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. First, ensure that it's not the backup remote.
If your backup remote is unable to unlock and lock the doors of your car, then it is likely that the main remote is not working. Most problems with car remote keys result from circuitry or battery problems.
Battery
It is not unusual to find a battery on a key fob for cars to get worn out. It is easy to replace batteries. However it is essential that you choose the right type. You can refer to the owner's manual or contact the manufacturer to inquire about the correct type. It is recommended to examine the battery compartment carefully because dead batteries can release caustic chemicals that could harm the remote. If replacing the batteries doesn't solve the problem it could be because there are other issues that require professional attention. If buttons are broken or stuck, for example, it may be necessary disassemble the remote and rework each component. You could also try reprogramming the vehicle to recognize the new fob.
Buttons
From frequent use, key fobs may get dirty and worn. It is not unusual for buttons to cease working, or to require a long push to make them work. This can be very frustrating particularly when you're away from home and need to switch on your car. Even malfunctioning or worn-out buttons can be fixed with a little effort and tools you already have at home.
First, ensure that the batteries are up correctly and that the indentation on the back of the button is filled. Open the remote carefully and inspect the circuit board. Check for indications of rust or other signs the buttons are damaged or worn out. For instance the paint that conducts electricity could be missing. Use a Q-tip dipped into rubbing alcohol to gently clean any membrane contact that has become damaged or where conductive painting is missing. Avoid rubbing too hard, as this can erode 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 into place will allow the button to function again if this is the situation. The same method can be used to restore function to any other loose connections in the fob.
If, for instance, any of the rubber buttons on the front of the key fob have stopped working or require a very long press to function it is likely that the graphite disks on the back of the button are wearing out and need to be replaced. You can do this by rubbing a pen across the disks. This should bring the button to life.
If electronic car key repair near me 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 by cleaning and re-soldering the button but you should also have another spare in case it doesn't work.
Circuitry
Whether or not the keys fob buttons are functioning, the circuit board inside your remote might be dirty. A thorough examination is usually enough to fix this problem. Broken cases and water are the most frequent causes of dirty boards. A damaged case could allow water and other debris into the circuit board, which can cause it to short. Water can also eat away at pins and connectors on the board, which are known as via's.
If you're handy enough to open up your key fob, and you're not afraid of making a mess, we can de-solder the buttons and then solder new ones in their place. It's also worth examining the battery terminal connections. If they're loose, the buttons could not function properly or become stuck in their down position. Soldering the terminals back into place is usually enough to bring a non-working fob back to working.
Non-Remote transponder chips
The non-remote chips sealed in a sealed case are more durable than remote fobs, but they can be cracked when a hole is made in them, or if a car door handle or lawnmowers plows over them. Most of the time non-remote transponder chip malfunctions can be blamed on a blown fuse.
If you're not confident opening the key fob, take the circuit board off and use a multimeter to verify that the diode is operating correctly. If you're not comfortable with this, visit your local Oreilly or hardware store and utilize their RF frequency tester. This will tell you whether the key fob transmits signals.
Programming
Key fobs are subject to lots of abuse and aren't indestructible. They can lose their pairing with the receiver inside your vehicle due to shocks or a low battery, which calls for changing the program. A professional auto locksmith or a main dealer will be able to reprogram your key fob to get it working again. In the event that resetting and repairing your key fob fails, it could be time to replace it completely.