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 fix it. The first step is to make sure that it's not your backup remote.
If the backup is able to lock and unlock your car door, then there's a likely issue with the primary remote. The most common causes for key malfunctions for car remotes are battery or circuitry issues.
Battery
The battery inside a key fob can get worn out over the course of time. It is relatively easy to replace batteries, but it is important to make sure that you use the right type that you can refer to your owner's manual or contact the dealer of the manufacturer to determine the type of battery you require. It's recommended to inspect the battery compartment thoroughly, as dead batteries sometimes release caustic chemicals that could damage the remote. If changing the battery doesn't fix the issue there could be other issues requiring professional attention. For instance, if the buttons appear stuck or broken, it may be necessary to take the remote apart and rework its parts. You can also try reprogramming the vehicle to recognize the new remote.
Buttons
Due to frequent use, key fobs could become worn and dirty. It is not uncommon to have buttons stop functioning, or require a hard push to make them work. This can be a huge hassle, especially if you are away from home and you need to start your vehicle. Fortunately, even worn out or malfunctioning buttons can often be fixed with just a bit of time and a few materials you have in the home.
First, make sure the batteries are charged correctly and that the indentation on the back of the button is filled. Then, carefully remove the remote and inspect the circuit board. Examine for indications of rust or other signs the buttons are damaged or worn out. For example there could be conductive paint missing. Then, using a Q-tip dipped in alcohol to gently clean any membrane contacts that have damaged or where conductive paint is missing. Avoid rubbing too hard, because this could damage the conductive paint and block the button firing when it is pressed.
Also, make sure to inspect the battery connector's terminals to ensure any loose solder connections. If this is the case, simply connecting them back could restore functionality to the button. The same method can be used to restore function to any other loose connections within the fob.
If any of the rubber buttons located at 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 need to replaced. This is usually done by rubbing a pencil on the disks, which will 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 this by cleaning and re-soldering the button however, you should have a spare in case it does not work.
electronic key repair near me inside your remote control could be dirty, regardless of whether the buttons on the key fob function or not. A very thorough inspection is usually enough to fix this problem. The most common causes of dirty circuit boards is water and damaged cases. A damaged case could let water and other debris into the circuit board, causing it to short out. Water can also damage pins and connectors that are small on the board called via's.
If you are handy enough to open your key fob and you don't mind making an mess, you can take the buttons out of their sockets and solder in new ones. It's also worth examining the battery terminal connections. If they are loose, the buttons could not function or get stuck in their down position. Soldering the terminals and button's back in place is usually 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 their remote fobs. However, they can be cracked when a hole is made in them or if a car door handle or lawnmowers plows over them. The majority of non-remote transponder chip failures can be blamed on a blown fuse.
If you are not comfortable opening the key fob, you can remove the circuitboard and use a multimeter to determine if the diode is functioning properly. If you're not comfortable with this, visit your local Oreilly or hardware store and test their RF frequency tester. This will inform you whether the key fob transmits a signal.
Programming
Key fobs are not indestructible and are susceptible to damage through a variety of causes. They may lose their connection to the car's receiver because of shock or a low battery, which calls for the reprogramming. A professional auto locksmith or dealer will be able to reprogram your key fob and get it back up and running. In the rarer case that resetting and fixing your key fob fails, it could be time to replace it completely.