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How to Fix a Key Fob That isn't Working

If your key fob doesn't work, you can fix it with a few simple steps. The first step is to make sure that it's not your backup remote.

If your backup remote is unable to unlock and lock the doors of your vehicle, it is likely that the main remote isn't functioning. The majority of car remote key malfunctions result from circuitry or battery problems.

Battery

The battery in a key fob can be worn out over time. It is fairly easy to replace a battery, although it is essential to make sure that you choose the correct type and you can consult your owner's manual or contact the dealer for the manufacturer to find out the kind of battery you require. It's also a good idea to inspect the battery compartment with care because dead batteries can leak harmful chemicals that can damage the remote. If changing the batteries doesn't solve the issue it could be that there are other issues that require attention from a professional. For instance, if the buttons seem to be stuck or damaged, it may be necessary to take the remote apart and rebuild its components. You can also try reprogramming the vehicle to recognize the new fob.

Buttons

Through repeated use, key fobs may wear out and become dirty. It is not uncommon for buttons to cease working, or to require a hard push to make them work. This can be very frustrating particularly when you're away from your home and you need to start your car. Fortunately, even worn out or malfunctioning buttons can often be fixed with a bit of time and a few items you may already have around the house.

First, check that the batteries are charged correctly and that the indentation on the back of the button is filled. Open the remote carefully and examine the circuit board. Examine for indications of rust or other indications that the buttons have been damaged or worn. For example, conductive paint may be missing. Utilizing a 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, as this could erode the conductive paint and car remote key fob repair prevent the button from firing when you press it.

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

Finally, if any of the buttons made of rubber that are on the front of the key fob have stopped working or require a very difficult press to function it is likely that the graphite disks that are on the back of the button are wearing down and require replacement. This is usually done by rubbing a pencil across the disks, which will bring the button back to its original state.

If none of this is helpful or if the button still does not respond to a hard press, then it may be that the circuit board itself has become damaged. It is possible to fix this by cleaning and re-soldering your fob but you should also have another spare in case it doesn't work.

Circuitry

If the key fob buttons function, the circuit board inside your remote might be dirty. A thorough inspection will usually resolve this issue. Broken cases and water are the most common causes of boards that are dirty. A damaged case allows water and other debris to get in and short out the electronics. Water can also eat away at pins and connectors on the board, referred to as via's.

If you're able to open up your key fob, and you're not afraid of making a mess, we can remove the solder from the buttons and solder new ones in their place. It's also worth looking at the battery terminal connections. They can become extremely filthy and if they're not tight enough, the buttons might not function or even stay in their down position. Soldering the terminals and buttons back in their place is generally all that's needed to return the key fob that is not working to functioning condition.

Non-Remote transponder chips

The sealed non-remote chips are more durable than remote fobs. However, they are susceptible to breaking in the event of a hole being drilled in them, or if a car remote Key fob repair door handle or lawnmowers plows over them. The majority of non-remote transponder chip malfunctions can be blamed on blowing fuses.

If you're able to remove the sealed key repair car fob and are willing to put up with the mess, you can take off the circuit board and test the fuse with an instrument to verify diode function. If you're not comfortable doing this, head to your local hardware store or the Oreilly's and they usually have a radio frequency tester that can tell you if the key fob is transmitting a signal.

Programming

Key fobs are subject to many abuses and aren't indestructible. They may lose their connection to the receiver in your car key remote repair due to shock or a low battery, requiring them to be reprogrammed. A professional auto locksmith or a dealer in the main can reprogram your keyfob and get it up and running again. In the rarer case that resetting or repairing your key fob doesn't work it could be the time to replace it completely.