How to Fix a Key Fob That isn't Working
If your key fob doesn't work, you can fix it by following some simple steps. First, ensure that it's not the backup remote.
If the backup is able to lock and unlock your car door, then there's a likely issue with the main remote. The majority of car remote key malfunctions are caused by circuitry or battery issues.
Battery
The battery in the key fob may be worn out over time. It is simple to replace the battery. However it is essential that you choose the right type. You can check your owner's guide or contact the manufacturer to inquire about the right kind. It's also a good idea to inspect the battery compartment carefully because dead batteries can release caustic chemicals that could cause damage to the remote. If changing the battery doesn't fix the problem, there may be other issues that require attention from a professional. If the buttons are damaged or stuck, for example it could be necessary to disassemble the remote and rework each component. You could also try reprogramming the vehicle to recognize the new remote.
Buttons
Due to repeated use, key fobs can get dirty and worn. It is not unusual for buttons to cease working, or to require a hefty push to make them work. This can be a hassle especially when you're away from home and need to start your car. Fortunately, even worn out or broken buttons can usually be fixed with a bit of time and a few materials you might already have in the house.
First, verify that the batteries are correctly installed and that the indentation on the back of the button has been filled. Open the remote carefully and examine the circuit board. Check for indications of rust or other indications that the buttons have been damaged or worn out. For instance, conductive paint may be missing. Use a Q-tip dipped in alcohol, gently clean any membrane contacts that have damaged or have conductive paint missing. Avoid rubbing too hard, because this could damage the conductive painting and prevent the button firing when it is pressed.
Also, be sure to check the battery connector's terminals for a loose solder connection. If this is the case, connecting them back could restore functionality to the button. The same method can be used to restore function to any loose connections 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 working or require a very hard press to work, it is likely that the graphite disks that are on the back of the button are deteriorating and require replacement. It is usually done by rubbing a pen over the disks. This will bring the button back to life.
If all of this doesn't help, or if the button does not respond to a hard press It could be because the circuit board itself has gone bad. This can be fixed by a quick clean and refitting, but it's ideal to have a spare fob in case this method fails for you.
Circuitry
The circuit board in your remote control could be dirty regardless of whether the buttons on the key fob work or not. This issue can be fixed through a thorough examination. The most frequent causes of dirty circuit boards are water and broken cases. A broken case allows water and other debris to get in and short circuit the electronics. Water can also eat through pins and vias, which are small connectors found on the board.
If you are handy enough to open your key fob, and you don't mind making some mess, we can remove the buttons from their sockets and solder in new ones. Also, it's worth checking the connections between the battery terminals. They can get very dirty and if they're loose the buttons might not function or even stay in their down position. Soldering the terminals and button's back in place is usually all it takes to restore keys that are not in working condition.
car key fob repairs -Remote transponder chips
Sealed non-remote transponder chip are more durable than remote fobs they are contained in, but they can still be cracked by a hole that is drilled into them or over by a lawnmowers blade or car door handle. Failures of the fuse are typically to blame for non-remote chip failures.
If you're able to open a key fob that is sealed and are willing to put up with the mess, you can remove the circuit board and examine the fuse using an instrument to verify diode function. If you're not comfortable with this, go to your local Oreilly or hardware store and test their RF frequency tester. This will let you know whether the key fob transmits a signal.
Programming
Key fobs aren't indestructible and are susceptible to being damaged by a variety of factors. They can lose their pairing with the receiver in your vehicle due to shocks or a low battery, which calls for the reprogramming. A professional auto locksmith or the main dealer can reprogram your key fob and get it back up and running again. If resetting or replacing your keyfob does not work it may be necessary to replace it.