How to Repair a Remote Key
Although many remote key fobs have impressive battery life, they will eventually degrade. Sometimes it's as simple as replacing the batteries inside the device, but in other cases the issue could be more serious.
Take the remote apart and clean the buttons. Then, flex them in and out. These techniques might be all you need to get your key fob working.
Battery
Car key remotes are powered by CR2025 or CR2032 batteries and they can be swapped out when the fob is functioning. If not, you can look at the battery terminals and buttons to see if there are any parts that are loose. Often the terminals and buttons can be soldered back in place however you'll need be aware of the exact kind of battery the fob is using.
If the battery isn't the issue Try using a backup key fob and see whether you can unlock or start your car using it. If it's possible then it's time to replace the primary fob. If it's not, a professional inspection is required to determine why it's not working properly. It could be as simple as reconfiguration, or it may require other types of repairs. It could also be that your car has lost the fob. This is not something you can tackle by yourself.
Case
The case of remote keys is the plastic housing that covers the outside and usually comes with the replacement button pad. It is important to use an entirely new case since the original one is likely to be a bit shabby and it is crucial that the circuit board is set correctly in the case. The circuit board is responsible for the function of the key fob. It can be tested using a standard multimeter by setting it to the RF (radio frequency) mode and holding a radio scanner tuned to the same frequency the key fob is using next to it, listening for pulsing signals upon button presses.
Check the contact points of the keys on the keypad. They may be loose over time or have been damaged. Soldering them back in place will often allow them to return to full function, except if they break completely.
Buttons
If your key fob buttons don't work anymore or are difficult to press you may need a dorman or motormite remote key housing replacement could be purchased for a low price online for the year/make/model you have. Then, simply pop the circuit board out of your old case into the new. You may have to slightly alter the position of the circuit board for certain models. Then, you can use aluminum foil and double-sided tape to adhere to the black contact points on the buttons.
Programming
key fob repair and the receiver in your car are paired, but this connection can be damaged. A professional will examine the vehicle to determine the make model, year and model. They will employ specialist equipment to re-pair or program the fob with a blank transponder chip (or make a key replica if this is possible). Then they test the remote to make sure it functions.
When reprogramming blank keys it is essential to be careful. The process can be complex and each manufacturer has slightly different instructions. It is also easy to miss a step, or wait too long before exiting the programming mode, which is why it is recommended to work with an expert with a thorough understanding of your car's security system to reduce the chance of damaging your car. Certain programming tools that are essential to use can also read diagnostic trouble codes on your vehicle. This can help you repair or troubleshoot other issues.