How to Fix a Key Fob That isn't Working

If your key fob won't work, you can fix it with just a few steps. First, check to make sure it's not the backup remote.

If your backup remote is unable to unlock and lock the doors of your car key button repair, it is likely that the main remote is not working. The most frequent causes of car remote key failure are issues with the circuitry or battery.

Battery

The battery in the key fob may wear out over time. It is simple to replace a battery. However it is essential that you choose the right kind. You can check your owner's manual or call the manufacturer to inquire about the right kind. It is also essential to check the battery compartment as dead batteries can leak caustic chemicals which can damage the remote. If changing the battery doesn't fix the problem there may be additional issues requiring professional attention. If the buttons are stuck or broken for instance, it may be necessary disassemble the remote and rework each component. You can also try reprogramming the vehicle to recognize the new fob.

Buttons

Key fobs can get dirty and worn out from repeated use. This is not unusual however, it can cause buttons to stop functioning or require a difficult press to get them to work. This can be very frustrating particularly if you're away from home and you need to start your car. Even malfunctioning or worn-out buttons are often fixable with a little time and tools you already have at home.

First, make sure the batteries are charged correctly and that the indentation on the back of the button is filled. Then, open the remote with care and inspect the circuit board. Check for signs of corrosion or other signs that buttons are worn out or damaged, like missing paint that is conductive. Use a Q-tip that has been dipped in alcohol, gently clean any membrane contacts that have damaged or have conductive paint missing. Don't rub too hard in order to damage the conductive paint and prevent the button from firing when pressed.

Check the battery connector terminals for loose solder connections. Soldering them back into place will restore the button's functionality in the event that this is the situation. The same process can be used to restore function to any loose connections within the fob.

In the end, if any of the rubber buttons on the front of the key fob stop working or require a very difficult press to function, it is likely that the graphite disks on the back of the button are deteriorating and require replacement. You can usually do this by rubbing a pen over the disks. This will bring the button back to life.

If none of these solutions work or you not be able to get the button respond when you press it hard, it could be that the circuitry has failed. It is possible to fix this by a quick clean and re-soldering, but it is ideal to have a spare fob on hand in the event that this method doesn't work for you.

Circuitry

The circuit board of your remote control may be dirty, regardless of whether the buttons on the key fob function or not. A thorough examination is often enough to resolve this issue. The most common causes of dirty circuit boards is water and broken cases. A broken case allows water and other debris to enter and short circuit the electronics. Water can also get through pins and vias, which are small connectors on the board.

If you're handy enough to open your key fob and aren't afraid of some mess, we can take off the buttons and then solder new ones in their place. Also, you should check the connections between battery terminals. They can become extremely dirty and if they're loose the buttons might not work or even stay in their down position. Soldering terminals and buttons back to their proper positions is usually enough to return a malfunctioning fob to a working condition.

Non-Remote Transponder Chips

The sealed non-remote chips are more durable than remote fobs, but they are susceptible to cracking if a hole is drilled in them, or if a car door handle or lawnmower runs over them. Failures of the fuse are typically to blame for non-remote chip failures.

If you're not comfortable opening the key fob, remove the circuitboard and broken use a multimeter to verify that the diode is functioning correctly. If you don't feel comfortable with this, you can go to your local Oreilly or hardware store and use their RF frequency tester. This will let you know whether the key fob transmits an RF signal.

Programming

Key fobs aren't impervious to destruction and are susceptible to being damaged by a variety of factors. They can lose their pairing to the car's receiver due to shock or low battery, which requires the reprogramming. A professional auto locksmith or main dealer can reprogram your key fob to get it working again. In the event that resetting or repairing your key fob doesn't work, it could be time to replace it entirely.