How to Fix a Key Fob That isn't Working
If your key fob does not work, you can fix it by following a few simple steps. The first step is to make sure that it's not your backup remote.
If your backup remote can lock and unlock the doors of your vehicle, it is most likely that the primary remote is not working. The majority of car remote key malfunctions are caused by battery or circuitry problems.
Battery
The battery inside the key fob could wear out over time. It is relatively easy to replace batteries, but it is crucial to ensure that you use the right type and you can consult your owner's manual, or contact the dealer for the manufacturer to find out what kind of battery you need. It's recommended to examine the battery compartment thoroughly because dead batteries can release caustic chemicals that could cause damage to the remote. If replacing the battery does not fix the problem there may be additional issues requiring professional attention. For example, if buttons seem to be stuck or damaged, it may be necessary to disassemble the remote and rework its components. You could also try reprogramming your car to recognize the new key fob.
Buttons
Key fobs can get dirty and worn-out from repeated use. This is not atypical however, it can cause buttons to cease working or require a long press to function. This can be a huge hassle particularly if you're out of town and need to start your car. Even malfunctioning or worn-out buttons are often fixable with a little time and tools you already have at home.
First, verify that the batteries have been correctly installed and that the indentation on the back of the button is filled. Then, carefully open the remote and look at the circuit board. Look for signs of corrosion or other signs that the buttons are worn out or damaged, like missing conductive paint. Then, using the Q-tip, dipped in alcohol, gently clean any membrane contacts that have damaged or where conductive paint is missing. Avoid rubbing too hard, as this can erode the conductive paint and stop the button from firing when it is pressed.
Also, make sure to inspect the battery connector terminals for a loose solder connection. If this is the case, soldering them back in place could restore function to the button. You can apply the same procedure to restore functionality to any other loose connection inside the fob.
In the end, if any of the buttons made of rubber on the front of the key fob stop functioning or require a difficult press to function, it is likely that the graphite disks on the back of the button are wearing down and require replacement. It is usually done by rubbing a pen over the disks. This should bring the button back to life.
If none of these solutions work or you not be able to get the button respond when pressed hard, it could be that the circuitry is failing. It is possible to fix the issue by cleaning and re-soldering the button but you should also have an extra in case it doesn't work.
Circuitry
The circuit board of the remote control could be dirty regardless of whether the buttons on the key fob are working or not. The issue can be solved by a thorough inspection. The most common causes for dirty circuit boards are water and damaged cases. broken car key repair broken case allows water and other debris to get in and short out the electronic components. Water can also damage pins and vias, which are small connectors that are found on the board.
If you're skilled enough to open your key fob, and aren't afraid of making a mess, we can take the buttons out of their sockets and solder in new ones. It's also worth looking at the battery terminal connections. They can become very dirty and if they're loose the buttons might not function or even stick in their down position. Soldering the terminals and button's back in their place is generally all it takes to restore keys that are not in working order.
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 when a hole is made in them or in the event that a door handle of a car or lawnmowers plows over them. Failures of the fuse are typically to blame for non-remote chips failures.
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 not confident doing this, visit your local hardware store or Oreilly's, and they'll usually have an RFID frequency tester that can tell you if the key fob is sending a signal.
Programming
Key fobs are subject to many abuses and aren't completely indestructible. They can break their connection with the receiver inside your vehicle due to shocks or low-battery, which requires reprogramming. A professional auto locksmith or dealer will be able to reprogram your key fob and get it functioning again. If resetting or fixing the keyfob is not working it is possible to replace it.