How to Repair a Remote Key
Even though most remote key fobs boast impressive battery life, they do eventually degrade. Some times it is simple to replace the batteries in the device, however sometimes the problem can be more serious.
An easy fix that could help is dismantling the remote, cleaning the buttons and stretching them out and in. These methods could be all you need to get the key fob working.
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If the fob is still functioning it is possible to swap out the CR2025 or CR2032 battery. If not, you can inspect the battery terminals or buttons to determine if they are any parts that are loose. You can usually connect the terminals and buttons back in place. However, you'll have to know the kind of battery is being used in the fob.
If you're not sure if the battery is at fault you can make use of a backup fob to unlock or start your vehicle. If you are able to do so, it's time to replace your primary fob. If it's not, a professional inspection is needed to figure out why it's not working properly. It could be as easy as reprogramming it, or require other repairs. There's also the possibility that your vehicle lost your fob and isn't something you can fix yourself.
Case Study
The case of a remote key is the plastic housing that covers the outside and usually comes with the button pad that is replaced. It is essential to choose a new case as the original one is likely to be pretty grungy, and it is essential that the circuit board is placed correctly inside the case. The circuit board controls the key fob's function. You can test it with 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 could have become loose or broken in the course of time. Soldering them back in place can often restore them to their original functionality, except if they snap completely.
Buttons
If the buttons on your key fob do not function anymore or are difficult to press for any reason, a motormite or dorman key housing replacement for your remote can be purchased online for a reasonable price for your year/make and model. Then, simply pop the circuit board out of your old case into the new. It is possible to adjust the position of the board on some models. The black contact points of the buttons can be adhered to aluminum foil using double-sided tape.
Programming
The key fob and the receiver in your car are linked, but this connection can be corrupted. A professional will assess the car to determine the make, year and model and employ specialist equipment to re-pair or program a blank fob or transponder chip (or make a key replica if this is possible). Then they test the remote to make sure it functions.
It is important to be cautious when programming the blank key, because the process can be complicated and different manufacturers require distinct steps. It is easy to skip a step or to take too long to exit the programming mode. To reduce the chance of causing damage to your vehicle, it is best to work with an expert with extensive knowledge of the security system of your vehicle. Certain key programming tools can also identify diagnostic trouble codes in your vehicle. This can help you fix or resolve other issues.