How to Repair a Remote Key
While most remote key fobs have excellent battery life, they'll eventually get worn out. Sometimes it's as simple as replacing the batteries, however sometimes there are more serious issues.
An easy fix that could help is dismantling the remote by cleaning the buttons and stretching them out and in. These methods could be all that you require to get your key fob back in working order.
Battery
Car key remotes use CR2025 or CR2032 batteries, and they can often be swapped out when the fob is functioning. If not, you can examine the battery terminals or buttons to see if there are any loose parts. Often the terminals and buttons can be re-soldered back into place but you'll need know exactly what type of battery your fob uses.
If the battery isn't the problem, try using an alternate key fob to see whether you can start or unlock your vehicle using it. If you can then it's time to replace your primary fob. If not then you'll require a professional to inspect it to determine the issue. It could be as simple as reconfiguration, or it may require other types of repairs. It could also be that your vehicle has forgotten the fob. This isn't something you can do by yourself.
Case
The case of remote keys is the plastic case that surrounds it and usually comes with the button pad replacement. It is recommended to purchase a brand new case, because the one you have is likely to be very filthy. Additionally, it is essential that the circuit board within the case is placed correctly. The circuit board is the main component of the key fob. It can be tested with a standard multimeter by setting it to the RF (radio frequency) mode and then holding a radio scanner tuned to the same frequency that the key fob is using next to it, watching for pulsing signals upon pressing the button.
Check on front page of the keys on the keypad. They could be loose over time or have been damaged. Soldering them back to their original position will often allow them to return to their original functionality, unless they break completely.
Buttons
IF your key fob buttons do not function anymore or are difficult to press you may need a dorman or motormite remote key housing replacement can be purchased for a low price online for your year/make and model. Then, pop the circuit board from your old case and insert it into the new one. In remote key repairs may have to adjust the board's position slightly. The black contact points of the buttons can be bonded to aluminum foil using double-sided tape.
Programming
The key fob and receiver inside your car are linked, but this connection can be ruined. A professional will assess your vehicle to determine its make, year, and model. They will then employ specialist equipment to recouple or program the transponder chip with a blank fob (or duplicate the key, if possible). Then, remote key repairs test the remote to make sure that it works.
When reprogramming keys that are blank it is crucial to be careful. The process can be complex and each manufacturer has distinct instructions. It is easy to miss a key step or to wait too long before exiting the programming mode. To minimize the risk of damaging your vehicle, it is best to work with a professional who has extensive knowledge of the security system of your vehicle. Certain key programming tools are also capable of analyzing diagnostic trouble codes from your vehicle, which could assist in fixing or resolving any additional problems.