Ive Been Thinking About How To Check It, And Ive Come Up With: Make Sure The Belt Is There. If The Belt Is On Then The Compressor Is Not Seized (other Wise It Would Burn The Belt Off). Also, When You Turn The Ac On (button), The Ac Compressor Clutch Should Engage (you Can Hear It Or You Can Visually See It Suck In). Thats Pretty Much All You Can Do. Some Compressors Wont Engage If There Is No Refrigerent In The System, I Dont Know About Honda. But Back To What You First Said: If The Light Is Flickering, Im Leaning Towards The Controler. There Really Isnt Much You Can Do In The Way Of Tests If You Dont Own The Vehicle Or Unless You Want To Throw Money At It