Well aside from a dead battery, the switch in the key is not working anymore, or the sensor which unlock your vehicle is busted.

What happened in my car is the lock got stuck for some reason but there are no problems with the key or the actuator it self.

Air trapped in cooling system - bleed it. Is it running hot?
or
A/C drain clogged- clean it. Is the RH F floor wet?

Did it gurgle prior to the flushing? It's possible that is when air was introduced into the system. If it was recent, I'd take the car back there. They shouldn't charge you for a quick inspection of it.
Interesting article: http://www.2carpros.com/car_sounds/bubbling.htm

you are pushing a air bubble around

when i worked for lexus this was a real problem,on the is line. we used to raise the front end up and run eng. at about 3000 rpm with rad. cap off to try and burp all air out. sometimes it worked, sometimes it didnt. never heard of any harm done,may just have to live with it. turn radio up! lol

start by checking the fuses. possible just a blown fuse. If the fuses check out ok then you will have to start testing the climate control to find out if it is getting power to the control unit if it is then the climate control unit is probably bad

if you are doing your own elect. diag. then i strongly urge you to invest in a service manual from the dealer. it will pay for itself in the long run. good luck

you can get a new clip at any lexus or toyota dealer,and if you ask nicely they may even install it for free! its pretty common. Good Luck

bring it back to the dealer

A bad air mix control servo on the driver side. Try pressing the auto button and recirculate buttons down at the same time to activate the self test on the climate control display. Write down any two digit codes that display and re-post with them. Will look for your reply about 24 hours from now. Kevin

Could it be that the battery is partly discharged?

they come in kits that you have to wire the ballast to the existing circuit. There's all different companies that are manufacturing them right now. The kit is usually the 2 headlight assemblies then the two ballast and instructions for the conversion

Any tricks or things I should make sure to address to make sure the job is done correct and timely?

ck 90% window motor ck power is has power change window motor

is the a/c compressor kicking on and cycling after charging the system? If not the a/c compressor is probably the problem check it for power and ground when you have the a/c on at the connector if it is getting power then the a/c compressor is probably bad

You need an air conditioning clutch relay. Probability of success is 99%.

Call Lexus and see if the part #'s are the same. If you want the real answer with all the details, make it worth there while and bring a few regular coffees to the local Lexus parts dept. If you include some donuts you may even get to chat with a tech that might know.

I would call it the window control module, and it will be a dealer only item. I doubt there are any after markets for that. It could also just be the main switch check the connections aren't melted anywhere or dry and cracking.