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How to Fix a Key Fob That isn't Working

If your key fob won't work then you can fix it by following some simple steps. The first step is to make sure that it's not the backup remote.

If your backup remote cannot unlock and lock the doors of your vehicle, it is most likely that the primary remote is not working. The most frequent causes of key malfunctions for car remotes are battery or circuitry issues.

Battery

The battery inside the key fob may be worn out over time. It is fairly easy to change out batteries, but it is important to ensure you choose the correct type that you can refer to the owner's manual or talk to the dealer of the manufacturer to determine the type of battery you require. It is also important to examine the battery compartment as batteries that are not working properly can release caustic chemicals which can damage the remote. If changing the batteries does not solve the problem, it may be that there are other 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 parts. You can also try reprogramming the vehicle to recognize the new remote.

Buttons

Due to frequent use, key fobs could wear out and become dirty. It is not uncommon for buttons to stop functioning, or require a long push to make them work. This can be extremely frustrating especially if you're away from home and need to start your vehicle. Even worn-out or malfunctioning buttons can be fixed with a bit of time and tools 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, carefully open the remote and examine the circuit board. Examine for signs of rust or other indications that the buttons are damaged or worn out. For example there could be conductive paint missing. Then, using the Q-tip, dipped in alcohol, gently clean any membrane contacts that have become worn or where conductive paint is missing. Be careful not to rub too hard, as this can erode the conductive paint and block the button from firing when it is pressed.

Check the battery connector terminals for loose solder connections. If this is the case, reconnecting them may bring back function to the button. You can apply the same method to restore functionality to any other loose connection within the fob.

If any of the rubber buttons on the front of the keyfob aren't working or require being press extremely hard, the graphite disks at the back of the button could have worn out and will need to replaced. You can usually 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 is failing. It is possible to fix this issue by cleaning and re-soldering the button however, you should have another spare in case it does not work.

Circuitry

If the keys fob buttons are functioning the circuit board in the remote could be dirty. A thorough inspection will usually resolve this issue. Broken and damaged cases are the most common causes of dirty boards. A damaged case could let water and other debris to enter the circuit board, causing it to short out. Water can also get through pins and vias, which are small connectors found on the board.

If you're handy enough to open your key fob and aren't afraid of 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 dirty and if they're loose the buttons may not work or remote key repair may even remain in their down position. Soldering the terminals and buttons to their original positions is often enough to restore a non-working fob to a working condition.

Non-Remote transponder chips

Sealed non-remote transponder chips are much more durable than the remote fobs they are contained in, but they can still be broken by a hole being that is drilled into them or over by a lawnmower or car door handle. Fuse failures are usually to blame for non-remote Key repair chips failures.

If you're handy enough to open up the sealed key fob and can tolerate the mess, you can take off the circuit board and examine the fuse using a multimeter for proper diode function. If you're not 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 by a variety of factors. They may lose their connection to the car's receiver due to shock or a low battery, which requires them to be reprogrammed. A professional auto locksmith or main dealer will be able to reprogram your key fob and get it working again. If resetting or replacing your repair key fob fob fails it may be necessary to replace it.