How to fix my fob

The key fob does two things quite separately. It open and closes the doors. It also provides the correct security credentials to the vehicle immobilizer. At first is sounded like whomever programmed it only did half the job. It may also be that the internal battery is low. It is a complex error with the vehicle computer systems on a key fob with unknown history and issues.

https://www.google.com/search?q=auto+electrician+near+me

Or go into a place that does car alarms and radios. They will have the necessary test equipment and scan tool computers.
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limited info generic answer check and test battery -- most likely the key fob itself is failing you can have some one test fob or get another fob[s] and have programmed

I have a few tips you can try to fix your Toyota Matrix key fob.

Change the battery
Batteries don't last forever, you'll be surprised how often it's just a dead battery! Search YouTube channel on how to change a battery for your specific year, make, and model!

Wipe the board
The board inside your remote can get a lot more filthy than you think! When the board is dirty it can prohibit the contact to the circuit board when you push down on the button. Simply wiping the circuit board off can make your key fob like new again!
Get it checked
Go to your local hardware store like AutoZone or Oreilly's . They usually have a RF frequency tester. This little gadget will let you know if your key fob is sending a signal. If it is, you may need to reprogram your key fob to your vehicle

The old car battery reset trick
I know this sounds absurd, but it works sometimes and is worth trying. If you exhausted all of the options above, disconnect both terminals on your car battery for 10 minutes. Then reconnect them and try your key fob. This has worked for many people and I have no idea why. If you do, please comment below to explain.

New fob!
It might be time for a new key fob! No need to dread over the expensive costs of a new key fob, at Keyless Entry Remote Fob Inc., you can get a refurbished one for a very affordable price! You won't even be able to tell the difference. Just search your vehicle make, model, and year to purchase a key fob or give us a call at 402-671-5100.

key fobs have to be programmed to the immobiliser in the car. Take it and the car to a service dealer and have it programmed properly.

where are you, your key, in kitchen, standing near car, or in car or key inserted in the ignition, I will answer , IN KITCHEN.
the operators guide, lost>? it might the first clue.
http://justgivemethedamnmanual.com/hyundai/hyundai-tiburon-owners-manual/
the fob has a light. ok , Factory Fob, or aftermarket?

the car came with 2 fobs, new, so do both fail or act odd like this.
id bet not.
and the fob has and LED lamp , if it sticks on , that means'
the FOB is no good, the switches are stuck, ON.
time to buy a new FOB or get McGiver fix yours at x2 new cost.
you can also replace the battery and how that fixes it and or clean
the insides, of fob. at same time
page 1.5 above covers the fob.

the lamp flashes when the button is pressed.
so the button is stuck,, broken./

go to a dealer and reset your key in the motor management and it wil work again

pop open the key fob from the side and you will notice a watch battery inside the fob, replace it and make sure nothing came unsoldered from the board and that should fix the problem

The key fobs stop working because the solder joints that hold the battery in place break free. Very easy to fix with a little solder and a soldering iron. I just fixed a bunch of them for people I know including BOTH of the fobs for our 2006 GP GT. Takes about 5 minutes each.

charge car battery and check battery in your fob/remote if battery in fob is weak it will not work properly