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How to Fix a Key Fob That isn't Working

If your key fob isn't functioning, a few easy steps can be taken to fix it. The first step is to be sure it's not the backup remote.

If the backup remote key repair is able to lock and unlock your car door, then there's a likely issue with the primary remote. Most car remote mobile key repair failures are caused by circuitry or battery issues.

Battery

The battery in a key fob can wear out over time. It is fairly easy to replace batteries, but it is essential to make sure that you use the right type that you can refer to your owner's manual or contact the manufacturer's dealer to determine the type of battery you need. It's also a good idea to examine the battery compartment carefully, as dead batteries sometimes release caustic chemicals that could harm the remote. If replacing the battery does not fix the issue there could be other issues that require professional attention. If buttons are broken or stuck, for example, it may be necessary take the remote apart and rework each component. You could also try reprogramming the vehicle to recognize the new device.

Buttons

Key fobs may become filthy and worn out due to repeated use. It is not unusual for buttons to cease functioning, or require a long press to get them working. This can be very frustrating, especially if you are out of town and need to start your vehicle. Even malfunctioning or worn-out buttons are often fixable with a bit of time and the tools you already have at home.

First, make sure that the batteries have been correctly placed and that the indentation on the back of the button is filled. Then, carefully open the remote and look at the circuit board. Examine for signs of rust or other indications that the buttons are worn out or damaged, such as missing paint that is conductive. Use a Q-tip dipped in rubbing alcohol, gently clean any membrane contacts that have become worn or have conductive paint missing. Avoid rubbing too hard, as this can erode the conductive paint and block the button firing when the button is pressed.

Check the battery connector's terminals carefully for any loose solder connections. If this is the case, reconnecting them may restore functionality to the button. You can apply the same method to restore functionality to any other loose connection in the fob.

In the end, if any of the rubber buttons on the front of the key fob aren't working or require a difficult press to function it is likely that the graphite disks at the back of the button are deteriorating and require replacement. This can be done by rubbing a pencil on the disks. This should bring the button back to working.

If none of these solutions work, or if you still are unable to get the button to respond when pressed hard, it is possible that the circuitry has failed. It is possible to fix this issue by cleaning and re-soldering your fob but you should also have a spare in case it doesn't work.

Circuitry

Whether or not the key fob buttons function, the circuit board inside the remote car key repairs could be dirty. This problem can be resolved through a thorough examination. Broken and damaged cases are the most common causes of boards that are dirty. A broken case allows water and other debris to pass through and short circuit the electronic components. Water can also damage pins and vias, which are small connectors on the board.

If you're able to open your repair key fob and aren't afraid of making a mess, we can take the buttons out of their sockets and put in new ones. Also, you should check the connections between battery terminals. They can become extremely dirty and if they're loose, the buttons might not function or even stay in their down position. Soldering terminals and buttons back to their proper positions is usually enough to return a malfunctioning fob to a working condition.

Non-Remote transponder chips

Sealed non-remote transponder chips are more durable than the remote fobs that have them but they can still be broken by a hole being drilled into them or run over by a lawnmower or car door handle. Failures of the fuse are typically to blame for non-remote chips failures.

If you're not confident opening the key fob, you can take the circuit board off and use a multimeter to check that the diode is functioning properly. If you're unsure about doing this, head to your local hardware store or Oreilly's, and they will usually have a RFID frequency tester that can let you know whether the key fob is sending signals.

Programming

Key fobs aren't impervious to destruction and are susceptible to being damaged by a variety of factors. They may lose their connection to the receiver in your car due to shock or a low battery, which requires the reprogramming. A professional auto locksmith, or the main dealer can reprogram the key fob and get it back up and running again. In the rarer case that resetting or repairing your key fob isn't working it could be the time to replace it all over again.