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how to repair car key fob to Fix a Key Fob That isn't Working

If your key fob doesn't work, you can fix it by following just a few steps. First, ensure that it's not your backup remote.

If the backup can lock and unlock your car door, then there's a likely issue with the primary remote. The most common causes of key problems with your car remote are battery or circuitry issues.

Battery

It is not unusual to find a battery on the key fob for cars to degrade. It is quite simple to change out the battery, however it is important to ensure you choose the correct type that you can refer to the owner's manual or talk to the manufacturer's dealer to find out what kind of battery you need. It is also important to examine the battery compartment, since batteries that are not working properly can release toxic chemicals that could damage the remote. If replacing the battery does not fix the issue there may be additional issues requiring professional attention. For instance, if buttons appear stuck or broken, it may be necessary to disassemble the remote and rework its components. It is also possible to reprogramme the vehicle to recognize the new remote.

Buttons

Through frequent use, key fobs may get dirty and worn. It is not common for buttons to stop functioning, or require a hefty push to make them work. This can be a huge hassle especially if you're away from home and need to start your vehicle. Fortunately, even worn out or broken key repair buttons can usually be fixed with a little time and a few items you may already have around the home.

First, make sure that the batteries have been correctly installed and that the indentation on the back of the button is filled. Then, carefully remove the remote and look at the circuit board. Look for signs of rust or other indications that the buttons are worn or damaged. For instance the paint that conducts electricity could be missing. Use a Q-tip dipped in rubbing alcohol, gently clean any membrane contacts that are worn or have conductive paint missing. Avoid rubbing too hard, because this could damage the conductive painting and prevent the button firing when pressed.

Check the battery connector's terminals for loose solder connections. Soldering them back into place will allow the button to function again in the event that this is the situation. You can use the same method to restore functionality to any other loose connection within the fob.

Finally, if any of the buttons made of rubber on the front of the key fob have stopped functioning or require a hard press to work it is likely that the graphite disks that are on the back of the button are wearing down and need to be replaced. You can do this by rubbing a pencil over the disks. This should bring the button back to life.

If none of this is useful or if the button doesn't respond to a hard push It could be because the circuit board itself has gone bad. This can be fixed by a quick clean, and refitting, but it's ideal to have a spare fob available in the event this method doesn't work for you.

Circuitry

Whether or not the keys fob buttons are functioning the circuit board in your remote might be dirty. This issue can be fixed by a thorough inspection. The most common causes of dirty circuit boards are water and broken cases. A broken case can allow water and other debris to get into the circuit board, which can cause it to short. Water can also damage pins and vias, which are tiny connectors on the board.

If you're handy enough to remove your key fob, and you're not afraid of making a mess, we can take off the buttons and put new ones in their place. Also, you should check the connections between battery terminals. If they are loose, the buttons might not work or even become stuck in their down position. Soldering the terminals and button's back into place is typically all that's needed to return keys that are not in working condition.

Non-Remote Transponder Chips

Sealed non-remote transponder chip are more durable than remote fobs that contain them but they can still be cracked by a hole drilled into them or run over by a lawnmowers or door handle for a car. Fuse failures are usually to blame for non-remote key repair chips failures.

If you're able to remove a key fob that is sealed and can tolerate the mess, you can remove the circuit board and check the fuse with an instrument to verify diode function. If you're unsure about doing this, head to your local hardware store or the Oreilly's and they'll usually have a RF frequency tester that will determine whether the key fob sending signals.

Programming

Key fobs endure a lot of abuse and aren't completely indestructible. They may lose their connection to the car key repair company's receiver due to shock or a low battery, which calls for the reprogramming. A professional auto locksmith, or main dealer, can reprogram your keyfob to get it working again. In the rarer case that resetting or repairing your key fob isn't working, it could be time to replace it entirely.