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How to Fix a Key Fob That isn't Working
If your key fob does not work and you're not sure why, you can fix it with some simple steps. First, ensure that it's not your backup remote.
If your backup remote is unable to unlock and lock the doors of your car, it is likely that the primary remote isn't functioning. The most frequent causes of key problems with your car remote are circuitry or battery issues.
Battery
It is not unusual for the battery inside a car key fob to get worn out. It is simple to replace the battery. However it is essential to select the right kind. You can refer to your owner's guide or contact the manufacturer to inquire about the right type. It is also important to examine the battery compartment as batteries that are not working properly can release caustic chemicals that can harm the remote. If changing the battery doesn't fix the issue there could be other issues that require professional attention. For instance, if the buttons seem stuck or broken, it may be necessary to disassemble the remote and rework its parts. It is also possible to reprogramme the vehicle to recognize the new remote.
Buttons
Through frequent use, key fobs could get dirty and worn. It is not uncommon for buttons to stop working, or to require a long press to get them working. This can be very frustrating especially if you're away from home and need to start your vehicle. Fortunately, even worn out or damaged buttons can be fixed with a bit of time and a few items you have in the home.
First, make sure that the batteries are correctly installed and that the indentation on the back of the button is filled. Then, carefully open the remote and examine the circuit board. Check for signs of corrosion or other signs that the buttons are worn or damaged, like missing conductive paint. Use a Q-tip, dipped in rubbing alcohol to gently clean any membrane contact that is worn-out or where conductive paint is missing. Do not rub too vigorously in order to damage the conductive paint and prevent the button from firing when you press it.
Check the battery connector's terminals for loose solder connections. If this is the case, read more simply connecting them back could bring back function to the button. The same process can be used to restore function to any other loose connections within the fob.
If, for instance, any of the buttons made of rubber on the front of the key fob stop working or require a hard press to work it is likely that the graphite disks that are on the back of the button are deteriorating and need to be replaced. This can usually be done by rubbing a pencil on the disks, which will bring the button back to working.
If none of this is helpful or if car key repair shop the button still does not respond to a firm press It could be because the circuit board is damaged. It is possible to fix the issue by cleaning and re-soldering the fob, but check here you should have a spare in case it doesn't work.
Circuitry
The circuit board of the remote control could be dirty regardless of whether the buttons on the key fob function or not. This issue can be fixed through a thorough examination. Water and broken cases are the most frequent causes of dirty boards. A damaged case can allow water and other debris to get into the circuit board, causing it to short out. Water can also eat through pins and vias, which are the tiny connectors that are found on the board.
If you're handy enough to open up your key fob and aren't afraid of some mess, we can take off the buttons and put new ones in their place. It's also worth looking at the battery terminal connections. If they are loose, the buttons might not function or get stuck in their down position. Soldering terminals and buttons back to their original positions is often enough to return a malfunctioning fob to working.
Non-Remote Transponder Chips
The sealed non-remote chips are more durable than their remote fobs. However, they are susceptible to breaking if a hole is drilled into them or if a car door handle or lawnmowers is pushed over them. Fuse failures are usually to blame for non-remote chips failures.
If you're able to open up a sealed non-remote key fob and are willing to put up with the mess, you can easily remove the circuit board and examine the fuse with an instrument to verify diode function. If you don't feel comfortable with this, visit your local Oreilly or hardware store and use their RF frequency tester. This will inform you whether the key fob transmits a signal.
Programming
Key fobs aren't impervious to destruction and can be damaged by a lot of things. They may lose their connection with the receiver inside your vehicle due to shocks or low-battery, which requires the reprogramming. A professional auto locksmith or main dealer can more info reprogram the keyfob to get it working again. If, in the unlikely event that resetting and fixing your here key fob doesn't work it may be time to replace it entirely.