may wear out over time. It is quite simple to replace the battery, however it is important to ensure you choose the correct type; you can look in the owner's manual or talk to the dealer for the manufacturer to determine the type of battery you require. It's recommended 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 problem it could be that there are other issues that require professional attention. For instance, if the buttons appear stuck or damaged It may be necessary to disassemble the remote and rework its components. You can also try reprogramming your vehicle to recognize the new key fob.
Buttons
Due to frequent use, key fobs can get dirty and worn. This is not unusual however, it can cause buttons to cease functioning or require a hard press for them to work. This can be very frustrating, especially if you are away from home and you need to start your car. Even broken or damaged buttons can be fixed with a little time and materials you already have at home.
First, verify that the batteries are properly placed and that the indentation at the back of the button is filled. Then, carefully open up the remote and look at the circuit board. Examine for indications of rust or other indications that the buttons are damaged or worn. For instance, conductive paint may be missing. Then, using the Q-tip, dipped in alcohol, gently clean any membrane contacts that have become worn or have conductive paint missing. Avoid rubbing too hard, because this could damage the conductive paint and stop the button firing when it is pressed.
Examine the battery connector's terminals carefully for any loose solder connections. Soldering them back to their original position can restore the button's functionality If this is the case. The same method can be used to restore function to any loose connections within the fob.
If, for instance, any of the buttons made of rubber on the front of the key fob aren't working or require a difficult press to function, it is likely that the graphite disks that are on the back of the button are deteriorating and require replacement. This can be done by rubbing a pencil across the disks, which should bring the button back to working.
If none of this is useful, or if the button still does not respond to a hard push, then it may be because the circuit board itself has gone bad. It is possible to fix this issue by cleaning and re-soldering the button, but you should have an extra in case it does not work.
Circuitry
If the key fob buttons are working the circuit board that is inside your remote might be dirty. This problem can be resolved through a thorough examination. The most common causes of dirty circuit boards is water and broken cases. A damaged case allows water and other debris to pass through and short circuit the electronics. Water can also destroy pins and connectors on the board, referred to as via's.
If you're handy enough to open your key fob and aren't afraid of making a mess, we can remove the solder from the buttons and then solder new ones in their place. It's also worth checking the connections between battery terminals. car key repair shop near me can get very dirty and if they're loose, the buttons may not work or may even remain in their down position. Soldering the terminals and buttons back in place is usually all that's needed to return a non-working key fob to working order.
Non-Remote Transponder Chips
The non-remote chips sealed in a sealed case are more durable than remote fobs, however they can be cracked in the event of a hole being drilled into them or when a door handle for a car or lawnmower runs over them. Most of the time non-remote transponder chip malfunctions could be attributed to blowing fuses.
If you're able to open a sealed non-remote key fob and can tolerate the mess, you can easily remove the circuit board and test the fuse with a multimeter for proper diode function. If you're not confident doing this, visit your local hardware store or Oreilly's and they usually have a RF frequency tester that will let you know if the key fob is sending signals.
Programming
Key fobs are subject to a lot of abuse and aren't indestructible. They can lose their pairing to the receiver in your car because of shock or a low battery, requiring them to be reprogrammed. A professional auto locksmith or main dealer can reprogram your key fob and get it back functioning again. If, in the unlikely event that resetting and repairing your key fob isn't working, it could be time to replace it all over again.