There is a button below the sunroof controls called "ACS". Does anyone know what it is for? There is no mention of it in the owner's manual and I have search this forum and googled it. Thanks for your help.
Sunroof controls? I've never seen a Gen1 (or Gen2) Prius with a factory sunroof. Maybe the aftermarket folks that installed the sunroof added the ACS button? Perhaps it's a ASC sunroof? ASC ELECTRIC SUNROOF INFORMATION PAGE
That is the Automatic Sunroof Control button. It's used to set the sunroof to automatically close when you turn off the vehicle.