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 be taken to fix it. The first step is to be sure it's not the backup remote.
If your backup remote is unable to lock and unlock the doors of your car, it is likely that the primary remote is not working. The most frequent causes of key malfunctions for car remotes are issues with the circuitry or battery.
Battery
It is not unusual for the battery inside a key fob for cars to wear out. It is fairly easy to change out a battery, although it is crucial to make sure that you use the right type and you can consult the owner's manual or talk to the dealer of the manufacturer to find out what kind of battery you need. It is also essential 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 that require professional attention. If the buttons are broken or stuck, for example, it may be necessary take the remote apart and rework each component. You could also try reprogramming your vehicle to recognize the new key fob.
Buttons
Key fobs may become filthy and worn out due to frequent use. It is not uncommon to have buttons stop working, or to require a hefty push to make them work. This can be very frustrating particularly when you're away from home and have to start your car. Even worn-out or malfunctioning buttons can be fixed with a little time and tools you already have at home.
First, check that the batteries are properly charged and that the indentation on the back of the button is filled. Open the remote carefully and look over the circuit board. Look for auto key repair of corrosion or other indications that the buttons are worn or damaged, such as missing conductive paint. Use the Q-tip, dipped in rubbing alcohol, gently clean any membrane contacts that have damaged or where conductive paint is missing. Don't rub too hard, as this could erode the conductive paint and prevent the button from firing when pressed.
Also, make sure to inspect the battery connector terminals for an unattached solder connection. Soldering car key repair to their original position will restore the button's functionality If this is the case. You can use the same procedure to restore functionality to any other loose connection inside the fob.
If any of the rubber buttons located at the front of the keyfob isn't working or need to be pressed extremely hard, the graphite disks at the back of the button may have worn out and will require replacement. You can usually do this by rubbing a pen over the disks. This should bring the button back to life.
If all of this doesn't help, or if the button doesn't respond to a hard push, then it may be the case that the circuit board has become damaged. It is possible to fix this by cleaning and re-soldering your fob, but you should have an extra in case it doesn't work.
Circuitry
If the key fob buttons function the circuit board that is inside the remote could be dirty. This issue can be fixed through a thorough examination. The most frequent causes of dirty circuit boards are water and broken cases. A damaged case could let water and other debris to get into the circuit board, causing it to short. Water can also eat through pins and vias, which are tiny connectors on the board.
If you're able to open up your key fob, and you're not afraid of 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're loose, the buttons might not work or even become stuck in their down position. Soldering terminals and buttons back into place is usually enough to restore a non-working fob to a working condition.
Non-Remote Transponder Chips
Sealed non-remote transponder chips are much more durable than the remote fobs that contain them but they can still be cracked by a hole made in them or pushed over by a lawnmowers or door handle for a car. The failure of the fuse is usually to blame for non-remote chip failures.
If you are not comfortable opening the key fob, remove the circuitboard and utilize a multimeter to verify that the diode is operating properly. 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 is sending signals.
Programming
Key fobs are subject to lots of abuse and aren't completely indestructible. They can break their connection with the receiver inside your vehicle because of shocks or a low battery, requiring changing the program. A professional auto locksmith or a main dealer can reprogram your key fob and get it functioning again. If resetting or repairing the keyfob is not working, you may need to replace it.