How The 10 Worst Remote Key Repair Fails Of All Time Could Have Been Prevented
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 a few simple steps. First, make sure that it's not your backup remote.
If your backup remote is unable to lock and unlock the doors of your car, then it is likely that the main remote isn't working. The majority of car remote key malfunctions are caused by circuitry or battery problems.
Battery
It is not uncommon for the battery inside the car key fob to wear out. It is quite simple to replace batteries, but it is essential to ensure that you select the correct one that you can refer to your owner's manual, or contact the dealer of the manufacturer to determine the type of battery you require. It's also a good idea to inspect the battery compartment thoroughly since dead batteries may release caustic 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 instance, if the buttons appear stuck or damaged it could 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 may get dirty and worn. This is not unusual, but it can cause buttons to cease functioning or require a long press to function. This can be a hassle especially when you're away from home and you need to start your car. Even broken or damaged buttons can be fixed with a bit of time and materials you already have at home.
First, check that car key fob repair are properly charged and that the indentation on the back of the button is filled. Open the remote carefully and look over the circuit board. Check for signs of rust or other indications that the buttons are damaged or worn. For instance, conductive paint may 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. Do not rub too vigorously, as this could erode the conductive paint, and block the button from firing when pressed.
Also, be sure to check the battery connector's terminals to ensure any loose solder connections. Soldering them back to their original position will restore the button's functionality in the event that this is the case. The same process can be used to restore function to any loose connections within the fob.
Finally, if any of the buttons made of rubber on the front of the key fob stop functioning or require a hard press to work it is likely the graphite disks at the back of the button are wearing down and need to be replaced. This can be done by rubbing a pencil across the disks, which should bring the button back to working.
If none of this is useful, or if the button doesn't respond to a hard press It could be the case that the circuit board is damaged. This can sometimes be repaired by a quick clean and re-soldering, but it is 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 inside your remote might be dirty. The issue can be solved through a thorough examination. The most common causes of dirty circuit boards is water and damaged cases. A damaged case allows water and other debris to pass through and short circuit the electronic components. Water can also eat through pins and vias, which are small connectors on the board.
If you're able to remove your key fob, and you're not afraid of making a mess, we can remove the solder from the buttons and solder new ones in their place. It's also worth looking at the battery terminal connections. They can become very dirty and if they're loose, the buttons might not function or even stay in their down position. Soldering the terminals and buttons back in their place is generally all it takes to restore the key fob that is not working to working condition.
Non-Remote transponder chips
Sealed non-remote transponder chip are more durable than remote fobs that have them but they can still be damaged by a hole that is drilled into them or run over by a lawnmowers blade or car door handle. The majority of non-remote transponder chip failures could be attributed to blowing fuses.
If you are not comfortable opening the key fob, remove the circuitboard and utilize a multimeter to check that the diode is operating correctly. If you're not confident doing this, head to your local hardware store or Oreilly's, and they'll usually have an RF frequency tester that will let you know whether the key fob is sending a signal.
Programming
Key fobs endure many abuses and aren't completely indestructible. They can break their connection with the receiver inside your vehicle because of shocks or a low-battery, which requires changing the program. A professional auto locksmith, or the main dealer, can reprogram your keyfob to get it functioning again. If resetting or repairing the keyfob is not working, you may need to replace it.