I have a 2004 Honda Odyssey. Yesterday, it starting having an issue where it would no longer start. The engine would not even crank, but there did not appear to be a battery or battery connection issue as lights, radio, et al still worked and did not seem to dim or be affected when key turned to crank/start position.
After some trial and error, checking battery cables, etc, I noticed that when the key was moved to the ON position, the D light on the transmission dash indicator remained lit for a few seconds and I could hear what sounded like a motor running or buzzing of some sort for about 2 seconds. Once that stops and the light goes off, then I can turn the key to the start/crank position and the engine will start fine.
It didn't do this until yesterday. What might be failing or going wrong?