How to Fix a Key Fob That isn't Working
If your key fob isn't functioning There are a few simple steps that can be taken to fix it. The first step is to make sure that it's not the backup remote.
If the backup can lock and unlock your car doors, then there's a likely issue with the primary remote. Most problems with car remote keys result from circuitry or battery problems.
Battery
It is not uncommon for the battery in a car key fob to degrade. It is simple to replace batteries. However, it is important that you choose the right kind. You can consult the owner's manual or contact the manufacturer to find out the right type. It is recommended to examine the battery compartment with care since dead batteries may release caustic chemicals that could damage the remote. If replacing the battery does not fix the issue there could be other issues requiring professional attention. If car keys repair are damaged or stuck, for example it might be necessary to take the remote apart and rework each component. You could also try reprogramming your vehicle to recognize the new key fob.
Buttons
Key fobs may become dirty and worn out from repeated use. This is not atypical, but it can cause buttons to stop functioning or require a hard press for them to work. This can be very frustrating, especially if you are away from home and you need to start your car. Fortunately, even worn-out or broken buttons can usually be fixed with just a bit of time and some of the materials you may already have around the house.
First, verify that the batteries are properly placed and that the indentation at the back of the button has been filled. Then, carefully open the remote and look at the circuit board. Look for evidence of rust, or other signs the buttons are damaged or worn out. For example, conductive paint may be missing. Utilizing a Q-tip dipped in rubbing alcohol, 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, carefully check the battery connector terminals for an unattached solder connection. Soldering them back in place can restore the button's functionality in the event that this is the situation. The same method can be used to restore function to any loose connections in the fob.
Finally, if any of the buttons made of rubber that are on the front of the key fob aren't working or require a very difficult press to function it is likely the graphite disks on the back of the button are deteriorating and need to be replaced. This is usually done by rubbing a pencil over the disks. This should bring the button back to its original state.
If none of these solutions work or you cannot get the button to respond when you press it hard, it is possible that the circuitry is failing. It is possible to fix this by cleaning and re-soldering your fob however, you should have a spare in case it doesn't work.
Circuitry
Whether or not the keys fob buttons are functioning, the circuit board inside your remote may be dirty. The issue can be solved through a thorough examination. The most common causes for dirty circuit boards is water and broken 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 the tiny connectors on the board.
If you're handy enough to open up 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 checking the connections between the battery terminals. If they are loose, the buttons might not work or even become stuck in their down position. Soldering the terminals and buttons to their proper positions is usually enough to return a malfunctioning fob to working.
Non-Remote transponder chips
The non-remote chips sealed in a sealed case are more durable than remote fobs. However, they are susceptible to breaking in the event of a hole being drilled in them or when a door handle for a car or lawnmowers plows over them. The majority of non-remote transponder chip malfunctions can be attributed to blowing fuses.
If you're able to open a key fob that is sealed and are able to bear the mess, you can take off the circuit board and test the fuse with a multimeter for proper diode function. If you're not sure with this, you can visit your local Oreilly or hardware store and use their RF frequency tester. This will inform you whether the key fob transmits signals.
Programming
Key fobs take lots of abuse and aren't indestructible. They may lose their connection with the receiver inside your vehicle due to shocks or a low battery, which calls for the reprogramming. A professional auto locksmith or main dealer will be able to reprogram your key fob to get it back up and running. If resetting or replacing the keyfob is not working it may be necessary to replace it.
