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 make sure it's not the backup remote.

If your backup remote can unlock and lock the doors of your vehicle, it is most likely that the primary remote isn't working. The most common causes of key problems with your car remote are circuitry or battery issues.

Battery

The battery inside a key fob can be worn out over time. It is relatively easy to replace the battery, however it is important to make sure that you select the correct one and you can consult your owner's manual or contact the manufacturer's dealer to find out the kind of battery you require. It is also a good idea to inspect the battery compartment carefully since dead batteries may release caustic chemicals that could damage the remote. If changing the battery doesn't fix the problem there may be additional issues that require professional attention. If the buttons are broken or stuck for instance it could be necessary to remove the remote and rebuild each component. You can also try reprogramming the vehicle to recognize the new remote.

Buttons

Key fobs can become filthy and worn out due to frequent use. This is not uncommon however it can cause buttons to stop functioning or require a difficult press to get them to function. This can be a huge hassle especially if you're away from home and need to start your car. Even broken or damaged buttons are often fixable with a bit of time and the tools you already have at home.

First, make sure 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. Look for evidence of rust, or other indications that the buttons have been worn or damaged. For example the paint that conducts electricity could be missing. Use a Q-tip dipped into alcohol to gently clean any membrane contact that has worn-out or where conductive paint is missing. Avoid rubbing too hard as this can erode the conductive painting and prevent the button firing when pressed.

Examine the battery connector's terminals carefully for any loose solder connections. Soldering them back in place can restore the button's functionality If this is the situation. You can use the same procedure to restore functionality to any other loose connection inside the fob.

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

If Web Site of these solutions work, or if you still cannot get the button to respond when pressed hard, it is possible that the circuitry has failed. It is possible to fix this by cleaning and re-soldering the button, but you should have a spare in case it doesn't work.

Circuitry

If the key fob buttons function, the circuit board inside your remote might be dirty. The issue can be solved through a thorough examination. Water and broken cases are the most common causes of boards that are dirty. A damaged case can allow water and other debris into the circuit board, which can cause it to short. Water can also get through pins and vias, which are tiny connectors on the board.

If you're able to open your key fob and aren't afraid of making an mess, you can take the buttons out of their sockets and then solder new ones. It's also worth looking at the battery terminal connections. If they are loose, the buttons may not function or get stuck in their down position. Soldering the terminals and buttons back in place is usually all that's required to return keys that are not in working condition.

Non-Remote transponder chips

The sealed non-remote chips are more durable than their remote fobs. However, they are susceptible to cracking if a hole is drilled in them or in the event that a door handle of a car or lawnmowers plows over them. Most of the time non-remote transponder chips fail, and this could be attributed to an exploded fuse.

If you're handy enough to remove the sealed key fob and are willing to put up with the mess, you can remove the circuit board and examine the fuse using an instrument to verify diode function. If you don't feel comfortable with this, you can go to your local Oreilly or hardware store and test their RF frequency tester. This will let you know whether the key fob is sending an RF signal.

Programming

Key fobs aren't impervious to destruction and are susceptible to damage by a lot of things. They can break their connection with the receiver inside your vehicle due to shocks or low-battery, which requires reprogramming. A professional auto locksmith, or a dealer in the main, can reprogram your keyfob and get it working again. If, in the unlikely event that resetting or repairing your key fob doesn't work it could be the time to replace it all over again.
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