How to Repair a Remote Key
Even though most remote key fobs have impressive battery life, they do eventually wear out. Some times it is as simple as replacing the batteries in the device, but in other cases the issue could be more severe.
Remove the remote from the unit and clean the buttons. Then move them in and out. These steps could be all you need to get your key fob working.
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If the fob continues to functioning you can replace the CR2025 or CR2032 battery. If not, you can inspect the battery terminals or buttons to see if there are any parts that are loose. It is usually possible to solder the buttons and terminals back into place. However, you will need to know what kind of battery is being used in the fob.
If you're unsure if the battery is the problem then make use of a backup fob to start or unlock your vehicle. If you are able to do so, it's time to replace your primary fob. If not, you will require a professional inspect it to determine the issue. It could be a simple reprogramming, or it could require other types of repair. There's also the possibility that your vehicle lost your fob, which isn't something you can fix yourself.
Case
The case of a remote key is the outer plastic housing and typically comes with a replacement button pad. It is recommended to use a brand new case, because the one you have is likely to be very dirty. Additionally, it is essential that the circuit board in the case is properly positioned. The circuit board is the main component of the key fob and is tested using a standard multimeter by setting it to RF (radio frequency) mode and holding a radio scanner tuned to the frequency the key fob operates on next to it, listening for signals that pulsate upon the button's presses.
Examine the contact points of the keys on the keypad. They may have become loose over time or broken. Carefully soldering them back in place can often return them to full functionality unless they snap off completely.
Buttons
If your key fob buttons do not function anymore or are difficult to press, a dorman or motormite key housing replacement for your remote can be purchased online for a reasonable price for the year, make and model of your. Then, take the circuit board out of the old case and insert it into the new one. You may have to slightly adjust the position of the board on some models. 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 be corrupted. A professional will assess the vehicle to determine the make of the vehicle, year of manufacture and model. They employ specialist equipment to re-pair or program the fob with a blank transponder chip (or clone a key should this be possible). Then they will test the remote to make sure it functions.
It is crucial to be cautious when programming the blank key, because the process is often complicated and different manufacturers have distinct steps. It is also easy to skip a step or wait too long before exiting the programming mode, so it is recommended to hire a professional with comprehensive knowledge of your car's security system to minimize the risk of damaging the car. Some key programming tools also have the capability of reading diagnostic trouble codes from your vehicle, which can aid in repairing or resolving additional problems.