How to Fix a Key Fob That isn't Working
If your key fob doesn't work, a few easy steps can be taken to fix it. The first step is to be 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 functioning. The most frequent causes of key malfunctions for car remotes are battery or circuitry issues.
Battery
The battery in the key fob may get worn out over the course of time. It is easy to replace batteries. However, it is important to select the right type. You can check the owner's manual or contact the manufacturer to determine the right type. It is also essential to examine the battery compartment, since batteries that are not working properly can release toxic chemicals that could damage the remote. If replacing the batteries doesn't solve the issue it could be that there are other issues that require attention by a professional. For example, if buttons seem stuck or damaged It may be necessary to take the remote apart and rebuild its components. You could also try reprogramming your car to recognize the new key fob.
Buttons
Key fobs can get dirty and worn out from repeated use. It is not uncommon for buttons to stop working, or to require a hard press to get them working. This can be very frustrating especially if you're away from home and need to start your vehicle. Even broken or damaged buttons are often fixable with a bit of time and the tools you already have at home.
First, check that the batteries have been correctly inserted and that the indentation on the back of the button has been filled. Then, open the remote with care and inspect the circuit board. Examine for signs of rust or other signs that the buttons are worn or damaged, like missing conductive paint. 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. Be careful not to rub too hard, as this can erode the conductive paint and stop the button firing when it is pressed.
Also, be sure to check the battery connector terminals for an unattached solder connection. If this is the case, soldering them back in place can restore function to the button. The same process can be used to restore function to any loose connections within the fob.
If any of the rubber buttons on the front of the keyfob aren't working or need to be press very hard the graphite disks at the back of the button may have worn out and will require replacement. You can usually do this by rubbing a pencil 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 could be that the circuitry is failing. This can sometimes be repaired by a quick clean, and refitting, but it's recommended to have an additional fob available in the event this method does not work for you.
Circuitry
If the keys fob buttons are functioning the circuit board in your remote might be dirty. A thorough inspection will usually resolve this problem. The most frequent causes of dirty circuit boards are water and damaged cases. A broken case allows water and other debris to enter and short circuit the electronics. Water can also damage pins and connectors on the board, which are known as via's.
If ignition key repair near me to open 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 the battery terminals. If they're loose, the buttons might not work or even become stuck in their down position. Soldering the terminals, and putting the button back in their place is generally all that's needed to return keys that are not in working order.
Non-Remote transponder chips
Sealed non-remote transponder chips are much more durable than the remote fobs that contain them but they can still be damaged by a hole that is made in them or pushed over by a lawnmowers blade or car door handle. The failure of the fuse is usually to blame for non-remote chip failures.
If you're not confident opening the key fob, you may remove the circuitboard and use a multimeter to verify that the diode is working correctly. If you're not confident doing this, head to your local hardware store or the Oreilly's and they will usually have a radio frequency tester that can determine if the key fob is transmitting a signal.
Programming
Key fobs take lots of abuse and aren't impervious to damage. They can break their connection with the receiver inside your vehicle due to shocks or a low-battery, which requires the reprogramming. A professional auto locksmith or dealer will be able to reprogram your key fob to get it back up and running. If, in the unlikely event that resetting or repairing your key fob isn't working it could be the time to replace it all over again.