How to Repair a Remote Key
Although most remote key fobs come with impressive battery life, they will eventually degrade. Sometimes it's as easy as changing the batteries, but sometimes there are more serious issues.
Take the remote apart and clean the buttons. Then bend them out and in. These methods could be all you need to get your key fob to work.
Battery
If the fob continues to working you can replace the CR2025 or CR2032 battery. If not, you can open the fob and check the buttons and battery terminals for any signs of looseness or broken parts. You can usually solder the buttons and terminals back in place. However, you'll need to know what type of battery is used in the fob.
If you're not sure if the battery is the problem, utilize a backup fob in order to unlock or start your vehicle. If you can then it's time to replace your primary fob. If not, a professional inspection is needed to figure out why it's not working correctly. It could be as easy as reprogramming it, or require different types of repairs. There's also automotive key repair that your car has forgotten your fob and isn't something you can fix on your own.
Case
The outer plastic enclosure of a remote is called the case. It is usually equipped with a replacement button pad. It is important to use a new case, as the original case is likely to be pretty grungy and it is vital that the circuit board is installed correctly in the case. The circuit board is the main component of the key fob. It can be tested with a standard multimeter by setting it to RF (radio frequency) mode and holding a scanner tuned to the same frequency that the key fob operates on next to it, listening for pulsing signals upon button presses.
Another thing to look at is the button contact points on the keypad. These may be loose or damaged over time. Soldering them back into place will often allow them to return to their original functionality, unless they snap completely.
Buttons
If the buttons on your key fob do not function anymore or are difficult to press you may need a dorman or motormite key housing replacement for your remote can be bought inexpensively online for the year/make/model you have. Then pop the circuit board from your old case into the new. In some cases you may have to adjust the board's position slightly. You can then use aluminum foil using double-sided tape to adhere to the black contact points on the buttons.
Programming
car key remote repair and the receiver in your car are paired however this connection could be ruined. A professional will assess the car to determine the manufacturer, year, year and model and employ specialist equipment to re-pair or program the fob with a blank transponder chip (or clone a key in the event that it is possible). They will then test the remote to confirm that it works.
When reprogramming keys that are blank it is essential to take care. The process is complicated and each manufacturer comes with distinct instructions. It is also possible to skip a step or delay too long before leaving the programming mode, which is why it is best to use professionals with extensive knowledge of your car's security system to reduce the chance of damaging the car. Certain programming tools that are essential to use can also detect diagnostic trouble codes on your vehicle. This can help you fix or resolve other issues.