How to Fix a Key Fob That isn't Working
If your key fob doesn't work and you're not sure why, you can fix it by following some simple steps. The first step is to be sure that it's not your backup remote.
If your backup remote cannot unlock and lock the doors of your vehicle, it is likely that the main remote isn't functioning. The majority of car remote key malfunctions are caused by battery or circuitry problems.
Battery
The battery in the key fob may be worn out over time. It is easy to replace the battery. However, it is important to select the right kind. You can consult your owner's manual or call the manufacturer to determine the correct type. It's also a good idea to examine the battery compartment thoroughly because dead batteries can leak caustic chemicals that can cause damage to the remote. If changing the battery doesn't solve the issue there could be other issues that require professional attention. For example, if buttons appear stuck or broken It may be necessary to disassemble the remote and rebuild its components. It is also possible to reprogramme the vehicle to recognize the new remote.
Buttons
Key fobs can get filthy and worn out due to repeated use. It is not uncommon for buttons to cease functioning, or require a long press to get them working. This can be a huge hassle particularly if you're out of town and need to start your car. Even key fob repairs near me or worn-out buttons can be fixed with a bit of time and materials you already have at home.
First, check that the batteries are up correctly and that the indentation on the back of the button is filled. Then, carefully open the remote and examine the circuit board. Look for signs of corrosion or other indications that the buttons are worn or damaged, like missing paint that is conductive. Use a Q-tip dipped into rubbing alcohol to gently clean any membrane contact that has damaged or has conductive paint missing. Do not rub too vigorously as this can damage the conductive paint and stop the button from firing when you press it.
Check the battery connector terminals for loose solder connections. If this is the case, connecting them back can bring back function to the button. You can follow the same procedure to restore functionality to any other loose connection within the fob.
If, for instance, any of the buttons made of rubber on the front of the key fob stop working or require a difficult press to function, it is likely that the graphite disks that are on the back of the button are deteriorating and require replacement. It is usually done by rubbing a pen over the disks. This will bring the button back to life.
If none of these solutions work, or if you still cannot get the button to respond when pressed hard, it could be that the circuitry has failed. It is possible to fix this issue by cleaning and re-soldering the button however, you should have an extra in case it doesn't work.
Circuitry
Whether or not the key fob buttons are working the circuit board that is inside your remote may be dirty. This issue can be fixed by a thorough inspection. The most common causes for dirty circuit boards is water and damaged cases. A damaged case can allow water and other debris into the circuit board, causing it to short. Water can also damage pins and connectors that are small on the board, referred to as via's.
If you're able to remove your key fob, and you're not afraid of a little mess, we can take off the buttons and put new ones in their place. It's also worth examining 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 into place is typically all it takes to restore a non-working key fob to working order.
Non-Remote Transponder Chips
The non-remote chips that are sealed are more durable than remote fobs. However, they are susceptible to cracking if a hole is drilled in them, or when a door handle for a car or lawnmowers plows over them. Most of the time, non-remote transponder chip malfunctions could be attributed to blowing fuses.
If you're not comfortable opening the key fob, take the circuit board off and use a multimeter to determine if the diode is operating properly. If you're not confident doing this, go to your local hardware store or Oreilly's, and they will usually have an RF frequency tester that will determine whether the key fob sending signals.
Programming
Key fobs are subject to lots of abuse and aren't completely indestructible. They can break their connection with the receiver inside your vehicle due to shocks or low-battery, which requires the reprogramming. A professional auto locksmith, or a dealer in the main can reprogram your keyfob and get it up and running again. In the event that resetting and fixing your key fob fails it could be the time to replace it completely.