How to Repair a Remote Key
Although most remote key fobs come with impressive battery life, they will eventually degrade. Sometimes it's as easy as changing the batteries, however sometimes there are more serious issues.
An easy fix that could aid is to disassemble the remote, cleaning the buttons and stretching them out and in. These steps could be all 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 replaced when the fob is operational. If not, examine the battery terminals or buttons to see if there are any parts that are loose. Most of the time, the buttons and terminals can be re-soldered back into place, but you'll need to be aware of the kind of battery your fob uses.
If you're not sure if the battery is the issue Try using a backup key fob to see whether you are able to unlock or start your vehicle with it. If you can, then it's time to replace the primary fob. If it doesn't, you will require a professional assess the fob to identify the issue. It could be as simple as reset, or it could require other types repair. 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 outer plastic housing and typically comes with the button pad replacement. It is essential to choose a new case as the original will probably be pretty grungy and it is vital that the circuit board is placed properly in the case. The circuit board is responsible for the function of the key fob and is tested using a normal multimeter by setting it to the RF (radio frequency) mode and holding a scanner tuned to the same frequency the key fob operates on next to it, listening for pulsing signals when a pressing the button.
Another thing to look at is the contact points for buttons on the keypad, which may have become loose or broken over time. A careful soldering process to put them back in place will often restore them to full functionality unless they snap off completely.
Buttons
If your key fob buttons aren't working anymore or are difficult to push, you can buy an alternative dorman or Motormite remote key housing on the internet at a an affordable cost for your model/year/make. Then, take the circuit board out of your old case and insert it into the new one. In some cases you may have to adjust the board's position slightly. The black contact points of buttons can be adhered to using aluminum foil and double-sided tape.
Programming
The key fob is connected with the receiver inside your vehicle, and this connection can become corrupted. A professional will examine the car to determine the make, year and model and employ specialist equipment to re-pair or program the fob with a blank transponder chip (or clone a key in the event that it is possible). They will then test the remote to confirm that it functions.
When reprogramming keys that are blank it is essential to be careful. The process can be complicated and each manufacturer comes with distinct instructions. web page is easy to skip a step or to take too long before exiting the programming mode. To reduce the chance of damaging your vehicle, it is best to hire an expert who has extensive knowledge of the security system in your vehicle. Certain key programming tools can also be capable of reading diagnostic trouble codes from your vehicle, which could assist in fixing or resolving any further problems.