How to Repair a Remote Key
Even though most remote key fobs boast an impressive battery lifespan, they eventually degrade. Sometimes it's as easy as changing the batteries, however sometimes there are more serious issues.
A quick fix that can help is dismantling the remote by cleaning the buttons and stretching them out and in. These steps could be all that you require to get your key fob working again.
Battery
If the fob is functioning you can replace the CR2025 or CR2032 battery. If not, you can look at the battery terminals and buttons to determine if there are any loose parts. Often the terminals and buttons can be repaired by soldering them back into place however you'll need know exactly what type of battery your fob uses.
If the battery isn't the problem, try using an alternative key fob to see whether you can unlock or start your vehicle using it. If you're able to do so, it's probably time to replace your primary fob. If not, you will require a professional examine it to find the issue. It could be a simple reset, or it could require other types of repairs. It could also be that your vehicle has lost the fob. This is not something you can tackle on your own.
Case Study
The case of remote keys is the plastic housing that covers the outside and typically comes with a button pad that is replaced. It is crucial to get a new case as the original case is likely to be a bit shabby and it is vital that the circuit board is placed properly in the case. The circuit board is responsible for controlling the function of the key fob. You can test it by using a multimeter set to RF (radiofrequency) mode and a scanner that is tuned to the same frequency as the key fob.
Check the contact points on the keys on the keypad. They may have become loose over time, or even broken. Soldering car key immobiliser repair into place can often restore them to full functionality, in the event that they snap completely.
Buttons
If your key fob buttons aren't working anymore or are difficult to press, you can buy a new dorman or motormite remote key housing on the internet at a an affordable cost for your model/year/make. Then, simply pop the circuit board out of your old case into the new one. You may need to adjust the position of the board on some models. You can then apply aluminum foil and double-sided tape to adhere to the black contact points on the buttons.
Programming
The key fob and receiver in your car are paired however this connection could be damaged. A professional will inspect your car to determine the year, make, and model. They'll then use specialist equipment to reconnect or program an unmodified transponder chip or fob (or clone the key if possible). Then they test the remote to make sure that it works.
When reprogramming blank keys it is crucial to take care. The process can be complicated and each manufacturer offers slightly different instructions. It is easy to miss a crucial step or wait too long to exit the programming mode. To minimize the risk of damaging your car it is recommended to work with an expert with vast knowledge of the security system of your vehicle. Certain key programming tools can also identify diagnostic trouble codes on your vehicle. This will help you fix or resolve other issues.