How to Repair a Remote Key
Even though most remote key fobs have impressive battery life, they will eventually get worn out. Sometimes it's as simple as replacing the batteries inside the device, however sometimes the issue could be more serious.
One quick fix that may aid is to disassemble the remote and cleaning the buttons before flexing them in and out. These methods could be all you require to get your key fob working again.
Battery
If the fob is still functioning it is possible to swap out the CR2025 or CR2032 battery. If not, you can examine the battery terminals or buttons to see if there are any missing parts. You should be able to solder the buttons and terminals back in place. However, you will need to know what type of battery is used in the fob.
If the battery isn't the issue, try using a backup key fob to determine if you can unlock or start your car with it. If it's possible, it's probably time to replace your primary fob. If not require replacement, you'll require a professional to inspect it to determine the problem. It could be a simple reset, or it could require other types repair. You might also discover that your vehicle has forgotten the fob. This is not something you can fix by yourself.
Case
The plastic housing that covers the outside of a remote is called the case. It typically comes with an additional button pad. It is essential to choose a new case, as the original one is likely to be quite dirty and it is crucial that the circuit board is set correctly in the case. The circuit board is what 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 radio scanner that is tuned to the same frequency as the key fob.
Another thing to examine is the contact points for buttons on the keypad. These may have become loose or broken in the course of time. Soldering them back in place will often allow them to return to their original function, except if they break completely.
Buttons
If your key fob buttons aren't working or are difficult to press, you can buy an alternative dorman or Motormite remote key housing online for the lowest cost for your model/year/make. Then, you can slide the circuit board from your old case into the new. On some models you may have to move the board slightly. Then, repair key can use aluminum foil and double-sided tape to adhere it to the black contact points on the buttons.
Programming
The key fob is connected with the receiver in your vehicle and this connection could be damaged. A professional will examine the car to determine the manufacturer, year of the vehicle, year of manufacture and model. They make use of specialist equipment to repair or program the fob with a blank transponder chip (or make a key replica if this is possible). Then they will test the remote to be sure that it works.
It is essential to be careful when reprogramming a blank key, as the process is often complicated and different brands require slightly different steps. It is also possible to miss a step, or take too long to exit the programming mode, so it is recommended to work with a professional with comprehensive knowledge of your car's security system to minimize the risk of damaging your car. Certain key programming tools can also detect diagnostic trouble codes in your vehicle. This will help you fix or resolve other issues.