How to Repair a Remote Key
Although most remote key fobs have impressive battery lifespan, they eventually degrade. Some times it is as simple as replacing the batteries inside the device, however sometimes the issue can be more severe.
Remove the remote from the unit and clean the buttons. Then, flex them out and in. These techniques may be all you require to get your key fob working again.
Battery
Car key remotes are powered by CR2025 or CR2032 batteries and can usually be swapped out in the event that the device is functioning. If not accessible, you can take it off the fob and check the batteries' terminals and buttons for any signs of looseness or damaged parts. Often the terminals and buttons can be soldered back in place but you'll need be aware of the exact type of battery your fob uses.
If you're unsure if the battery is at fault, utilize a backup fob in order to start or unlock your vehicle. If it's possible, it's time for a replacement of the primary fob. If it's not, a professional inspection is necessary to determine the reason it's not functioning properly. It could be as easy as reprogramming it, or require other repairs. There's also the possibility that your car has lost your fob, which isn't something you can fix yourself.
Case Study
The outer plastic enclosure of a remote is referred to as the case. It usually comes with an alternative button pad. It is best to use an entirely new case because the one you have will likely to be extremely dirty. It is crucial that the circuit board inside the case is properly positioned. The circuit board is the main component of the key fob. It can be tested with a normal multimeter by setting it to RF (radio frequency) mode and holding a scanner tuned to the same frequency that the key fob is using next to it, watching for pulsing signals upon the button's presses.
Check the contact points of the buttons on the keypad. They may have become loose over time, or even broken. A careful soldering process to put them back in their original position can usually restore them to full functionality unless they completely snap off.
Buttons
If the buttons on your key fob are no longer working or are difficult to push, you can purchase an alternative dorman or Motormite remote key housing online for the lowest cost for the model/year/make. Then pop the circuit board out of your old case into the new. remote key repair may have to slightly adjust the position of the board on some models. You can then use aluminum foil with double sided tape to adhere to the black contact points on the buttons.
Programming
The key fob and receiver in your car are connected however this connection could be ruined. A professional will assess your car to determine the year, make and model. They'll then use specialist equipment to recouple or program an unmodified transponder chip or fob (or duplicate the key if possible). They will then test the remote to ensure that it works.
When programming blank keys it is essential to be careful. The process is complex and each manufacturer has different instructions. It is also easy to miss a step, or delay too long before leaving the programming mode, which is why it is recommended to work with a professional with comprehensive knowledge of your car's security system to avoid harming the car. Some key programming tools also have the capability of analyzing diagnostic trouble codes from your vehicle, which could assist in fixing or resolving any additional issues.