How to Fix a Key Fob That isn't Working
If your key fob won't work then you can fix it with some simple steps. First, ensure that it's not your backup remote.
If your backup remote is unable to unlock and lock the doors of your car, then it is likely that the main remote is not working. Most car remote key failures result from battery or circuitry problems.
Battery
It is not uncommon for the battery in a car key fob to wear out. It is easy to replace batteries. However, it is important to select the right type. You can check the owner's manual or contact the manufacturer to determine the right type. It is also a good idea to inspect the battery compartment thoroughly, as dead batteries sometimes release caustic chemicals that could harm the remote. If replacing the battery does not solve the issue there may be additional issues that require attention from a professional. If buttons are broken or stuck, for example, it may be necessary disassemble the remote and rework each component. You could also try reprogramming the vehicle to recognize the new device.
Buttons
Key fobs may become filthy and worn out due to frequent use. This is not unusual however it can cause buttons to cease functioning or require a hard press for them to work. This can be very frustrating particularly when you're away from your home and need to turn on your car. Even worn-out or malfunctioning buttons are often fixable with a little effort and tools you already have at home.
First, make sure the batteries are up correctly and that the indentation on the back of the button is filled. Take the remote apart and inspect the circuit board. Check for signs of rust or other signs the buttons are damaged or worn out. For key fob repairs near me there could be conductive paint missing. Then, using the Q-tip, dipped in alcohol, gently clean any membrane contacts that have become worn or where conductive paint is missing. Be careful not to rub too hard, since this could cause damage to the conductive painting and prevent the button from firing when pressed.
Examine the battery connector's terminals for loose solder connections. Soldering them back to their original position will restore the button's functionality If this is the case. The same process can be used to restore function to any other loose connections within the fob.
If any of the rubber buttons on the front of the keyfob isn't working or require being pressing extremely hard the graphite disks on the back of the button might have worn out and need to replaced. This can be done by rubbing a pencil across the disks, which should bring the button back to life.
If none of these solutions work, or if you still are unable to get the button to respond when you press it hard, it could be that the circuitry is failing. This can be fixed by a quick clean and re-soldering, but it is ideal to have a spare fob on hand in the event that this method does not work for you.
Circuitry
If the keys fob buttons are functioning, the circuit board inside your remote might be dirty. A thorough inspection is often enough to resolve this issue. The most common causes for dirty circuit boards are water and broken cases. A damaged case allows water and other debris to enter and short circuit the electronic components. Water can also damage pins and connectors on the board, referred to as via's.
If you're handy enough to remove your key fob and aren't afraid of making a mess, we can de-solder the buttons and put new ones in their place. It's also worth checking the battery terminal connections. If they are loose, the buttons might not work or even become stuck in their down position. Soldering the terminals and button's back in their place is generally all it takes to restore the key fob that is not working to working condition.
Non-Remote transponder chips
The non-remote chips sealed in a sealed case are more durable than their remote fobs. However, they are susceptible to cracking in the event of a hole being drilled into them or if a car door handle or lawnmowers is pushed over them. The majority of non-remote transponder chip failures can be blamed on an exploded fuse.
If you're not confident opening the key fob, you may remove the circuitboard and utilize a multimeter to verify that the diode is working correctly. If you're unsure about doing this, visit your local hardware store or Oreilly's and they will usually have an RF frequency tester that will let you know if the key fob is sending a signal.
Programming
Key fobs aren't indestructible and can be damaged through a variety of causes. They can lose their pairing with the receiver inside your vehicle because of shocks or a low-battery, which requires reprogramming. A professional auto locksmith or the main dealer can reprogram your keyfob and get it working again. If resetting or fixing the keyfob is not working it may be necessary to replace it.