How to Fix a Key Fob That isn't Working

If your key fob does not work and you're not sure why, you can fix it with just a few steps. The first step is to be sure that it's not your backup remote.

If the backup remote is able to lock and unlock your car doors, it is most likely an issue with the primary remote. The most common causes of car remote key failure are issues with the circuitry or battery.

Battery

The battery inside the key fob could be worn out over time. It is quite simple to replace the battery, however it is crucial to ensure that you select the correct one that you can refer to your owner's manual, or contact the dealer of the manufacturer to find out what kind of battery you require. It is also a good idea to examine the battery compartment thoroughly, as dead batteries sometimes release caustic chemicals that could cause damage to the remote. If replacing the batteries doesn't solve the problem it could be that there are other issues that require attention by a professional. For instance, if the buttons appear stuck or damaged it could be necessary to disassemble the remote and rework its parts. You could also try reprogramming the vehicle to recognize the new fob.

Buttons

Due to frequent use, key fobs could get dirty and worn. It is not unusual for buttons to cease functioning, or require a long push to make them work. This can be very frustrating especially when you're away from home and you need to switch on your car. Fortunately, even worn-out or broken buttons can usually be fixed with a bit of time and a few materials you have in the home.

First, ensure that the batteries are properly charged and that the indentation on the back of the button is filled. Then, carefully remove the remote and examine the circuit board. Check for signs of rust or other signs the buttons have been worn or damaged. For example, conductive paint may be missing. Then, using the Q-tip, dipped in alcohol to gently clean any membrane contacts that are worn or have conductive paint missing. Be careful not to rub too hard, as this can erode the conductive painting and prevent the button firing when it is pressed.

Also, be sure to check the battery connector's terminals for any loose solder connections. Soldering them back to their original position will restore the button's functionality if this is the case. The same procedure can be used to restore function to any loose connections within the fob.

If any of the rubber buttons at the front of the keyfob are not working or need to be press very hard the graphite disks at the back of the button might have worn out and will require replacement. You can do this by rubbing a pencil over the disks. This should bring the button to life.

If none of this is helpful, or if the button still doesn't respond to a firm press, then it may be the case that the circuit board has gone bad. 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 doesn't work for you.

Circuitry

The circuit board in the remote control could be dirty regardless of whether the buttons on the key fob function or not. This problem can be resolved through a thorough examination. The most common causes of dirty circuit boards are water and damaged cases. A damaged case allows water and other debris to pass through and short out the electronics. Water can also eat away at pins and connectors on the board called via's.

If you're able to open up your key fob and don't mind making a mess, we can take off the buttons and put new ones in their place. Also, you should check the connections between battery terminals. They can get very dirty and if they're loose the buttons might not work or even stay in their down position. Soldering the terminals and buttons to their original positions is often enough to return a malfunctioning fob to a working condition.

Non-remote key fob repair transponder chips

The non-remote chips sealed in a sealed case are more durable than their remote fobs, however they are susceptible to breaking if a hole is drilled in them, or when a door handle for a repair car key fob repair remote; you can look here, or lawnmower runs over them. Most of the time, non-remote transponder chip failures can be blamed on blowing fuses.

If you're able to open up a sealed non-remote key fob and are able to bear the mess, you can take off the circuit board and check the fuse using an instrument to verify diode function. If you're unsure about doing this, go to your local hardware store or Oreilly's and they will usually have an radio frequency tester that can determine if the key fob is sending a signal.

Programming

Key fobs endure a lot of abuse and aren't completely indestructible. They may lose their connection to the car's receiver due to shock or a low battery, which requires the reprogramming. A professional auto locksmith or a main dealer can reprogram your key fob to get it working again. If resetting or fixing the keyfob is not working it is possible to replace it.