How to Fix a Key Fob That isn't Working
If your key fob won't work, you can fix it with some simple steps. First, check to make sure it's not your backup remote.
If your backup remote cannot unlock and lock the doors of your car, then it is likely that the main remote is not working. The most common causes for key problems with your car remote are circuitry or battery issues.
Battery
The battery in the key fob could be worn out over time. It is simple to replace the battery. However it is essential that you choose the right kind. You can consult your owner's manual or call the manufacturer to inquire about the correct type. It is also important to examine the battery compartment as batteries that are not working properly can release caustic chemicals that can harm the remote. If replacing the battery does not solve the issue there could be other 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 parts. repair car key can also try reprogramming your vehicle to recognize the new key fob.
Buttons
From repeated use, key fobs could get dirty and worn. It is not uncommon to have buttons stop functioning, or require a hard push to make them work. This can be extremely frustrating especially if you're away from home and you need to start your vehicle. Even worn-out or malfunctioning buttons can be fixed with a little effort and materials you already have at home.
First, make sure that the batteries are properly installed and that the indentation on the back of the button is filled. Then, carefully open up the remote and inspect the circuit board. Look for indications of rust or other indications that the buttons have been damaged or worn out. For instance the paint that conducts electricity could be missing. Then, using a Q-tip that has been dipped in alcohol to 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 painting and prevent the button from firing when the button is pressed.
Also, be sure to check the battery connector terminals for an unattached solder connection. Soldering them back in place can restore the button's functionality if this is the situation. The same method can be used to restore function to any loose connections within the fob.
In the end, if any of the rubber buttons on the front of the key fob aren't working or require a long press to function it is likely the graphite disks on the back of the button are deteriorating and need to be replaced. This is usually done by rubbing a pencil over the disks, which will bring the button back to its original state.
If none of this is helpful or if the button doesn't respond to a hard push, then it may be the case that the circuit board is damaged. This can sometimes be repaired with a quick clean and re-soldering, but it is best to have an extra fob on hand in the event that this method doesn't work for you.
Circuitry
Whether or not the key fob buttons function the circuit board in the remote could be dirty. A thorough inspection is usually enough to fix this problem. The most common causes of dirty circuit boards are water and damaged 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 called via's.
If you're handy enough to open your key fob and don't mind a little mess, we can de-solder the buttons and put new ones in their place. Also, it's worth checking the connections between battery terminals. If they are loose, the buttons could not function properly or become stuck in their down position. Soldering the terminals and button's back in their place is generally all it takes to restore a non-working key fob to working order.
Non-Remote transponder chips
Sealed non-remote transponder chips are much more durable than the remote fobs that contain them however they are still susceptible to being cracked by a hole drilled into them or run over by a lawnmower or door handle for a car. Fuse failures are usually to blame for non-remote chips failures.
If you are not comfortable opening the key fob, you may take the circuit board off and use a multimeter to verify that the diode is operating correctly. If key fob repairs about doing this, visit your local hardware store or Oreilly's and they will usually have an RFID frequency tester that can determine whether the key fob sending a signal.
Programming
Key fobs take lots of abuse and aren't completely indestructible. They may lose their connection with the receiver in your vehicle due to shocks or low-battery, which requires the reprogramming. A professional auto locksmith or dealer can reprogram your key fob to get it working again. In the event that resetting or repairing your key fob fails, it could be time to replace it all over again.