How to Repair a Remote Key
Although most remote key fobs come with excellent battery life, they'll eventually get worn out. Sometimes it's as simple as changing the batteries, but occasionally there are more serious problems.
Take the remote apart and clean the buttons. Then move them in and out. These techniques may be all that you require to get your key fob back in working order.
Battery
If the fob is still working, you can swap out the CR2025 or CR2032 battery. If not, you can look at the battery terminals and buttons to determine if they are any parts that are loose. The terminals and buttons can be soldered back in place, but you'll need to be aware of the type of battery the fob is using.
If the battery isn't the problem Try using an alternative key fob to see whether you can start or unlock your vehicle using it. If you're able to do so, it's probably time to replace the primary fob. If it's not, a professional inspection is needed to figure out why it's not working correctly. It could be as easy as 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 on your own.
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The outer plastic enclosure of a remote is called the case. It typically comes with an additional button pad. It is recommended to use a brand new case, because the one you have is likely to be very grungy. It is essential that the circuit board within the case is properly positioned. The circuit board is what determines 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 check is the button contact points on the keypad, which could have become damaged or loose in the course of time. Carefully soldering them back in place can often return them to full functionality unless they break completely.
Buttons
If your key fob buttons aren't working or are difficult to press, you can buy a replacement dorman or Motormite remote key housing online for the lowest cost for the model/year/make. Then, pop the circuit board out of the old case and insert it into the new one. In some cases you may have to adjust the board's position slightly. You can then apply aluminum foil using double-sided tape to adhere it to the black contact points on the buttons.
Programming
The key fob is paired with the receiver in your vehicle, and this connection could be damaged. A professional will inspect your vehicle to determine the year, make, and model. They'll then use special equipment to reconnect or program an unmodified transponder chip or fob (or clone the key if possible). They will then test the remote to make sure that it works.
When reprogramming blank keys, it is important to take care. The process can be complex and each manufacturer has different instructions. It is also possible to miss a step or delay too long before leaving the programming mode, which is why it is recommended to work with an expert with a thorough understanding of the security system of your vehicle to reduce the chance of harming the car. Certain programming tools that are essential to use can also identify diagnostic trouble codes on your vehicle. This will help you repair or troubleshoot other issues.