How to Fix a Key Fob That isn't Working
If your key fob isn't working, a few easy steps can be taken to fix it. First, ensure that it's not the backup remote.
If the backup remote is able to lock and unlock your car door, then there's a likely issue with the main remote. Most problems with car remote keys are caused by circuitry or battery problems.
Battery
The battery in the key fob may wear out over time. It is simple to replace batteries. However it is essential that you use the correct type. You can refer to your owner's guide or contact the manufacturer to inquire about the correct type. It is also important to examine the battery compartment, since batteries that are not working properly can release toxic chemicals that could damage the remote. If changing the batteries doesn't solve the problem it could be because there are other issues that require professional attention. If buttons are stuck or broken, for example, it may be necessary remove the remote and rebuild each component. You can also try reprogramming the vehicle to recognize the new remote.
Buttons
From frequent use, key fobs can wear out and become dirty. This is not uncommon, but it can cause buttons to cease working or require a hard press for them to function. This can be a hassle particularly when you're away from home and need to switch on your car. Even broken or damaged buttons are often fixable with a little time 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. Open the remote carefully and look over the circuit board. Look for signs of corrosion or other signs that the buttons are worn out or damaged, such as missing paint that is conductive. Use a Q-tip dipped in alcohol, gently clean any membrane contacts that have become worn or where conductive paint is missing. Avoid rubbing too hard, since this could cause damage to the conductive paint and stop the button from firing when it is the button is pressed.
Check the battery connector's terminals for loose solder connections. Soldering them back to their original position will restore the button's functionality in the event that this is the case. You can use the same method to restore functionality to any other loose connection within the fob.
If any of the rubber buttons located at the front of the keyfob aren't functioning or require to be press very hard, the graphite disks at the back of the button could 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 its original state.
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 has failed. It is possible to fix this issue by cleaning and re-soldering your fob however, you should have another spare in case it does not work.
Circuitry
Whether or not the key fob buttons function, the circuit board inside the remote could be dirty. A thorough examination is often enough to resolve this issue. The most common causes of dirty circuit boards is water and broken cases. A damaged case can allow water and other debris to get in and short out the electronics. Water can also damage pins and small connectors on the board, referred to as via's.
If you're handy enough to open up your key fob, and you're not afraid of some mess, we can take off the buttons and put new ones in their place. It's also worth checking the battery terminal connections. They can become very dirty and if they're loose the buttons may not work or may even remain in their down position. Soldering the terminals, and putting the button back in place is usually all that's needed to return keys that are not in working order.
Non-Remote transponder chips
Sealed non-remote transponder chip are more durable than the remote fobs that contain them but they can still be cracked by a hole that is drilled into them or over by a lawnmowers blade or door handle for a car. Fuse failures are usually the cause of non-remote chip failures.
If you're handy enough to open up a key fob that is sealed and are able to bear the mess, you can take off the circuit board and examine the fuse with an instrument to verify diode function. If you're not confident doing this, go to your local hardware store or Oreilly's and they usually have an RFID frequency tester that can determine if the key fob is sending signals.
Programming
Key fobs are not indestructible and are susceptible to being damaged by a lot of things. They may lose their connection to the receiver in your car because of shock or a low battery, which calls for them to be reprogrammed. A professional auto locksmith or a dealer in the main can reprogram the keyfob to get it up and running again. If resetting or fixing car keys repair does not work it is possible to replace it.