How to Fix a Key Fob That isn't Working
If your key fob won't work, you can fix it with some simple steps. The first step is to be sure that it's not the backup remote.
If the backup remote is able to lock and unlock your car door, then there's a likely issue with the main remote. The most common causes of key malfunctions for car remotes are battery or circuitry issues.
Battery
The battery in the key fob may wear out over time. car remote key repair is simple to replace batteries. However it is essential that you use the correct type. You can refer to the owner's manual or contact the manufacturer to determine the correct type. It is also crucial to check the battery compartment, since batteries that are not working properly can release toxic chemicals that could damage the remote. If changing the battery doesn't solve the issue, there may be other issues that require professional attention. If the buttons are broken or stuck for instance it might be necessary to disassemble the remote and rework each component. You could also try reprogramming the vehicle to recognize the new fob.
Buttons
Due to repeated use, key fobs may get dirty and worn. This is not atypical however it can cause buttons to cease working or require a difficult press to get them to work. This can be frustrating particularly when you're away from home and have to start your car. Even malfunctioning or worn-out buttons can be fixed with a little time and the tools you already have at home.
First, ensure that the batteries are properly charged and that the indentation on the back of the button is filled. Then, carefully open up the remote and look at the circuit board. Look for signs of corrosion or other indications that the buttons are worn out or damaged, such as missing the conductive paint. Use the Q-tip, dipped in alcohol, gently clean any membrane contacts that have become damaged or where conductive paint is missing. Be careful not to rub too hard, since this could cause damage to the conductive painting and prevent the button firing when the button is pressed.
Also, carefully check the battery connector's terminals for any loose solder connections. Soldering them back into place will allow the button to function again in the event that this is the case. You can use the same procedure to restore functionality to any other loose connection in the fob.
In the end, if any of the buttons made of rubber on the front of the key fob aren't working or require a hard press to work, it is likely that the graphite disks on the back of the button are wearing down and need to be replaced. This is usually done by rubbing a pencil across the disks, which will bring the button back to working.
If all of this doesn't help, or if the button still doesn't respond to a hard push, then it may be because the circuit board has become damaged. It is possible to fix this by cleaning and re-soldering the button however, you should have another spare in case it doesn't work.
Circuitry
If the keys fob buttons are functioning the circuit board that is inside the remote could be dirty. The issue can be solved through a thorough examination. Broken and damaged cases are the most common causes of boards that are dirty. remote key fob repair damaged case allows water and other debris to enter and short circuit the electronic components. Water can also damage pins and vias, which are tiny connectors that are found on the board.
If you're handy enough to open up your key fob and aren't 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 are loose, the buttons could not function or get stuck in their down position. Soldering the terminals and buttons to their proper positions is usually enough to restore a non-working fob back to working.
Non-Remote transponder chips
Sealed non-remote transponder chip are more durable than the remote fobs that contain them but they can still be damaged by a hole that is drilled into them or run over by a lawnmower or door handle for a car. Most of the time, non-remote transponder chips fail, and this could be attributed to a blown fuse.
If you're able to open the sealed key fob and are willing to put up with the mess, you can remove the circuit board and examine the fuse with a multimeter for proper diode function. If you don't feel comfortable with this, visit your local Oreilly or hardware store and utilize their RF frequency tester. This will inform you whether the key fob sends signals.
Programming
Key fobs take lots of abuse and aren't completely indestructible. They can lose their pairing to the receiver in your car due to shock or a low battery, which calls for the reprogramming. A professional auto locksmith or dealer will be able to reprogram your key fob to get it back up and running. If resetting or fixing the keyfob is not working it may be necessary to replace it.