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How to Fix a Key Fob That isn't Working

If your key fob doesn't work and you're not sure why, you can fix it with some simple steps. The first step is to be sure that it's not your backup remote.


If your backup remote cannot lock and unlock the doors of your car, then it is likely that the primary remote isn't functioning. Most car remote key failures are caused by circuitry or battery issues.

Battery

The battery in the key fob could wear out over time. It is simple to replace the battery. However it is essential that you choose the right kind. You can consult your owner's manual or call the manufacturer to inquire about the right kind. It is recommended to examine the battery compartment with care because dead batteries can leak harmful chemicals that can cause damage to the remote. If changing the batteries does not solve the issue, it may be that there are other issues that require attention from a professional. If the buttons are damaged or stuck for instance, it may be necessary remove the remote and rebuild each component. You can also try reprogramming your car to recognize the new key fob.

Buttons

Key fobs can get dirty and worn-out from repeated use. It is not common for buttons to cease functioning, or require a hard push to make them work. This can be very frustrating, especially if you are out of town and need to start your car. Even broken or damaged buttons can be fixed with a bit of time and tools you already have at home.

First, check that the batteries are charged correctly and that the indentation on the back of the button is filled. Then, carefully open up the remote and inspect the circuit board. Examine for signs of rust or other indications that the buttons are worn out or damaged, such as missing the conductive paint. Utilizing a Q-tip dipped in alcohol to gently clean any membrane contacts that have become worn or have conductive paint missing. Don't rub too hard in order to damage the conductive paint and stop the button from firing when it is pressed.

Check the battery connector's terminals carefully for any loose solder connections. If this is the case, reconnecting them could bring back function to the button. You can follow the same procedure to restore functionality to any other loose connection inside the fob.

If any of the rubber buttons located at the front of the keyfob isn't functioning or require to be pressing very hard the graphite disks on the back of the button may have worn out and need to replaced. You can do this by rubbing a pen across the disks. This should bring the button to life.

If none of these solutions work or you cannot get the button to respond when you press it hard, it could be that the circuitry has failed. This can be fixed with a quick clean and re-soldering, but it is ideal to have a spare fob on hand in the event that this method fails for you.

Circuitry

Whether or not the key fob buttons are working the circuit board in the remote could be dirty. This issue can be fixed through a thorough examination. The most common causes of dirty circuit boards is water and damaged cases. A damaged case can let water and other debris to get into the circuit board, causing it to short out. Water can also get through pins and vias, which are tiny connectors that are found on the board.

If you're handy enough to open up your key fob, and you're not afraid of some mess, we can de-solder the buttons and solder new ones in their place. It's also worth checking the battery terminal connections. They can get very dirty and if they're loose, the buttons may not work or even stay in their down position. Soldering terminals and buttons back to their original positions is often enough to return a malfunctioning fob to working.

Non-Remote transponder chips

Sealed non-remote transponder chips are much more durable than the remote fobs that have them but they can still be cracked by a hole made in them or pushed over by a lawnmowers blade or car door handle. The failure of the fuse is usually the cause of non-remote chip failures.

If key car repair to open a key fob that is sealed and are able to bear the mess, you can easily remove the circuit board and test the fuse with an instrument to verify diode function. If you're not confident doing this, visit your local hardware store or Oreilly's and they'll usually have a RFID frequency tester that can determine if the key fob is sending signals.

Programming

Key fobs take lots of abuse and aren't impervious to damage. They may lose their connection to the receiver in your car because of shock or a low battery, which requires the reprogramming. A professional auto locksmith or a dealer in the main, can reprogram your keyfob and get it working again. If resetting or repairing your key fob fails it is possible to replace it.

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