How to Fix a Key Fob That isn't Working
If your key fob doesn't work A few easy steps can fix it. First, make sure that it's not your backup remote.
If your backup remote is unable to lock and unlock the doors of your car, it is most likely that the primary remote isn't functioning. The most common causes for car remote key failure are circuitry or battery issues.
Battery
The battery in the key fob could wear out over time. It is easy to replace batteries. However it is essential that you choose the right type. You can check the owner's manual or contact the manufacturer to find out the right type. It is also essential to examine the battery compartment, as dead batteries can leak toxic chemicals that could damage the remote. If changing the batteries does not solve the issue, it may be that there are other issues that require attention by a professional. If the buttons are damaged or stuck, for example, it may be necessary take the remote apart and rework each component. You can also try reprogramming the vehicle to recognize the new device.
Buttons
Due to frequent use, key fobs may get dirty and worn. It is not unusual to have buttons stop working, or to require a long press to make them work. This can be very frustrating, especially when you are away from home and need to start your car. Even broken or damaged buttons can be fixed with a little effort and materials you already have at home.
First, make sure the batteries are properly charged and that the indentation on the back of the button is filled. Then, open the remote with care and look over the circuit board. Examine for signs of rust or other indications that the buttons are worn out or damaged, like missing the conductive paint. Utilizing the Q-tip, dipped in rubbing alcohol, gently clean any membrane contacts that have damaged or where conductive paint is missing. Do not rub too vigorously in order to damage the conductive paint, and block the button from firing when you press it.
Check the battery connector terminals for loose solder connections. Soldering them back into place will allow the button to function again if this is the situation. The same process can be used to restore function to any other loose connections within the fob.
If any of the rubber buttons located at the front of the keyfob isn't working or need to be pressing very hard the graphite disks on the back of the button could have worn out and will need to replaced. This can usually be done by rubbing a pencil on 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, then it may be because the circuit board itself is damaged. It is possible to fix the issue by cleaning and re-soldering the fob, but you should have an extra in case it doesn't work.
Circuitry
Whether or not the keys fob buttons are functioning the circuit board that is inside the remote could be dirty. A very thorough inspection is often enough to resolve this problem. The most common causes for dirty circuit boards is water and damaged cases. A damaged case can allow water and other debris to pass through and short out the electronics. Water can also get through pins and vias, which are the tiny connectors found on the board.
If you're handy enough to open your key fob and don't mind a little mess, we can de-solder the buttons and put new ones in their place. It's also worth examining the battery terminal connections. If repair car key , the buttons may not function or get stuck in their down position. Soldering the terminals and button's back in their place is generally all that's required to return the key fob that is not working to functioning condition.
Non-Remote transponder chips
Sealed non-remote transponder chips are more durable than remote fobs that contain them but they can still be broken by a hole being that is drilled into them or over by a lawnmowers blade or car door handle. Read the Full Article of the time non-remote transponder chips fail, and this can be blamed on blowing fuses.
If you're able to remove a key fob that is sealed and can tolerate the mess, you can take off the circuit board and test the fuse using an instrument to verify diode function. If you don't feel comfortable with this, visit your local Oreilly or hardware store and test their RF frequency tester. This will inform you whether the key fob transmits signals.
Programming
Key fobs aren't impervious to destruction and can be damaged through a variety of causes. They may lose their connection to the car's receiver due to shock or a low battery, which calls for them to be reprogrammed. A professional auto locksmith or the main dealer can reprogram the keyfob and get it working again. If resetting or replacing your key fob fails it is possible to replace it.