How to Fix a Key Fob That isn't Working
If your key fob doesn't work, a few easy steps can fix it. First, make sure that it's not the backup remote.
If your backup remote cannot lock and unlock the doors of your vehicle, it is likely that the primary remote isn't functioning. The most common causes for key problems with your car remote are battery or circuitry issues.
Battery
It is not unusual to find a battery on a key fob for cars to wear out. It is simple to replace the battery. However it is essential to select the right kind. You can refer to the owner's manual or contact the manufacturer to find out the right type. It is also crucial to examine the battery compartment as dead batteries can leak caustic chemicals that can harm the remote. If replacing the batteries doesn't solve the problem it could be because there are other issues that require professional attention. For instance, if the buttons seem to be stuck or damaged it could be necessary to take the remote apart and rework its components. You could also try reprogramming the vehicle to recognize the new fob.
Buttons
Key fobs may become dirty and worn out from frequent use. This is not uncommon however, it can cause buttons to stop working or require a very hard press for them to function. This can be a hassle particularly when you're away from home and you need to turn on your car. Fortunately, even worn-out or broken buttons can usually be fixed with just a bit of time and a few items you may already have around the house.
First, make sure the batteries are up correctly and that the indentation on the back of the button is filled. Then, carefully remove the remote and look at the circuit board. Examine for signs of rust or other indications that the buttons are worn or damaged, such as missing paint that is conductive. Utilizing a Q-tip dipped in alcohol to gently clean any membrane contacts that are damaged or have conductive paint missing. Do not rub too vigorously, as this could erode the conductive paint, and block the button from firing when you press it.
Examine the battery connector's terminals carefully for any loose solder connections. Soldering them back in place can restore the button's functionality in the event that this is the case. car key fob repairs near me can follow the same process to restore functionality to any other loose connection inside the fob.
If, for instance, any of the rubber buttons on the front of the key fob aren't working or require a difficult press to function, it is likely that the graphite disks on the back of the button are wearing down and require replacement. This can usually be done by rubbing a pencil across the disks. This should bring the button back to its original state.
If all of this doesn't help or if the button still does not respond to a hard press, then it may be that the circuit board has gone bad. It is possible to fix this by cleaning and re-soldering the button, but you should have an extra 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 thorough inspection is usually enough to fix this issue. The most frequent causes of dirty circuit boards is water and broken cases. A damaged case can allow water and other debris to enter and short circuit the electronic components. Water can also damage pins and vias, which are the tiny connectors found on the board.
If you're handy enough to remove your key fob and don't mind making a mess, we can de-solder the buttons and then solder new ones in their place. Also, it's worth checking the connections between the battery terminals. They can become extremely filthy and if they're not tight enough, the buttons might not function or may even remain in their down position. Soldering the terminals back to their original positions is often enough to return a malfunctioning fob back to working.
Non-Remote transponder chips
The sealed non-remote chips are more durable than remote fobs, however they are susceptible to cracking in the event of a hole being drilled into them or when a door handle for a car or lawnmowers is pushed over them. Failures of the fuse are typically to blame for non-remote chips failures.
If you're not confident opening the key fob, remove the circuitboard and utilize a multimeter to verify that the diode is functioning correctly. If you don't feel 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 damage by a lot of things. They can lose their pairing to the receiver in your car due to shock or a low battery, which requires the reprogramming. A professional auto locksmith or a main dealer will be able to reprogram your key fob to get it back up and running. In the rarer case that resetting and repairing your key fob fails it may be time to replace it entirely.