How to Repair a Remote Key
Although most remote key fobs boast impressive battery lifespan, they eventually degrade. Sometimes it's as simple as changing the batteries, but occasionally there are more serious issues.
One quick fix that may aid is to disassemble the remote by cleaning the buttons and flexing them in and out. These steps could be all you require to get your key fob back in working order.
Battery
If the fob continues to working it is possible to swap out the CR2025 or CR2032 battery. If it isn't, you can open the fob and check the batteries' terminals and buttons for any signs of looseness or broken parts. You should be able to solder the buttons and terminals back into place. However, you'll be required to know which type of battery is installed in the fob.
If you're unsure if the battery is the problem you can use a backup fob to unlock or start your car. If you can do so, it's probably time to replace your primary fob. If it doesn't, you will require a professional examine it to find the problem. It could be a simple reset, or it could require other types of repairs. There's also the possibility that your vehicle has lost your fob and isn't something you can fix on your own.
Case
The outer plastic housing of a remote is known as the case. car key and repair is usually equipped with an alternative button pad. It is recommended to use an entirely new case since the original one case is likely to be quite dirty. It is vital that the circuit board in the case is placed correctly. The circuit board is what is responsible for controlling the function of the key fob. You can test it using an instrument set to RF (radiofrequency) mode and a scanner that is tuned to the same frequency as the key fob.
Check the contact points of the buttons on the keypad. They may be loose over time, or even broken. Carefully soldering them back in place can often return them to full functionality unless they break completely.
Buttons
If the buttons on your key fob aren't working or are difficult to push, you can buy a replacement dorman or Motormite remote key housing online at the lowest price for your model/year/make. Then, pop the circuit board out of your old case and into the new one. You may need to adjust the position of the circuit board for certain models. The black contact points of the buttons can be adhered to aluminum foil using double-sided tape.
Programming
The key fob is paired with the receiver of your vehicle, and this connection can be corrupted. A professional will assess your car to determine its year, make, and model. They will then use special equipment to reconnect or program the transponder chip with a blank fob (or copy the key, if possible). They will then test the remote to confirm that it works.
It is essential to be careful when reprogramming the blank key, because the process can be a bit complicated and different manufacturers require slightly different steps. It is also possible to miss a step, or wait too long before exiting the programming mode, therefore it is best to use professionals with extensive knowledge of the security system of your vehicle to avoid damaging the car. Some key programming tools can also be capable of analyzing diagnostic trouble codes from your vehicle, which could assist in fixing or resolving any further problems.