Phew... Big unknown is now OK. I had just one key with a car, which looked like master key (but no remote). According to eBay seller it was most likely master because there was no "security" light blink when I insert it. And yep, it was master.
So, I ordered 2 cut keys from here ($60 shipped)
I am sure it's been 100 times here on forums, but I will summarize in my words what's going on with programming/etc.
First of all - you need to order correct key. They should have correct chip for the year, etc, etc.
Once you have a key, you need to program 2 things:
1. CHIP for immobilizer (so key can start a car). To do that, you need to have MASTER key, otherwise no luck. I believe user
@Mauser can fix issue if you don't have master key, but that requires shipping module to him. In my case - I had master, and I have Techstream, took few minutes to program both new keys!
2. You need to program remote. To make sure buttons work on a key. Instructions I got from eBay seller didn't work (car wouldn't go into program mode). Instructions I found here on forum didn't work either. For my 2000 LX 470 following worked. And I found this on YouTube:
LOCK all doors (with a button to actually lock them)
OPEN Driver door
Insert key in and remove it
RUN LOCK switch on driver door 5 times (on/off)
CLOSE driver door
OPEN driver door
RUN LOCK switch on driver door 5 times (on/off)
KEY IN
TURN ON-OFF - 2x times
KEY OUT
---- AT THIS POINT - you should hear and see locks actuating meaning car is in "programming" mode. Other methods didn't do it.
Then you program as many keys by pressing Lock/Unlock button and holding for about 2 seconds, then pressing other button.
I got both keys working, really happy about that because I wasn't even sure if this car has remote system working..
But there is few issues which I need to figure out:
1. When I lock - locks "lazy" not always closing and I am not sure which one is bad, so car beeps, locks want to "close" but then spring back.
2. Remote only forks when key is outside of driver door. If I go behind a car, or next to passenger door - remote key doesn't work.
Will be posting separate topic with question about this if no one responds, but this feels like quick victory..
Now AC OTOH - I couldn't find anything in TechStream to read it (like temp sensor), so this one will need attention. Currently AC works only when I run it in COLD. Any other temperature - it blows hot air.