OK, I just went out to the car again. Key in on position. I pushed the LED (which lights up when I push it) for 2-3 seconds, 3-4 seconds, 5-6 seconds. I noticed something else I hadn't before -- after letting go of the button, there's a very faint flash of the LED (just once).
I also noticed there was a clip loose on the part that connects the air box to the tube that goes across toward the back of the engine. Could this have been causing the problem? The light is still on; don't know if it stays on until reset, however.