2003 RX300 Mystery "Ticking Noise"

Probably mode actuator or mix actuator.

Remove glove box. Manipulate climate controls. Watch black box arms. Maybe take picture for parts guy.

The boys at the Lexus factory are not without self-interest. So they have perhaps installed a small ticker which is easily turned off by any official Lexus stealership. Perhaps you should try your friendly Lexus Stealership. Be sure to visit the bank and establish a large credit line before you go, of course. Oh yes - where do you live that you can find a Toyota stealership which will work on Lexus cars? They won't do that here!

My '99 RX 300 does the same thing. I believe it's the disk player... sounds like it's searching for something. Or maybe resetting a memory module? But it has been doing it for years.

Just do like the TV commercial guy... turn up the volume real loud and you won't hear it. Ya know, come to think of it, I don't remember hearing it at all when I got Lester Flatt and Earl Scruggs playing. That might be your answer. Just keep the CD blasting!!

Larry In the back yard, under the oak.

I think you meant its Homeland Security, and their tape got stuck

I believe I have heard this as well. Satmechs idea sounded pretty good since it does seem to emanate from the glovebox area. I thought it sounded like a spark or static from the right tweeter, but it might be mechanical switch contacts.