Hi I had this same problem in my 02 es300. To confirm it's the a/c relay you can swap it out with the horn relay. If the air then works that's your problem. Toyota wanted $130 for it at my local Florida dealer. I then purchased a used one on Amazon for $15. Has been fine for 2 years now. Another trick is to take out the relay, lay it in the palm of your hand and give it a couple of good whacks with the handle of a screw driver. I did that with mine and got another year out of it before failing for good. Good luck.