Key Quit Working! How To Fix A Remote? Need Help!

[Gear]

Hi everyone,

Just got my 04 GX470

And for the first three days, the remote key for the door was not working, I figured should be the battery run flat.

So I went to the radioshock and changed the battery, it was still not working, so I guessed it maybe broken,

Let a Toyota dealder check the key (just check the key since it's free), said the key is working.

If I wang them to inscept the car , it's gonna take me 120 usd,

----------------------WOW----------------------------

Amazing things happened, the remote key start working a few days after changing the battery.

---------------------sigh--------------------------------

It quits working again this morning....

--------------questions--------------------------------

is it a switch inside the vechile that allow the remote key to open the door?

Should I pay the dealer to do a inspect? Or is it a simple problem that I can find out myself?

What is the worst case?. How much I will need to fix it?

Thanks in advanced!

P.s. Looking forward to the long weekends!!!