How to Fix repair car key That isn't Working
If your key fob doesn't work, you can fix it by following a few simple steps. The first step is to make sure it's not the backup remote.
If your backup remote is unable to unlock and lock the doors of your car, it is likely that the main remote isn't working. The most common causes for car remote key failure are battery or circuitry issues.
Battery
The battery inside the key fob could wear out over time. It is quite simple to change out a battery, although it is important to ensure you choose the correct type that you can refer to your owner's manual, or contact the manufacturer's dealer to determine the type of battery you need. It's also a good idea to examine the battery compartment with care because dead batteries can leak caustic chemicals that can harm the remote. If replacing the batteries doesn't solve the issue it could be that there are other issues that require professional attention. For instance, if buttons seem stuck or damaged, it may be necessary to take the remote apart and rework its parts. You could also try reprogramming your vehicle to recognize the new key fob.
Buttons
From repeated use, key fobs could wear out and become dirty. It is not uncommon for buttons to cease functioning, or require a hefty push to make them work. This can be a huge hassle particularly if you're away from home and need to start your vehicle. Even malfunctioning or worn-out buttons are often fixable with a little time and tools you already have at home.
First, make sure the batteries are charged correctly and that the indentation on the back of the button is filled. Then, open Full Statement with care and inspect the circuit board. Look for evidence of rust, or other indications that the buttons are damaged or worn out. For instance the paint that conducts electricity could be missing. Use a Q-tip that has been dipped in rubbing alcohol to gently clean any membrane contact that has become worn out or where conductive painting is missing. Avoid rubbing too hard, because this could damage the conductive paint and stop the button from firing when it is the button is pressed.
Check the battery connector terminals carefully for any loose solder connections. If this is the case, simply reconnecting them can restore function to the button. You can follow 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 pressing extremely hard, the graphite disks at the back of the button might have worn out and will require replacement. You can do this by rubbing a pen over the disks. This will bring the button back to life.
If none of these solutions work or you are unable to get the button to respond when you press it hard, it is possible that the circuitry has failed. This can sometimes be repaired with a quick clean and refitting, but it's recommended to have an additional fob on hand in the event that this method does not work for you.
Circuitry
Whether or not the key fob buttons function the circuit board in your remote may be dirty. This issue can be fixed by a thorough inspection. The most common causes for dirty circuit boards is water and damaged cases. A damaged case can allow water and other debris to get into the circuit board, which can cause it to short. Water can also eat away at pins and small connectors on the board, which are known as via's.
If you're handy enough to remove your key fob and aren't afraid of a little mess, we can take off the buttons and put new ones in their place. Also, you should check the connections between battery terminals. They can get very dirty and if they're loose, the buttons may not work or may even remain in their down position. Soldering the terminals and buttons back in their place is generally all that's required to return the key fob that is not working to working order.
Non-Remote transponder chips
The non-remote chips sealed in a sealed case are more durable than their remote fobs, however they can be cracked when a hole is made in them, or in the event that a door handle of a car or lawnmower runs over them. The majority of non-remote transponder chips fail, and this could be attributed to a blown fuse.
If you are not comfortable opening the key fob, take the circuit board off and use a multimeter to check that the diode is working properly. If you're not comfortable with this, visit your local Oreilly or hardware store and use their RF frequency tester. This will let you know whether the key fob transmits signals.
Programming
Key fobs aren't indestructible and are susceptible to being damaged through a variety of causes. They can lose their pairing to the car's receiver due to shock or a low battery, which requires the reprogramming. A professional auto locksmith or main dealer can reprogram your keyfob and get it working again. If resetting or repairing the keyfob is not working it is possible to replace it.