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 the backup remote is able to lock and unlock your car doors then there is likely an issue with the main remote. The most frequent causes of key problems with your car remote are issues with the circuitry or battery.
Battery
It is not uncommon for the battery in the car key fob to get worn out. It is relatively easy to change out the battery, however it is important to ensure that you choose the correct type; you can look in your owner's manual or contact the dealer for the manufacturer to find out the kind of battery you need. It is also essential to check the battery compartment, since batteries that are not working properly can release toxic chemicals that could damage the remote. If replacing the batteries doesn't solve the problem it could be because there are other issues that require professional attention. For example, if buttons appear stuck or damaged it could be necessary to disassemble the remote and rebuild its components. You can also try reprogramming the vehicle to recognize the new remote.
Buttons
Due to frequent use, key fobs could get dirty and worn. It is not uncommon to have buttons stop working, or to require a hard press to get them working. This can be a hassle particularly when you're away from home and need to switch on your car. Even malfunctioning or worn-out buttons are often fixable with a bit of time and tools you already have at home.
First, ensure that the batteries are charged correctly and that the indentation on the back of the button is filled. key fob repair service and examine the circuit board. Check for signs of rust or other signs the buttons have been damaged or worn out. For instance there could be conductive paint missing. Utilizing a Q-tip that has been dipped in alcohol, gently clean any membrane contacts that are damaged or have conductive paint missing. Do not rub too vigorously as this can damage the conductive paint, and block the button from firing when it is pressed.
Examine the battery connector's terminals carefully for any loose solder connections. If this is the case, simply connecting them back may restore functionality to the button. You can use the same process to restore functionality to any other loose connection within the fob.
In the end, if any of the buttons made of rubber that are on the front of the key fob aren't functioning or require a long press to function it is likely that the graphite disks at the back of the button are deteriorating and need to be replaced. You can usually do this by rubbing a pen across the disks. This will bring the button back to life.
If none of this is useful or if the button still doesn't respond to a hard press, then it may be because the circuit board itself has become damaged. It is possible to fix this by a quick clean and refitting, but it's recommended to have an additional fob available in the event this method does not work for you.
Circuitry
If the key fob buttons are working the circuit board that is inside your remote may be dirty. This problem can be resolved by a thorough inspection. Broken and damaged cases are the most common causes of dirty boards. A damaged case could allow water and other debris to get into the circuit board, which can cause it to short out. Water can also get through pins and vias, which are tiny connectors found on the board.
If you are handy enough to open your key fob and don't mind making an mess, you can take the buttons out of their sockets and solder in new ones. It's also worth examining the battery terminal connections. 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 it takes to restore keys that are not in working order.
Non-Remote Transponder Chips
Sealed non-remote transponder chips are more durable than remote fobs they are contained in, but they can still be cracked by a hole drilled into them or run over by a lawnmower or car door handle. Fuse failures are usually to blame for non-remote chip failures.
If you're handy enough to remove a sealed non-remote key fob and can tolerate the mess, you can easily remove the circuit board and test the fuse using an instrument to verify diode function. If you're not confident doing this, go to your local hardware store or Oreilly's and they will usually have a RF frequency tester that will tell you whether the key fob sending signals.
Programming
Key fobs take a lot of abuse and aren't completely indestructible. They can lose their pairing with the receiver inside your vehicle because of shocks or a low-battery, which requires the reprogramming. A professional auto locksmith or main dealer can reprogram your key fob to get it working again. If resetting or fixing your keyfob does not work, you may need to replace it.