How to Fix a Key Fob That isn't Working

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

If the backup is able to lock and unlock your car doors it is most likely an issue with the primary remote. Most car remote key failures result from circuitry or battery problems.

Battery

The battery in the key fob could be worn out over time. It is simple to replace the battery. However, it is important that you choose the right type. You can consult the owner's manual or contact the manufacturer to find out the right kind. It is also essential to inspect the battery compartment, as batteries that are not working properly can release caustic chemicals that can harm the remote. If changing the batteries doesn't solve the problem it could be because there are other issues that require attention from a professional. If the buttons are stuck or broken for instance it might be necessary to remove the remote and rebuild each component. You can also try reprogramming the vehicle to recognize the new fob.

Buttons

Key fobs can become filthy and worn out due to repeated use. This is not unusual however it can cause buttons to cease functioning or require a long press to work. This can be extremely frustrating, especially if you are away from home and need to start your car. Fortunately, even worn-out or malfunctioning buttons can often be fixed with a bit of time and some of the materials you may already have around the home.

First, check that the batteries are correctly installed and that the indentation on the back of the button has been filled. Then, carefully open up the remote and look at the circuit board. Examine for signs of rust or other signs that the buttons are worn out or damaged, like missing the conductive paint. Then, using a Q-tip dipped in alcohol to gently clean any membrane contacts that have worn or have conductive paint missing. Don't rub too hard as this can damage the conductive paint and prevent the button from firing when pressed.

Also, be sure to check the battery connector's terminals for any loose solder connections. If this is the case, reconnecting them may restore functionality to the button. The same process can be used to restore function to any other loose connections in the fob.

If any of the rubber buttons on the front of the keyfob aren't functioning or require to be press extremely 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 pen across the disks. This will bring the button back to life.

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

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If the key fob buttons function the circuit board in your remote may be dirty. The issue can be solved by a thorough inspection. The most frequent causes of dirty circuit boards are water and damaged cases. A damaged case could allow water and other debris to enter the circuit board, causing it to short. Water can also damage pins and connectors on the board, referred to as via's.

If you're handy enough to open your key fob and aren't afraid of a little mess, we can remove the solder from the buttons and then solder new ones in their place. It's also worth examining the battery terminal connections. They can become very dirty and if they're loose the buttons might not work or even stick in their down position. Soldering the terminals back into place is usually enough to bring a non-working fob to working.

Non-Remote transponder chips

Sealed non-remote transponder chips are more durable than remote fobs that have them however they are still susceptible to being broken by a hole being made in them or pushed over by a lawnmowers blade or car door handle. Fuse failures are usually the cause of non-remote chip failures.

If you're not comfortable opening the key fob, you may remove the circuitboard and utilize a multimeter to determine if the diode is functioning correctly. If you don't feel comfortable with this, you can go to your local Oreilly or hardware store and utilize their RF frequency tester. This will let you know whether the key fob is sending signals.

Programming

Key fobs aren't indestructible and are susceptible to being damaged by a variety of factors. They can lose their pairing with the receiver in your vehicle due to shocks or low battery, requiring changing the program. A professional auto locksmith, or the main dealer, can reprogram your keyfob and get it up and running again. In the event that resetting and fixing your key fob fails it may be time to replace it completely.