A Sage Piece Of Advice On Remote Key Repair From An Older FiveYearOld

How to Fix repair car key That isn't Working
If your key fob doesn't work There are a few simple steps that can be taken to fix it. repair car key is to be sure that it's not your backup remote.
If the backup remote is able to lock and unlock your car door, then there's a likely issue with the primary remote. The most common causes for key malfunctions for car remotes are 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 important to ensure that you use the right type and you can consult your owner's manual or contact the dealer of the manufacturer to determine the type of battery you require. It is recommended to examine the battery compartment thoroughly, as dead batteries sometimes leak harmful chemicals that can cause damage to the remote. If replacing the battery does not fix the problem, there may be other issues that require attention from a professional. For instance, if the buttons seem to be stuck or broken it could be necessary to take the remote apart and rework its components. You can also try reprogramming the vehicle to recognize the new key fob.
Buttons
Key fobs can become filthy and worn out due to repeated use. This is not unusual, but it can cause buttons to cease working or require a long press to work. This can be extremely frustrating, especially if you are away from home and you need to start your car. Fortunately, even worn-out or broken buttons can usually be fixed with a little time and some of the materials you may already have around the home.
First, make sure that the batteries have been correctly placed and that the indentation at the back of the button has been filled. Then, carefully open the remote and look at the circuit board. Look for signs of corrosion or other signs that the buttons are worn or damaged, like missing paint that is conductive. Use a Q-tip dipped in rubbing alcohol, gently clean any membrane contacts that have damaged or have conductive paint missing. Avoid rubbing too hard, as this can erode 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, soldering them back in place can restore functionality to the button. The same method can be used to restore function to any loose connections inside the fob.
If, for instance, any of the buttons made of rubber on the front of the key fob have stopped working or require a hard press to work it is likely the graphite disks that are on the back of the button are wearing down and need to be replaced. You can do this by rubbing a pen across the disks. This should bring the button to life.
If none of these solutions work, or if you still cannot get the button to respond when pressed hard, it could be that the circuitry is failing. It is possible to fix this by cleaning and re-soldering the button however, you should have a spare in case it doesn't work.
Circuitry
If the key fob buttons are working the circuit board that is inside your remote might be dirty. A very thorough inspection is usually enough to fix this issue. Broken cases and water are the most frequent 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 through pins and vias, which are small connectors that are found on the board.
If you're able to remove your key fob, and you're not afraid of a little mess, we can de-solder the buttons and solder new ones in their place. Also, it's worth checking the connections between battery terminals. If they are loose, the buttons might not function or get stuck in their down position. Soldering the terminals back to their proper positions is usually enough to bring a non-working fob back to working.
Non-Remote Transponder Chips
Sealed non-remote transponder chip are more durable than remote fobs they are contained in, but they can be cracked by a hole that is drilled into them or over by a lawnmower or car door handle. Failures of the fuse are typically to blame for non-remote chips failures.
If you are not comfortable opening the key fob, take the circuit board off and use a multimeter to check that the diode is operating properly. If you don't feel comfortable with this, visit your local Oreilly or hardware store and utilize their RF frequency tester. This will tell you whether the key fob sends an RF signal.
Programming
Key fobs endure a lot of abuse and aren't completely indestructible. They may lose their connection to the receiver in your car due to shock or a low battery, which calls for them to be reprogrammed. A professional auto locksmith, or the main dealer can reprogram the key fob and get it back working again. In the rarer case that resetting or repairing your key fob fails, it could be time to replace it completely.