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How to Repair a Remote Key
Although most remote key fobs have excellent battery life, they'll eventually get worn out. Some times it is as simple as replacing the batteries in the device but sometimes the issue could be more serious.
Take apart the remote and clean the buttons. Then, flex car key repairs in and out. These techniques might be all you need to get the key fob to work.
Battery
If the fob continues to working you can replace the CR2025 or CR2032 battery. If not, you can look at the battery terminals and buttons to determine if they are any missing parts. The terminals and buttons can be repaired by soldering them back into place however you'll need be aware of the type of battery the fob is using.
If the battery isn't the issue, try using an alternate key fob to see whether you are able to unlock or start your car using it. If you're able to, it's probably time to replace the primary fob. If not, a professional inspection is required to determine why it's not functioning properly. It could be as simple as reset, or it could require other types of repair. There's also the possibility that your vehicle lost your fob that you can fix yourself.
Case
The case of a remote key is the plastic case that surrounds it and typically comes with a replacement button pad. It is crucial to get a new case as the original one is likely to be quite dirty, and it is essential that the circuit board is placed correctly in the case. The circuit board is responsible for the function of the key fob and can be tested with a normal 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, watching for pulsing signals upon the button's presses.
Check the contact points of the keys on the keypad. They may be loose over time or broken. Soldering them back into place can often restore them to full functionality, in the event that they snap completely.
Buttons
If your key fob buttons are no longer working or are difficult to push, you can purchase a new dorman or motormite remote key housing online for an affordable cost for the model/year/make. Then, you can take the circuit board out of your old case and into the new one. In some cases you may have to move the board slightly. The black contact points of the buttons can be bonded to with aluminum foil and double-sided tape.
Programming
The key fob is linked with the receiver in your vehicle, and this connection could be damaged. A professional will assess the car to determine the manufacturer, year of the vehicle, year of manufacture and model. They employ specialist equipment to re-pair or program a blank fob or transponder chip (or make a key replica should this be possible). Then, car key repairs test the remote to make sure that it works.
When programming blank keys it is essential to take care. The process is complicated and each manufacturer comes with slightly different instructions. It is easy to skip a step or wait too long to exit the programming mode. To avoid the risk of damaging your vehicle, it is best to employ an expert who has extensive knowledge of the security system of your vehicle. Certain key programming tools can also be capable of reading diagnostic trouble codes from your vehicle, which can assist in fixing or resolving any additional problems.