How to Fix a Key Fob That isn't Working
If your key fob does not work then you can fix it by following some simple steps. remote key fob repair is to make sure that it's not the backup remote.
If the backup is able to lock and unlock your car doors, it is most likely an issue with the main remote. Most problems with car remote keys result from circuitry or battery issues.
Battery
The battery in a key fob can be worn out over time. It is simple to replace batteries. However, it is important that you use the correct type. You can refer to the owner's manual or contact the manufacturer to inquire about the right type. It is also crucial to inspect the battery compartment, as batteries that are not working properly can release caustic chemicals which can damage the remote. If changing the battery doesn't solve the issue there may be additional issues that require professional attention. For instance, if the buttons appear stuck or damaged It may be necessary to disassemble the remote and rework its parts. You could also try reprogramming the vehicle to recognize the new remote.
Buttons
From frequent use, key fobs could get dirty and worn. It is not unusual to have buttons stop working, or to require a long push to make them work. This can be extremely frustrating, especially if you are out of town and need to start your vehicle. Fortunately, even worn out or car key fob repair can often be fixed with a bit of time and a few items you may already have around the home.
First, check that the batteries are correctly inserted and that the indentation at the back of the button has been filled. Then, carefully open up the remote and inspect the circuit board. Check for signs of rust or other indications that the buttons have been worn or damaged. For example the paint that conducts electricity could be missing. Use a Q-tip, dipped in rubbing alcohol to gently clean any membrane contact that has worn-out or where conductive painting is missing. Be careful not to rub too hard, since this could cause damage to the conductive paint and block the button firing when pressed.
Examine the battery connector's terminals for loose solder connections. If this is the case, reconnecting them may restore functionality to the button. You can follow the same procedure to restore functionality to any other loose connection within the fob.
Finally, if any of the rubber buttons on the front of the key fob have stopped functioning or require a hard press to work it is likely the graphite disks at the back of the button are wearing out and need to be replaced. This can usually be done by rubbing a pencil across the disks, which should bring the button back to life.
If none of these solutions work or you are unable to get the button to respond when you press it hard, it could be that the circuitry has failed. This can be fixed with a quick clean and refitting, but it's best to have an extra fob in case this method fails for you.
Circuitry
The circuit board of your remote control may be dirty, regardless of whether the buttons on the key fob work or not. This problem can be resolved by a thorough inspection. The most common causes of dirty circuit boards is water and damaged cases. A broken case can allow water and other debris to enter the circuit board, which can cause it to short. Water can also damage pins and small connectors on the board, referred to as via's.
If you're able to open your key fob and you don't mind making an mess, you can remove the buttons from their sockets and put in new ones. Also, it's worth checking the connections between battery terminals. If they're loose, the buttons may not function properly or become stuck in their down position. Soldering the terminals, and putting the button back in their place is generally all that's required to return the key fob that is not working to functioning condition.
Non-Remote transponder chips
The sealed non-remote chips are more durable than remote fobs, however they are susceptible to breaking when a hole is made into them or in the event that a door handle of a car or lawnmower runs over them. Most of the time, non-remote transponder chips fail, and this can be blamed on an exploded fuse.
If you're not confident opening the key fob, you may take the circuit board off and use a multimeter to verify that the diode is working properly. If you're not confident doing this, go to your local hardware store or Oreilly's and they usually have a radio frequency tester that can let you know if the key fob is sending signals.
Programming
Key fobs are not indestructible and are susceptible to being damaged by a variety of factors. They can break their connection with the receiver inside your vehicle due to shocks or a low-battery, which requires reprogramming. A professional auto locksmith or main dealer can reprogram your key fob and get it working again. If resetting or repairing the keyfob is not working, you may need to replace it.