How to Fix a Key Fob That isn't Working
If your key fob does not work then you can fix it with just a few steps. First, check to make sure it's not the backup remote.
If the backup can lock and unlock your car door, then there is likely an issue with the primary remote. The majority of car remote key malfunctions result from circuitry or battery problems.
Battery
The battery inside the key fob may be worn out over time. It is quite simple to replace a battery, although it is essential to ensure you choose the correct type; you can look in the owner's manual or talk to the manufacturer's dealer to find out what kind of battery you need. It is also crucial to examine the battery compartment, since batteries that are not working properly can release caustic chemicals which can damage the remote. If changing the batteries does not solve the problem it could be that there are other issues that require professional attention. For instance, if the buttons appear stuck or broken it could be necessary to disassemble the remote and rework its components. You could also try reprogramming your car to recognize the new key fob.
Buttons
Due to frequent use, key fobs could get dirty and worn. It is not uncommon for buttons to cease working, or to require a hard press to get them working. This can be frustrating especially when you're away from your home and need to start your car. Even broken or damaged buttons can be fixed with a little time and materials you already have at home.
First, check that the batteries are correctly placed and that the indentation at the back of the button is filled. Then, carefully remove the remote and look at the circuit board. Check for indications of rust or other signs the buttons have been damaged or worn. For mouse click for source there could be conductive paint missing. Utilizing the Q-tip, dipped in alcohol, gently clean any membrane contacts that are damaged or where conductive paint is missing. Avoid rubbing too hard since this could cause damage to the conductive paint and block the button from firing when it is it is pressed.
Check the battery connector terminals carefully for any loose solder connections. Soldering them back to their original position can restore the button's functionality if this is the case. You can apply the same process to restore functionality to any other loose connection within the fob.
If any of the rubber buttons located at the front of the keyfob are not working or need to be pressed extremely hard the graphite disks on the back of the button might have worn out and require replacement. This can usually be done by rubbing a pencil on 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 is possible that the circuitry has failed. It is possible to fix this by a quick clean and refitting, but it's recommended to have an additional fob on hand in the event that this method doesn't work for you.
Circuitry
If the key fob buttons function the circuit board in the remote could be dirty. This issue can be fixed through a thorough examination. Broken cases and water are the most common causes of boards that are dirty. A damaged case can allow water and other debris to enter and short out the electronics. Water can also get through pins and vias, which are the tiny connectors found on the board.
If you're skilled enough to open your key fob, and don't mind making a mess, we can take the buttons out of their sockets and put in new ones. Also, you should check the connections between the battery terminals. If they are loose, the buttons may not function properly or become stuck in their down position. Soldering the terminals back to their original positions is often enough to bring a non-working fob to working.
Non-Remote Transponder Chips
The non-remote chips that are sealed are more durable than their remote fobs. However, they can be cracked in the event of a hole being drilled in them, or in the event that a door handle of a car or lawnmowers is pushed over them. Failures of the fuse are typically the cause of non-remote chip failures.
If you're not confident opening the key fob, you can take the circuit board off and use a multimeter to determine if the diode is operating properly. If you're not confident doing this, visit your local hardware store or the Oreilly's and they'll usually have an RF frequency tester that will determine if the key fob is sending signals.
Programming
Key fobs aren't indestructible and are susceptible to being damaged by a variety of factors. They may lose their connection to the car's receiver because of shock or a low battery, which requires them to be reprogrammed. A professional auto locksmith or main dealer can reprogram your key fob to get it functioning again. If resetting or repairing your key fob fails it may be necessary to replace it.