How to Repair a Remote Key
While most remote key fobs come with amazing battery lives, they will eventually wear out. Some times it is as simple as changing the batteries in the device, however sometimes the problem can be more serious.
Take apart the remote and clean the buttons. Then move them in and out. These steps could be all you need to get your key fob working.
vehicle key repairs remotes use CR2025 or CR2032 batteries, and they can often be replaced when the fob is functional. If it isn't then you can remove the fob and examine 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 your fob.
If you're unsure if the battery is at fault you can utilize a backup fob in order to start or unlock your car. If it's possible, it's time to replace the primary fob. If it's not then you'll require a professional to examine it to find the problem. It could be a simple reprogramming, or it could require other types of repair. There's also the possibility that your car has lost your fob that you can fix on your own.
Case
The case of remote keys is the plastic housing that covers the outside and typically comes with a button pad replacement. It is best to use a brand new case, because the one you have is likely to be very grungy. Additionally, it is crucial that the circuit board inside the case is correctly placed. The circuit board determines 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.
Another thing to check is the button contact points on the keypad. They may have become loose or broken over time. Carefully soldering them back in place can often return them to full functionality unless they snap off completely.
Buttons
IF your key fob buttons no longer work or are difficult to press you may need a dorman or motormite key housing replacement for your remote can be purchased online for a reasonable price for your year/make and model. Then pop the circuit board out of your old case into the new. For certain models it may be necessary to adjust the position of the board slightly. You can then use aluminum foil using double-sided tape to adhere to the black contact points on the buttons.
Programming
The key fob is paired with the receiver in your vehicle. This connection can become corrupted. A professional will inspect your vehicle to determine the year, make and model. They'll then use specialist equipment to reconnect or program the transponder chip with a blank fob (or duplicate the key if that is possible). They will then test the remote to confirm that it works.
It is important 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 easy to miss a key step or to wait too long to exit the programming mode. To minimize the risk of damaging your vehicle, it is best to work with an expert who has extensive knowledge of the security system of your vehicle. Certain key programming tools can also read diagnostic trouble codes in your vehicle. This will help you fix or resolve other issues.