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How to Fix a Key Fob That isn't Working

If your automotive key repair fob isn't working, a few easy steps can be taken to fix it. First, check to make sure it's not your backup remote.

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

Battery

The battery inside the key fob may be worn out over time. It is fairly easy to change out a battery, although it is essential to ensure that you use the right type; you can look in your owner's manual or contact the manufacturer's dealer to find out the kind of battery you need. It is also crucial to check the battery compartment, as dead batteries can leak toxic chemicals that could damage the remote. If changing the batteries does not solve the issue it could be because there are other issues that require professional attention. For instance, if the buttons seem stuck or damaged, it may be necessary to take the remote apart and rebuild its components. You could also try reprogramming the vehicle to recognize the new key fob.

Buttons

Key fobs can get dirty and worn out from frequent use. This is not atypical, but it can cause buttons to cease working or require a very difficult press to get them to function. This can be frustrating especially when you're away from home and have to start your car. Even broken or damaged buttons are often fixable with a bit of time and materials you already have at home.

First, ensure that the batteries are charged correctly and that the indentation on the back of the button is filled. Take the remote apart and look over the circuit board. Examine for evidence of rust, or other indications that the buttons are worn or damaged. For example the paint that conducts electricity could be missing. Use a Q-tip that has been dipped in rubbing alcohol to gently clean any membrane contact that is worn out or where conductive painting is missing. Don't rub too hard in order to damage the conductive paint and prevent the button from firing when pressed.

Examine the battery connector's terminals carefully for any loose solder connections. If this is the case, simply reconnecting them could bring back function to the button. The same process can be used to restore function to any loose connections inside the fob.

If, for instance, any of the buttons made of rubber that are on the front of the key fob aren't working or require a long press to function it is likely that the graphite disks at the back of the button are deteriorating and require replacement. You can do this by rubbing a pen across the disks. This should bring the button back to life.

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

Circuitry

Whether or not the keys fob buttons are functioning the circuit board that is inside your remote might be dirty. This issue can be fixed through a thorough examination. The most common causes for dirty circuit boards are water and damaged cases. A damaged case can allow water and other debris to pass through and short out the electronic components. Water can also eat through pins and vias, which are small connectors that are found on the board.

If you're able to open your key fob, and you don't mind making an mess, you can take the buttons out of their sockets and put in new ones. It's also worth examining the battery terminal connections. They can become extremely dirty and if they're loose, the buttons might not function or may even remain in their down position. Soldering terminals and buttons back into place is usually enough to restore a non-working fob back to working.

Non-Remote transponder chips

The sealed non-remote chips are more durable than their remote fobs, but they are susceptible to breaking when a hole is made in them or when a door handle for a car key and repair or lawnmowers is pushed over them. Failures of the fuse are typically to blame for non-remote chip failures.

If you are not comfortable opening the key fob, remove the circuitboard and utilize a multimeter to verify that the diode is functioning correctly. If you're unsure about doing this, visit your local hardware store or Oreilly's, and they will usually have an radio frequency tester that can determine whether the key fob is sending signals.

Programming

Key fobs are subject to a lot of abuse and aren't completely indestructible. They can lose their pairing to the car's receiver due to shock or low battery, which calls for them to be reprogrammed. A professional auto locksmith or dealer will be able to reprogram your key fob to get it functioning again. If, in the unlikely event that resetting and fixing your key fob doesn't work it could be the time to replace it entirely.