How to Fix a Key Fob That isn't Working
If your key fob does not work, you can fix it with a few simple steps. The first step is to be sure that it's not the backup remote.
If your backup remote is unable to lock and unlock the doors of your vehicle, it is likely that the primary remote is not working. key car repair result from circuitry or battery issues.
Battery
The battery in the key fob may be worn out over time. It is quite simple to replace the battery, however it is crucial to ensure that you choose the correct type that you can refer to the owner's manual or talk to the manufacturer's dealer to find out what kind of battery you require. It is recommended to inspect the battery compartment thoroughly because dead batteries can leak harmful chemicals that can damage the remote. If replacing the batteries doesn't solve the problem it could be that there are other issues that require attention by a professional. If the buttons are damaged or stuck, for example, it may be necessary take the remote apart and rework each component. It is also possible to reprogramme the vehicle to recognize the new device.
Buttons
Key fobs may become dirty and worn out from frequent use. This is not unusual, but it can cause buttons to cease working or require a very long press to work. This can be extremely frustrating especially if you're away from home and need to start your vehicle. Even broken or damaged buttons can be fixed with a bit of time and the 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. Then, carefully remove the remote and inspect the circuit board. Check for signs of corrosion or other indications that the buttons are worn out or damaged, such as missing the conductive paint. Utilizing a Q-tip dipped in alcohol to gently clean any membrane contacts that have damaged or where conductive paint is missing. Don't rub too hard in order to damage the conductive paint and stop the button from firing when it is pressed.
Also, be sure to check the battery connector's terminals for any loose solder connections. If this is the case, connecting them back may restore functionality to the button. You can apply the same process to restore functionality to any other loose connection within the fob.
If any of the rubber buttons at the front of the keyfob aren't working or need to be pressed very hard the graphite disks at the back of the button may have worn out and require replacement. This is usually done by rubbing a pencil across the disks, which will bring the button back to working.
If none of this is useful or if the button still does not respond to a firm press It could be the case that the circuit board has gone bad. This can be fixed by a quick clean and replacing the solder, but it is best to have an extra fob on hand in the event that this method doesn't work for you.
Circuitry
If the key fob buttons are working, the circuit board inside the remote could be dirty. A thorough inspection will usually resolve this problem. Water and broken cases are the most common causes of boards that are dirty. A damaged case could let water and other debris to get into the circuit board, which can cause it to short out. Water can also eat away at pins and connectors that are small on the board called via's.
If you're able to open up your key fob, and you're not afraid of making a mess, we can take off the buttons and put new ones in their place. Also, it's worth checking the connections between the battery terminals. They can get very filthy and if they're not tight enough, the buttons might not work or even stick in their down position. Soldering the terminals and button's back in place is usually all that's needed to return a non-working key fob to working order.
Non-Remote transponder chips
The sealed non-remote chips are more durable than remote fobs, but they can be cracked if a hole is drilled into them or when a door handle for a car or lawnmower runs over them. Failures of the fuse are typically to blame for non-remote chip failures.
If you're not confident opening the key fob, you may take the circuit board off and use a multimeter to determine if the diode is operating properly. If you're not comfortable doing this, head to your local hardware store or the Oreilly's and they'll usually have an RFID frequency tester that can tell you whether the key fob is sending signals.
Programming
Key fobs aren't impervious to destruction and can be damaged by a lot of things. They may lose their connection to the receiver in your car due to shock or a low battery, which requires the reprogramming. A professional auto locksmith or main dealer will be able to reprogram your key fob and get it functioning again. If resetting or fixing your keyfob does not work it is possible to replace it.